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G5E1286 데이터시트 PDF




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부품번호 G5E1286 기능
기능 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
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G5E1286 데이터시트, 핀배열, 회로
www.DataSheet4U.com
ISSUED DATE :2005/07/11
REVISED DATE :2006/03/29B
G5E1286
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Description
The G5E1286 is 1.5A regulator with extremely low dropout voltage. This product is specifically designed to
provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies
where high efficiency of the switch can be achieved without the cost and complexity associated with switching
regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply.
Features
0.5V maximum dropout voltage at 1.5A load current
Built-in thermal shutdown
Output current limiting
Adjustable or fixed output voltage 1.5V, 1.8V, 2.5V, 3.3V, 5.0V
Fast transient response
Good noise rejection
Package Dimensions
Typical Application
REF.
A
b
c
D
E
L4
Millimeter
Min. Max.
4.40 4.80
0.76 1.00
0.36 0.50
8.60 9.00
9.80 10.4
14.7 15.3
REF.
L5
c1
L
e
L1
Ø
Millimeter
Min. Max.
6.20 6.60
1.25 1.45
13.25 14.25
1.70 REF.
2.60 2.89
3.71 3.96
Block Diagram
Pin Descriptions
Name
I/O
Adj (Gnd)
Vsense
I
Vin I
Vctrl
Vout
I
O
Description
A resistor divider from this pin to the Vout pin and ground sets the output voltage. (Gnd only for fixed mode)
The pin is the positive side of the reference that allows remote load sensing to achieve excellent load
regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability.
The input pin of regulator. Typically a large storage capacitor is connected from this pin to ground to insure
that the input voltage does not sag below the minimum dropout voltage during the load transient response.
This pin must always be higher than Vout in order for the device to regulate.
This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. This
pin must always by higher than the Vout pin in order the device to regulate. A minimum of 100uF capacitor
must be connected from this pin to ground to insure stability.
The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground to
insure stability.
G5E1286
Page: 1/4




G5E1286 pdf, 반도체, 판매, 대치품
ISSUED DATE :2005/07/11
REVISED DATE :2006/03/29B
Stability
The G5E1286-XX requires the use of an output capacitor as part of the frequency compensation in order to make the
regulator stable. Typical designs for the microprocessor application use standard electrolytic with typical ESR in the range
of 50 to 100m and an output capacitance of 100uF to 1000uF. Fortunately as the capacitance increases, the ESR
decreases resulting in a fixed RC time constant. The G5E1286-XX takes advantage of the phenomena in making the
overall regulator loop stable. For most applications a minimum of 100uF aluminum electrolytic capacitor insures both
stability and good transient response.
Thermal Design
The G5E1286-XX incorporates an internal thermal shutdown that protects the device when the junction temperature
exceeds the maximum allowable junction temperatures. Although this device can operate with junction temperatures in the
range of 150 , it is recommended that the selected heat sink be chosen such that during maximum continuous load
operation, the junction temperature is kept below this number.
Important Notice:
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM.
GTM reserves the right to make changes to its products without notice.
GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems.
GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
Head Office And Factory:
Taiwan: No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C.
TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785
China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China
TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165
G5E1286
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