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Dual 600mA, 1MHz Step-Down DC/DC Converter

General Description

The AAT2511 is a member of AnalogicTech's Total

Power Management IC鈩?(TPMIC鈩? product fam-

ily. It is comprised of two 1MHz step-down con-

verters designed to minimize external component

size and cost. The input voltage ranges from 2.7V

to 5.5V. The output voltage ranges from 0.6V to the

maximum applied input voltage and is externally

adjustable.

Peak current mode control with internal compensa-

tion provides a stable converter with low ESR ceram-

ic output capacitors for extremely low output ripple.

Each channel has a low 25碌A(chǔ) quiescent operating

current, which is critical for maintaining high effi-

ciency at light load.

For maximum battery life, each converter's high-

side P-channel MOSFET conducts continuously

when the input voltage approaches dropout (100%

duty cycle operation).

Both regulators have independent input and

enable inputs.

The AAT2511 is available in a Pb-free, thermally-

enhanced 12-pin TDFN33 package, and is rated

over the -40擄C to +85擄C temperature range.

AAT2511

Features

鈥?/div>

SystemPower

鈩?/div>

Up to 97% Efficiency

25碌A(chǔ) Quiescent Current Per Channel

V

IN

Range: 2.7V to 5.5V

V

OUT

Range: 0.6V to V

IN

Output Current: 600mA

Low R

DS(ON)

0.4惟 Integrated Power Switches

Low Drop Out 100% Duty Cycle

1.0MHz Switching Frequency

Shutdown Current <1碌A(chǔ)

Current Mode Operation

Internal Reference Soft Start

Short-Circuit Protection

Fast Turn-On (100碌s Typical)

Over-Temperature Protection

3mm x 3mm, < 1mm high

TDFN33-12 Package

-40擄C to +85擄C Temperature Range

Applications

鈥?/div>

Cellular Phones

Digital Cameras

Handheld Instruments

Microprocessor/DSP Core/IO Power

PDAs and Handheld Computers

Portable Media Players

Typical Application

AAT2511 Efficiency

(V

IN

= 3.3V)

V

IN

C3

10渭F

12

100

U1

AAT2511

VIN1

EN1

LX1

FB1

SGND1

GND1

VIN2

EN2

LX2

FB2

SGND2

GND2

9

4

8

5

6

7

1

C8

0.1渭F

2.5V

L2

10渭H

R3

187k

95

1.8V

L1

4.7渭H

R1

118k

11

2

3

Efficiency (%)

90

85

80

75

70

65

60

0.1

1

10

100

1000

2.5V

1.8V

C1

10渭F

R2

59.0k

10

R4

59.0k

C2

10渭F

Load Current (mA)

2511.2006.05.1.4

1

型號(hào)

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