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IR3638SPBF

HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS

International Rectifier 

IR3638SPbF

Recommended Operating Conditions

Symbol

Vcc

Vc

Tj

Definition

Supply Voltage

Supply Voltage

Junction Temperature

Min

5

Converter Voltage + 5V

0

Max

13.2

20

125

Units

V

V

oC

Electrical Specifications

Unless otherwise specified, these specification apply over Vcc=Vc=12V, 0oC<Tj< 125oC

Parameter

SYM

Test Condition

Min TYP

Supply Current

VCC Supply Current

ICC(Static)

Enable=0V, No Switching

6.5

(Static)

VCC Supply Current

ICC(Dynamic)

Fs=400kHz, CLOAD=1.5nF

15

(Dynamic)

VC Supply Current (Static)

IC(Static)

Enable=0V, No Switching

3.3

MAX

10

25

10

Units

mA

mA

mA

VC Supply Current

(Dynamic)

IC(Dynamic)

Fs=400kHz, CLOAD=1.5nF

Under Voltage Lockout

Vcc-Start-Threshold

Vcc-Stop-Threshold

Vcc-Hysteresis

Enable-Start-Threshold

Enable-Stop-Threshold

Enable-Hysteresis

Fb_UVLO

Vcc UVLO(R)

Vcc UVLO(F)

Vcc(Hyst)

En UVLO (R)

En UVLO (F)

En(Hyst)

Fb_UVLO

Supply ramping up

Supply ramping down

Supply ramping up and down

Supply ramping up

Supply ramping down

Supply ramping up and down

Fb ramping down

Oscillator

Frequency

Ramp Amplitude

FS

Vramp

Note1

Min Duty Cycle

Max Duty Cycle

Dmin

Dmax

Fb=1V, Vp=0.8V

Fs=400kHz, Fb=0.6V,

Vp=0.8V

Error Amplifier

Fb Input Bias Current

Fb Input Bias current

Vp Input Bias Current

Transconductance

IFB1

SS=3V

IFB2

SS=0V

Ivp

SS=3V

gm

Input Offset Voltage

Vos

Vp=0.8V

Vp Common Mode Range

Vcomn

4.0

3.8

0.2

0.6

0.56

25

0.3

360

81

440

-6

0.6

13

4.25

4.0

0.25

0.65

0.6

42.5

0.4

400

1.25

85

-0.1

64

-0.1

0

20

4.5

4.2

0.35

0.7

0.66

60

0.5

440

0

95

-0.5

-0.5

1300

+6

1.5

mA

V

V

V

mV

V

kHz

V

%

%

μA

uA

uA

μmho

mV

V

Note1: Guaranteed by Design but not tested in production.

3/19/07

5

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