ACE721A datasheet(3/8 Pages) ACE

3 / 8 page

ACE721A

Technology

1.2MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER

VER 1.3

Recommended Work Conditions

Item

Min

Typ

Max

Unit

Input Voltage (VIN)

2.5

5.5

Maximum Output Current (IOUT(MAX))

800

Operating Ambient Temperature (TA) -40

℃

Electrical Characteristics

VIN=VEN=3.6V, TA=25℃, unless otherwise specified. Specifications with boldface type apply over full operating

temperature range from -40 to 85℃

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Supply Current

ICC

VFB=0.55V

400

600

μA

Shutdown Supply Current

ISHDN

VEN=0V, VIN=5.5V

0.01

μA

Under Voltage Lockout

Threshold

VUVLO

Rising edge

2.27

Under Voltage Lockout

Hysteresis

VHUVLO

200

Feedback Bias Current

IFB

VFB=0.65V

-50

0.5

Feedback Voltage

VFB

IOUT=100mA

0.588 /

0.582

0.600

0.612 /

0.618

VIN=2.5V, VOUT=0.9V

800

VIN=3.6V, VOUT=1.2V

800

Maximum Output Current

IOUT(MAX)

VIN=4.6V, VOUT=3.3V

800

Switch Current Limit

ILIM

VFB=0.55V

0.85

1.15

Oscillator Frequency

fOSC

0.8

1.2

1.4

MHz

VENL

0.6

EN Pin Threshold

VENH

1.5

VEN=3.6V

-0.1

0.1

EN Pin Input Leakage Current

VEN=0V

-0.1

0.1

μA

Internal PFET On Resistance

RDSONP

ISW=100mA

0.44

Ω

Internal NFET On Resistance

RDSONN

ISW=-100mA

0.29

Ω

Maximum Duty Cycle

DMAX

VFB=0.55V

100

Soft-start Time

TSS

VEN=0V to VIN

IOUT=50mA

220

μS

Thermal Shutdown Threshold

TOTSD

160

℃

Thermal Shutdown Hysteresis

THYS

℃

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