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SC1404

Mobile Multi-Output PWM Controller with Virtual Current Sense™

Semtech Corporation 

SC1404

POWER MANAGEMENT

PRELIMINARY

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

CONDITIONS

MIN TYP MAX UNITS

REF Sink Current

10mV rise in REF voltage

10

µA

REF Fault Lockout Voltage

Falling edge

1.8

2.2

V

V+ Operating Supply

Current

V+ Standby Supply Current

VL switched over to VOUT5, 5V SMPS on,

ILOAD5 = ILOAD3 = 0A, PSAVE# = 0V

V+ = 6V to 30V, both SMPS off, PSAVE# = 0V;

includes current into SHDN#

10 50

µA

300

V+ Shutdown Supply

Current

V+ = 6V to 30V, SHDN# = 0V

-1

3

15

Quiescent Power

Consumption

SMPS enabled, No Load on SMPS

6

mW

FAULT DETECTION

Overvoltage Trip Threshold

With respect to unloaded output voltage

7 10 15

%

Overvoltage Fault

Propagation Delay

Output driven 2% above overvoltage trip V TH

1.5

µs

Output Undervoltage

Threshold

With respect to unloaded output voltage

65 75 85

%

Output Undervoltage

Lockout Time

From each SMPS enabled, with respect to f OSC

5000 6144 7000 clks

Thermal Shutdown

Threshold

Typical hysteresis = 10°C

+150

°C

RESET#

RESET# Trip Threshold

With respect to unloaded output voltage, falling edge; -12 -9 -5

%

typical hysteresis = 1%

RESET# Propagation Delay

Falling edge, output driven 2% below RESET# trip

threshold

1.5

µs

RESET# Delay Time

With respect to fOSC

INPUTS AND OUTPUTS

27,000 32,000 37,000 clks

Logic Input Low Voltage

ON3, PSAVE#, ON5, SHDN#, SYNC

(SEQ = REF)

0.6

V

Logic Input High Voltage

 2004 Semtech Corp.

ON3, PSAVE#, ON5, SHDN#, SYNC

(SEQ = REF)

4

2.4

V

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