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Global Mixed-mode Technology Inc.
G954
2A Low Dropout Regulator
Features
Fixed Output Voltage 1.2V, 1.5V, 1.8V and 2.5V Over Current and Over Temperature Protection Output Current 2A TO-263 & TO-263T Package
General Description
The G954 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 2 Amps. Since it has superior dropout characteristics compared with regular LDOs, it can be used to supply 2.5V on motherboards or 1.5V, 1.8V on peripheral cards from the power supply thus allowing the elimination of costly heatsinks. The G954 provides excellent regulation over variations in line, load and temperature. It provides over current and over temperature protection functions. The G954 is available with 1.2V, 1.5V, 1.8V, 2.5V and adjustable outputs in TO-263 & TO-263T package.
Applications
Battery Powered Systems Motherboards Peripheral Cards Network Cards Set Top Boxes Notebook Computers
ORDER NUMBER
G954-12T55U G954-15T55U G954-18T55U G954-25T55U G954-12TU5U G954-15TU5U G954-18TU5U G954-25TU5U Note: T5: TO-263 5: Bonding Code U: Tape & Reel
MARKING
G954-12 G954-15 G954-18 G954-25 G954-12 G954-15 G954-18 G954-25 TU: TO-263T
VOLTAGE
1.2V 1.5V 1.8V 2.5V 1.2V 1.5V 1.8V 2.5V
TEMP. RANGE
-40C ~ +85C -40C ~ +85C -40C ~ +85C -40C ~ +85C -40C ~ +85C -40C ~ +85C -40C ~ +85C -40C ~ +85C
PACKAGE (Pb free)
TO-263 TO-263 TO-263 TO-263 TO-263T TO-263T TO-263T TO-263T
Pin Configuration
Typical Application Circuit
VIN
VO
Top View
1 2 3 220F
G954
220F
VIN GND VO TO-263/TO-263T
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
(Note 1) Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Power Dissipation Internally Limited (Note 2) Maximum Junction Temperature. . . . . . . . . . . . 150C Storage Temperature Range. . . . -65C TJ +150C Reflow Temperature (soldering, 10sec) . . . . . .260C Thermal Resistance Junction to Ambient, (JA) TO-263T(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . .80C/W Thermal Resistance Junction to Case, (Jc) TO-263T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8C/W ESD Rating (Human Body Model) . . . . . . . . . . . . 2kV
Note (1): See Recommended Minimum Footprint
G954
Absolute Maximum Ratings
Operation Conditions (Note 1) Input Voltage . . . . . . . . . . . . . . . . . . . . . . . 2.2V ~5.5V Temperature Range . . . . . . . . . . . .-40C TA +85C
Electrical Characteristics
VIN = 5V, IO = 0.5A, CIN = COUT = 220F, TA = TJ = 25C unless otherwise specified (Note 3) PARAMETER
Supply Voltage Output Voltage Line Regulation
SYMBOL
VIN VO
CONDITION
VIN = VO +0.7V, IO = 10mA VO+0.7V < VIN < 5.5V, IO = 10mA G954-12 VIN = 2.5V, 10mA < IOUT < 2A G954-15 VIN = 2.5V, 10mA < IOUT < 2A G954-18 VIN = 3.8V, 10mA < IOUT < 2A G954-25 VIN = 5V, 10mA < IOUT < 2A VIN = 5V fi = 120Hz, 1VP-P, IO = 100mA G954-15 VOUT = 2%, IOUT = 2A G954-18 VOUT = 2%, IOUT = 2A G954-25 VOUT = 2%, IOUT = 2A
MIN
2.2 -2 ---
TYP
--VO 0.2
MAX
5.5 2 2
UNIT
V % %
Load Regulation
---
1
2
%
Quiescent Current Ripple Rejection Dropout Voltage Short Circuit Current Over Temperature
IQ
VD
---------------
2.7 55 0.9 0.7 0.5 1 150
4.5 --1.1 0.9 0.7 -----
mA dB V A C
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which the device functions but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical Characteristics. Note2: The maximum power dissipation is a function of the maximum junction temperature, TJmax ; total thermal resistance, JA, and ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is (Tjmax-TA) / JA. If this dissipation is exceeded, the die temperature will rise above 150C and IC will go into thermal shutdown. Note3: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Definitions
Dropout Voltage The input/output voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 2% below its nominal value, dropout voltage is affected by junction temperature, load current and minimum input supply requirements. Line Regulation The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected.
G954
Load Regulation The change in output voltage for a change in load current at constant chip temperature. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected. Maximum Power Dissipation The maximum total device dissipation for which the regulator will operate within specifications. Quiescent Bias Current Current which is used to operate the regulator chip and is not delivered to the load.
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
ViN-VOUT =3V, CIN = 220F, COUT =220F, TA = 25C, unless otherwise noted.
