AAT2500M

400mA Step-Down Converter and 300mA LDO

4

2500M.2007.06.1.0

Electrical Characteristics

1

V

Symbol

Description

Conditions

Min

Typ

Max

Units

Power Supply

V

Input Voltage

2.7

5.5

V

V

INLDO

V

UVLO

Under-Voltage Lockout

V

2.7

V

V

2.35

V

I

Q

Quiescent Current

V

130

µA

I

SHDN

Shutdown Current

V

1.0

µA

Step-Down Converter

V

FB

Feedback Voltage Tolerance

No Load, T

0.591

0.609

V

`I

-3

+3

%

I

LXLEAK

LX Reverse Leakage Current

V

-1.0

1.0

µA

I

FB

Feedback Leakage

V

0.2

µA

I

LIM

P-Channel Current Limit

1.2

A

R

DS(ON)H

High Side Switch On Resistance

0.4

Ω

R

DS(ON)L

Low Side Switch On Resistance

0.25

Ω

∆V

Load Regulation

I

0.25

%

∆V

Line Regulation

V

0.3

%

F

OSC

Oscillator Frequency

1.8

MHz

T

S

Start-Up Time

From Enable to Output Regulation

120

µs

LDO (V

V

OUT

Output Voltage Tolerance

No Load, 25°C

3.24

3.30

3.36

V

V

OUT

Output Voltage Range

I

-3

3

%

V

IN

Input Voltage

V

5.5

V

V

DO

2

I

OUT

Output Current

300

mA

I

LIM

Current Limit

1A

V

DO

Dropout Voltage

3

I

160

240

mV

∆V

Load Regulation

I

1.2

%

∆V

Line Regulation

V

0.6

%

T

S

Start-Up Time

From Enable to Output Regulation

100

µs

Logic Signals

V

EN(L)

Enable Threshold Low

0.6

V

V

EN(H)

Enable Threshold High

1.5

V

I

EN(H)

Enable Current Consumption

-1.0

1.0

µA

T

SD

Over-Temperature Shutdown

150

°C

Threshold

T

HYS

Over-Temperature Shutdown

15

°C

Hysteresis

1. Specification over the -40°C to +85°C operating temperature ranges is assured by design, characterization and correlation with sta-

tistical process controls.

2. To calculate the minimum LDO input voltage, use the following equation: V

3. V