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参数资料
| 型号： | GSC2139 |
| 厂商： | GTM CORPORATION |
| 元件分类： | 线性稳压 |
| 英文描述： | 1.5A CMOS LOW DROPOUT VOLTAGE REGULATOR |
| 中文描述： | 1.5A的低压差稳压器的CMOS |
| 文件页数： | 3/7页 |
| 文件大小： | 531K |
| 代理商： | GSC2139 |
GSC2139
Page: 3/7
ISSUED DATE :2006/04/14
REVISED DATE :
Ordering Information ( contd. )
Part Number
Marking
Output Voltage
Part Number
Marking
Output Voltage
GSC2139-AD
9CAD2
XXXX
Adjustable
Detailed Description
The GSC2139 of COMS regulator contains 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 : .
External Capacitors
The GSC2139 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.
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.
Adjustable Version
The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to
5.0V. Vadj is trimmed to 1.242V and Vout is given by the equation:
VOUT=Vadj * (1+R1/R2)
Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1+R2 will
reduce stability. In general, R1 and R2 in the 10’s of k will produce adequate stability, given reasonable
layout precautions. To improve stability characteristics, keep parasitic on the ADJ pin to minimum, and lower
R1 and R2 values.
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