G954
Short Circuit Current
Line Transient Response
Ripple Rejection
70 60
Ripple Rejection (dB)
G954-18 Overcurrent Protection Characteristics
50 40 30 20 10 0
10 100 1000 10000
IL=1A IL=2A
100000
1000000
Frequency (Hz)
G954-18-Start-up
G954-18-Start-up
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Max. Power Dissipation vs. PCB Top Copper Area
4.5 4
Max. Dissipation Power (W) Max. Dissipation Power (W)
G954
Max. Power Dissipation vs. TAMB
Unit : In2
A=0.5 A=1.0 A=1.5
4.5 4 3.5 3
3.5 3 2.5 2 1.5 1 0.5 0 0.5 1.5 2.5 3.5 4.5 PCB Top Copper Area (in2)
A=2.0
2.5 2 1.5 1 0.5 0 25 35 45 55 65 TAMB (C) 75 85
A=2.5 A=3.0 A=3.5 A=4.0 A=4.5 A=5.0
G954-18 Quiescent Current vs. Temperature
3.0
1.4 IL=10mA
Quiescent Current (mA)
G954-18 Dropout Voltage vs. IL
2.5
Dropout Voltage (V)
1.2 1.0 0.8 0.6 0.4
2.0
1.5
VIN=4V VIN=5V
0.2 0.0
TA=-25C 1 1.2 1.4
TA=25C
TA=85C
1.0 -25 -15 -5 5 15 25 35 45 55 65 75 85 Temperature (C)
1.6 IL (A)
1.8
2
G954-18 Output Voltage vs. Temperature
1.825 IL=10mA
Output Voltage (V)
G954-18 Output Voltage vs. IL
1.824 1.814 1.804 1.794 1.784 1.774 1.764 VIN=4V VIN=5V
1.820
Output Voltage (V)
1.815
1.810 IL=4A 1.805
IL=5A
TA=25C
1.800 5 15 25 35 45 55 Temperature (C) 65 75 85
0
0.5
1
1.5
2
IL (A)
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G954-25 Quiescent Current vs. Temperature
3.50 1000 900 3.00
Quiescent Current (mA) Dropout Voltage (mV)
G954
G954-25 Dropout Voltage vs. IL
800 700 600 500 400 300 200 100 TA=-25C
TA=85C
2.50
2.00 VIN=5V 1.50 VIN=6V
TA=25C
1.00 -25 -15 -5 5 15 25 35 45 55 65 75 85 Temperature (C)
0 1 1.2 1.4 IL (A) 1.6 1.8 2
G954-25 Output Voltage vs. Temperature
2.55 2.59 2.57
Output Voltage (V)
G954-25 Output Voltage vs. IL
2.54 2.53
Output Voltage (V)
TA=25C
2.55 2.53 2.51 2.49 2.47 2.45 -25 -5 15 35 55 75 Temperature (C) IL=10mA VIN=4V VIN=5V
2.52 2.51 2.5 2.49 2.48 2.47 2.46 2.45 0 0.5 1 IL (A) 1.5 2 VIN=4V VIN=5V
Recommended Minimum Footprint
TO-263 TO-263T
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
Package Information
D c1 A
G954
B
V L3 E b1 L A1
L1 b L2
e e1 c
TO-263 (T5) Package
SYMBOL
A A1 B b b1 c c1 D E e e1 L L1 L2 L3 V
MILLIMETER MIN
4.470 0.000 1.170 0.710 1.170 0.310 1.170 10.010 8.500 2.540 TYP 4.980 15.050 5.080 2.340 1.300 5.600 REF 5.180 15.450 5.480 2.740 1.700 0.196 0.593 0.200 0.092 0.051
INCH MAX
4.670 0.150 1.370 0.910 1.370 0.530 1.370 10.310 8.900
MIN
0.176 0.000 0.046 0.028 0.046 0.012 0.046 0.394 0.335 0.100 TYP
MAX
0.184 0.006 0.054 0.036 0.054 0.021 0.054 0.406 0.350 0.204 0.608 0.216 0.108 0.067 0.220 REF
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
7
Global Mixed-mode Technology Inc.
D1 B A c1
G954
E
V L
L1
L3 L2 b e e1 c
TO-263T (TU) Package
SYMBOL
A B b c c1 D E e e1 L L1 L2 L3 V
DIMENSIONS IN MILLIMETER MIN NOM
1.750 0.880 1.255 0.381 0.356 9.660 8.380 --------13.74 ----2.290 --------2.000 1.280 1.295 0.406 0.406 10.160 8.680 2.540 5.080 14.240 4.280 2.540 ----7.280
DIMENSIONS IN INCH MAX
2.250 1.680 1.335 0.431 0.456 10.660 8.980 --------14.740 ----2.790 1.778 -----
MIN
0.069 0.345 0.049 0.015 0.014 0.380 0.330 --------0.541 ----0.090 ---------
NOM
0.079 0.050 0.051 0.016 0.016 0.400 0.342 0.100 0.200 0.561 0.169 0.100 ----0.287
MAX
0.089 0.066 0.053 0.017 0.018 0.420 0.354 --------0.580 ----0.110 0.070 -----
Taping Specification
PACKAGE
TO-263 TO-263T
Feed Direction TO-263/TO-263T Package Orientation
Q'TY/REEL
800 ea 1,500 ea
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 0.9 Apr 24, 2007
TEL: 886-3-5788833 http://www.gmt.com.tw
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