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19-0485; Rev 0; 4/96
Dual, Low-Dropout, 100mA Linear Regulators
_______________General Description
The MAX8865 and MAX8866 dual, low-dropout linear regulators operate from a +2.5V to +5.5V input range and deliver up to 100mA. At 200mA total load, the PMOS pass transistors keep the supply current at 145A, making these devices ideal for battery-operated portable equipment such as cellular phones, cordless phones, and modems. The devices feature Dual ModeTM operation: their output voltages are preset (at 3.15V for the "T" versions, 2.84V for the "S" versions, or 2.80V for the "R" versions) or can be adjusted with external resistor dividers. Other features include independent low-power shutdown, short-circuit protection, thermal shutdown protection, and reverse battery protection. The MAX8866 also includes an auto-discharge function, which actively discharges the selected output voltage to ground when the device is placed in shutdown mode. Both devices come in a miniature 8-pin MAX package.
____________________________Features
o Low Cost o Low, 55mV Dropout Voltage @ 50mA IOUT o Low, 105A No-Load Supply Current o Low, 145A Operating Supply Current (even in dropout) o Low, 350VRMS Output Noise o Independent, Low-Current Shutdown Control o Thermal Overload Protection o Output Current Limit o Reverse Battery Protection o Dual Mode Operation: Fixed or Adjustable (1.25V to 5.5V) Outputs
MAX8865T/S/R, MAX8866T/S/R
______________Ordering Information ________________________Applications
Cordless Telephones PCS Telephones Cellular Telephones PCMCIA Cards Modems Hand-Held Instruments Palmtop Computers Electronic Planners
PART MAX8865TEUA MAX8865SEUA MAX8865REUA MAX8866TEUA MAX8866SEUA MAX8866REUA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX PRESET VOUT (V) 3.15 2.84 2.80 3.15 2.84 2.80
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
OUT1 IN OUT2
OUTPUT VOLTAGE 1 OUTPUT VOLTAGE 2 COUT1 1F COUT2 1F
CIN 2F BATTERY
MAX8865 MAX8866
SHDN1 SHDN2 GND SET1 SET2
OUT1 1 IN 2 GND 3 OUT2 4
8
SET1 SHDN1 SHDN2 SET2
MAX8865 MAX8866
MAX
7 6 5
SHDN2
Dual Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Dual, Low-Dropout, 100mA Linear Regulators MAX8865T/S/R, MAX8866T/S/R
ABSOLUTE MAXIMUM RATINGS
VIN to GND ..................................................................-6V to +6V Output Short-Circuit Duration ............................................Infinite SET_ to GND ............................................................-0.3V to +6V SHDN_ to GND ............................................................-6V to +6V _ SHDN_ to IN .............................................................-6V to +0.3V _ OUT_ to GND...............................................