pt7m8402 Pericom Technology Inc, pt7m8402 Datasheet - Page 3

• Manufacturer Part Number: pt7m8402
• Description: Dual Ldo Regulators
• Manufacturer: Pericom Technology Inc

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Functional Description
Output Voltage
The divided output voltage is compared with the internal reference voltage by the error amplifier with internal phase compensator.
The output of the error amplifier then drives the P-channel MOSFET to maintain a stable and constant output voltage.
Low ESR Capacitors
The internal phase compensator maintains the stable output voltage with low ESR ceramic input and output capacitors. 1µF low
ESR (X5R/X7R) ceramic capacitors located as close as possible to the IC’s pins is recommended.
Current Limit , Short Circuit Protection and Thermal Shutdown Protection
Current limit protection is used to limit the output current when an overload condition occurs. As a result, the output voltage will
drop. When the overload condition is getting worse and the output voltage is close to ground, the short circuit protection will
further reduce the output current to a very low level to reduce the power dissipation in the IC.
turn off the output to reduce the power dissipation when the operation junction temperature exceeds 160°C.
EN Pins
The outputs of the two regulators can be controlled independently with the EN1 and EN2 pins. When a regulator is disabled, the
output voltage is discharged by internal feedback resistor and the circuitry of the regulator will not consume power. In the IC with
auto output discharge option, the output voltage is also discharged quickly by a pull-low transistor. For the IC with EN type of
“without pull-up/down resistor”, the EN pin should be connected to a “VIN” or a “GND” voltage as a floating input applied to
inverter input of the enable circuitry will increase the current consumption.
1.
2.
3.
Maximum Ratings
PT0314 (02/09)
Storage Temperature………………………………………….. - 55
Ambient Temperature with Power Applied..................................-40 o C to +85 o C
Input Voltage …………………………………………….…….................. +6.0V
Output Voltage …………………………………………….…- 0.3 to V
EN pin Voltage …………………………………………………………….+6.0V
DC Input/Output Current ………………………………………………...700mA
Power Dissipation………………………………………………………..250mW
NOTE ON USE
Please use this IC within the stated absolute maximum ratings.
Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output current.
Please keep the resistance low between VIN and GND wiring in particular.
Please wire the input capacitor (C
(Refer to Block Diagram)
IN
) and the output capacitors (C
o
C to +125
3
CC
+0.3V
OUT1
o
C
, C
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
OUT2
) as close to the IC as possible.
Thermal shutdown protection will
Dual LDO Regulators
Data Sheet
PT7M8402
Ver: 0