Global Mixed-mode Technology Inc.
G965
1.5A Low Dropout Regulator with Enable
Features
Adjustable Output from 1.2V to 4.8V Using Ex-
ternal Resistors
1.5V, 1.8V and 2.5V Options by Setting ADJ Pin
Below 0.2V
Over Current and Over Temperature Protection
500mV Dropout @1.5A
Enable Pin
10µA Quiescent Current in Shutdown
SOP-8 Package
Notebook Computers
General Description
The G965 is a high performance positive voltage
regulator designed for use in applications requiring
very low dropout voltage at up to 1.5 Amps. Since it
has superior dropout characteristics compared to
regular LDOs, it can be used to supply 2.5V on moth-
erboards or 1.5V, 1.8V on peripheral cards from the
3.3V supply thus allowing the elimination of costly
heatsinks. An enable pin further reduces power dissi-
pation while shut down. The G965 provides excellent
regulation over variations in line, load and tempera-
ture.
The SOP-8 is available with 1.5V, 1.8V and 2.5V in-
ternally preset outputs that are also adjustable using
external resistors.
Applications
Battery Powered Systems
Motherboards
Peripheral Cards
Network Cards
Set Top Boxes
Medical Equipment
Ordering Information
ORDER
NUMBER
G965-15ADJP1U
G965-18ADJP1U
G965-25ADJP1U
ORDER NUMBER
(Pb free)
G965-15ADJP1Uf
G965-18ADJP1Uf
G965-25ADJP1Uf
MARKING
G965-15
G965-18
G965-25
TEMP. RANGE
-40°C ~ +85°C
-40°C ~ +85°C
-40°C ~ +85°C
PACKAGE
SOP-8
SOP-8
SOP-8
Note:
P1: SOP-8
U : Tape & Reel
e.g. 18 denotes the 1.8V output voltage.
Pin Configuration
Typical Application Circuit
G965
VEN
VIN
VO
ADJ
1
2
3
4
8
7
6
5
GND
GND
GND
GND
R3
VEN
VIN
VO
R1
C1
22µF
C2
47µF
R2
I
ENH
G965
VEN
VIN
VO
ADJ
GND
SOP-8
1.2 (R1+R2)
VO =
Volts
R2
R2=12kΩ is recommended
R3 should be connected for current I
ENH
restriction as V
EN
> V
IN
+0.3V
Ver: 1.5
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
(Note 1)
Input Voltage……………………….……..……….……7V
V
EN
Voltage…………..……………….…………V
IN
+0.3V
Power Dissipation Internally Limited
(Note 2)
Maximum Junction Temperature…………………150°C
Storage Temperature Range…..…-65°C
≤T
J
≤
+150°C
Reflow Temperature (soldering, 10sec)…….….260°C
Thermal Resistance Junction to Ambient, (θ
JA
)
SOP-8……………………………………..….…162°C/W
Thermal Resistance Junction to Case, (θ
JC
)
SOP-8……………………………………………....31°C/W
ESD Rating (Human Body Model)………..……..…2kV
G965
Absolute Maximum Ratings
(Note 1)
Input Voltage……………………………….….2.2V ~5.5V
Temperature Range………….………-40°C
≤T
A
≤
+85°C
Operation Conditions
Electrical Characteristics
V
EN
=V
IN
, V
IN
=5V, I
O
= 0.5A, C
IN
= 4.7µF, C
OUT
=10µF, T
A
= T
J
= 25°C unless otherwise specified (Note 3)
PARAMETER
Supply Voltage
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Ripple Rejection
Dropout Voltage
Short Circuit Current
Over Temperature
V
EN
Voltage High
V
EN
Voltage Low
V
EN
Bias Current Low
ADJ Reference Voltage
ADJ Pin Threshold
V
ENH
V
ENL
I
ENL
V
REF
Output Active
Output Disabled
V
EN
=0.4V
V
IN
=2.2V, V
ADJ
=V
OUT
, I
O
=10mA
SYMBOL
V
IN
V
O
CONDITION
V
IN
=V
O
+0.7V, I
O
=10mA
V
O
+0.7V < V
IN
< 5.5V, I
O
=10mA
10mA < I
O
< 1.5A
V
IN
=3.3V,V
EN
=V
IN
V
IN
=3.3V,V
EN
=0V
fi=120Hz, 1V
P-P
, I
O
=100mA
I
O
=1.5A
MIN
2.2
-2
---
---
---
---
---
---
---
---
1.6
---
---
1.188
---
TYP
---
V
O
0.2
0.8
1.7
16
55
0.5
0.8
150
---
---
---
1.2
0.2
MAX
5.5
2
2
2
2.5
35
---
0.65
---
---
---
0.4
20
1.212
---
UNIT
V
%
%
%
mA
µA
dB
V
A
°C
V
V
µA
V
V
I
Q
V
D
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Con-
ditions 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.
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 regula-
tor 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 mini-
mum input supply requirements.
Line Regulation
The change in output voltage for a change in input volt-
age. The measurement is made under conditions of low
dissipation or by using pulse techniques such that aver-
age 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 tem-
perature 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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Apr 01, 2005
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
V
EN
=V
IN
, V
IN
=5V, I
O
= 0.5A, C
IN
= 4.7µF, C
OUT
=10µF, T
A
= T
J
= 25°C
Line Transient(G965-15)
G965
Load Transient(G965-15)
Line Transient Response(G965-18)
Load Transient Response(G965-18)
Line Transient Response(G965-25)
Load Transient Response(G965-25)
Ver: 1.5
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(continued)
G965
Start-UP(G965-15)
Overcurrent Protection Characteristics(G965-15)
Start-up(G965-18)
Overcurrent Protection Characteristics(G965-18)
Start-up(G965-25)
Overcurrent Protection Characteristics(G965-25)
Ver: 1.5
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(continued)
G965
Quiescent Current vs. Temperature(G965-15)
1.7
1.65
Quiescent Current (mA)
1.6
1.55
1.5
1.45
V
IN
=3V
1.4
1.35
1.3
-25 -15 -5
5
15 25 35 45 55 65 75 85
Temperature (°C)
V
IN
=5V
Dropout Voltage (mV)
Dropout Voltage vs.Temperature(G965-15)
700
600
500
400
300
200
100
0
-25 -15 -5
5
15 25 35 45 55 65 75 85
Temperature (°C)
I
L
=300mA
I
L
=1A
Quiescent Current vs. Temperature(G965-18)
2.00
1.95
Quiescent Current (mA)
1.90
Dropout Voltage (mV)
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
-25 -15 -5
5
15 25 35 45 55 65 75 85
Temperature (°C)
100
0
0
V
IN
=3V
V
IN
=5V
500
400
700
600
Dropout Voltage vs. I
L
(G965-18)
T=85°C
T=25°C
300
200
T=-25°C
250
500
750
1000
I
L
(mA)
1250
1500
Quiescent Current vs. Temperature(G965-25)
4.00
3.75
Quiescent Current (mA)
Dropout Voltage (mV)
3.50
V
IN
=5V
3.25
3.00
2.75
2.50
-25 -15 -5
5
15 25 35 45 55 65 75 85
Temperature (°C)
700
600
500
Dropout Voltage vs. I
L
(G965-25)
T=85°C
400
300
200
100
0
0
0.25
0.5
0.75
I
L
(A)
1
1.25
1.5
T=-25°C
T=25°C
V
IN
=4V
Ver: 1.5
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
