PT7M84112825TT6E datasheet, PDF

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PT7M84112825TT6E: DescriptionRegulator; CategoryPower/power management The power supply circuit; File Size574KB，11 Pages; ManufacturerPericom Technology Inc

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PT7M84112825TT6E Overview

Regulator

PT7M84112825TT6E Parametric

Parameter Name	Attribute value
Objectid	113558408
package instruction	,
Reach Compliance Code	unknown
ECCN code	EAR99

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Data Sheet

PT7M8411

Dual LDO Regulator

Features

•

Description

The PT7M8411 series are highly accurate, dual, low

noise, CMOS LDO voltage regulators. Performance

features of the series include low output noise, high

ripple rejection ratio, low dropout and very fast turn-on

times. The PT7M8411 includes a reference voltage

source, error amplifiers, driver transistors, current

limiters and phase compensators internally. The output

voltage for each regulator is set independently by

trimming. Voltages are selectable in 100mV steps within

a range of 1.2V to 3.3V includes 2.85V. The PT7M8411

series are also fully compatible with low ceramic

capacitors, reducing cost and improving output stability.

This high level of output stability is maintained even

during frequent load fluctuations, due to the excellent

transient response performance and high PSRR achieved

across a broad range of frequencies. The EN function

allows the output of each regulator to be turned off

independently, resulting in greatly reduced power

consumption.

Dual LDO Outputs (300mA/300mA)

Dropout Voltage：210mV@300mA

Operating Voltage Range：1.8V---5.5V

Output Voltage Range：1.2V---3.3V(100 mV Step)

Highly Accurate：±2%

Low Power Consumption：55µA/LDOs (TYP)

Standby Current：Less than 0.1µA (TYP)

High Ripple Rejection：75dB@1kHZ

Thermal Shutdown Protection

Current Limit Protection

Operating Temperature Range：-40℃~+85℃

Low ESR Capacitor compatible：Ceramic capacitor

Tiny TSOT-23-6L Package

Ordering Information

Part Number

PT7M8411①②③④TT6E

Package

Lead free and Green

TSOT23-6L

Applications

•

Note:

“

①②③④

” refer to different functions. See below

Table 1.

MP3/MP4/PMP

Mobile Phone

PHS RF and Baseband

DSC CMOS Sensor

GPS RF

WLAN

Table 1 Option Definition Table

Designator

Symbol

Description

Internally set sequential number relating output voltage of regulator1

①②

12-33, 2A

③④

12-33, 2A

Regulator 1 Output Voltage Range: 1.2V~ 3.3V, 2.85V the detail is in table2

Internally set sequential number relating output voltage of regulator2

Regulator 2 Output Voltage Range: 1.2V~ 3.3V, 2.85V the detail is in table2

PT0298 (05/11)

Ver: 1

Data Sheet

PT7M8411

Dual LDO Regulator

Pin Assignment

VOUT2

GND

EN2

TSOT23-6L

PT7M8411

VOUT1

VIN

EN1

Pin Description

I/O

Name

VOUT2

GND

EN2

EN1

VIN

VOUT1

Descriptions

Output of Regulator 2. Bypass with a 1µF ceramic capacitor (X5R/X7R) to GND.

Ground.

ON/OFF Control of Regulator 2.

ON/OFF Control of Regulator 1.

Regulators Supply Input. Supply voltage can range from 1.8V to 5.5V. Bypass with a 1µF ceramic

capacitor (X5R/X7R) to GND.

Output of Regulator 1. Bypass with a 1µF ceramic capacitor (X5R/X7R) to GND.

Functional Description

(Refer to Block Diagram)

Output voltage control

The P-Channel MOSFETs which are connected to the VOUT1 and VOUT2 pins, are then driven by the subsequent output signal.

The output voltages at the VOUT1 and VOUT2 pins are controlled and stabilized by a system of negative feedback. The current

limit circuit operates in relation to the level of output current. Further, the IC's internal circuitry can be shutdown via the EN1 and

EN2 pin's signal.

Low ESR Capacitors

With the PT7M8411 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase compensation

circuit is built-in. In order to ensure the effectiveness of the phase compensation, we suggest that output capacitors are connected

as close as possible to the output pins (VOUT1 and VOUT2) and the GND pin. Please use an output capacitor with a capacitance

value of 1µF. Also, please connect an input capacitor of 1µF between the VIN pin and the GND pin in order to ensure a stable

power input.

Current Limiter

The PT7M8411 series includes a fixed current limiter circuit & a foldback circuit. When the load current reaches the current limit

level, the fixed current limiter circuit operates and output voltage drops.

Thermal Overload Protection

Thermal overload protection limits total power dissipation in the PT7M8411. When the junction temperature exceeds TJ =+170°C,

a thermal sensor turns off the pass transistor, allowing the device to cool. The thermal sensor turns the pass transistor on again

after the junction temperature cools by -40°C, resulting in a pulsed output during continuous thermal overload conditions.

Thermal overload protection protects the PT7M8411 in the event of fault conditions. For continuous operation, do not exceed the

absolute maximum junction-temperature rating of TJ=+125°

EN Pins

The IC's internal circuitry can be shutdown via the signal from the EN1 and EN2 pins with the PT7M8411 series. In shutdown

mode, output at the VOUT1 and VOUT2 pins will be pulled down to the GND level. For to protecting the system, the PT7M8411

have a quick-discharge function. The operational logic of the IC's EN1 and EN2 pins are selectable.

NOTE ON USE

Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be exceeded.

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 IN and GND wiring in particular. Please wire the input capacitor and the output capacitors

as close to the IC as possible.

PT0298 (05/11)

Ver: 1

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