AAT2687 参数 Datasheet PDF下载

PRODUCT DATASHEET

AAT2687

SystemPower

TM

PMIC Solution for 24V Systems with 2 High Performance Step-Down Converters

Electrical Characteristics

1

V

IN1

= 12.0V, V

IN2

=3.3V; T

A

= -40°C to 85°C, unless noted otherwise. Typical values are at T

A

= 25°C.

Symbol

Description

Conditions

Min

6.0

V

IN1

Rising

V

IN1

Hysteresis

V

IN1

Falling

300

3.0

1.5

0.591

-2.5

5.5

0.609

2.5

Typ

Max

24.0

5.0

Units

V

V

mV

V

V

V

%

%/V

%/A

Channel 1: Step-Down Converter

V

IN1

Input Voltage

V

UVLO1

UVLO Threshold

V

OUT1

Output Voltage Range

V

FB1

Feedback Pin Voltage

T

A

= 25°C

V

OUT

Output Voltage Accuracy

I

OUT1

= 0A to 4.5A

ΔV

OUT/

V

OUT

Line Regulation

V

IN1

= 6V to 24V, V

OUT1

= 3.3V, I

OUT1

= 4.5A

ΔV

IN

ΔV

OUT/

V

OUT

Load Regulation

V

IN1

= 12V, V

OUT1

= 3.3V, I

OUT1

= 0A to 4.5A

ΔI

OUT

I

Q1

Quiescent Current

V

EN1

= High, No load

I

SHDN1

Shutdown Current

V

EN1

= Low, V

L1

= 0V

V

OCP1

Over-Current Offset Voltage

V

EN1

= High, V

IN1

= 6.0V to 24.0V, T

A

= 25°C

I

LX1

LX Pin Leakage Current

V

IN1

= 24.0V, V

EN1

= Low

D

MAX

Maximum Duty Cycle

T

ON(MIN)

Minimum On-Time

V

IN1

= 6.0 to 24.0V

High Side On-Resistance

V

L1

= 4.5V

R

DSON(H)

F

OSC1

Oscillator Frequency

F

FOLDBACK1

Short Circuit Foldback Frequency Current Limit Triggered

T

S1

Start-Up Time

From Enable Channel 1 to Output Regulation

Channel 2: 600mA Linear Low Dropout (LDO) Regulator

V

IN2

Input Voltage

V

DO2

Dropout Voltage

98% x V

OUT2(NOM)

, I

OUT2

= 600mA

I

Q2

Quiescent (Ground) Current

No load

I

SHDN2

Shutdown Current

V

EN2

= GND

I

OUT2

= 1mA to 600mA, V

IN2

= 2.7V to 5.5V,

T

A

= 25°C

Output Voltage Tolerance

V

OUT2(TOL)

I

OUT2

= 1mA to 600mA, V

IN2

= 2.7V to 5.5V,

T

A

= -40°C to 85°C

Output Noise

BW = 300Hz to 50kHz

e

N

1kHz

PSRR

Power Supply Rejection Ratio

I

OUT2

= 10mA

10kHz

1MHz

I

LIMIT2

Current Limit

Enable Start-Up Delay

From Enable Channel 2 to Output Regulation

T

S2

Over-Temperature, EN Logic

Over-Temperature Shutdown

Threshold

T

SD1,2

Over-Temperature Shutdown

Hysteresis

V

EN1,EN2(L)

Enable Threshold Low

Enable Threshold High

V

EN1(H)

V

EN2(H)

Enable Threshold High

I

EN1,EN2

Input Low Current

0.600

0.06

0.18

0.6

80

-1.0

100

85

100

35

490

100

2.5

35.0

120

1.0

350

650

mA

μA

mV

μA

%

ns

mΩ

kHz

kHz

ms

V

mV

μA

μA

%

%

μV

RMS

dB

mA

μs

°C

°C

2.7

1000

70

-2.0

-3.5

250

67

47

45

800

15

135

15

5.5

1300

125

1.0

+2.0

+3.5

700

0.6

2.5

1.4

-1.0

1.0

V

V

V

μA

1. The AAT2687 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.

4

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