Global Mixed-mode Technology Inc.
G9125
2.5V 1A Low Dropout Regulator with Disable
Features
Dropout voltage 0.6V @ I
O
= 1A
Output current in excess of 1A
Output voltage accuracy ±2.5%
Quiescent current, typically 5mA
Internal short circuit current limit
Internal over temperature protection
TO-220 4pin Full-Mold, TO-252-5 package
ON/OFF control
General Description
The G9125 positive 2.5V voltage regulator features
the ability to source 1A of output current. The dropout
voltage is 0.6V at 1A output current. The typical qui-
escent current is 5mA. Furthermore, the quiescent
current is smaller when the regulator is in the dropout
mode.
Familiar regulator features such as over tem-
perature and over current protection circuits are
provided to prevent it from being damaged by
abnormal operating conditions. A V
dis
pin is pro-
vided to disable the output when needed.
Ordering Information
ORDER
NUMBER
G9125TF1T
G9125TH1T
G9125TJU
ORDER NUMBER
(Pb free)
G9125TF1Tf
G9125TH1Tf
G9125TJUf
MARKING
G9125
G9125
G9125
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PACKAGE
TO-220F-4
TO-220F-4
TO-252-5
1
V
IN
V
IN
PIN OPTION
2
3
V
O
V
O
GND
GND
4
V
dis
V
dis
Order Number Identification
GXXXX
XX
X
X
Packing Type
Pin Option
(only TO-220F-4)
Package Type
Part Number
PACKAGE TYPE
TF: TO220F-4 (short lead)
TH: TO220F-4 (long lead)
TJ: TO-252-5
1
1.: V
IN
PIN OPTION
(only TO-220F-4)
2
V
O
3
GND
4
V
dis
PACKING
T : Tube
U: Tape & Reel
Package Type
Typical Application
TO-220F-4
TO-252-5
ON/OFF
I
O
V
IN
C1
4.7µF
Top View
G9125
IQ
V
OUT
C
OUT
47µF
1
2
3
4
1
2
3
4
5
VIN V
dis
VO NC GND
Ver: 0.6 Preliminary
Nov 11, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
(Note 1)
Input Voltage……………………….…….……….……..8V
V
dis
Voltage………………………………………………8V
Power Dissipation Internally Limited
(Note 2)
Maximum Junction Temperature.…..…….…………150°C
Storage Temperature Range……...-65°C
≤
T
J
≤+150°C
Reflow Temperature (Soldering, 10 sec)…..……260°C
Continuous Power Dissipation (T
A
= +25°C)
TO-220 No heatsink…..………….…………………1.5W
TO-220 with infinite heatsink………..…..…….……15W
Thermal Resistance Junction to Ambient, (θ
JA
)
TO-252-5…………………………………………95°C/W
Thermal Resistance Junction to Case, (θ
JC
)
TO-252-5…………………………………………..….8°C/W
G9125
Absolute Maximum Ratings
Operating Conditions
(Note 1)
Input Voltage…………………………….………..3.6V~7V
Temperature Range………….….…….-40°C
≤
T
A
≤85°C
Electrical Characteristics
V
IN
=5V, I
O
= 0.5A, C
IN
= 4.7µF, C
OUT
=47µF, T
A
= T
J
= 25°C unless otherwise specified [Note 3]
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Ripple Rejection
Dropout Voltage
Short Circuit Current
Over Temperature
Disable Voltage High
Disable Voltage Low
Disable Bias Current High
Disable Bias Current Low
V
disH
V
disL
I
disH
I
disL
SYMBOL
CONDITION
I
O
=0.5A
4V < V
IN
< 7V, I
O
= 10mA
50mA < I
O
< 1A
V
IN
= 5V
fi = 120Hz, 1VP-P, I
O
= 100mA
I
O
= 1A
MIN
2.44
---
---
---
---
---
---
---
2.0
---
---
---
TYP
2.5
0.5
0.5
5
45
0.4
3.8
150
---
---
---
---
MAX
2.56
2
2
10
---
0.6
---
---
---
0.8
20
20
UNIT
V
%
%
mA
dB
V
A
°C
V
V
µA
µA
Output Active
Output Disabled
V
dis
= 2.7V
V
dis
= 0.4V
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, T
Jmax
; total thermal resistance,
θ
JA
, and ambient temperature T
A
. The maximum allowable power dissipation at any ambient temperature is T
jmax
-T
A
/
θ
JA
. If this dissipation is exceeded, the die temperature will rise above 150°C and IC will go into thermal shutdown. For
the TO-220 package,
θ
JA
is 60°C/W (No heat sink).
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.
Definitions
Dropout Voltage
The input/output Voltage differential at which the regu-
lator output no longer maintains regulation against fur-
ther reductions in input voltage. Measured when the
output drops 2% below its nominal value, dropout volt-
age 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.
Load Regulation
The change in output voltage for a change in load
current at constant chip temperature. The measure-
ment 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 de-
vice 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: 0.6 Preliminary
Nov 11, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2
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