SIC403 datasheet(4/25 Pages) VISHAY

No. de pieza	SIC403

Descripción Electrónicos	microBUCK SiC403 6 A, 28 V Integrated Buck Regulator with Programmable LDO

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Fabricante Electrónico	VISHAY [Vishay Siliconix]

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Document Number: 66550

S11-1638-Rev. B, 15-Aug-11

Vishay Siliconix

SiC403

This document is subject to change without notice.

THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

Notes:

a. This device is ESD sensitive. Use of standard ESD handling precautions is required.

b. Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.

Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters

specififed in the Electrical Characteristics section is not recommended.

Thermal Resistance, Junction-to-Ambientb

High-Side MOSFET

Low-Side MOSFET

PWM Controller and LDO Thermal Resistance

25

20

50

°C/W

Peak IR Reflow Temperature

TReflow

-

260

°C

THERMAL RESISTANCE RATINGS

ELECTRICAL SPECIFICATIONS

Parameter

Symbol

Test Conditions Unless Specified

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

- 25 °C to + 85 °C for min. and max.,

TJ = < 125 °C

Min.

Typ.

Max.

Unit

Input Supplies

VIN UVLO Threshold Voltage

a

VIN_UV+

Sensed at ENL pin, rising edge

2.4

2.6

2.95

V

VIN_UV-

Sensed at ENL pin, falling edge

2.235

2.4

2.565

VIN UVLO Hysteresis

VIN_UV_HY

EN/PSV = High

0.2

VDD UVLO Threshold Voltage

VDD_UV+

Measured at VDD pin, rising edge

2.5

2.9

3

VDD_UV-

Measured at VDD pin, falling edge

2.4

2.7

2.9

VDD UVLO Hysteresis

VDD_UV_HY

0.2

VIN Supply Current

IIN

EN/PSV, ENL = 0 V, VIN = 28 V

8.5

20

µA

Standby mode:

ENL = VDD, EN/PSV = 0 V

130

VDD Supply Current

IVDD

EN/PSV, ENL = 0 V

3

7

EN/PSV = VDD, no load (fSW = 25 kHz),

VFB > 750 mV

b

2

mA

fSW = 250 kHz, EN/PSV = floating, no load

b

10

Controller

FB On-Time Threshold

VFB-TH

Static VIN and load, - 40 °C to + 85 °C

0.7425

0.750

0.7599

V

Frequency Rangeb

FPWM

continuous mode

200

1000

kHz

Bootstrap Switch Resistance

10



Timing

On-Time

tON

Continuous mode operation VIN = 15 V,

VOUT = 5 V, Rton = 300 k

2386

2650

2915

ns

Minimum On-Timeb

tON

80

Minimum Off-Timeb

tOFF

320

Soft Start

Soft Start Timeb

tSS

IOUT = ILIM/2

1.7

ms

Analog Inputs/Outputs

VOUT Input Resistance

RO-IN

500

k



Current Sense

Zero-Crossing Detector Threshold Voltage

VSense-th

LX-PGND

- 3.5

0.5

+ 4.7

mV

Power Good

Power Good Threshold Voltage

PG_VTH_UPPER

VFB > internal reference 750 mV

+ 20

%

Power Good Threshold Voltage

PG_VTH_LOWER

VFB < internal reference 750 mV

- 10

Start-Up Delay Time

PG_Td

Css = 10 nF

12

ms

Fault (noise-immunity) Delay Timeb

PG_ICC

VEN = 0 V

5

µs

Power Good Leakage Current

PG_ILK

VEN = 0 V

1

µA

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