View MAX8869_30327.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1692; Rev 0; 8/00
1A, MicroCap, Low-Dropout, Linear Regulator
General Description
The MAX8869 low-dropout linear regulator operates from a +2.7V to +5.5V input and delivers a guaranteed 1A load current with a low 200mV dropout. The highaccuracy (1%) output voltage is preset at +5V, +3.3V, +2.5V, +1.8V, or +1.0V or is adjustable from +0.8V to +5V with an external resistor-divider. The MAX8869 uses MicroCapTM technology and requires only a small 1F output capacitor for guaranteed stability. An internal PMOS pass transistor allows low 500A supply current, making this regulator useful for networking and telecom hardware as well as battery-operated equipment. Other features include softstart, low-power shutdown, short-circuit protection, and thermal shutdown protection. The MAX8869 is available in a 1.5W, 16-pin TSSOP package, which is 30% smaller than a SOT223 and only 1.1mm high. o Guaranteed 1A Output Current o Stable with COUT = 1F o Low 200mV Dropout at 1A o 1% Output Voltage Accuracy Preset at +5V, +3.3V, +2.5V, +1.8V, or +1.0V and Adjustable from +0.8V to +5.0V o 54dB PSRR at 100kHz o Adjustable Soft-Start o 3ms Reset Output o Foldback Output Current Limit o Thermal Overload Protection o High-Power 16-Pin TSSOP Package (1.5W) 30% Smaller than SOT223 (only 1.1mm high)
Features
MAX8869
________________________Applications
Telecom Hardware Network Equipment Mobile Phone Base Stations Personal Computers Notebook Computers
PART MAX8869EUE50 MAX8869EUE33 MAX8869EUE25 MAX8869EUE18 MAX8869EUE10
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 16 TSSOP-EP** 16 TSSOP-EP 16 TSSOP-EP 16 TSSOP-EP 16 TSSOP-EP VOUT* (V) +5.0 +3.3 +2.5 +1.8 +1.0
MicroCap is a trademark of Maxim Integrated Products.
*Or adjustable from +0.8V to +5.0V. Contact factory for other preset output voltages. **EP = Exposed pad.
Pin Configuration Typical Operating Circuit
TOP VIEW
N.C. 1 16 N.C. 15 OUT 14 OUT
MAX8869 IN +2.7V TO +5.5V 1F ON OFF IN IN IN IN SHDN SS OUT OUT OUT OUT RST SET GND RESET OUTPUT OUT UP TO 1A 1F
IN 2 IN 3 IN 4 IN 5 RST 6 SHDN 7 SS 8
MAX8869
13 OUT 12 OUT 11 SET 10 GND 9 N.C.
TSSOP-EP
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
1A, MicroCap, Low-Dropout, Linear Regulator MAX8869
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, RST, SS to GND ......................................-0.3V to +6V OUT, SET to GND ........................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration ........................................Indefinite Continuous Power Dissipation (TA = +70C) 16-Pin TSSOP-EP (derate 19mW/C above +70C).........1.5W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range ...............................-65C to 150C Lead Temperature (soldering, 10s) .................................