-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70C) MAX (derate 4.1mW/C above +70C)......................330mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Thermal Resistance (JA)...............................................244C/W Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +3.6V, GND = 0V, TA = 0C to +85C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Voltage (Note 1) Output Voltage Adjustable Output Voltage Range (Note 2) Maximum Output Current Current Limit (Note 3) Ground Pin Current Dropout Voltage (Note 4) Line Regulation Load Regulation Output Voltage Noise SHUTDOWN SHDN Input Threshold SHDN Input Bias Current Shutdown Supply Current Shutdown to Output Discharge Delay (MAX8866) SET INPUT SET Reference Voltage (Note 2) SET Input Leakage Current (Note 2) THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis 2 VSET_ ISET_ VIH VIL I SHDN_ _ IQ SHDN V SHDN_ = VIN _ VOUT_ = 0V COUT = 1F, no load 0 0.16 1 2.0 0.4 1000 3000 V nA nA ms VLNR VLDR SYMBOL VIN VOUT_ 0mA IOUT 50mA, SET_ = GND MAX886_T MAX886_S MAX886_R CONDITIONS MIN 2.5 3.08 2.77 2.73 VSET_ 100 ILIM IQ SET_ = GND IOUT = 1mA IOUT = 50mA VIN = 2.5V to 5.5V, SET_ tied to OUT_, IOUT_ = 1mA IOUT_ = 0mA to 50mA 10Hz to 1MHz SET_ = GND SET_ tied to OUT_ COUT = 1F COUT = 100F -0.10 IOUT_ = 0mA IOUT_ = 50mA 220 105 145 1.1 55 0 0.012 0.006 350 220 270 TYP 3.15 2.84 2.80 MAX 5.5 3.24 2.91 2.87 5.5 UNITS V V
VOUT_
V mA mA A mV %/V %/mA VRMS
120 0.10 0.03
VIN = 2.5V to 5.5V, IOUT_ = 1mA VSET_ = 1.3V
1.222
1.25 0.015
1.276 50
V nA
TSHDN TSHDN
170 20
C C
_______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators
ELECTRICAL CHARACTERISTICS
(VIN = +3.6V, GND = 0V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 5) PARAMETER Input Voltage (Note 1) Output Voltage Adjustable Output Voltage Range (Note 2) Maximum Output Current Current Limit (Note 3) Ground Pin Current Dropout Voltage (Note 4) Line Regulation Load Regulation Output Voltage Noise SHUTDOWN SHDN Input Threshold SHDN Input Bias Current Shutdown Supply Current Shutdown to Output Discharge Delay (MAX8866) SET INPUT SET Reference Voltage (Note 2) SET Input Leakage Current (Note 2) THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis Note 1: Note 2: Note 3: Note 4: Note 5: TSHDN TSHDN 170 20 C C VSET_ ISET_ VIN = 2.5V to 5.5V, IOUT_ = 1mA VSET_ = 1.3V 1.207 1.25 0.015 1.288 50 V nA VIH VIL I SHDN_ _ IQ SHDN V SHDN_ = VIN _ VOUT_ = 0V COUT = 1F 0 0.16 1 2.0 0.4 1000 3000 V nA nA ms VLNR VLDR ILIM IQ SET_ = GND IOUT = 1mA IOUT = 50mA VIN = 2.5V to 5.5V, SET_ tied to OUT_, IOUT_ = 1mA IOUT_ = 0mA to 50mA 10Hz to 1MHz SET_ = GND SET_ tied to OUT_ COUT = 1F COUT = 100F -0.11 IOUT_ = 0mA IOUT_ = 50mA SYMBOL VIN VOUT_ 0mA IOUT 50mA, SET_ = GND MAX886_T MAX886_S MAX886_R VOUT_ CONDITIONS MIN 2.5 3.05 2.74 2.70 VSET_ 80 220 105 145 1.1 55 0 0.012 0.006 350 220 120 0.11 0.03 270 3.15 2.84 2.80 TYP MAX 5.5 3.26 2.93 2.89 5.5 V mA mA A mV %/V %/mA VRMS V UNITS V
MAX8865T/S/R, MAX8866T/S/R
Guaranteed by line regulation test. Adjustable mode only. Not tested. For design purposes, the current limit should be considered 120mA minimum to 320mA maximum. The dropout voltage is defined as (VIN_ - VOUT_) when VOUT_ is 100mV below the value of VOUT_ for VIN_ = VOUT_ +2V. Specifications to -40C are guaranteed by design and not production tested.
