Ver: 1.2
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G961
Global Mixed-mode Technology Inc.
1A 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
400mV dropout @1A
Enable pin
10A quiescent current in shutdown
SOT-89-5 Package
Applications
Battery powered systems
Motherboards
Peripheral cards
Network cards
Set Top Boxes
Medical Equipment
Notebook Computers
General Description
The G961 is a high performance positive voltage
regulator designed for use in applications requiring
very low dropout voltage at up to 1 Amps. Since it has
superior dropout characteristics compared to regular
LDOs, it can be used to supply 2.5V on motherboards
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 dissipation while
shut down. The G961 provides excellent regulation
over variations in line, load and temperature.
The SOT-89-5 is available with 1.5V, 1.8V and 2.5V
internally preset outputs that are also adjustable using
external resistors.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
TEMP.
RANGE
PACKAGE
G961-15ADJTEU G961-15ADJTEUf
961-15
-40C ~ +85C
SOT-89-5
G961-18ADJTEU G961-18ADJTEUf
961-18
-40C ~ +85C
SOT-89-5
G961-25ADJTEU G961-25ADJTEUf
961-25
-40C ~ +85C
SOT-89-5
Note:
TE: SOT-89-5
U : Tape & Reel
e.g. 18 denotes the 1.8V output voltage.
Pin Configuration Typical Application Circuit
VEN
VIN
VO
R1
R2
VEN
VIN
VO
ADJ
GND
G961
1.2 (R1+R2)
VO =
R2
Volts
VO
ADJ
SOT-89-5
G961
1
2
3
5
4
GND
VEN
VIN
C1
22F
C2
47F
R2=12k
is recommended
R3 should be connected for current I
ENH
restriction as V
EN
> V
IN
+0.3V
R3
I
ENH
VEN
VIN
VO
R1
R2
VEN
VIN
VO
ADJ
GND
G961
1.2 (R1+R2)
VO =
R2
Volts
VO
ADJ
SOT-89-5
G961
1
2
3
5
4
GND
VEN
VIN
C1
22F
C2
47F
R2=12k
is recommended
R3 should be connected for current I
ENH
restriction as V
EN
> V
IN
+0.3V
R3
I
ENH
Ver: 1.2
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G961
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
)
SOT-89-5................................................128C/W
Thermal Resistance Junction to Case, (
Jc
)
SOT-89-5.................................................19C/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
< 1A
---
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
=1A ---
0.4
0.6
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 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.
Note 2:
The maximum power dissipation is a function of the maximum junction temperature, T
Jmax
; total thermal resis-
tance,
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 voltage.
The measurement is made under conditions of low dissi-
pation 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 cur-
rent 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
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G961
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
(V
OUT
=1.8V)
0
10
20
30
40
50
60
10
100
1000
10000
100000
1000000
Frequency (Hz)
R
i
pple R
e
jection (dB
)
I
L
=10mA
V
IN
=4V
C
OUT
=10F
Vripple=224mV
I
L
=500mA
I
L
=1A
Line Transient Response
Short Circuit Current
Ripple Rejection
Load Transient Response
Overcurrent Protection Characteristics
Start-up
Ver: 1.2
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G961
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)
Qui
e
s
c
e
nt
Curr
ent
(m
A
)
0
100
200
300
400
500
600
700
0
200
400
600
800
1000
I
L
(mA)
Drop
out
V
o
l
t
a
ge (m
V
)
V
IN
=3.0V
V
IN
=5.0V
1.8
1.805
1.81
1.815
1.82
1.825
2.5
3.5
4.5
5.5
6.5
V
IN
(V)
Outpu
t
V
o
ltag
e
(V
)
1.784
1.789
1.794
1.799
1.804
1.809
1.814
1.819
1.824
-25 -15 -5
5 15 25 35 45 55 65 75 85
Temperature (C)
Out
put
V
o
l
t
age (
V
)
V
IN
=3.0V
V
IN
=5.0V
I
L
=10mA
Quiescent Current vs. Temperature
Dropout Voltage vs. I
L
Output Voltage vs. Temperature
Output Voltage vs. V
IN
T=25C
T=85C
T=-25C
T=25C
T=85C
T=-25C
0
0.5
1
1.5
2
2.5
0.5
1.5
2.5
3.5
4.5
PCB Top Copper Area (in
2
)
M
a
x
.
Di
s
s
i
pat
i
on P
o
w
e
r (W)
0
0.5
1
1.5
2
2.5
3
25
45
65
85
T
AMB
(C)
Ma
x. D
i
ssi
p
a
ti
o
n
Po
w
e
r
(
W
)
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
SOT-89-5 Max. Power Dissipation
vs. PCB Top Copper Area
T
AMB
= 25C ; Still Air
SOT-89-5 Max. Power Dissipation
vs. T
AMB
(still air)
( Different PCB Top Copper Area )
Unit:in
2
Ver: 1.2
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G961
Global Mixed-mode Technology Inc.
Recommended Minimum Footprint
SOT-89-5
Ver: 1.2
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G961
Global Mixed-mode Technology Inc.
Package Information
SOT-89-5 Package
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN MAX MIN MAX
A 4.40 4.60 0.173 0.181
B 4.05 4.25 0.159 0.167
C 1.50 1.70 0.059 0.067
D 1.30 1.50 0.051 0.059
E 2.40 2.60 0.094 0.102
F 0.80 ----- 0.031 -----
G
3.00 REF
0.118 REF
H
1.50 REF
0.059 REF
I 0.40 0.52 0.016 0.020
J 1.40 1.60 0.055 0.063
K 0.35 0.41 0.014 0.016
L
5 TYP
5 TYP
Taping Specification
PACKAGE Q'TY/REEL
SOT-89-5 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.
Feed Direction
SOT-89-5 Package Orientation
Feed Direction
SOT-89-5 Package Orientation
L
K
J
I
H
G
B
E
F
D
C
A
L
K
J
I
H
G
B
E
F
D
C
A
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