+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 = +2.7V or VOUT(NOM) + 0.5V (whichever is greater), SHDN = IN, SS = open, SET = GND, COUT = 1F, TA = 0C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Voltage Range Input Undervoltage Lockout Output Voltage Accuracy SET Regulation Voltage (Adjustable Mode) Line Regulation Load Regulation Adjustable Output Voltage Range Maximum Output Current Short-Circuit Current Limit In-Regulation Current Limit SET Dual Mode Threshold SET Input Bias Current Ground Current Dropout Voltage (Note 1) Output Voltage Noise Power-Supply Rejection Ratio Shutdown Supply Current SHDN Input Threshold SHDN Input Bias Current Soft-Start Charge Current RST Output Low Voltage IN Operating Voltage Range for RST Valid RST Leakage RST Trip Level Referred to Nominal VOUT RST Release Delay Thermal Shutdown Threshold TSHDN ISS PSRR IOFF VIH VIL ISET IGND VSET = +0.9V IOUT = 100A IOUT = 1A IOUT = 1mA, +2.7V < VIN < +5.5V IOUT = 1A, VOUT = +3.3V (Note 2) f = 10Hz to 1MHz, COUT = 1F, IOUT = 150mA f = 100kHz, COUT = 1F SHDN = GND, VIN = +5.5V, VOUT = 0 +2.7V < VIN < +5.5V SHDN = GND or IN VSS = 0 ISINK = 1mA ISINK = 10A V RST = +5.5V Falling edge, typical hysteresis = 10mV Rising edge Typical thermal hysteresis = +20C 89 1 1.0 0.01 92 3 170 1.6 0.6 0 6 0.1 5.5 1 95 5.5 0.1 VLNR VLDR IOUT ILIM ILIM SYMBOL VIN Typical hysteresis = 50mV IOUT = 1mA, TA = +85C IOUT = 150mA, TA = +85C VIN = VOUT + 0.5V to +5.5V, IOUT = 10mA IOUT = 1mA to 1A 0.8 Continuous VOUT = 0 VSET = 0.76V 1 1.0 2.0 40 1.9 4.0 80 50 0.5 2.5 0.2 200 150 54 0.1 10 350 120 300 2.0 CONDITIONS MIN 2.7 2.35 -1 792 800 0.1 0.8 1.5 5 2.45 TYP MAX 5.5 2.55 1 808 UNITS V V % mV %/V %/A V ARMS A A mV nA mA mV VRMS dB A V A A V V A % OUT ms
o
C
2
Dual Mode is a trademark of Maxim Integrated Products. _______________________________________________________________________________________
1A, MicroCap, Low-Dropout, Linear Regulator
ELECTRICAL CHARACTERISTICS
(VIN = +2.7V or VOUT(NOM) + 0.5V (whichever is greater), SHDN = IN, SS = open, SET = GND, COUT = 1F, TA = -40C to +85C, unless otherwise noted.) (Note 3)
PARAMETER Input Voltage Range Input Undervoltage Lockout Output Voltage Accuracy SET Regulation Voltage (Adjustable Mode) Load Regulation Adjustable Output Voltage Range Maximum Output Current Short-Circuit Current Limit In-Regulation Current Limit SET Dual Mode Threshold SET Input Bias Current Ground Current Dropout Voltage (Note 1) Shutdown Supply Current SHDN Input Threshold SHDN Input Bias Current RST Output Low Voltage IN Operating Voltage Range for RST Valid RST Leakage RST Trip Level Referred to Nominal VOUT RST Release Delay IOFF VIH VIL ISET IGND VSET = +0.9V IOUT = 100A IOUT = 1A, VOUT = +3.3V (Note 2) SHDN = GND, VIN = +5.5V, VOUT = 0 +2.7V < VIN < +5.5V SHDN = GND or IN ISINK = 1mA ISINK = 10A V RST = +5.5V Falling edge, typical hysteresis = 10mV Rising edge 88 1 1.0 1.7 0.6 0.1 0.1 5.5 1 95 6 IOUT ILIM ILIM Continuous VOUT = 0 VSET = +0.76V VLDR SYMBOL VIN Typical hysteresis = 50mV IOUT = 1mA, TA = +85C IOUT = 150mA, TA = +85C IOUT = 1mA to 1A 0.8 1 1.0 2.0 40 120 300 2.0 350 10 CONDITIONS MIN 2.7 2.3 -1 792 MAX 5.5 2.6 1 808 2.0 5 UNITS V V % mV %/A V ARMS A A mV nA mA mV A V A V V A % OUT ms
MAX8869
Note 1: Dropout voltage is (VIN - VOUT) when VOUT falls to 100mV below the value of VOUT measured when VIN = VOUT(NOM) +0.5V. Since the minimum input voltage is 2.7V, this specification is only meaningful when VOUT 2.7V. Note 2: The output voltage is externally set using a resistive voltage-divider from OUT to SET. Note 3: Specifications to -40C are guaranteed by design, not production tested.
