SC1404(2003) View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SC1404
(Rev.:2003)

Mobile Multi-Output PWM Controller with Virtual Current Sense™

Semtech Corporation 

SC1404

POWER MANAGEMENT

Electrical Characteristics Cont.

Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = 0V, VL load = 0mA, REF load = 0mA, PSAVE# = 0V, TA =-40 to 85°C.

Typical values are at TA = +25°C. Circuit = Typical Application Circuit

PARAMETER

CODE

CONDITIONS

MIN TYP

MAX

UNITS

Current-Limit Thresholds

(Note 2)

I3LIMP

I5LIMP

I3LIMN

I5LIMN

CSHX - CSLX (positive current)

CSHX - CSLX (negative current)

40 55

70

mV

-50

Zero Crossing Threshold ZC3

ZC5

CSHX - CSLX PSAVE# = 0V, not tested

5

mV

Soft-Start Ramp Time

Oscillator Frequency

FOSCHI

FOSCLO

From enable to 95% full current limit,

with respect to fOSC

SYNC = VL

SYNC = 0V

512

clks

220 300 380 kHz

170 200 230

Maximum Duty Factor

DF3MAX

DF5MAX

SYNC = VL

SYNC = 0V

92 94

%

94 96

SYNC Input High Pulse

Not tested

300

ns

SYNC Input Low Pulse

Width

Not tested

300

SYNC Rise/Fall Time

Not tested

200

SYNC Input Frequency

Range

SYNCRG

240 -

kHz

350

Current-Sense Input

Leakage Current

ICSH3

ICSH5

CSH3 = 3.3V, CSH5 = 5.0V

3

10

µA

ERROR AMP

DC Loop Gain

DCG3, DCG5 From internal feedback node to COMP3/COMP5

18

V/V

Gain Bandwidth Product

8

MHz

Output Resistance

RC3, RC5

COMP3, COMP5

25

Kohms

INTERNAL REGULATOR AND REFERENCE

VL Output Voltage

VLOUT

VL Undervoltage Lockout VLUV

Fault Threshold

SHDN# = V+; 6V < V+ <30V,

0mA <I < LOAD 30mA, ON3 = ON5 = 0V

Falling edge, hysteresis = 0.7V

4.6

5.25

V

3.5 3.7 4.1

VL Switchover Lockout VLSW

Switchover at startup - rising edge

4.5

REF Output Voltage

REFOUT

No external load

2.45 2.5 2.55

REF Load Regulation

REFLD1

REFLD2

0µA < I < 50µA

LOAD

0mA < ILOAD < 5mA

12.5 mV

50

 2003 Semtech Corp.

3

www.semtech.com

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