SIC417 datasheet(5/21 Pages) VISHAY

Part #	SIC417

Description	10-A, 28-V Integrated Buck Regulator with Programmable LDO

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Manufacturer	VISHAY [Vishay Siliconix]

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Document Number: 69062

S10-1367-Rev. D, 14-Jun-10

www.vishay.com

5

Vishay Siliconix

SiC417

Notes:

a. VIN UVLO is programmable using a resistor divider from VIN to ENL to AGND. The ENL voltage is compared to an internal reference.

b. Guaranteed by design.

c. The switch-over threshold is the maximum voltage diff erential between the VLDO and VOUT pins which ensures that VLDO will internally

switch-over to VOUT. The non-switch-over threshold is the minimum voltage diff erential between the VLDO and VOUT pins which ensures that

VLDO will not switch-over to VOUT.

d. The LDO drop out voltage is the voltage at which the LDO output drops 2 % below the nominal regulation point.

ELECTRICAL CHARACTERISTICS

Fault Protection

ILIM Source Current

ILIM

10

µA

Valley Current Limit

RILIM = 5.9 kΩ

68

10

A

ILIM Comparator Offset Voltage

VILM-LK

With respect to AGND

- 10

0

+ 10

mV

Output Under-Voltage Fault

VOUV_Fault

VFB with respect to Internal 500 mV reference,

8 consecutive clocks

- 25

%

Smart Power-Save Protection

Threshold Voltageb

PSAVE_VTH

VFB with respect to internal 500 mV reference

+ 10

%

Over-Voltage Protection Threshold

VFB with respect to internal 500 mV reference

+ 20

Over-Voltage Fault Delayb

tOV-Delay

5µs

Over Temperature Shutdownb

TShut

10 °C hysteresis

150

°C

Logic Inputs/Outputs

Logic Input High Voltage

VIN+

EN, ENL, PSV

2

V

Logic Input Low Voltage

VIN-

0.4

EN/PSV Input Bias Current

IEN-

EN/PSV = V5V or AGND

- 10

+ 10

µA

ENL Input Bias Current

VIN = 28 V

11

18

FBL, FB Input Bias Current

FBL_ILK

FBL, FB = V5V or AGND

- 1

+ 1

Linear Dropout Regulator

FBL Accuracy

FBLACC

VLDO load = 10 mA

0.735

0.75

0.765

V

LDO Current Limit

LDO_ILIM

Start-up and foldback, VIN = 12 V

85

mA

Operating current limit, VIN = 12 V

135

200

VLDO to VOUT Switch-Over Threshold

c

VLDO-BPS

- 140

+ 140

mV

VLDO to VOUT Non-Switch-Over Threshold

c

VLDO-NBPS

- 450

+ 450

VLDO to VOUT Switch-Over Resistance

RLDO

VOUT = 5 V

2

Ω

LDO Drop Out Voltaged

From VIN to VVLDO, VVLDO = + 5 V,

IVLDO = 100 mA

1.2

V

ELECTRICAL SPECIFICATIONS

Parameter

Symbol

Test Conditions Unless Specified

VIN = 12 V, V5V = 5 V, TA = + 25 °C for typ.,

- 25 °C to + 85 °C for min. and max.,

TJ = < 125 °C

Min.

Typ.

Max.

Unit

Efficiency vs. Output Current (VOUT = 1.2 V)

IOUT (A)

50

55

60

65

70

75

80

85

90

95

100

0

1234

56

7

8

910

VIN =9 V

VIN = 19 V

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