_______________________________________________________________________________________
3
1A, MicroCap, Low-Dropout, Linear Regulator MAX8869
Typical Operating Characteristics
(VIN = +5V, VOUT = +2.5V, SHDN = IN, SS = open, COUT = 1F, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE DEVIATION vs. OUTPUT CURRENT
MAX8869-01
OUTPUT VOLTAGE DEVIATION vs. TEMPERATURE
MAX8869-02
GROUND CURRENT vs. INPUT VOLTAGE
IOUT = 1A IOUT = 0.5A
MAX8869-03
0 OUTPUT VOLTAGE DEVIATION (%) -0.5 VIN = +5V -1.0 -1.5 -2.0 -2.5 -3.0 0 0.5 1.0 1.5 2.0 2.5 VIN = +3V
1.5 IOUT = 250mA OUTPUT VOLTAGE DEVIATION (%) 1.0 0.5 0 -0.5 -1.0 -1.5
3.5 3.0 GROUND CURRENT (mA) 2.5 2.0 1.5 1.0 0.5 0 IOUT = 0
3.0
-40
-15
10
35
60
85
0
1
2
3
4
5
OUTPUT CURRENT (A)
TEMPERATURE (C)
INPUT VOLTAGE (V)
GROUND CURRENT vs. OUTPUT CURRENT
MAX8869-04
GROUND CURRENT vs. TEMPERATURE
MAX8869-05
DROPOUT VOLTAGE vs. OUTPUT CURRENT
VOUT = +3.3V 400 DROPOUT VOLTAGE (mV) 350 300 250 200 150 100 50
MAX8869-06
3.5 3.0 GROUND CURRENT (mA) 2.5 2.0 1.5 1.0 0.5 0 0 200 400 600 800 VIN = +3V VIN = +5V
2.5
450
GROUND CURRENT (mA)
2.0
IOUT = 250mA
1.5 VIN = +5V 1.0 IOUT = 0 VIN = +3V
0.5
0 1000 -40 -15 10 35 60 85 OUTPUT CURRENT (mA) TEMPERATURE (C)
0 0 250 500 750 1000 1250 1500 OUTPUT CURRENT (mA)
DROPOUT VOLTAGE vs. INPUT VOLTAGE
MAX8869-07
PSRR vs. FREQUENCY
MAX8869-08
OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY
IOUT = 250mA
MAX8869-09
300 250 DROPOUT VOLTAGE (mV) 200 150 100 50 0
IOUT = 500mA IN DROPOUT, VOUT VIN
10
60 50 PSRR (dB) 40 30 20 10 0 IOUT = 300mA 0.01 0.1 1 10 100
NOISE (V/Hz) 1000
1
0.1
0.01 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) FREQUENCY (kHz)
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
4
_______________________________________________________________________________________
1A, MicroCap, Low-Dropout, Linear Regulator MAX8869
Typical Operating Characteristics (continued)
(VIN = +5V, VOUT = +2.5V, SHDN = IN, SS = open, COUT = 1F, TA = +25C, unless otherwise noted.)
