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Description
GM6156 is an efficient linear voltage regulator with ultralow - noise output, very low dropout voltage (typically 17mV at light loads and 165mV at 50mA), and very low ground current (600A at 100mA output). GM6156 provides better than 1% initial accuracy. Designed especially for hand-held, battery-powered devices, GM6156 includes a CMOS or TTL compatible enable/ shutdown control input. When shutdown, power consumption drops nearly to zero. Regulator ground current increases only slightly in dropout, further prolonging battery life. Key features of GM6156 include a reference bypass pin to improve its excellent low-noise performance, reversed-battery protection, current limiting, and overtemperature shutdown. The GM6156 is available in SOT-25 package.
Features
Very low noise output High output voltage accuracy Extremely accurate output voltage Guaranteed 150mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Reverse-battery protection "Zero" off-mode current Logic-controlled electronic enable
Application
Cellular telephones Laptop, notebook, and palmtop computers Battery-powered equipment PCMCIA VCC and VPP regulation/ switching Consumer/ personal electronics SMPS post-regulator/ dc-to-dc modules High-efficiency linear power supplies
TYPICAL APPLICATION CIRCUITS
GND BYP
3
4
CIN = 2.2F (tantalum)
VOUT
Low-Noise Operation: CBYP = 470pF, COUT Basic Operation: CBYP = not used, COUT
2.2F
1F
www.gammamicro.com
GM6156 V0.1
1
2
GM6156-3.3
Enable Shutdown
EN
1
5
VIN
MARKING INFORMATION & PIN CONFIGURATIONS (TOP VIEW)
SOT-25 (SOT-23-5)
VIN
5
SOT-25 (SOT-23-5)
VIN
5
VOUT
4
VOUT
4
Part Identification
XXVYW
1 2 3 1
XXVYW
2 3
EN GND BYP
EN GND ADJ
Fixed Voltages
Adjustable Voltage
XX V Y W
= Marking Code(JA = GM6156) = Voltage Code = Year = Weekly
ORDERING INFORMATION
Ordering Number
GM6156-AST25R GM6156-2.5ST25R GM6156-2.7ST25R GM6156-2.8ST25R GM6156-3.0ST25R GM6156-3.3ST25R GM6156-3.6ST25R GM6156-4.0ST25R GM6156-5.0ST25R
Output Voltage
Adj 2.5V 2.7V 2.8V 3.0V 3.3V 3.6V 4.0V 5.0V
Voltage Code A G T H J K L M Q
Package
SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25
Shipping
3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel
* For detail Ordering Number identification, please see last page.
PIN DESCRIPTION
Pin Number
1
Pin Name
EN GND BYP VOUT VIN
Function
Enable/ Shutdown(Input): COMS compatible input. Logic high = enable, logic low or open = shutdown. Ground Reference Bypass: Connect external 470pF capacitor to GND to reduce output noise. May be left open. Regulator Output Supply Input
GM6156
2 3 4 5
2
BLOCK DIAGRAM
VIN
IN BYP
OUT + + Bandgap Ref.
VOUT COUT
CBYP (Optional)
EN
Current Limit Thermal Shutdown
VIN GND
IN
OUT + ADJ + R1 R2 Bandgap Ref.
