GQ2131 Datasheet, PDF (2/5 Pages) GTM CORPORATION – CMOS POSITIVE VOLTAGE REGULATOR

Fig 1. Typical Application Schematic
ISSUED DATE :2005/07/05
REVISED DATE :
Fig 2. Typical Application For Processor
VID Code Power Sequencing Schematic
Pin Description
Pin Number
1
2
3
4
5
Pin Name
VIN
Gnd
EN
PG
VOUT
Pin Function
Supply Input
Ground
Enable/Shutdown (Input): CMOS compatible input.
Logic high= enable; Logic low= shutdown. Do not leave open.
Power Good Output
Regulator Output
Ordering Information ( contd. )
Part Number
GQ2131-12
Marking
1C122
XXXX
Output Voltage
1.2V
Part Number
Marking
Output Voltage
Detailed Description
The GQ2131 of COMS regulator contains a PMOS pass transistor, voltage reference, error amplifier, over
-current protection, thermal shutdown and Power Good function.
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
150к, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120к.
The GQ2131 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GQ2131 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 GQ2131 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.
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.
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