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Global Mixed-mode Technology Inc.
G1085
3A Adjustable Low-Dropout Linear Regulator
Features
Available in Adjust Version Space Saving TO-252 Package and TO-263 Package Internal Short Circuit Current Limiting Internal Over Temperature Protection Output Current 3A
General Description
The G1085 is a low dropout linear regulator with a dropout of 1.2V at 3A of load current. It is available in an adjustable version, which can set the output from 1.25V to 5V with only two external resistors. The G1085 provides over temperature and over current protection circuits to prevent it from being damaged by abnormal operating conditions. The G1085 is available in TO-252 package and TO- 263 packages. A minimum of 100F tantalum electrolytic capacitor is required at the output to improve the transient response and stability.
Applications
Post Regulation for Switching DC/DC Converter High Efficiency Linear Regulator Battery Charger Battery Powered Instrumentation Motherboard
Ordering Information
ORDER NUMBER
G1085T43U G1085T53U
ORDER NUMBER
(Pb free)
G1085T43Uf G1085T53Uf
MARKING
G1085 G1085
TEMP. RANGE
-40C to +85C -40C to +85C
PACKAGE
TO-252 TO-263
1
GND/ADJ GND/ADJ
PIN OPTION 2 3
VOUT VOUT VIN VIN
* For other package types and pin options, please contact us at sales @gmt.com.tw
Order Number Identification
GXXXX XX X X Packing Type Pin Option Package Type Part Number PACKAGE TYPE
T4: TO-252 T5: TO-263
PIN OPTION
1 3: GND/ADJ 2 VOUT 3 VIN
PACKING
U & D: Tape & Reel Direction T: Tube
Package Type
Typical Application
[Note 4]: Type of COUT
IO VIN VIN
G1085 VOUT
GND/ADJ
VOUT
Top View
C1 100F
R1 R2
COUT 100F
1
2
3
TO-252TO-263
Ver: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings (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 TO-252(1).................................................125C/W TO-263(1).................................................100C/W Thermal Resistance Junction to Case TO-252......................................................10C/W TO-263.......................................................6C/W ESD Rating (Human Body Model)............................2kV
Note (1): See Recommended Minimum Footprint
G1085
Operating Conditions (Note 1) (VIN-VADJ) Voltage.....................................2.5V~5.5V Temperature Range.........................-40C TA 85C
Electrical Characteristics
Operating Conditions: VIN 7V, TA =TJ = 25C unless otherwise specified. [Note3] PARAMETER
Reference Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Adjust Pin Current Change Minimum Load Current Quiescent Current Ripple Rejection Temperature Stability RMS Output Noise (% of VOUT) Thermal Shutdown Thermal Shutdown Hysteresis
CONDITION
VIN - VOUT = 2V, IOUT = 10mA (VOUT + 1.5V) < VIN < 7V, IOUT = 10mA (VIN - VOUT) = 2V, 10mA < IOUT <3A VOUT = 2%, IOUT = 3A (VIN - VOUT) = 2V VIN - VOUT = 2V, 10mA < IOUT < 3A 1.5V < (VIN - VOUT) < 5.25V VIN - VOUT = 2V f = 120Hz, COUT = 10F Tantalum, (VIN - VOUT) = 3V, IOUT = 1A VIN = 4V, IO =10mA TA = 25C, 10Hz < f < 10kHz, ILOAD = 10mA Junction Temperature
MIN
1.225 ----------10 -------------
TYP
1.250 0.5 0.04 1.3 5.4 0.15 --80 48 0.3 0.007 150 30
MAX
1.275 1 0.5 1.4 ------150 -----------
UNIT
V % % V A A mA A dB % % C 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. Note4: The type of output capacitor should be tantalum or aluminum.
Ver: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Definitions
Output Voltage The G1085 provides an adjustable output voltage from 1.25V to 5V. with two external resistors. It can be formulated as: VOUT = 1.25V x (1+ IADJ = 80A (TYP) 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. R2 R1
G1085
) + IADJ x R2
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. 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: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN-VOUT=3V, VOUT=1.25V, CIN=100F, COUT =100F, TA=25C, unless otherwise noted.)
