FR9808 datasheet(5/13 Pages) FITIPOWER

Part #	FR9808

Description	21V, 4A, 500KHz Synchronous PWM-Buck DC/DC Converter

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Manufacturer	FITIPOWER [Fitipower Integrated Technology Inc.]

Direct Link	http://www.fitipower.com/en_US/index.asp

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5

FR9808-1.3-OCT-2012

FR9808

85T

fitipower integrated technology lnc.

Electrical Characteristics

(VIN=12V, TA=25°C, unless otherwise specified.)

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Input Supply Voltage

VIN

4.75

21

V

VIN Shutdown Supply Current

ISD

VEN=0V

1

μA

VIN Quiescent Supply Current

IDDQ

VEN=2V, VFB=1V

1.1

mA

Feedback Voltage

VFB

4.75V≦VIN≦21V

780

805

830

mV

High-Side MOSFET RDS(ON)

(Note2)

HSRDS(ON)

120

mΩ

Low-Side MOSFET RDS(ON)

(Note2)

LSRDS(ON)

20

m

Ω

MOSFET Leakage Current

ISW(Leak)

VEN=0V, VSW=0V

0

10

μA

High-Side

MOSFET

Current

Limit

(Note2)

ILIMIT

6.5

A

Maximum Duty Cycle

DMAX

VFB=0.7V

90

%

Oscillation frequency

FSW

350

500

650

KHz

Short-Circuit Oscillation Frequency

FSW(Short)

VFB=0.3V

150

KHz

Sync Frequency Range

FSYNC

300

800

KHz

Input UVLO Threshold

VUVLO(Vth)

VIN Rising

4

V

Under

Voltage

Lockout

Threshold

Hysteresis

VUVLO(Hys)

200

mV

EN/SYNC Input Low Voltage

VEN(L)

0.4

V

EN/SYNC Input High Voltage

VEN(H)

2.0

V

EN Input Current

IEN

VEN=2V

2

μA

VCC Regulator

VCC

4.5

V

Soft-Start Time

TSS

600

μs

Thermal Shutdown Threshold (Note 2)

TSD

160

°C

Note 2：Guarantee by design.

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