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AUGUST 08, 2012 | DATA SHEET | Rev 3.3

6

IR3898

Single-Input Voltage, Synchronous Buck Regulator

PD-97662

ELECTRICAL SPECIFICATIONS

RECOMMENDED OPERATING CONDITIONS FOR RELIABLE OPERATION WITH MARGIN

SYMBOL

MIN

MAX

UNITS

Input Voltage Range*

PVin

1.0

21

V

Input Voltage Range**

Vin

6.8

21

Supply Voltage Range***

4.5

7.5

Supply Voltage Range

Boot to SW

4.5

7.5

Output Voltage Range

0.5

0.86xVin

Output Current Range

0

±6

A

Switching Frequency

300

1500

kHz

Operating Junction Temperature

-40

125

°C

*Maximum SW node voltage should not exceed 25V.

**For internally biased single rail operation.

***Vcc/LDO_Out can be connected to an external regulated supply. If so, the Vin pin should be connected to Vcc/LDO_Out pin.

ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNIT

Power Stage

Power Losses

Fs = 600kHz, L = 1uH,

Vcc = 6.4V, Note 4

0.85

W

Top Switch

17.5

22.5

mΩ

Bottom Switch

11.4

14.8

Bootstrap Diode Forward Voltage

I(Boot) = 10mA

180

260

470

mV

SW Leakage Current

SW = 0V, Enable = 0V

1

µA

SW = 0V, Enable = high,

Vp = 0V

Dead Band Time

Note 4

5

10

30

ns

Supply Current

VIN Supply Current (standby)

EN = Low, No Switching

100

µA

VIN Supply Current (dynamic)

EN = High, Fs = 600kHz,

Vin = PVin = 21V

11

15

mA

Vcc/ LDO_Out

Output Voltage

Vin(min) = 6.8V, Icc = 0-30mA,

Cload = 2.2uF, DCM = 0

6.0

6.4

6.7

V

Vin(min) = 6.8V, Icc = 0-30mA,

Cload = 2.2uF, DCM = 1

4.0

4.4

4.8

LDO dropout Voltage

Icc=30mA,Cload=2.2uF

0.7

V

Short Circuit Current

Ishort

70

mA