_______________________________________________________________________________________
3
Dual, Low-Dropout, 100mA Linear Regulators MAX8865T/S/R, MAX8866T/S/R
__________________________________________Typical Operating Characteristics
(VIN = +3.6V, CIN = 2F, COUT = 1F, SHDN2 = GND, MAX886_S, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8865/66-01
SUPPLY CURRENT vs. LOAD CURRENT
MAX8865/66-02
OUTPUT VOLTAGE vs. INPUT VOLTAGE
VOUT1 NO LOAD
MAX8865/66-03
3.00 VOUT1 2.95 OUTPUT VOLTAGE (V) 2.90 2.85 2.80 2.75 2.70 0
180 160 SUPPLY CURRENT (A) 140 120 100 80 60 SHDN2 = GND SHDN2 = VIN, ILOAD2 = 50mA
3.5 3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0
10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA)
0 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA)
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX8865/66-04
TOTAL SUPPLY CURRENT vs. INPUT VOLTAGE
MAX8865/66-05
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8865/66-06
100 90 SUPPLY CURRENT (A) 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6 INPUT VOLTAGE (V) ILOAD1 = 0mA ONE REGULATOR ENABLED, NO LOAD ILOAD1 = 50mA
200 180 SUPPLY CURRENT (A) 160 140 120 100 80 60 40 20 0 0 1 2 3 4 5 6 INPUT VOLTAGE (V) SHDN1 = SHDN2 = VIN ILOAD1 = ILOAD2 = 50mA ILOAD1 = ILOAD2 = 0mA
3.0
OUTPUT VOLTAGE (V)
2.9
2.8
2.7 -40 -20 0 20 40 60 80 TEMPERATURE (C)
SUPPLY CURRENT vs. TEMPERATURE
MAX8865/66-07
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8865/66-08
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
70 60 PSRR (dB) 50 40 30 COUT = 1F 20 10 0 COUT = 10F VOUT = 2.84V RL = 55
MAX8865/66-09
180 160 SUPPLY CURRENT (A) 140 120 100 80 60 -40 -20 0 20 40 60 SHDN2 = GND ILOAD1 = 50mA SHDN2 = VIN ILOAD1 = ILOAD2 = 50mA
140 120 DROPOUT VOLTAGE (mV) 100 80 60 40 20 0 TA = +85C
80
TA = +25C
TA = -40C
80
0
10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA)
0.01
0.10
TEMPERATURE (C)
1 10 100 FREQUENCY (kHz)
1000
4
_______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(VIN = +3.6V, CIN = 2F, COUT = 1F, SHDN2 = GND, MAX886_S, TA = +25C, unless otherwise noted.)
MAX8865T/S/R, MAX8866T/S/R
OUTPUT SPECTRAL NOISE DENSITY vs. FREQUENCY
OUTPUT SPECTRAL NOISE DENSITY (V/Hz)
MAX8865/66-10
REGION OF STABLE COUT ESR vs. LOAD CURRENT
COUT = 1F 100
MAX8865/66-11
10 RL = 55
1000
1
COUT ESR ()
COUT = 1F
10 INTERNAL FEEDBACK 1 EXTERNAL FEEDBACK 0.1 STABLE REGION
0.1
COUT = 100F
0.01 0.1 1 10 FREQUENCY (kHz) 100 1000
0.01 0 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA)
OUTPUT NOISE DC TO 1MHz
VOUT
1ms/div ILOAD = 50mA, VOUT IS AC COUPLED
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
4.6V VIN ILOAD 3.6V 2.84V VOUT 2.83V 2.82V
50mA 0mA 2.85V VOUT 2.84V 2.83V
50s/div ILOAD = 50mA, VOUT IS AC COUPLED
10s/div VIN = 3.60V, ILOAD = 0mA to 50mA, CIN = 10F, VOUT IS AC COUPLED
_______________________________________________________________________________________
5
Dual, Low-Dropout, 100mA Linear Regulators MAX8865T/S/R, MAX8866T/S/R
____________________________Typical Operating Characteristics (continued)
(VIN = +3.6V, CIN = 2F, COUT = 1F, SHDN2 = GND, MAX886_S, TA = +25C, unless otherwise noted.) LOAD-TRANSIENT RESPONSE LOAD-TRANSIENT RESPONSE
50mA ILOAD 0mA 2.85V VOUT 2.84V 2.83V ILOAD
50mA 0mA 2.85V VOUT 2.84V 2.83V
10s/div VIN = VOUT + 0.2V, ILOAD = 0mA to 50mA, CIN = 10F, VOUT IS AC COUPLED
10s/div VIN = VOUT + 0.1V, ILOAD = 0mA to 50mA, CIN = 10F, VOUT IS AC COUPLED
CROSSTALK DUE TO LOAD TRANSIENT
VOUT1 AC COUPLED (10mV/div) VOUT2 AC COUPLED (50mV/div) 100mA 0mA 20s/div CIN = 10F, IOUT1 = 100mA, SHDN2 = VIN
ILOAD2
MAX8866 SHUTDOWN (NO LOAD)
MAX8866 SHUTDOWN (50mA LOAD)
2V VSHDN 0V 4V VOUT 2V 0V
2V VSHDN 0V 4V VOUT 2V 0V
500s/div NO LOAD ILOAD = 50mA
500s/div
6
