Si9174DM datasheet(2/17 Pages) VISHAY

2 / 17 page

Si9174

Vishay Siliconix

www.vishay.com

Document Number: 71668

S-41148—Rev. C, 14-jun-04

ABSOLUTE MAXIMUM RATINGS

Voltages Referenced to AGND = 0 V

VIN, VDD

6.2 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lx, SD, MODE, FB, DAC, SYNC

−0.3 to 6.2 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(or to VDD )0.3 V whichever is less)

GND

−0.3 to +0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ESD Rating

2 kV

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage Temperature

−65 to 125_C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Junction Temperature

150_C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Dissipation (Package)a

10-pin MSOPb

481 mW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-pin MLP33

915 mW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Thermal Impedance (QJA)

10-Pin MSOP

135_C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-Pin MLP33

71_C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Peak Inductor Current

1.8 A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Notes

Device mounted with all leads soldered or welded to PC board.

Derate 7.4 mW/_C above 85_C.

Derate 14 mW/_C above 85_C.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation

of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

RECOMMENDED OPERATING RANGE

VIN Range

2.6 V to 5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CIN

10 mF Ceramic

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COUT

4.7 mF Ceramic

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inductor

2.2 mH

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Load Current PWM Mode

0 to 600 mA

. . . . . . . . . . . . . . . . . . . . . .

Operating Load Current PSM Mode

0 to 150 mA

. . . . . . . . . . . . . . . . . . . . . . .

SPECIFICATIONS

Parameter

Test Conditions Unless Specified

40_C to 85_C VIN = VDD VDAC = 1 215 V CIN = 10 mF

Limits

Modef

Symbol

−40_C to 85_C, VIN = VDD, VDAC = 1.215 V, CIN = 10 mF,

COUT = 4.7 mF, L = 2.2 mH, 2.6 V v VIN v 5.5 V

R1 = 11.3 kW, R2 = 20 kW

Mina

Typb

Maxa

Unit

Under Voltage Lockout (UVLO)

Under Voltage Lockout (turn-on)

VIN rising

2.3

2.5

Hysteresis

0.1

Shutdown (SD)

Logic HIGH

VSDH

1.6

Logic LOW

VSDL

0.4

Delay to Outputc

Settle Within $2% accuracy SD rising

RL = 3.3 W

100

Delay to Outputc

ten

Settle Within $2% accuracy SD rising

tr < 1 ms

RL = 51 W

100

Pull Down

ISD

Input at VIN

Mode Selection Tri-Level Logic (MODE)

MODE Pin HIGH

PWM

VIN −0.4

VIN

MODE Pin LOW

Auto

0.4

Mode Pin Input Current

MODE = GND

−5

Mode Pin Input Current

MODE = VIN

Oscillator

Frequency

fOSC

1.6

2.4

MHz

External Clock Synchronization (SYNC)

Frequency

SYNC Input = 500 mVp-p

MHz

Ac Coupled Sinewave

Frequency = 13 MHz

0.2

0.8

Vp-p

Error Amplifier (FB, DAC Pin)

FB Voltage Accuracy

VDAC

−20

VDAC

+20

DAC Input Voltage Range

VIN > 2.6, VIN − VDAC > 0.5 V

0.28

2.45

Input Bias Current FB, DAC

IFBDAC

VFB = 1.25 V

−1

0.01

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