RE025 Datasheet

IC型號(hào)：
RE025
PDF描述：
RE025 [Updated 2/03. 10 Pages] The RE025 is a Low Drop Out (...
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ETC

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Features

鈥?/div>

Low-noise Low Drop Out Voltage Regulator

Programmable at 2.8V or 2.9V Output Voltages

3V to 5.5V Supply Operation

30 mA Maximum Load Current

Power-down Mode Consumption Less Than 1 碌A(chǔ)

Macrocell for Integration into System-on-chip Products

More Than 70 dB (Typical) PSRR at 1 kHz

32碌 V

RMS

Output Noise

0.35 碌m CMOS Technology

Typical Application: Radio Section Supply in Mobile Terminals

Description

RE025 is a Low Drop Out (LDO) voltage regulator macrocell with programmable 2.8V

or 2.9V output voltages, rated for loads of up to 30 mA. It is designed to be integrated

with other analog cells, digital logic, microcontrollers, DSP cores and memory blocks

into system-on-chip products.

The circuit consists of a PMOS pass device, an error amplifier and a feedback resis-

tive network, sized to achieve the required closed loop gain. These blocks make up

the regulating loop. An over-current and short circuit protection circuit has been

included to limit the output current delivered by the regulator, thus avoiding destruction

in case of a short circuit.

An external reference voltage (bandgap voltage) is necessary for correct functionality.

The target reference voltage is 1.231V, delivered, for example, by BG019. Double

pads on the supply voltage V

BAT3A

BAT3AA

and output voltage V

PLLA

PLLAA

are used to

reduce the total output resistance. Current reference is generated inside the cell

through a circuit supplied by a 2.5V 鹵 0.1V regulated input voltage on V

SAUVC

. Remote

sense terminal V

PLLS

provides regulation at the load by connecting it to the output ter-

minal near a critical point to improve performance of the regulator (e.g., connecting

them at the package pin by double-bonding thus avoiding the bonding resistance influ-

ence). A ceramic capacitor of 2.2 碌F connected from V

PLLA

PLLAA

to ground is needed

as external compensation.

Figure 1.

Symbol

(1)

vsauvc

vbg

vbat3a

vbat3aa

Embedded ASIC

Macrocell:

Power

Management for

Mobile

Terminals (PM)

RE025

Programmable

2.8V or 2.9V

30 mA

Low-noise LDO

Voltage

Regulator

vplla

vpllaa

on3

vplls

trimldo3

vpllc

gnd3

Note:

1. Pin names are written as they appear on the user screen when the symbol is

opened in the design tool environment.

Rev. 2700B-PMGMT鈥?2/03

型號(hào)

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描述

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