SC1401

© 2000 SEMTECH CORP.

652 MITCHELL ROAD

NEWBURY PARK CA 91320

HIGH PERFORMANCE SYNCHRONOUS BUCK

CONTROLLER WITH LDO FOR PORTABLE

POWER

November 21, 2000

3

ABSOLUTE MAXIMUM RATINGS

PARAMETER

MAXIMUM

UNITS

VDD1 to GND

-0.3 to +36

V

PGND to GND

- 0.3 to 0.3

V

V5V, FB, CSH, CSL, IOS to GND

-0.3 to +6

V

SYNC, SHDN, PSAVE, ENABLEIO to GND

-0.3 to +6

V

BST to GND

-0.3 to +36

V

BST to PHASE

-0.3 to 6

V

VDD2 to GND

-0.3 to +36

V

GATEIO to GND

9

V

-40 to +125

°C

Thermal resistance junction to ambient (

50

°C/W

Storage temperature

-65 to +150

°C

Lead soldering temperature

+300, 10 seconds

°C

ELECTRICAL CHARACTERISTICS

Unless specified: VDD1 = 12V, VDD2 = 12V V5V = 5V,

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SMPS CONTROLLER

VDD1 Input Voltage Range

6.0

30.0

V

VOUT SMPS

VREF

5.5

V

Internal BandGap Voltage, VREF

Measured at the Feedback pin

1.225

1.250

1.275

V

Load Regulation

0mV < CSH - CSL < 100mV

2

%

Line Regulation

6V < VDD1 < 30V

0.03

%/V

Overcurrent-Limit Threshold

CSH - CSL

100

130

160

mV

PSAVE Mode Threshold

CSH - CSL, PSAVE = 0 V

30

mV

Soft-Start Ramp Time

From enable to 95% full current limit with

512

clks

Oscillator Frequency

SYNC = V5V

SYNC = 0V

265

165

300

200

335

235

kHz

Maximum Duty Factor

85

90

87

93

%

SYNC = V5V

SYNC = 0V

Note 1: This device is ESD sensitive. Use of standard ESD handling precautions is required.