OUTPUT NOISE vs. OUTPUT CURRENT
160 OUTPUT NOISE (VRMS) 140 120 100 80 60 40 20 0 0.001 0.01 0.1 1 VOUT
MAX8869-10
LINE-TRANSIENT RESPONSE
MAX8869-11
LOAD-TRANSIENT RESPONSE
MAX8869-12
180
5V VIN 3.6V IOUT
1A 100mA
VOUT 10mV/div AC-COUPLED IOUT = 250mA 200s/div 20s/div
50mV/div AC-COUPLED
OUTPUT CURRENT (A)
LOAD-TRANSIENT RESPONSE
MAX8869-13
OUTPUT NOISE
MAX8869-14
SHUTDOWN RESPONSE
MAX8869-15
1MHz BANDWIDTH 3A IOUT 10mA VSHDN 100V/div VOUT 200mV/div AC-COUPLED VOUT
IOUT = 100A
5V/div
2V/div
20s/div
4ms/div
40s/div
SOFT-START RESPONSE
MAX8869-16
RESET OUTPUT RESPONSE
MAX8869-17
VSHDN
5V/div
VIN
5V/div
1A/div IIN VOUT 2V/div RST OUTPUT DELAY 2V/div
VOUT CSS = 100nF 10ms/div
2V/div
RST
1ms/div
_______________________________________________________________________________________
5
1A, MicroCap, Low-Dropout, Linear Regulator MAX8869
Pin Description
PIN 1, 9, 16 NAME N.C. No Connection. Not internally connected. Regulator Input. Connect to power source (+2.7V to +5.5V). Bypass with 1F or greater capacitor to GND (see Capacitor Selection and Regulator Stability). Connect all IN pins together for proper operation. Reset Output. Open-drain output is low when VOUT is 8% below its nominal value. RST remains low while the output voltage (VOUT) is below the reset threshold and for at least 3ms after VOUT rises to within regulation. Connect a 100k pullup resistor to OUT to obtain an output voltage. Active-Low Shutdown Input. A logic low reduces the supply current to 0.1A. Connect SHDN to IN for normal operation. In shutdown, RST is low and the soft-start capacitor discharges. Soft-Start Control Pin. Connect a soft-start capacitor from SS to GND (see Soft-Start Capacitor Selection). Leave SS open to disable soft-start. Ground. This pin and the exposed pad also function as a heatsink. Solder both to a large pad or to the circuit-board ground plane to maximize power dissipation. Voltage-Setting Input. Connect SET to GND for factory-preset output voltage. Connect SET to an external resistor-divider for adjustable output operation. Regulator Output. Bypass with a 1F or greater low-ESR capacitor to GND (see Capacitor Selection and Regulator Stability). Connect all OUT pins together for proper operation. FUNCTION
2, 3, 4, 5
IN
6
RST
7 8 10 11 12, 13, 14, 15
SHDN SS GND SET OUT
Detailed Description
The MAX8869 features Dual Mode operation, allowing a fixed output of +5V, +3.3V, +2.5V, +1.8V, or +1.0V, or adjustable output from +0.8V to +5.0V. The regulators are guaranteed to supply 1A of continuous output current with only 1F of output capacitance. As shown in the functional diagram (Figure 1), the device has a 0.8V reference, error amplifier, MOSFET driver, P-channel pass transistor, internal feedback voltage-divider, soft-start function, reset timer, and Dual Mode and low VOUT comparators. The 0.8V reference is connected to the error amplifier's inverting input. The 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 transistor. If the feedback voltage is high, the pass transistor's gate is pulled up, allowing less current to pass to the output. The low VOUT comparator senses when
the feedback voltage has dropped 8% below its expected level, causing RST to go low. The output voltage is fed back through either an internal resistor-divider connected to OUT or an external resistor network connected to SET. The Dual Mode comparator examines VSET and selects the feedback path. If VSET is below 80mV, the internal feedback path is used and the output voltage is regulated to the factory-preset voltage. Otherwise, the output voltage is set with the external resistor-divider.
Internal P-Channel Pass Transistor
The MAX8869 features a 1A P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNP-based regulators also waste considerable current in dropout when the pass transistor saturates and use high base-drive currents under large loads. The MAX8869 does not suffer from these problems and consumes only 500A of quiescent current even in dropout.
6
_______________________________________________________________________________________
1A, MicroCap, Low-Dropout, Linear Regulator MAX8869
IN SHUTDOWN THERMAL SENSOR ERROR AMP SHUTDOWN LOGIC MOSFET DRIVER WITH FOLDBACK CURRENT LIMIT VSS OUT 92% VOUT DETECTOR IN 736mV 3ms 0.8V REFERENCE SET 6A 80mV R2 R1 OUT NMOS
MAX8869
PMOS
SHDN
DELAY TIMER RST
SS
VSS
DUAL MODE COMPARATOR
GND
Figure 1. Functional Diagram
where VSET = +0.8V. To simplify resistor selection:
MAX8869 IN IN IN CIN 1F ON OFF CSS IN IN SHDN SS OUT OUT OUT OUT RST SET GND RESET OUTPUT COUT 1F OUT
R1 = R2 (VOUT / VSET - 1) Since the input bias current at SET is nominally 50nA, large resistance values can be used for R1 and R2 to minimize power consumption without losing efficiency. Up to 80k is acceptable for R2. In preset voltage mode, the impedance between SET and ground should be less than 10k. Otherwise, spurious conditions could cause the voltage at SET to exceed the 80mV Dual Mode threshold.
