Electrical Characteristics

1

T

Symbol

Description

Conditions

Min

Typ

Max

Units

Step-Down Converter

V

IN

Input Voltage

2.7

5.5

V

V

2.6

V

V

UVLO

UVLO Threshold

Hysteresis

100

mV

V

1.8

V

V

OUT

Output Voltage Tolerance

I

-3.0

+3.0

%

V

V

OUT

Output Voltage Range

Fixed Output Version

0.6

4.0

V

Adjustable Output Version

2

0.6

2.5

I

Q

Quiescent Current

No Load, 0.6V Adjustable

25

50

µA

Version

I

SHDN

Shutdown Current

EN = AGND = PGND

1.0

µA

I

LIM

P-Channel Current Limit

600

mA

R

DS(ON)H

High Side Switch On Resistance

0.45

Ω

R

DS(ON)L

Low Side Switch On Resistance

0.40

Ω

I

LXLEAK

LX Leakage Current

V

1µA

EN = GND

∆V

Linereg

Line Regulation

V

0.2

%/V

V

OUT

Out Threshold Voltage Accuracy

0.6V Output, No Load

597

600

615

mV

T

I

OUT

Out Leakage Current

0.6V Output

0.2

µA

R

OUT

Out Impedance

>0.6V Output

250

k

Ω

F

OSC

Oscillator Frequency

T

0.7

1.0

1.5

MHz

T

SD

Over-Temperature Shutdown Threshold

140

°C

T

HYS

Over-Temperature Shutdown Hysteresis

15

°C

EN

V

EN(L)

Enable Threshold Low

0.6

V

V

EN(H)

Enable Threshold High

1.4

V

I

EN

Input Low Current

V

-1.0

1.0

µA

AAT1143

1MHz 400mA Step-Down Converter

4

1143.2005.09.1.7

1. The AAT1143 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured

by design, characterization, and correlation with statistical process controls.

2. For adjustable version with higher than 2.5V output, please consult your AnalogicTech representative.