Line Transient Response
G1085
Load Transient Response
Short Circuit-Current
IL=100mA
Output Noise
Ripple Rejection
70 60 Ripple Rejection (dB) 50 40 30 20 10 0
10 100 1000 10000 100000 1000000
Line Regulation
1.275 IL=10mA
100mA 1.265 2A VOUT (V) 1.255
T=75C
3A (VIN-VOUT)>Vdropout Vripple<0.5 VP-P COUT=220F
1A
1.245
1.235 T=25C 1.225 2.5 3 3.5 4 4.5 5 VIN (V) 5.5 T=25C 6 6.5 7
Frequency(Hz)
Ver: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Dropout Voltage vs. IOUT
2
G1085
Load Regulation
5 T = 25C
Output Voltage Deviation (mV)
3
IL = 10mA~2.5A
Dropout Voltage (V)
1.5
1 VIN = 3V -1 VIN = 5V
1
0.5
-3
0 0 1 2 3 4
-5 -50 -30 -10 10 30 50 70
IOUT (A)
Temperature (C)
Output Voltage vs. Temperature
1.255
Adj Pin Current vs. Temperature
100 90
1.253
VIN = 5V
Adj Pin Current (A)
80 70 60 50 40 30 VIN = 3V VIN = 5V
1.250
VOUT (V)
1.248
VIN = 3V
1.245
1.243
IL = 2.5A = 2.5A IL
1.240 -50 -30 -10 10 30 50 70
-50
-30
-10
10
30
50
70
Temperature (C)
Temperature (C)
G1085T43(TO-252) Max. Power Dissipation vs. PCB Top Copper Area TAMB = 25C ; Still Air
4 3.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0 1 2 3
G1085T43(TO-252) Max. Power Dissipation vs. TAMB (still air) ( Different PCB Top Copper Area )
Unit : in2
A=0.1 A=0.2 A=0.3 A=0.4 A=0.5 A=1.0 A=1.5 A=2.0 A=2.5 A=3.0 A=3.5 A=4.0 A=4.5 A=5.0
Max. Dissipation Power (W)
3 2.5 2 1.5 1 0.5 0
Max. Dissipation Power (W)
PCB Top Copper Area (in )
2
4
5
25
35
45
TAMB (C)
55
65
75
85
Ver: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G1085
G1085T53(TO-263) Max. Power Dissipation vs. PCB Top Copper Area TAMB = 25C ; Still Air
4.5 4.5 4 4 3.5 3 2.5 2 1.5 1 0.5 0 0.5 1.5 2.5 3.5 4.5 25
G1085T53(TO-263) Max. Power Dissipation vs. TAMB (still air) ( Different PCB Top Copper Area )
Unit : in2 A=0.5 A=1.0 A=1.5 A=2.0 A=2.5 A=3.0 A=3.5 A=4.0 A=4.5 A=5.0
Max. Dissipation Power (W)
3.5 3 2.5 2 1.5 1 0.5 0
Max. Dissipation Power (W)
35
45
PCB Top Copper Area (in2)
TAMB (C)
55
65
75
85
Recommend Minimum Footprint
Ver: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
Package Information
E E1 L1 A F
G1085
D
H
L2 b e1 e
A1
L3
C
TO-252 (T4) Package SYMBOL
A A1 b C D E E1 e e1 F L1 L2 L3 H
DIMENSION IN MILLIMETER MIN. MAX.
2.19 0.89 0.64 0.46 5.97 6.35 5.21 2.26 BSC 3.96 0.46 0.89 0.64 2.40 9.40 0 5.18 0.58 2.03 1.02 2.80 10.40 4 2.38 1.27 0.89 0.58 6.22 6.73 5.46
DIMENSION IN INCH MIN. MAX.
0.086 0.035 0.025 0.018 0.235 0.250 0.205 0.09 BSC 0.156 0.018 0.035 0.025 0.095 0.370 0 0.204 0.023 0.080 0.040 0.110 0.410 4 0.094 0.050 0.035 0.023 0.245 0.265 0.215
Ver: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
7
Global Mixed-mode Technology Inc.
E A A1 L3
G1085
D
H L1 C
e L2 e1 b b1 A2
L
TO-263 (T5) Package MILLIMETER MIN
4.30 1.22 2.45 0.69 1.22 0.36 8.64 9.70 2.29 4.83 14.60 4.70 1.20 2.24 1.40MAX
SYMBOL
A A1 A2 b b1 C D E e e1 H L L1 L2 L3
INCH MAX
4.70 1.32 2.69 0.94 1.40 0.56 9.652 10.54 2.79 5.33 15.78 5.84 1.778 2.84
MIN
0.169 0.048 0.104 0.027 0.048 0.014 0.340 0.382 0.090 0.190 0.575 0.185 0.047 0.088 0.055MAX
MAX
0.185 0.055 0.106 0.037 0.055 0.022 0.380 0.415 0.110 0.210 0.625 0.230 0.070 0.111
Package Orientation
PACKAGE
TO-252 TO-263
Feed Direction TO-252 Package Orientation Feed Direction TO-263 Package Orientation
Q'TY/REEL
2,500 ea 1,000 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: 1.2 Sep 20, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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