3

Rev J: 3/4/07

SP765 Wide Input Voltage Range 3A, 900kHz, Buck Regulator

© Copyright 2007 Sipex Corporation

ELECTRICAL CHARACTERISTICS

The

PARAMETER

MIN. TYP.

MAX. UNITS

CONDITIONS

CONTROL LOOP: PWM COMPARATOR, RAMP & LOOP DELAY PATH

Ramp Amplitude

0.92

.

.28

V

RAMP Offset

.

V

TA = 25°C, RAMP COMP

until GH starts Switching

RAMP Offset Temp. Coefficient

-2

mV/°C

GH Minimum Pulse Width

90

80

ns

•

Maximum Controllable Duty Ratio

92

97

%

Maximum Duty Ratio Measured

just before pulsing begins

Maximum Duty Ratio

00

%

Valid for 20 cycles

Internal Oscillator Ratio

80

900

990

kHz

•

TIMERS: SOFTSTART

SS Charge Current:

0

µA

SS Discharge Current:



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

45

°C

Thermal Recovery Temperature

35

°C

Thermal Hysteresis

0

°C

OUTPUT: POWER STAGE

40

mΩ

40

mΩ

Maximum Output Current

3

A