Global Mixed-mode Technology G962 Service Manual
查询G962供应商
Global Mixed-mode Technology Inc.
2A 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 @2A
Enable pin
10µA quiescent current in shutdown
Output recovery mode in OTP
Connect ADJ to GND for fixed output mode
TO-252-5 Package
Applications
Battery powered systems
Motherboards
Peripheral cards
Set Top Boxes
Notebook Computers
G962
General Description
The G962 is a high performance positive voltage
regulator designed for use in applications requiring
very low dropout voltage at up to 2 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 G962 provides excellent regulation
over variations in line, load and temperature.
The TO-252-5 is available with 1.5V, 1.8V and 2.5V
internally preset outputs that are also adjustable using
external resistors.
Ordering Information
ORDER NUMBER
G962-15ADJTJU G962-15ADJTJUf G962-15 -40°C ~ +85°C TO-252-5
G962-18ADJTJU G962-18ADJTJUf G962-18 -40°C ~ +85°C TO-252-5
G962-25ADJTJU G962-25ADJTJUf G962-25 -40°C ~ +85°C TO-252-5
Note: TJ:TO-252-5
U : Tape & Reel
e.g. 18 denotes the 1.8V output voltage.
ORDER NUMBER
(Pb free)
MARKING TEMP. RANGE PACKAGE
Pin Configuration Typical Application Circuit
Top View
Top View
1
1
2
2
3
3
45
45
VIN GND
VIN GND
EN
EN
TO-252-5
TO-252-5
VO
VO
ADJ
ADJ
VEN
VEN
VIN
VIN
VO
VO
C1
C1
47µF
47µF
C2
C2
100µF
100µF
R3
R3
R1
R1
R2
R2
G962
VEN
VEN
VIN
VIN
VO
VO
ADJ
ADJ
G962
I
I
ENH
ENH
GND
GND
Ver: 0.8 Preliminary
Apr 01, 2005
1.2 (R1+R2)
1.2 (R1+R2)
VO =
VO =
R2=12kΩ is recommended
R2=12kΩ is recommended
R3 should be connected for current I
R3 should be connected for current I
restriction as VEN> VIN+0.3V
restriction as VEN> VIN+0.3V
R2
R2
1
Volts
Volts
ENH
ENH
TEL: 886-3-5788833
http://www.gmt.com.tw
Absolute Maximum Ratings (Note 1)
Input Voltage……………………………….……………7V
V
Voltage……………………………….………VIN+0.3V
EN
Power Dissipation Internally Limited (Note 2)
Global Mixed-mode Technology Inc.
Operation Conditions (Note 1)
Input Voltage……………………………………2.2V ~7V
Temperature Range……………......-40°C ≤T
G962
≤ +85°C
A
Maximum Junction Temperature.…..………..……150°C
Storage Temperature Range…..….-65°C ≤T
≤ +150°C
J
Reflow Temperature (Soldering, 10 sec)……..…260°C
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
ESD Rating (Human Body Model)……….…………2kV
Electrical Characteristics
VEN=VIN, VIN =5V, IO = 0.5A, CIN = 4.7µF, C
PARAMETER SYMBOL CONDITION MIN TYP MAX UNIT
Output Voltage VO VIN=VO +0.7V, IO=10mA -2 VO 2 %
Line Regulation VO+0.7V < VIN < 5.5V, IO=10mA --- 0.2 2 %
Load Regulation 10mA < IO < 2A --- 0.8 2 %
Quiescent Current IQ
Ripple Rejection fi=120Hz, 1V
Dropout Voltage VD IO=2A --- 0.7 0.85 V
Short Circuit Current --- 0.8 --- A
Over Temperature (Note 4) --- 150 --- °C
VEN Voltage High V
VEN Voltage Low V
VEN Bias Current Low I
ADJ Reference Voltage V
ADJ Pin Threshold --- 0.2 --- V
ENH
ENL
ENL
REF
VIN=3.3V,VEN=VIN --- 1.7 2.5 mA
V
Output Active 1.6 --- --- V
Output Disabled --- --- 0.4 V
VEN=0.4V --- --- 20 µA
VIN=2.2V, 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
resistance, θ
temperature is (T
, and ambient temperature TA. The maximum allowable power dissipation at any ambient
JA
jmax-TA)
/ θJA. If this dissipation is exceeded, the die temperature will rise above 150°C
and IC will go into thermal shutdown.
Note3:
Note4:
Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
The over temperature point is guarantee by design.
=10µF, TA = TJ = 25°C unless otherwise specified (Note 3)
OUT
=3.3V,VEN=0V --- 16 35 µA
IN
, IO=100mA --- 55 --- dB
P-P
ADJ=VOUT
, IO=10mA 1.176 1.2 1.224 V
; total thermal
Jmax
Definitions
Dropout Voltage
The input/output voltage differential at which the regulator 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 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 aver-
age chip temperature is not significantly affected.
Load Regulation
The change in output voltage for a change in load
Ver: 0.8 Preliminary
Apr 01, 2005
current 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.
Output Capacitor for Stable Condition
The G962 can be stable for X5R MLCC capacitor larger than 10µF or POSCAP capacitor larger than 47µF.
TEL: 886-3-5788833
http://www.gmt.com.tw
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