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GSC2128 Datasheet(PDF) 6 Page - GTM CORPORATION

No. de Pieza. GSC2128
Descripción  CMOS LOW DROPOUT VOLTAGE REGULATOR
Descarga  6 Pages
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Fabricante  GTM [GTM CORPORATION]
Página de inicio  http://www.gtm.com.tw
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GSC2128 Datasheet(HTML) 6 Page - GTM CORPORATION

   
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ISSUED DATE :2005/06/21
REVISED DATE :2005/10/04B
Detailed Description
The GSC2128 series of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision
reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds
140 : , or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 : .
The GSC2128 behaves like a current source when the load reaches 2.2A. However, if the load impedance
drops below 0.3 , the current drops back to 600mA to prevent excessive power dissipation. Normal operation
is restored when the load resistance exceeds 0.75 .
External Capacitors
The GSC2128 is stable with an output capacitance to ground of 4.7 F or greater. Ceramic capacitors have
the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit
the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are
comparatively expensive. One option is to parallel a 0.1 F ceramic capacitor with a 10 F Aluminum Electrolytic.
The benefit is low ESR, high capacitance, and low overall cost.
A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor
should be at least 0.1 F to have a beneficial effect.
A third capacitor can be connected between the BY-PASS pin and GND. This capacitor can be a low cost
Polyester Film variety between the value of 0.001~0.01 F. A large capacitor improves the AC ripple rejection,
but also makes the output come up slowly. This “Soft” turn-on is desirable in some applications to limit turn-on
surges.
All capacitors should be placed in close proximity to the pins. A “Quiet” ground termination is desirable. This
can be achieved with a “Star” connection.
Enable
When pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state,
the quiescent current is less than 1 A. This pin behaves much like an electronic switch.
100k resistor is necessary between VEN source and EN pin when VEN is higher than VIN.
(Note: there is no internal pull-up for EN PIN)
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


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