_______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators
______________________________________________________________Pin Description
PIN 1 2 3 4 NAME OUT1 IN GND OUT2 FUNCTION Regulator 1 Output. Fixed or adjustable from 1.25V to 5.5V. Sources up to 100mA. Bypass with a 1F capacitor to GND. Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 2F to GND. Ground. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. Regulator 2 Output. Fixed or adjustable from 1.25V to 5.5V. Sources up to 100mA. Bypass with a 1F capacitor to GND. Feedback Input for Setting the Output 2 Voltage. Connect to GND to set the output voltage to the preset 2.80V (MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T). Connect to an external resistor divider for adjustableoutput operation. Active-Low Shutdown 2 Input. A logic low turns off regulator 2. On the MAX8866, a logic low also causes the output voltage to discharge to GND. Connect to IN for normal operation. Active-Low Shutdown 1 Input. A logic low turns off regulator 1. On the MAX8866, a logic low also causes the output voltage to discharge to GND. Connect to IN for normal operation. Feedback Input for Setting the Output 1 Voltage. Connect to GND to set the output voltage to the preset 2.80V (MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T). Connect to an external resistor divider for adjustableoutput operation.
MAX8865T/S/R, MAX8866T/S/R
5
SET2
6 7
SHDN2 SHDN1
8
SET1
_______________Detailed Description
The MAX8865/MAX8866 are dual, low-dropout, low-quiescent-current linear regulators designed primarily for battery-powered applications. They supply adjustable 1.25V to 5.5V outputs or preselected 2.80V (MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T) outputs for load currents up to 100mA. As illustrated in Figure 1, these devices have a 1.25V reference and two independent linear regulators. Each linear regulator consists of an error amplifier, MOSFET driver, P-channel pass transistor, Dual ModeTM comparator, and internal feedback voltage divider. The 1.25V bandgap reference is connected to the error amplifiers' inverting inputs. Each error amplifier compares this reference with the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the P-channel pass transistor. If the feedback voltage is lower than the reference, the pass-transistor gate is pulled lower, allowing more current to pass and increasing the output voltage. If the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current to pass to the output. The output voltage is fed back through either an internal resistor voltage divider connected to the OUT_ pin, or an external resistor network connected to the SET_ pin. The Dual Mode comparator examines the SET_
voltage and selects the feedback path. If SET_ is below 60mV, internal feedback is used and the output voltage is regulated to 2.80V for the MAX886_R, 2.84V for the MAX886_S, or 3.15V for the MAX886_T. Both regulators are preset for the same voltage. The reference and the thermal sensor are shared between the regulators. Duplicate blocks exist for current limiters, reverse battery protection, and shutdown logic.
Internal P-Channel Pass Transistor
The MAX8865/MAX8866 feature 1.1 typical P-channel MOSFET pass transistors. This provides several advantages over similar designs using PNP pass transistors, including longer battery life. The P-channel MOSFET requires no base-drive current, which reduces quiescent current significantly. PNPbased regulators waste considerable amounts of current in dropout when the pass transistor saturates. They also use high base-drive currents under large loads. The MAX8865/MAX8866 do not suffer from these problems, and consume only 145A of quiescent current, whether in dropout, light load, or heavy load applications (see Typical Operating Characteristics).
