3

Date: /5/06

SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator

© Copyright 2006 Sipex Corporation

3

Date: 2/16/06

SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator

© Copyright 2006 Sipex Corporation

ELECTRICAL SPECIFICATIONS

The denotes the specifications which apply over the full temperature range, unless otherwise specified.

PARAMETER

MIN. TYP. MAX.

UNITS

CONDITIONS

CONTROL LOOP: PWM COMPARATOR, RAMP & LOOP DELAY PATH

Ramp Amplitude

0.92

1.1

1.28

V

RAMP Offset

1.1

V

T

until GH starts Switching

RAMP offset Temp. Coefficient

-2

mV/˚C

GH Minimum Pulse Width

90

180

ns

Maximum Controllable Duty Ratio

92

97

%

Maximum Duty Ratio Measured

just before pulsing begins

Maximum Duty Ratio

100

%

Valid for 20 cycles

Internal Oscillator Ratio

240

300

360

kHz

TIMERS: SOFTSTART

SS Charge Current:

10

µA

SS Discharge Current:

1

mA

Fault Present, SS = 0.2V

PROTECTION: SHORT CIRCUIT & THERMAL

Short Circuit Threshold Voltage

0.2

0.25

0.3

V

Hiccup Timeout

200

ms

Number of Allowable Clock Cycles

at 100% Duty Cycle

20

Cycles

Minimum GL Pulse After 20 Cycles

0.5

Cycles

Thermal Shutdown Temperature

145

˚C

V

Thermal Recovery Temperature

135

˚C

Thermal Hysteresis

10

˚C

OUTPUT: POWER STAGE

High Side Switch R

DSON

40

mΩ

Synchrous Lowside Switch R

DSON

40

mΩ

Maximum Output Current

3

A