GMT G1085 3a adjustable low-dropout linear regulator Datasheet

G1085
Global Mixed-mode Technology Inc.
3A Adjustable Low-Dropout Linear Regulator
Features
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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.
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
The G1085 provides over temperature and over
current protection circuits to prevent it from being
damaged by abnormal operating conditions.
Applications
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„
„
„
Post Regulation for Switching DC/DC Converter
High Efficiency Linear Regulator
Battery Charger
Battery Powered Instrumentation
Motherboard
The G1085 is available in TO-252 package and
TO- 263 packages. A minimum of 100µF tantalum
electrolytic capacitor is required at the output to
improve the transient response and stability.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
G1085T43U
G1085T53U
G1085T43Uf
G1085T53Uf
(Pb free)
MARKING
TEMP.
RANGE
PACKAGE
G1085
G1085
-40°C to +85°C
-40°C to +85°C
TO-252
TO-263
PIN OPTION
2
3
1
GND/ADJ
GND/ADJ
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
PIN OPTION
1
3: GND/ADJ
T4: TO-252
T5: TO-263
Package Type
2
VOUT
PACKING
3
VIN
U & D: Tape & Reel Direction
T: Tube
Typical Application
[Note 4]: Type of COUT
IO
VIN
VIN
C1
100µF
2
VOUT
GND/ADJ
Top View
1
G1085 VOUT
R1
R2
COUT
100µF
3
TO-252、TO-263
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Sep 20, 2004
1
G1085
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
(Note 1)
Input Voltage…………………………….………………7V
Power Dissipation Internally Limited
(Note 2)
Maximum Junction Temperature…...……………….150°C
Storage Temperature Range…..…-65°C ≤ TJ
≤+150°C
Reflow Temperature (soldering, 10sec)…………260°C
Thermal Resistance Junction to Ambient
TO-252(1)………………………………….………125°C/W
TO-263(1)………………………………….………100°C/W
Thermal Resistance Junction to Case
TO-252………….………………..………..….……10°C/W
TO-263…..………………………...……..…………6°C/W
ESD Rating (Human Body Model)……......................2kV
Operating Conditions
(Note 1)
(VIN-VADJ) Voltage………..…………...………..2.5V~5.5V
Temperature Range……………..….….-40°C ≤ TA ≤85°C
Note (1): See Recommended Minimum Footprint
Electrical Characteristics
Operating Conditions: VIN ≤ 7V, TA =TJ = 25°C unless otherwise specified. [Note3]
PARAMETER
CONDITION
MIN
TYP
MAX
UNIT
1.225
---
1.250
0.5
1.275
1
V
%
Reference Voltage
Line Regulation
VIN - VOUT = 2V, IOUT = 10mA
(VOUT + 1.5V) < VIN < 7V, IOUT = 10mA
Load Regulation
(VIN - VOUT) = 2V, 10mA < IOUT <3A
∆VOUT = 2%, IOUT = 3A
-----
0.04
1.3
0.5
1.4
%
V
(VIN - VOUT) = 2V
---
5.4
---
A
Adjust Pin Current Change
Minimum Load Current
VIN - VOUT = 2V, 10mA < IOUT < 3A
1.5V < (VIN - VOUT) < 5.25V
--10
0.15
---
-----
µA
mA
Quiescent Current
VIN - VOUT = 2V
---
80
150
µA
---
48
---
dB
---
0.3
---
%
-------
0.007
150
30
-------
%
°C
°C
Dropout Voltage
Current Limit
Ripple Rejection
Temperature Stability
RMS Output Noise (% of VOUT)
Thermal Shutdown
Thermal Shutdown Hysteresis
f = 120Hz, COUT = 10µF Tantalum,
(VIN - VOUT) = 3V, IOUT = 1A
VIN = 4V, IO =10mA
TA = 25°C, 10Hz < f < 10kHz, ILOAD = 10mA
Junction Temperature
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, θJA, and ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is Tjmax-TA / θJA. If this dissipation is exceeded, the die temperature will rise above 150°C 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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Sep 20, 2004
2
Global Mixed-mode Technology Inc.
G1085
Definitions
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.
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+
R2
R1
) + IADJ x R2
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.
IADJ = 80µA (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.
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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Sep 20, 2004
3
G1085
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN-VOUT=3V, VOUT=1.25V, CIN=100µF, COUT =100µF, TA=25°C, unless otherwise noted.)