Output Voltage Selection
The MAX8865/MAX8866 feature Dual Mode operation: they operate in either a preset voltage mode or an adjustable mode.
7
_______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators MAX8865T/S/R, MAX8866T/S/R
IN SHDN1
REVERSE BATTERY PROTECTION
ERROR AMP
MOS DRIVER WITH ILIMIT N
P
MAX8865 MAX8866
SHUTDOWN LOGIC
OUT1 SET1
*
THERMAL SENSOR 1.25V REF DUAL-MODE COMPARATOR 60mV
SHDN2
REVERSE BATTERY PROTECTION
ERROR AMP SHUTDOWN LOGIC
MOS DRIVER WITH ILIMIT N
P
OUT2
*
SET2
DUAL-MODE COMPARATOR GND * AUTO-DISCHARGE, MAX8866 ONLY
60mV
Figure 1. Functional Diagram
8
_______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators
off. When both sections are turned off, the reference and thermal shutdown are also turned off and the supply current is typically reduced to 0.16nA. Connect SHDN_ to IN for normal operation. The MAX8866 output _ voltages are actively discharged to ground when individual regulators are shut down (see Typical Operating Characteristics).
MAX8865T/S/R, MAX8866T/S/R
OUTPUT VOLTAGE IN OUT_
CIN 2F BATTERY
MAX8865 MAX8866
SHDN_ GND SET_
R1
20pF COUT 1F RL
Current Limit
The MAX8865/MAX8866 include a current limiter for each output section that monitors and controls the pass transistor's gate voltage, estimating the output current and limiting it to about 220mA. For design purposes, the current limit should be considered 120mA (min) to 320mA (max). The outputs can be shorted to ground for an indefinite time period without damaging the part.
R2
Figure 2. Adjustable Output Using External Feedback Resistors
Thermal Overload Protection
Thermal overload protection limits total power dissipation in the MAX8865/MAX8866. When the junction temperature exceeds TJ = +170C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistors and allowing the IC to cool. The thermal sensor will turn the pass transistors on again after the IC's junction temperature typically cools by 20C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to protect the MAX8865/MAX8866 in the event of fault conditions. Stressing the device with high load currents and high input-output differential voltages (which result in elevated die temperatures above +125C) may cause a momentary overshoot (2% to 8% for 200ms) when the load is completely removed. This can be remedied by raising the minimum load current from 0A (+125C) to 100A (+150C). For continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150C.
In preset voltage mode, internal, trimmed feedback resistors set the MAX886_R outputs to 2.80V, the MAX886_S outputs to 2.84V, and the MAX886_T outputs to 3.15V. Select this mode by connecting SET_ to ground. If SET_ can't be grounded in preset voltage mode, limit impedances between SET_ and ground to less than 100k. Otherwise, spurious conditions could cause the voltage at SET_ to exceed the 60mV Dual Mode threshold. In adjustable mode, select an output between 1.25V and 5.5V using two external resistors connected as a voltage divider to SET_ (Figure 2). The output voltage is set by the following equation: VOUT_ = VSET_ (1 + R1 / R2) where VSET_ = 1.25V. To simplify resistor selection: VOUT _ R1 = R2 - 1 VSET _ Choose R2 = 100k to optimize power consumption, accuracy, and high-frequency power-supply rejection. The total current through the external resistive feedback and load resistors should not be less than 10A. Since the VSET_ tolerance is typically less than 25mV, the output can be set using fixed resistors instead of trim pots. Connect a 10pF to 25pF capacitor across R1 to compensate for layout-induced parasitic capacitances.
Operating Region and Power Dissipation
Maximum power dissipation of the MAX8865/MAX8866 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipation across the device is P = IOUT (VIN VOUT). The resulting maximum power dissipation is: PMAX = (TJ - TA) / JA where (TJ - TA) is the temperature difference between the MAX8865/MAX8866 die junction and the surrounding air, and JA is the thermal resistance of the package to the surrounding air (244C/W).
