PT7M8424BB2128TA6E datasheet, PDF

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PT7M8424BB2128TA6E: DescriptionRegulator; CategoryPower/power management The power supply circuit; File Size566KB，12 Pages; ManufacturerPericom Technology Inc

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Regulator

PT7M8424BB2128TA6E Parametric

Parameter Name	Attribute value
Objectid	114420309
package instruction	,
Reach Compliance Code	unknown
ECCN code	EAR99

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Data Sheet

PT7M8424

Dual LDO Regulators

Features

•

Description

The PT7M8424 series are highly accurate, dual, low

dropout voltage regulators with low noise, high ripple

rejection and low current consumption.

The PT7M8424 includes a reference voltage source, error

amplifiers, driver transistors, individual enable inputs,

current limit protections, short circuit protections,

thermal shutdown protection and internal phase

compensators.

The output voltage for each regulator is set by factory

trimming within a range of 1.2V to 4.5V in 100mV step.

The PT7M8424 series are stable with low ESR ceramic

capacitors. The PT7M8424 series are available in the

SOT23-6L package.

Output Current: 200mA or more

Dropout Voltage: 150mV@200mA

Operating Voltage Range: 1.8V-5.5V

Output Voltage Range: 1.2V-4.5V(100 mV Step)

High Accuracy:

±2.0%

Low Power Consumption: 55 µA

Standby Current: 0.1µA

High Ripple Rejection: 70dB@ 1kHz

Output Current-Limit Protection

Short Circuit Protection

Optional Auto Output Discharge

Operating Temperature Range: -40℃-+85℃

Low ESR Capacitor Compatible: Ceramic Capacitor

Thermal Shutdown Protection

Package: SOT23-6L

Application

•

Ordering Information

Part Number

PT7M8424①②③④⑤

⑥

TA6E

Package

Lead free and

Green SOT23-6L

Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)

Cordless phones and radio communication

equipment

Digital still cameras and video cameras

PDAs

MP3 players

Portable devices

Note: “

①②③④⑤

⑥

” refer to different functions. See

below Table 1.

Table 1 PT7M8424 Options

Designator Symbol

Description

High active with pull-down

①②:

resistor, with auto output discharge

Regulators

High active without pull-down

1 and 2

resistor, with auto output discharge

EN type

Low active with pull-up resistor,

with auto output discharge

Low active without pull-up resistor,

with auto output discharge

High active with pull-down

resistor, without auto output

discharge

High active without pull-down

resistor, without auto output

discharge

Low active with pull-up resistor,

without auto output discharge

Low active without pull-up resistor,

without auto output discharge

Designator

③④

Regulator 1

Output

voltage

Symbol

Description

12-45

Internally set sequential number

relating output voltage of regulator 1

Regulator 1 Output Voltage Range:

1.2~ 4.5V, the detail is in Table 2.

⑤

⑥

Regulator 2

Output

voltage

12-45

Internally set sequential number

relating output voltage of regulator

Regulator 2 Output Voltage Range:

1.2~ 4.5V, the detail is in Table 2.

PT0329 (02/09)

Ver: 0

Data Sheet

PT7M8424

Dual LDO Regulators

Functional Description

(Refer to Block Diagram)

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.

Thermal shutdown protection will

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.

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

) and the output capacitors (C

OUT1

, C

OUT2

) as close to the IC as possible.

Maximum Ratings

Storage Temperature………………………………………….. - 55

C to +125

Ambient Temperature with Power Applied..................................-40oC to +85oC

Input Voltage …………………………………………….…….................. +6.0V

Output Voltage …………………………………………….…- 0.3 to V

+0.3V

EN pin Voltage …………………………………………………………….+6.0V

DC Input/Output Current ………………………………………………...700mA

Power Dissipation………………………………………………………..250mW

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.

PT0329 (02/09)

Ver: 0

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