VOUT COUT
Figure 1. Ultra-Low-Noise Fixed Regulator
EN
Current Limit Thermal Shutdown
CBYP (Optional)
VOUT = VREF (1 + R2/ R1)
GND
Figure 2. Ultra-Low-Noise Adjustable Regulator
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Input Voltage Enable Input Voltage Power Dissipation (Note 3) Junction Temperature Lead Temperature (soldering, 5 seconds) Storage Temperature
Symbol
VIN VEN PD TJ TLEAD TS
Ratings
-20 ~ + 20 -20 ~ +20 Internally Limited -40 ~ +125 260 -60 ~ +150
Units
V V W C C C
OPERATING RATINGS
Parameter
Supply Input Voltage Enable Input Voltage Junction Temperature Thermal Resistance
Symbol
VIN VEN TJ
Ratings
+2.5 to +16 0 to VIN -40 ~ + 125 (Note 3)
Units
V V C C/ W
RqJA
GM6156
3
ELECTRICAL CHARACTERISTICS
(VIN = VOUT + 1V; IL = 100A; CL = 1.0F; VEN unless otherwise noted) 2.0; TJ = 25C, bold values indicate -40C TJ +125C;
Parameter
Output Voltage Accuracy Output Voltage Temperature Coefficient Line Regulation Load Regulation
Symbol
VO DVO/ DT DVO/ VO DVO/ VO
Test Condition
Variation from specified VOUT (Note 4) VIN = VOUT + 1V to 16V IL = 0.1mA to 150mA, (Note 5) IL = 100A IL = 50mA
Min
-1 -2
Typ
Max
1 2
Unit
% ppm/ C
40 0.004 0.02 10 110 140 165 0.01 80 350 600 1300 75 320 0.05 260 500 0.012 0.05 0.2/ 0.5 50 70 150 230 250 300 275 350 1 5 125 150 600 800 1000 1500 1900 2500
%/ V %/V
Dropout Voltage (Note 6)
VIN - VO
IL = 100mA IL = 150mA
mV
Quiescent Current
IGND
VEN VEN VEN
0.4V (shutdown) 0.18V (shutdown) 2.0V, IL = 0.1mA IL = 50mA
A
Ground Pin Current (Note 7)
IGND
IL = 100mA IL = 150mA
A
Ripple Rejection Current Limit Thermal Regulation Output Noise ENABLE Input Enable Input Logic-Low Voltage Enable Input Logic-High Voltage
PSRR ILIMT DVO/ DPD eNO
f = 100Hz, IL = 0.1mA VOUT = 0V (Note 8) IL = 50mA, CL = 2.2F, 470pF from BYP to GND
dB mA %/ W nV/ Hz
VIL VIH IIL
Regulator shutdown Regulator enabled VIL VIL VIH 0.4V 0.18V 2.0V 2 5 2.0 0.01
0.4 0.18
V V
-1 -2 20 25
A A
Enable Input Current IIH
GM6156
4
Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is PD(max) = (TJ(max) -TA) qJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. Note 4: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 6: Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Note 7: Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 8: Thermal regulation is defined as the change in output voltage at a time "t" after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 150mA load pulse at VIN = 16V for t = 10ms.
Applications Information Enable/ Shutdown
Forcing EN (enable/ shutdown) high (>2V) enables the regulator. EN is compatible with CMOS logic gates. If enable shutdown feature is not required, connect EN (pin 1) to IN (supply input, pin 5). See Figure 3.
Input Capacitor
A 1F capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input .
Reference Bypass Capacitor
BYP (reference bypass) is connected to the internal voltage reference. A 470pF capacitor (CBYP) connected from BYP to GND quiets this reference, providing a significant reduction in output noise. CBYP reduces the regulator phase margin. When using CBYP, output capacitors of 2.2F or greater are generally required to maintain stability. The start-up speed of GM6156 is inversely proportional to the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of CBYP. Likewise, if rapid turn-on is necessary, consider omitting CBYP. If output noise is not a major concern, omit CBYP and leave BYP open.
Output Capacitor
An output capacitor is required between OUT and GND to prevent oscillation. The minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1.0F minimum is recommended when CBYP is not used (see Figure 2). 2.2F minimum is recommended when CBYP is 470pF (see Figure 1). Larger values improve the regulator's transient response, the output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) of about 5W or less and a resonant frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/ or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since many aluminum electrolytics have electrolytes that freeze at about -30C, solid tantalums ate recommended for operation below -25C. At lower values for output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47F for current below 10mA or 0.33F for current below 1mA.
No-Load Stability
GM6156 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications.
Thermal Considerations
GM6156 is designed to provide 150mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
PD(max) =
(TJ(max) - TA) RqJA
GM6156
5
TJ(max) is the maximum junction temperature of the die, 125C, and TA is the ambient operating temperature. RqJA is layout dependent; Table 1 shows examples of junction-to-ambient thermal resistance for the GM6156.
Parameter
SOT-23-5
RqJA Recommended Minimum Footprint
220C/ W
RqJA 1" Square Copper Clad
170C/ W
RqJC
130C/ W
Table 1. SOT-25 Thermal Resistance
The actual power dissipation of the regulator circuit can be determined using by the equation:
PD = (VIN - VOUT) IOUT + VIN IGND
Substituting PD(max) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the GM6156 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: (125C - 25C)
PD(max) =
220C/W
PD(max) = 455mW
The junction-to-ambient thermal resistance for the minimum footprint is 220C/ W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 150mA, the maximum input voltage can be determined. From the Electrical Characteristics table, the maximum ground current for150mA output current is 2500 or 2.5mA.
