AAT2138 datasheet(4/18 Pages) SKYWORKS

4 / 18 page

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

202006C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013

AAT2138

High Current Step-Down Converter

with High-Precision Programmable Current Limited Load Switch

DATA SHEET

Electrical Characteristics1

VSYSIN = 5.0V, ENREG = SYSIN, ENSYS = AGND = PGND, TA = -40°C to 85°C unless otherwise noted. Typical values are

at TA = 25°C.

Symbol

Description

Conditions

Min Typ

Max

Units

VSYSIN

System Input Voltage Range

SYSIN, REGIN

2.7

5.5

VUVLO(SYSIN)

System Input Under-Voltage Lockout

SYSIN Rising

2.7

Hysteresis

0.2

VUVLO(REGIN)

Regulator Input Under-Voltage Lockout

REGIN Rising2

2.7

Hysteresis

0.2

VDIS(SYSIN)

Regulator Input Discharge Threshold

SYSIN Rising

3.15

Hysteresis

0.15

RDISCHRG

Discharge MOSFET On-Resistance

VSYSIN = VREGIN = 3.6V

TSHDN

Over-Temperature Shutdown Threshold

Hysteresis = 15°C

150

°C

No Load Supply Current

No Load Current; Not Switching

μA

ISHDN

Shutdown Current

ENREG = SW = GND,

System Input Load Switch

RDS(ON)

Load Switch On-Resistance

VSYSIN = 5.0V, TA = 25°C

mΩ

ΔISYSILIM

Current Limit Accuracy

RSET = 6.4kΩ, VREGIN < VUVLO(REGIN),

TA = 20°C to 85°C

-10

±5

Short-Circuit Current-Limit Threshold

RSET = 6.4kΩ, VREGIN < VUVLO(REGIN),

TA = 20°C to 85°C

400

Adjustable Current-Limit Range

TA = 25°C

0.5

tILIM

Current-Limit Response Time

μs

tSS(SYS)

Load Switch Soft-Start Period

1.5

VIH_ENSYS

ENSYS Input Logic Threshold High

1.5

VIL_ENSYS

ENSYS Input Logic Threshold Low

0.4

IENSYS

ENSYS Input Current

VEN = 0V or < VIN + 0.3V

-1.0

1.0

μA

Step-Down Regulator

VOUT

Output Voltage Range

3.0

VIN

IFB

FB Leakage Current

VFB = 0.65V

VFB

FB Regulation Threshold3

10mA Load, TA = +25°C

588

600

612

No Load, TA = -40°C to +85°C

582

600

618

ΔVOUT/IOUT

Load Regulation

IOUT = 0 to 2.5A, TA = 25°C

0.20

%/A

ΔVOUT/VIN

Line Regulation

VIN = 3.6V to 5.5V, VOUT = 3.3V,

TA = 25°C, IOUT = 10mA

0.10

0.30

%/V

ILIMPK

High-Side P-Channel MOSFET Current

Limit

3.0

4.0

RDS(ON)HI

High-Side P-Channel MOSFET On-

Resistance

VREGIN = 3.6V

mΩ

RDS(ON)LO

Low-Side N-Channel MOSFET On-

Resistance

VREGIN = 3.6V

mΩ

fOSC

Internal Oscillator Frequency

2.4

2.8

MHz

tSS(REG)

Step-Down Regulator Soft-Start Period4 COUT = 100μF1

tOFF

Minimum Off-time

VIH_ENREG

ENREG Input Logic Threshold High

1.5

VIL_ENREG

ENREG Input Logic Threshold Low

0.4

IENREG

ENREG Input Current

VEN = 0V or 5.5V < VIN + 0.3V

-1.0

1.0

μA

1. The AAT2138 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-

tion with statistical process controls.

2. Also used for Load Switch Current-Limit Fold-back Threshold

3. The regulated feedback voltage is tested in an internal test mode that connects VFB to the output of the error amplifier.

4. This time period will keep the regulator start-up current around 300mA to 400mA.

AAT2138 датащи(PDF) 4 Page - Skyworks Solutions Inc.

AAT2138 датащи(HTML) 4 Page - Skyworks Solutions Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

датащи скачать

ссылки URL