G1085.pdf 데이터시트 (총 8 페이지) - 파일 다운로드 G1085 데이타시트 다운로드

No Preview Available !

Global Mixed-mode Technology Inc.
G1085
3A Adjustable Low-Dropout Linear Regulator
Features
„ Available in Adjust Version
„ Space Saving TO-252 Package and TO-263
Package
„ Internal Short Circuit Current Limiting
„ Internal Over Temperature Protection
„ Output Current 3A
Applications
„ Post Regulation for Switching DC/DC Con-
verter
„ High Efficiency Linear Regulator
„ Battery Charger
„ Battery Powered Instrumentation
„ Motherboard
General Description
The G1085 is a low dropout linear regulator with a
dropout of 1.2V at 3A of load current. It is avail-
able in an adjustable version, which can set the
output from 1.25V to 5V with only two external
resistors.
The G1085 provides over temperature and over
current protection circuits to prevent it from being
damaged by abnormal operating conditions.
The G1085 is available in TO-252 package and
TO- 263 packages. A minimum of 100µF tantalum
electrolytic capacitor is required at the output to
improve the transient response and stability.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
TEMP.
RANGE
PACKAGE
1
G1085T43U
G1085T43Uf
G1085
-40°C to +85°C
TO-252
GND/ADJ
G1085T53U
G1085T53Uf
G1085
-40°C to +85°C
TO-263
GND/ADJ
* For other package types and pin options, please contact us at sales @gmt.com.tw
PIN OPTION
23
VOUT
VOUT
VIN
VIN
Order Number Identification
GXXXX XX X X
Packing Type
Pin Option
Package Type
Part Number
PACKAGE TYPE
T4: TO-252
T5: TO-263
PIN OPTION
12
3: GND/ADJ VOUT
3
VIN
PACKING
U & D: Tape & Reel Direction
T: Tube
Package Type
Top View
123
TO-252TO-263
Typical Application
[Note 4]: Type of COUT
IO
VIN VIN G1085 VOUT
GND/ADJ
VOUT
C1
100µF
R1
R2
COUT
100µF
Ver: 1.2
Sep 20, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1

No Preview Available !

Global Mixed-mode Technology Inc.
G1085
Absolute Maximum Ratings
(Note 1)
Input Voltage…………………………….………………7V
Power Dissipation Internally Limited
(Note 2)
Maximum Junction Temperature…...……………….150°C
Storage Temperature Range…..…-65°C TJ
+150°C
Reflow Temperature (soldering, 10sec)…………260°C
Thermal Resistance Junction to Ambient
TO-252(1)………………………………….………125°C/W
TO-263(1)………………………………….………100°C/W
Thermal Resistance Junction to Case
TO-252………….………………..………..….……10°C/W
TO-263…..………………………...……..…………6°C/W
ESD Rating (Human Body Model)……......................2kV
Operating Conditions
(Note 1)
(VIN-VADJ) Voltage………..…………...………..2.5V~5.5V
Temperature Range……………..….….-40°C TA 85°C
Note (1): See Recommended Minimum Footprint
Electrical Characteristics
Operating Conditions: VIN 7V, TA =TJ = 25°C unless otherwise specified. [Note3]
PARAMETER
Reference Voltage
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Adjust Pin Current Change
Minimum Load Current
Quiescent Current
Ripple Rejection
Temperature Stability
RMS Output Noise (% of VOUT)
Thermal Shutdown
Thermal Shutdown Hysteresis
CONDITION
VIN - VOUT = 2V, IOUT = 10mA
(VOUT + 1.5V) < VIN < 7V, IOUT = 10mA
(VIN - VOUT) = 2V, 10mA < IOUT <3A
VOUT = 2%, IOUT = 3A
(VIN - VOUT) = 2V
VIN - VOUT = 2V, 10mA < IOUT < 3A
1.5V < (VIN - VOUT) < 5.25V
VIN - VOUT = 2V
f = 120Hz, COUT = 10µF Tantalum,
(VIN - VOUT) = 3V, IOUT = 1A
VIN = 4V, IO =10mA
TA = 25°C, 10Hz < f < 10kHz, ILOAD = 10mA
Junction Temperature
MIN
1.225
---
---
---
---
---
10
---
---
---
---
---
---
TYP
1.250
0.5
0.04
1.3
5.4
0.15
---
80
48
0.3
0.007
150
30
MAX
1.275
1
0.5
1.4
---
---
---
150
---
---
---
---
---
UNIT
V
%
%
V
A
µA
mA
µA
dB
%
%
°C
°C
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, TJmax ; total thermal re-
sistance, θJA, and ambient temperature TA. The maximum allowable power dissipation at any ambient tem-
perature is Tjmax-TA / θJA. 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.
Ver: 1.2
Sep 20, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
2

No Preview Available !

Global Mixed-mode Technology Inc.
G1085
Definitions
Output Voltage
The G1085 provides an adjustable output voltage from
1.25V to 5V. with two external resistors. It can be for-
mulated as:
VOUT = 1.25V x (1+
IADJ = 80µA (TYP)
R2
R1
) + IADJ x R2
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 cur-
rent 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 average chip temperature is not significantly af-
fected.
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: 1.2
Sep 20, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3