Shutdown
Figure 2. Typical Operating Circuit with Preset Output Voltage
Output Voltage Selection
The MAX8869 features Dual Mode operation. Connect SET to GND (Figure 2) for preset voltage mode (see Ordering Information). In adjustable mode, set the output between +0.8V to +5.0V through two external resistors connected as a voltage-divider to SET (Figure 3). The output voltage is set by the following equation: VOUT = VSET (1 + R1 / R2)
A logic low on SHDN disables the MAX8869. In shutdown, the pass transistor, control circuitry, reference, and all biases are turned off, reducing supply current to typically 0.1A. Connect SHDN to IN for normal operation. In shutdown, RST is low and the soft-start capacitor is discharged.
RST Comparator
The MAX8869 features a low V OUT indicator that asserts when the output voltage falls out of regulation. The open-drain RST goes low when OUT falls 8%
7
_______________________________________________________________________________________
1A, MicroCap, Low-Dropout, Linear Regulator MAX8869
MAX8869 IN IN IN CIN 1F ON OFF IN IN SHDN SS GND R2 OUT OUT OUT OUT RST SET CSS R1 COUT 1F OUT IN CIN 1F ON OFF RSS IN IN IN IN SHDN SS OUT OUT OUT OUT RST SET GND RESET OUTPUT COUT 1F OUT MAX8869
RESET OUTPUT
Figure 3. Typical Operating Circuit with Adjustable Output Voltage
Figure 4. Typical Operating Circuit with Soft-Start and CurrentLimit Reduction
below its nominal output voltage. RST remains low for 3ms after OUT has returned to its nominal value. A 100k pullup resistor from RST to a suitable logic supply voltage (typically OUT) provides a logic control signal. RST can be used as a power-on-reset signal to a microcontroller (C) or can drive an external LED for indicating a power failure. RST is low during shutdown. RST remains valid for an input voltage as low as 1V.
Soft-Start
As shown in Figure 4, a capacitor on SS allows a gradual buildup of the MAX8869 output, reducing the initial in-rush current peaks at startup. When SHDN is driven low, the soft-start capacitor is discharged. When SHDN is driven high or power is applied to the device, a constant 6A current charges the soft-start capacitor. The resulting linear ramp voltage on SS increases the current-limit comparator threshold, limiting the P-channel gate drive (see Soft-Start Capacitor Selection). Leave SS floating to disable the soft-start feature.
tying a resistor (RSS) between SS and GND, so that ILIM = ILIM_NOM (ISS RSS / 1.25) where ISS = 6A . With RSS in place, soft-start can still be achieved by placing a capacitor (CSS) in parallel with RSS. The output current now ramps up asymptotically to the reduced current limit rather than the nominal one, increasing the softstart time. The time required for the current limit to reach 90% of its steady-state value is given by tSS = 2.3 RSSCSS.
Thermal Overload Protection
Thermal overload protection limits total power dissipation in the MAX8869. When the junction temperature exceeds TJ = +170C, the thermal sensor turns off the pass transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on once the IC's junction temperature drops approximately 20C. Continuous short-circuit conditions will consequently result in a pulsed output. Thermal overload protection is designed to safeguard the MAX8869 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150C.