Line Transient Response
Load Transient Response
Short Circuit-Current
Output Noise
IL=100mA
Ripple Rejection
Line Regulation
1.275
70
100mA
IL=10mA
1.265
50
2A
VOUT (V)
Ripple Rejection (dB)
60
40
30
3A
20
1A
(VIN-VOUT)>Vdropout
Vripple<0.5 VP-P
COUT=220µF
10
T=75°C
1.255
1.245
1.235
T=25°C
T=25°C
1.225
0
10
100
1000
10000
100000
2.5
1000000
Frequency(Hz)
3
3.5
4
4.5 5
VIN (V)
5.5
6
6.5
7
TEL: 886-3-5788833
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Ver: 1.2
Sep 20, 2004
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G1085
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Dropout Voltage vs. IOUT
Load Regulation
5
Output Voltage Deviation (mV)
2
Dropout Voltage (V)
T = 25°C
1.5
1
0.5
IL = 10mA~2.5A
3
1
VIN = 3V
-1
VIN = 5V
-3
-5
0
0
1
2
3
-50
4
-30
-10
IOUT (A)
30
50
70
Adj Pin Current vs. Temperature
Output Voltage vs. Temperature
100
1.255
1.253
90
Adj Pin Current (µA)
VIN = 5V
1.250
VOUT (V)
10
Temperature (°C)
VIN = 3V
1.248
1.245
1.243
80
VIN = 5V
70
60
50
VIN = 3V
40
IL = 2.5A
IL = 2.5A
30
1.240
-50
-30
-10
10
30
50
-50
70
-30
Temperature (°C)
-10
10
30
50
70
Temperature (°C)
G1085T43(TO-252) Max. Power
Dissipation vs. PCB Top Copper
Area TAMB = 25°C ; Still Air
G1085T43(TO-252) Max. Power
Dissipation vs. TAMB (still air)
( Different PCB Top Copper Area )
4
4
3.5
3.5
Unit : in2
Max. Dissipation Power (W)
Max. Dissipation Power (W)
A=0.1
3
2.5
2
1.5
1
A=0.2
A=0.3
3
A=0.4
A=0.5
2.5
A=1.0
A=1.5
2
A=2.0
A=2.5
1.5
A=3.0
1
A=3.5
A=4.0
0.5
0.5
0
0
A=4.5
A=5.0
0
1
2
3
2
4
25
5
PCB Top Copper Area (in )
35
45
55
TAMB (°C)
65
75
85
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Sep 20, 2004
5
G1085
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G1085T53(TO-263) Max. Power
Dissipation vs. TAMB (still air)
( Different PCB Top Copper Area )
4.5
4.5
4
4
Max. Dissipation Power (W)
Max. Dissipation Power (W)
G1085T53(TO-263) Max. Power
Dissipation vs. PCB Top Copper
Area TAMB = 25°C ; Still Air
3.5
3
2.5
2
1.5
1
A=1.0
A=2.0
2.5
A=2.5
4.5
A=3.5
1.5
A=4.0
1
0
3.5
A=3.0
2
0
2.5
A=1.5
3
0.5
1.5
A=0.5
3.5
0.5
0.5
Unit : in2
A=4.5
A=5.0
25
PCB Top Copper Area (in2)
35
45
55
TAMB (°C)
65
75
85
Recommend Minimum Footprint
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Sep 20, 2004
6
G1085
Global Mixed-mode Technology Inc.
Package Information
E
A
F
E1
L1
H
D
L2
A1
L3
θ
b
e
C
e1
TO-252 (T4) Package
SYMBOL
DIMENSION IN MILLIMETER
MIN.
MAX.
DIMENSION IN INCH
MIN.
MAX.
A
A1
2.19
0.89
2.38
1.27
0.086
0.035
0.094
0.050
b
C
0.64
0.46
0.89
0.58
0.025
0.018
0.035
0.023
D
5.97
6.22
0.235
0.245
E
E1
e
e1
F
L1
L2
6.35
5.21
6.73
5.46
0.250
0.205
0.265
0.215
5.18
0.58
2.03
1.02
0.156
0.018
0.035
0.025
0.204
0.023
0.080
0.040
2.26 BSC
3.96
0.46
0.89
0.64
0.09 BSC
L3
2.40
2.80
0.095
0.110
H
9.40
0°
10.40
4°
0.370
0°
0.410
4°
θ
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Sep 20, 2004
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G1085
Global Mixed-mode Technology Inc.
A
E
A1
L3
D
H
C
L1
L
e
L2
A2
e1
b
b1
TO-263 (T5) Package
SYMBOL
MILLIMETER
INCH
MIN
MAX
MIN
MAX
A
A1
A2
4.30
1.22
2.45
4.70
1.32
2.69
0.169
0.048
0.104
0.185
0.055
0.106
b
0.69
0.94
0.027
0.037
b1
C
1.22
0.36
1.40
0.56
0.048
0.014
0.055
0.022
D
E
e
e1
H
8.64
9.70
2.29
4.83
14.60
9.652
10.54
2.79
5.33
15.78
0.340
0.382
0.090
0.190
0.575
0.380
0.415
0.110
0.210
0.625
L
L1
L2
L3
4.70
1.20
2.24
5.84
1.778
2.84
0.185
0.047
0.088
0.230
0.070
0.111
1.40MAX
0.055MAX
Package Orientation
Feed Direction
TO-252 Package Orientation
PACKAGE
Q’TY/REEL
TO-252
TO-263
2,500 ea
1,000 ea
Feed Direction
TO-263 Package Orientation
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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.2
Sep 20, 2004
8
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