455mW = (VIN - 3.3V) 150mA + VIN * 2.5mA 455mW = VIN * 150mA - 495mA + VIN * 2.5mA 950mW = VIN * 152.5mA VIN(max) = 6.23V
Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.2V in a SOT-25 package. For a full discussion of heat sinking and thermal effects on voltage regulators. Fixed Regulator Applications
Figure 3. Ultra-Low-Noise Fixed Voltage Application Figure 4. Low-Noise Fixed Voltage Application
GM6156
2 3 470pF
2 4 VOUT 2.2F BYP 3
GM6156
1
5
VIN
Enable Shutdown
EN
1
5
VIN
4
VOUT 1.0F
GM6156
Figure3 includes a 470pF capacitor for low-noise operation and shows EN (pin 3) connected to IN (pin 1) for an application where enable/ shutdown is not required. COUT = 2.2F minimum.
Figure 4 is an example of a low-noise configuration where CBYP is not required. C OUT = 1F minimum.
Adjustable Regulator Applications
The GM6156 can be adjusted to a specific output voltage by using two externa resistors (Figure 5). The resistors set the output voltage based on the following equation:
VOUT = 1.242V X (
R2 +1) R1
6
This equation is correct due to the configuration of the bandgap reference. The bandgap voltage is relative to the output, as seen in the block diagram. Traditional regulators normally have the reference voltage relative to ground and have a different VOUT equation. Resistor values are not critical because ADJ(adjust) has a high input impedance, but use resistors of 470kW or less for best results. A capacitor from ADJ to ground provides greatly improved noise performance.
1 2 3 5 VIN
GM6156
4
VOUT R1
470pF
R2
Figure 5. Ultra-Low- Noise Adjustable Voltage Application Figure 5 includes the optional 470pF noise bypass capacitor from ADJ to GND to reduce output noise. Dual-Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground.
Typical Characteristics
0 V = 6V IN VOUT = 5V -20
PSRR (dB)
0 V = 6V IN VOUT = 5V -20
PSRR (dB)
-40 -60 -80
-40 -60 -80 IOUT =100mA COUT = 2.2F CBYP = 0.01F 100 1k 10k 100k 1M 10M
FREQUENCY(Hz)
-100 10
IOUT =100mA COUT = 1F 100 1k 10k 100k 1M 10M
FREQUENCY(Hz)
-100 10
Figure 6. Power Supply Rejection Ratio
320 280
DROPOUT VOLTAGE (mV)
Figure 7. Power Supply Rejection Ratio
10
125C 1 25C -40C
NOISE (V/ Hz)
240 200 160 120 80 40 0 0 40 80 120 160
100mA 0.1 10mA 0.01 1mA
10k
100k
1M
10M
OUTPUT CURRENT (mA)
FREQUENCY(Hz)
Figure 8. Dropout Voltage vs. Output Current
Figure 9. Noise Performance
GM6156
7
VOUT=5V 0.001 COUT=10F electrolytic CBYP=10nF 0.0001 10 100 1k
SOT-25(SOT-23-5) PACKAGE OUTLINE DIMENSIONS
2.9 0.1 1.9 0.05 0.95 0.038 0.13
Pad Layout
0~0.1 1.5 0.05 2.8 0.1
0.094 2.4
0.028 0.7 0.039 1.0
0.65 0.05
0.35 0.03
0.8 0.05
0.037 0.95 0.037 0.95
5
5
0.074 1.9
( Inches ) mm
1.10 0.1
Unit: mm
ORDERING NUMBER
GM 6156 A ST25 R
Gamma Micro. Circuit Type Shipping R: Tape & Reel
GM6156
Output Voltage A: Adj, 2.5: 2.5V 2.7: 2.7V, 2.8: 2.8V 3.0: 3.0V, 3.3: 3.3V, 3.6: 3.6V, 4.0: 4.0V
Package ST25: SOT-25
8
9
GM6156

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