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SC1401

HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PORTABLE POWER

Semtech Corporation 

HIGH PERFORMANCE SYNCHRONOUS BUCK

CONTROLLER WITH LDO FOR PORTABLE

SC1401

POWER

November 21, 2000

ABSOLUTE MAXIMUM RATINGS

PARAMETER

VDD1 to GND

PGND to GND

V5V, FB, CSH, CSL, IOS to GND

SYNC, SHDN, PSAVE, ENABLEIO to GND

BST to GND

BST to PHASE

VDD2 to GND

GATEIO to GND

Junction operating temperature (TJ)

Thermal resistance junction to ambient (θJA)

Storage temperature

Lead soldering temperature

MAXIMUM

-0.3 to +36

- 0.3 to 0.3

-0.3 to +6

-0.3 to +6

-0.3 to +36

-0.3 to 6

-0.3 to +36

9

-40 to +125

50

-65 to +150

+300, 10 seconds

UNITS

V

V

V

V

V

V

V

V

°C

°C/W

°C

°C

ELECTRICAL CHARACTERISTICS

Unless specified: VDD1 = 12V, VDD2 = 12V V5V = 5V, SHDN = PSAVE = 5V, TA = -40 °C to +85 °C . Typical values are at TA = +25°C.

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

Overcurrent-Limit Threshold

PSAVE Mode Threshold

Soft-Start Ramp Time

Oscillator Frequency

6V < VDD1 < 30V

0.03

%/V

CSH - CSL

100 130

160

mV

CSH - CSL, PSAVE = 0 V

30

mV

From enable to 95% full current limit with

512

clks

respect to fOSC

SYNC = V5V

SYNC = 0V

265 300

165 200

335 kHz

235

Maximum Duty Factor

SYNC = V5V

SYNC = 0V

85

87

%

90

93

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

© 2000 SEMTECH CORP.

3

652 MITCHELL ROAD NEWBURY PARK CA 91320

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