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参数资料
| 型号： | GQ2171 |
| 厂商： | GTM CORPORATION |
| 元件分类： | 线性稳压 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正电压稳压器 |
| 文件页数： | 3/5页 |
| 文件大小： | 763K |
| 代理商： | GQ2171 |
3/5
ISSUED DATE :2005/12/12
REVISED DATE :
Ordering Information ( contd. )
Part Number
Marking
Output Voltage
Part Number
Marking
Output Voltage
GQ2171-15
1K152
XXXX
1.5V
GQ2171-18
1K182
XXXX
1.8V
GQ2171-20
1K202
XXXX
2.0V
GQ2171-25
1K252
XXXX
2.5V
GQ2171-27
1K272
XXXX
2.7V
GQ2171-28
1K282
XXXX
2.8V
GQ2171-2H
1K2H2
XXXX
2.85V
GQ2171-30
1K302
XXXX
3.0V
GQ2171-32
1K322
XXXX
3.2V
GQ2171-33
1K332
XXXX
3.3V
Detailed Description
The GQ2171 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
150 : , or the current exceeds 150mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 : .
The GQ2171 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GQ2171 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 GQ2171 is stable with an output capacitance to ground of 0.22 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.
A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should
be at least 1 F to have a beneficial effect.
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.
Shutdown
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.
Characteristics Curve
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