Shutdown
A low input on a SHDN_ pin individually shuts down one _ of the two outputs. In shutdown mode, the selected pass transistor, control circuit, and all biases are turned
_______________________________________________________________________________________
9
Dual, Low-Dropout, 100mA Linear Regulators MAX8865T/S/R, MAX8866T/S/R
Reverse Battery Protection
The MAX8865/MAX8866 have a unique protection scheme that limits the reverse supply current to less than 1mA when either V IN or V SHDN_ falls below _ ground. The circuitry monitors the polarity of these pins, disconnecting the internal circuitry and parasitic diodes when the battery is reversed. This feature prevents the device from overheating and damaging the battery. (see the Power-Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics. When operating from sources other than batteries, improve supply-noise rejection and transient response by increasing the values of the input and output capacitors, and using passive filtering techniques (see the supply and load-transient responses in the Typical Operating Characteristics).
__________Applications Information
Capacitor Selection and Regulator Stability
Normally, use two 1F surface-mount ceramic capacitors on the input and a 1F surface-mount ceramic capacitor on each output of the MAX8865/MAX8866. Larger input capacitor values and lower ESR provide better supply-noise rejection and transient response. A higher-value input capacitor (10F) may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. Improve load-transient response, stability, and power-supply rejection by using large output capacitors. For stable operation over the full temperature range, with load currents of 100mA, a minimum of 1F is recommended (see the Region of Stable COUT ESR vs. Load Current graph in the Typical Operating Characteristics).
Load-Transient Considerations
The MAX8865/MAX8866 load-transient response graphs (see Typical Operating Characteristics) show two components of the output response: a DC shift of the output voltage due to the different load currents, and the transient response. Typical overshoot for step changes in the load current from 0mA to 50mA is 12mV. Increasing the output capacitor's value and decreasing its ESR attenuates transient spikes.
Cross-Regulation
Cross-regulation refers to the change in one output voltage when the load changes on the other output. For the MAX8865/MAX8866, cross-regulation for a 0mA to 50mA load change on one side results in less than 1mV change of output voltage. If the power dissipation on one output causes the junction temperature to exceed 125C, ensure regulation of the other output with a minimum load current of 100A.
Noise
The MAX8865/MAX8866 exhibit 350VRMS noise during normal operation. When using the MAX8865/MAX8866 in applications that include analog-to-digital converters of greater than 12 bits, consider the ADC's power-supply rejection specifications (see the Output Noise DC to 1MHz photo in the Typical Operating Characteristics).
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. Because the MAX8865/MAX8866 use P-channel MOSFET pass transistors, their dropout voltages are a function of RDS(ON) multiplied by the load currents (see Electrical Characteristics).
Power-Supply Rejection and Operation from Sources Other than Batteries
The MAX8865/MAX8866 are designed to deliver low dropout voltages and low quiescent currents in batterypowered systems. Power-supply rejection is 60dB at low frequencies and rolls off above 400Hz. As the frequency increases above 100kHz, the output capacitor is the major contributor to the rejection of power-supply noise
___________________Chip Information
TRANSISTOR COUNT: 259
10
______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators
________________________________________________________Package Information
DIM
C A 0.101mm 0.004 in B A1 L
MAX8865T/S/R, MAX8866T/S/R
e
A A1 B C D E e H L
INCHES MAX MIN 0.044 0.036 0.008 0.004 0.014 0.010 0.007 0.005 0.120 0.116 0.120 0.116 0.0256 0.198 0.188 0.026 0.016 6 0
MILLIMETERS MIN MAX 0.91 1.11 0.10 0.20 0.25 0.36 0.13 0.18 2.95 3.05 2.95 3.05 0.65 4.78 5.03 0.41 0.66 0 6
21-0036D
E
H
8-PIN MAX MICROMAX SMALL-OUTLINE PACKAGE
D
______________________________________________________________________________________
11
Dual, Low-Dropout, 100mA Linear Regulators MAX8865T/S/R, MAX8866T/S/R
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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