Current Limiting
The MAX8869 features a 4A current limit when the output voltage is in regulation. When the output voltage drops by 8% below its nominal, the current limit folds back to 1.7A. The output can be shorted to ground for an indefinite period of time without damaging the device. Avoid continuous output current of more than 1A to prevent damage. Both the in-regulation and short-circuit current limits can be reduced from their nominal values by reducing the voltage at the soft-start pin (SS) below 1.25V. The current limits scale proportionately with the voltage by ILIM = ILIM_NOM (VSS / 1.25). Since the SS pin sources a nominal 6A current, the current limit can be set by
8
Operating Region and Power Dissipation
Maximum power dissipation of the MAX8869 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(MAX) - TA) / (JC + CA)] where (T J(MAX) - T A ) is the temperature difference between the maximum allowed die junction (150C) and the surrounding air; JC (junction to case) is the
_______________________________________________________________________________________
1A, MicroCap, Low-Dropout, Linear Regulator
1.2 MAXIMUM CONTINUOUS CURRENT MAXIMUM OUTPUT CURRENT (A) 1.0 TYPICAL DROPOUT VOLTAGE LIMIT 0.8 0.6 0.4 0.2 TJ = +150C 0 0 1 2 3 4 5 INPUT-OUTPUT DIFFERENTIAL VOLTAGE TYPICAL SUPPLY VOLTAGE LIMIT TA = +25C
TA = +50C TA = +70C
SRF and ESR of 60m or less to ensure stability and optimum transient response. This is particularly true in applications with very low output voltage (<2V) and high output current (>0.5A). Since some capacitor dielectrics may vary over bias voltage and temperature, consult the capacitor manufacturer specifications to ensure that the capacitors meet these requirements over all voltage and temperature conditions used.
MAX8869
Soft-Start Capacitor Selection
A capacitor (CSS) connected from SS to GND causes the MAX8869 output current to slowly rise during startup, reducing stress on the input supply. The rise time to full current limit (tSS) is determined by: tSS = 2.08 10-4 CSS where CSS is in nF. Typical capacitor values between 10nF to 100nF, with a 5V rating, are sufficient. Because this ramp is applied to the current-limit comparator, the actual time for the output voltage to ramp up depends on the load current and output capacitor. Leave SS open to disable soft-start.
Figure 5. Power Operating Region: Maximum Output Current vs. Input-Output Differential Voltage
thermal resistance of the package chosen, and CA is the thermal resistance from the case through the PC board, copper traces, and other materials to the surrounding air. Figure 5 shows the allowable power dissipation for typical PC boards at +25C, +50C, and +70C ambient temperatures. The MAX8869 TSSOP-EP package features an exposed thermal pad on its underside. This pad lowers the package's thermal resistance by providing a direct thermal heat path from the die to the PC board. Additionally, the ground pin (GND) also channels heat. Connect the exposed thermal pad and GND to circuit ground by using a large pad (1in2 minimum recommended) or multiple vias to the ground plane.
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Since a 0.2 P-channel MOSFET is used as the pass device, dropout voltage is the product of RDS(ON) and load current (see Electrical Characteristics and Dropout Voltage vs. Output Current in Typical Operating Characteristics). The MAX8869 operating current remains low in dropout.
Applications Information
Capacitor Selection and Regulator Stability
Capacitors are required at the MAX8869 input and output. Connect 1F or greater capacitors between IN and GND (C IN ) and OUT and GND (C OUT ). Due to the MAX8869's relatively high bandwidth, use only surfacemount ceramic capacitors that have low equivalent series resistance (ESR) and high self-resonant frequency (SRF). Make the input and output traces at least 2.5mm wide (the width of the four parallel pins), and connect CIN and COUT within 6mm of the IC to minimize the impact of PC board trace inductance. The width of the ground trace should be maximized underneath the IC to ensure a good connection between pin 10 (GND) and the ground side of the capacitors. The output capacitor's ESR and SRF can affect stability and output noise. Use capacitors with greater than 5MHz
Noise, PSRR, and Transient Response
The MAX8869 is designed to achieve low dropout voltage and low quiescent current in battery-powered systems while still maintaining good noise, transient response, and AC rejection (see PSRR vs. Frequency in the Typical Operating Characteristics). When operating from very noisy sources, supply noise rejection and transient response can be improved by increasing the values of the input and output capacitors and employing passive postfiltering. MAX8869 output noise is typically 150V RMS. (see the Output Noise plot in the Typical Operating Characteristics).
Chip Information
TRANSISTOR COUNT: 1088
_______________________________________________________________________________________
9
1A, MicroCap, Low-Dropout, Linear Regulator MAX8869
Package Information
TSSOP.EPS
Note: The MAX8869EUE has an exposed thermal pad on the bottom side of the package.
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX8869

	To Download MAX8869 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .