Global Mixed-mode Technology Inc.
G9966
3A Low Dropout Regulator with Enable
Features
1.5V, 1.8V, 2.5V, 3.3V and Adjustable Outputs
Over Current and Over Temperature Protection
Output Current 3A
Enable Pin
20µA Quiescent Current in Shutdown
TO-263-5 Package
General Description
The G9966 is a high performance positive voltage
regulator designed for use in applications requiring
very low dropout voltage at up to 3 Amps. Since it has
superior dropout characteristics compared with regular
LDOs, it can be used to supply 2.5V on motherboards
or 1.5V, 1.8V, 3.3V on peripheral cards from the power
supply thus allowing the elimination of costly heatsinks.
An enable pin further reduces power dissipation while
shut down. The G9966 provides excellent regulation
over variations in line, load and temperature. It pro-
vides over current and over temperature protection
functions.
The G9966 is available with 1.5V, 1.8V, 2.5V, 3.3V
and adjustable outputs in TO-263-5 package.
Applications
Battery Powered Systems
Motherboards
Peripheral Cards
Network Cards
Set Top Boxes
Notebook Computers
Ordering Information
ORDER
NUMBER
G9966-15TGU
G9966-18TGU
G9966-25TGU
G9966-33TGU
G9966-ADJTGU
MARKING
G9966-15
G9966-18
G9966-25
G9966-33
G9966
TEMP.
RANGE
-40°C ~ +85°C
-40°C ~ +85°C
-40°C ~ +85°C
-40°C ~ +85°C
-40°C ~ +85°C
PACKAGE
(Pb free)
TO-263-5
TO-263-5
TO-263-5
TO-263-5
TO-263-5
Pin Configuration
G9966-XX
Typical Application Circuit
G9966-XX
VEN
VIN
VO
VEN
VIN
VO
GND
C1
220µF
1
2
3
4
5
C2
220µF
VEN VIN GND VO N.C.
TO-263-5
G9966-ADJ
VEN
VIN
VO
R1
C1
220µF
1
2
3
4
5
C2
220µF
R2
G9966-ADJ
VEN
VIN
VO
ADJ
GND
VEN VIN GND VO ADJ
TO-263-5
VO =
1.2 (R1+R2)
Volts
R2
R2=12kΩ is recommended
Ver: 0.6 Preliminary
May 19, 2006
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
)
TO-263-5
(1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
Thermal Resistance Junction to Case, (θ
Jc
)
TO-263-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..5°C/W
ESD Rating (Human Body Model) . . . . . . . . .. . . .2kV
Note
(1)
: See Recommended Minimum Footprint
G9966
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
= C
OUT
= 220µF, T
A
= T
J
= 25°C unless otherwise specified (Note 3)
PARAMETER
Supply Voltage
Output Voltage
Line Regulation
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
G9966-15 V
IN
= 2.5V, 10mA < I
OUT
< 3A
G9966-18 V
IN
= 3.8V, 10mA < I
OUT
< 3A
G9966-25 V
IN
= 5V, 10mA < I
OUT
< 3A
G9966-33 V
IN
= 5V, 10mA < I
OUT
< 3A
V
IN
= 5V
fi = 120Hz, 1V
P-P
, I
O
= 100mA
G9966-15
ΔV
OUT
= 2%, I
OUT
= 3A
G9966-18
ΔV
OUT
= 2%, I
OUT
= 3A
G9966-25
ΔV
OUT
= 2%, I
OUT
= 3A
G9966-33
ΔV
OUT
= 2%, I
OUT
= 3A
MIN
2.2
-2
---
TYP
---
V
O
0.3
MAX
5.5
2
2
UNIT
V
%
%
Load Regulation
---
1
2
%
Quiescent Current
Ripple Rejection
I
Q
---
---
---
---
---
---
---
---
1.6
---
---
---
1.176
---
3
55
0.85
0.8
0.6
0.55
1
150
---
---
---
20
1.2
0.2
10
---
1
0.95
0.8
0.7
---
---
---
0.4
20
35
1.224
---
mA
dB
Dropout Voltage
V
D
V
Short Circuit Current
Over Temperature
V
EN
Voltage High
V
EN
Voltage Low
V
EN
Bias Current Low
Shutdown Current
ADJ Reference Voltage
ADJ Pin Threshold
V
ENH
V
ENL
I
ENL
V
REF
Output Active
Output Disabled
V
EN
= 0.4V
V
IN
= 5V, V
EN
= 0V
V
IN
=2.2V, V
ADJ
=V
OUT
, I
O
=10mA
A
°C
V
V
µA
µA
V
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.
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.
Ver: 0.6 Preliminary
May 19, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
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.
G9966
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: 0.6 Preliminary
May 19, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
V
iN
-V
OUT
=3V, C
IN
= 220µF, C
OUT
=220µF, T
A
= 25°C, unless otherwise noted.
Line Transient Response
G9966
Load Transient Response
Short Circuit Current
70
60
Ripple Rejection (dB)
Ripple Rejection
I
L
=1A
50
40
30
20
10
0
10
I
L
=2A
I
L
=3A
100
1000
10000
100000 1000000
Frequency (Hz)
G9966-33 Overcurrent
Protection Characteristics
G9966-33 Start-up
Ver: 0.6 Preliminary
May 19, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(continued)
G9966-33 Start-up
G9966
G9966-18 Overcurrent Protection Characteristics
G9966-18-Start-up
G9966-18-Start-up
G9966 Max. Power Dissipation
vs. PCB Top Copper Area
4.5
Max. Dissipation Power (W)
G9966 Max. Power Dissipation vs. T
AMB
4.5
Max. Dissipation Power (W)
4
3.5
3
A=2.0
Unit:in
2
A=0.5
A=1.0
A=1.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0.5
1.5
2.5
3.5
2
2.5
2
1.5
1
0.5
A=2.5
A=3.0
A=3.5
A=4.0
A=4.5
A=5.0
0
4.5
25
35
45
55
T
AMB
PCB Top Copper Area (in )
65
(°C)
75
85
Ver: 0.6 Preliminary
May 19, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
5
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