AAT2789 datasheet(4/22 Pages) ANALOGICTECH

部品番号	AAT2789

部品情報	Low Noise, High Frequency Dual Step-Down Converter

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AAT2789

Low Noise, High Frequency Dual Step-Down Converter

SystemPowerTM

PRODUCT DATASHEET

4

2789.2008.03.1.0

www .analogictech.com

AAT2789

Low Noise, High Frequency Dual Step-Down Converter

SystemPowerTM

PRODUCT DATASHEET

4

2789.2008.03.1.0

www .analogictech.com

Electrical Characteristics1

VIN = 3.6V, TA = -40°C to 85°C, unless noted otherwise. Typical values are at TA = 25°C.

Symbol

Description

Conditions

Min

Typ

Max

Units

Channel 1: 1700mA Step-Down Converter

VP1, VCC1

Input Voltage

2.7

5.5

V

VUVLO1

UVLO Threshold

VP1 Rising

2.4

V

VP1 Hysteresis

250

mV

VP1 Falling

1.7

V

VOUT1

Output Voltage Range

0.6

VP1

V

VOUT1(TOL)

Output Voltage Tolerance

IOUT1 = 0A to 1.7A; VP1 = 2.7V to 5.5V

-3.0

3.0

%

IQ1

Quiescent Current

No load, VEN1 = VP1, VEN2 = AGND

42

90

μA

ISHDN1

Shutdown Current

VEN1 = GND

1.0

μA

ILIM1

Current Limit

1800

mA

RDSON(H)1

High Side On-Resistance

120

mΩ

RDSON(L)1

Low Side On-Resistance

85

mΩ

ΔVLOADREG1

Load Regulation

IOUT1 = 0A to 1.7A

0.5

%

ΔVLINEREG1 /

ΔVP1

Line Regulation

VP1 = 2.7V to 5.5V

0.2

%/V

FOSC1

Oscillator Frequency

1.12

1.40

1.68

MHz

TS1

Start-Up Time

From Enable-1 to Output-1 Regulation

150

μs

Channel 2: 800mA Step-Down Converter

VP2, VCC2

Input Voltage

2.7

5.5

V

VUVLO2

UVLO Threshold

VP2 Rising

2.7

V

VP2 Hysteresis

100

mV

VP2 Falling

1.7

V

VOUT2

Output Voltage Range

0.6

VP2

V

VOUT2(TOL)

Output Voltage Tolerance

IOUT2 = 0A to 800mA, VP2 = 2.7V to 5.5V

-3.0

3.0

%

IQ2

Quiescent Current

No load, VEN2 = VP2, VEN1 = AGND

37

70

μA

ISHDN2

Shutdown Current

VEN2 = GND

1.0

μA

ILIM2

Current Limit

900

mA

RDSON(H)2

High Side On-Resistance

330

mΩ

RDSON(L)2

Low Side On-Resistance

275

mΩ

ΔVLOADREG2

Load Regulation

IOUT2= 0mA to 800mA

0.5

%

ΔVLINEREG2 /

ΔVP2

Line Regulation

VP2 = 2.7V to 5.5V

0.1

%/V

FOSC2

Oscillator Frequency

0.9

2.0

2.6

MHz

TS2

Start-Up Time

From Enable-2 to Output-2 Regulation

150

μs

Over-Temperature, EN Logic

TSD1,2

Over-Temperature Shutdown Threshold

140

°C

Over-Temperature Shutdown Hysteresis

15

°C

VEN1,2(L)

Enable Threshold Low

0.6

V

VEN1,2(H)

Enable Threshold High

1.4

V

IEN(1,2

Input Low Current

-1.0

1.0

μA

1. The AAT2789 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.

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