AIC1555 데이터 시트보기 (PDF) - Analog Intergrations

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AIC1555

Low-Noise Synchronous PWM Step-Down DC/DC Converter

Analog Intergrations 

AIC1555

ELECTRICAL CHARACTERISTICS

(VIN=+3.6V, TA=+25°C, SYNC/MODE =GND, SHDN =IN, unless otherwise specified.) (Note1)

PARAMETER

SYMBOL CONDITIONS

Input Voltage Range

Output Adjustment Range

VIN

VOUT

Feedback Voltage

VFB

MIN

2.5

VREF

0.731

TYP

0.75

MAX UNITS

6.5

V

VIN

V

0.769 V

Feedback Accuracy

-2.5

+2.5 %

Line Regulation

Load Regulation

Duty Cycle = 100% to 23%

IOUT = 0 to 700mA

+1

%

-1.3

%

FB Input Current

IFB VFB = 1.4V,

-50 0.01 50 nA

P-Channel On-Resistance PRDS(ON) ILX = 100mA

N-Channel On-Resistance NRDS(ON) ILX = 100mA

P-Channel Current-Limit

Threshold

(Note 2)

VIN = 3.6V

VIN = 2.5V

VIN = 3.6V

VIN = 2.5V

0.32 0.65

Ω

0.38

0.32 0.65

Ω

0.38

1

1.5 2.1

A

Quiescent Current

Shutdown Supply Current

SYNC/MODE = GND,

VFB = 1.4V, LX unconnected

SHDN = LX = GND, includes LX

leakage current

35 70 µA

0.1

1

µA

LX Leakage Current

Oscillator Frequency

SYNC Capture Range

fOSC

VIN = 5.5V, VLX = 0 or 5.5V

-20 0.1 20 µA

400 500 600 KHz

500

1000 KHz

Maximum Duty Cycle

Undervoltage Lockout

Threshold

dutyMAX

UVLO VIN rising, typical hysteresis is

85mV

100

%

1.9 2.0 2.1

V

Logic Input High

Logic Input Low

Logic Input Current

VIH SHDN , SYNC/MODE, LIM

VIL SHDN , SYNC/MODE, LIM

SHDN , SYNC/MODE, LIM

2

V

0.4

V

-1

0.1

1

µA

SYNC/MODE Minimum

Pulse Width

High or low

500

nS

Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating

temperature range are assured by design, characterization and correlation with Statistical Quality

Controls (SQC).

Note 2: Maximum specification is guaranteed by design, not production tested.

4

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