Ver: 1.5
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G965
Global Mixed-mode Technology Inc.
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
10A Quiescent Current in Shutdown
SOP-8 Package
Applications
Battery Powered Systems
Motherboards
Peripheral Cards
Network Cards
Set Top Boxes
Medical Equipment
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.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING TEMP.
RANGE PACKAGE
G965-15ADJP1U G965-15ADJP1Uf
G965-15
-40C ~ +85C
SOP-8
G965-18ADJP1U G965-18ADJP1Uf
G965-18
-40C ~ +85C
SOP-8
G965-25ADJP1U G965-25ADJP1Uf
G965-25
-40C ~ +85C
SOP-8
Note:
P1: SOP-8
U : Tape & Reel
e.g. 18 denotes the 1.8V output voltage.
Pin Configuration Typical Application Circuit
VO
8
6
5
1
2
3
4
VEN
VIN
ADJ
SOP-8
G965
7
GND
GND
GND
GND
VIN
VO
R1
R2
VEN
VIN
VO
ADJ
GND
G965
1.2 (R1+R2)
VO =
R2
Volts
C1
22F
C2
47F
R2=12k
is recommended
VEN
R3
I
ENH
R3 should be connected for current I
ENH
restriction as V
EN
> V
IN
+0.3V
VO
8
6
5
1
2
3
4
VEN
VIN
ADJ
SOP-8
G965
7
GND
GND
GND
GND
VIN
VO
R1
R2
VEN
VIN
VO
ADJ
GND
G965
1.2 (R1+R2)
VO =
R2
Volts
C1
22F
C2
47F
R2=12k
is recommended
VEN
R3
I
ENH
VEN
R3
I
ENH
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
2
G965
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
(Note 1)
Input Voltage....................................................7V
V
EN
Voltage.............................................V
IN
+0.3V
Power Dissipation Internally Limited (Note 2)
Maximum Junction Temperature.....................150C
Storage Temperature Range........-65C
T
J
+150C
Reflow Temperature (soldering, 10sec)...........260C
Thermal Resistance Junction to Ambient, (
JA
)
SOP-8...................................................162C/W
Thermal Resistance Junction to Case, (
JC
)
SOP-8.......................................................31C/W
ESD Rating (Human Body Model)......................2kV
Operation Conditions
(Note 1)
Input Voltage.........................................2.2V ~5.5V
Temperature Range......................-40C
T
A
+85C
Electrical Characteristics
V
EN
=V
IN
, V
IN
=5V, I
O
= 0.5A, C
IN
= 4.7F, C
OUT
=10F, T
A
= T
J
= 25C unless otherwise specified (Note 3)
PARAMETER SYMBOL
CONDITION
MIN
TYP
MAX
UNIT
Supply Voltage
V
IN
2.2 --- 5.5 V
Output Voltage
V
O
V
IN
=V
O
+0.7V, I
O
=10mA -2
V
O
2 %
Line Regulation
V
O
+0.7V < V
IN
< 5.5V, I
O
=10mA ---
0.2
2
%
Load Regulation
10mA < I
O
< 1.5A
---
0.8
2
%
V
IN
=3.3V,V
EN
=V
IN
---
1.7
2.5
mA
Quiescent Current
I
Q
V
IN
=3.3V,V
EN
=0V
---
16
35
A
Ripple Rejection
fi=120Hz, 1V
P-P
, I
O
=100mA ---
55
---
dB
Dropout Voltage
V
D
I
O
=1.5A ---
0.5
0.65
V
Short Circuit Current
---
0.8
---
A
Over
Temperature
--- 150 --- C
V
EN
Voltage High
V
ENH
Output
Active
1.6 --- ---
V
V
EN
Voltage Low
V
ENL
Output
Disabled
--- --- 0.4 V
V
EN
Bias Current Low
I
ENL
V
EN
=0.4V ---
---
20
A
ADJ Reference Voltage
V
REF
V
IN
=2.2V, V
ADJ
=V
OUT
, I
O
=10mA
1.188 1.2 1.212
V
ADJ Pin Threshold
---
0.2
---
V
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.
Note 2: The maximum power dissipation is a function of the maximum junction temperature, T
Jmax
; total thermal
resistance,
JA
, and ambient temperature T
A
. The maximum allowable power dissipation at any ambient
temperature is (T
jmax
-T
A
)
/
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.
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.
Ver: 1.5
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G965
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
V
EN
=V
IN
, V
IN
=5V, I
O
= 0.5A, C
IN
= 4.7F, C
OUT
=10F, T
A
= T
J
= 25C
Line Transient Response(G965-18)
Load Transient Response(G965-18)
Line Transient(G965-15)
Load Transient(G965-15)
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
4
G965
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(continued)
Overcurrent Protection Characteristics(G965-18)
Start-up(G965-18)
Start-UP(G965-15)
Overcurrent Protection Characteristics(G965-15)
Overcurrent Protection Characteristics(G965-25)
Start-up(G965-25)
Ver: 1.5
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G965
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(continued)
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
-25 -15 -5
5
15 25 35 45 55 65 75 85
Temperature (C)
Q
u
ies
c
en
t Cu
rr
ent
(m
A)
0
100
200
300
400
500
600
700
0
250
500
750
1000
1250
1500
I
L
(mA)
D
r
op
ou
t Vo
ltag
e (
m
V)
T=-25C
V
IN
=3V
V
IN
=5V
T=25C
T=85C
Quiescent Current vs. Temperature(G965-18)
Dropout Voltage vs. I
L
(G965-18)
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
-25 -15 -5
5
15 25 35 45 55 65 75 85
Temperature (C)
Q
u
ies
c
en
t Cu
rr
ent
(m
A)
V
IN
=3V
V
IN
=5V
0
100
200
300
400
500
600
700
-25 -15 -5
5 15 25 35 45 55 65 75 85
Temperature (C)
Dr
opo
ut Volta
g
e
(m
V)
I
L
=300mA
I
L
=1A
Quiescent Current vs. Temperature(G965-15)
Dropout Voltage vs.Temperature(G965-15)
2.50
2.75
3.00
3.25
3.50
3.75
4.00
-25 -15 -5
5 15 25 35 45 55 65 75 85
Temperature (C)
Qu
iesc
ent
Cur
r
e
n
t
(m
A)
0
100
200
300
400
500
600
700
0
0.25
0.5
0.75
1
1.25
1.5
I
L
(A)
Dr
opo
ut Volta
g
e
(m
V)
V
IN
=4V
V
IN
=5V
T=85C
T=25C
Quiescent Current vs. Temperature(G965-25)
Dropout Voltage vs. I
L
(G965-25)
T=-25C
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