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参数资料
| 型号： | GT2113 |
| 厂商： | GTM CORPORATION |
| 英文描述： | 300 mACMOS POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 300 mACMOS正电压稳压器 |
| 文件页数： | 3/7页 |
| 文件大小： | 531K |
| 代理商： | GT2113 |
3/7
ISSUED DATE :2006/04/18
REVISED DATE :
Ordering Information ( contd. )
Part Number
Marking
Output Voltage
Part Number
Marking
Output Voltage
GT2113-15
3A152
XXXX
1.5V
GT2113-18
3A182
XXXX
1.8V
GT2113-25
3A252
XXXX
2.5V
GT2113-27
3A272
XXXX
2.7V
GT2113-28
3A282
XXXX
2.8V
GT2113-29
3A292
XXXX
2.9V
GT2113-30
3A302
XXXX
3.0V
GT2113-31
3A312
XXXX
3.1V
GT2113-33
3A332
XXXX
3.3V
GT2113-34
3A342
XXXX
3.4V
GT2113-35
3A352
XXXX
3.5V
GT2113-36
3A362
XXXX
3.6V
GT2113-37
3A372
XXXX
3.7V
GT2113-38
3A382
XXXX
3.8V
GT2113-50
3A502
XXXX
5.0V
GT2113-2H
3A2H2
XXXX
2.85V
Detailed Description
The GT2113 family of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, thermal shutdown and Power Good detection circuitry.
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
150 : , or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 : .
The GT2113 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GT2113 also incorporates current fold-back to reduce power dissipation when
the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces
the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts.
External Capacitors
The GT2113 is stable with an output capacitance to ground of 2.2 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 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
The Enable pin normally floats high. When actively, 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.
Power Good
The GT2113 includes the Power Good feature. When the output is not within ±15% of the specified voltage, it
pulls low. This can occur under the following conditions:
1) Input Voltage too low.
2) During Over-Temperature.
3) During Over-Current.
4) If output is pulled up.
(Note: PG pin is an open-drain output.)
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