CRCW25121R00FKEG datasheet(9/24 Pages) VISHAY

Part #	CRCW25121R00FKEG

Description	6 A, microBUCK SiC414, SiC424 Integrated Buck Regulator with 5 V LDO

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Manufacturer	VISHAY [Vishay Siliconix]

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Vishay Siliconix

SiC414, SiC424

Document Number: 63388

S13-0248-Rev. B, 04-Feb-13

www.vishay.com

9

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

For technical questions, contact: powerictechsupport@vishay.com

ELECTRICAL CHARACTERISTICS

APPLICATIONS INFORMATION

Device Overview

The SiC414 and SiC424 are a step down synchronous buck

DC/DC

converter

with

integrated

power

FETs

and

programmable LDO. The device is capable of 6 A operation

at very high efficiency in a tiny 4 mm x 4 mm - 28 pin

package. The programmable operating frequency range of

200 kHz to 1 MHz, enables the user to optimize the solution

for minimum board space and optimum efficiency.

The

buck

controller

employs

pseudo-fixed

frequency

adaptive on-time control. This control scheme allows fast

transient response thereby lowering the size of the power

components used in the system.

The

buck

controller

employs

pseudo-fixed

frequency

adaptive on-time control. This control scheme allows fast

transient response thereby lowering the size of the power

components used in the system.

Input Voltage Range

The SiC414 and SiC424 requires two input supplies for

normal operation: VIN and V5V. VIN operates over the wide

range from 3 V to 28 V. V5V requires a 3.3 V or 5 V supply

input that can be an external source or the internal LDO

configured to supply 5 V.

Pseudo-Fixed Frequency Adaptive On-Time Control

The PWM control method used by the SiC414 and SiC424

is

pseudo-fixed frequency, adaptive on-time, as shown in

figure 1. The ripple voltage generated at the output capacitor

ESR is used as a PWM ramp signal. This ripple is used to

trigger the on-time of the controller.

The adaptive on-time is determined by an internal one-shot

timer. When the one-shot is triggered by the output ripple, the

device sends a single on-time pulse to the high side

MOSFET. The pulse period is determined by VOUT and VIN;

the period is proportional to output voltage and inversely

proportional to input voltage. With this adaptive on-time

arrangement, the device automatically anticipates the

on-time needed to regulate VOUT for the present VIN

condition and at the selected frequency.

The adaptive on-time control has significant advantages over

traditional control methods used in the controllers today.

• Reduced component count by eliminating DCR sense or

current sense resistor as no need of a sensing inductor

current.

• Reduced

saves

external

components

used

for

compensation by eliminating the no error amplifier and

other components.

• Ultra fast transient response because of fast loop,

absence of error amplifier speeds up the transient

response.

• Predictable frequency spread because of constant on-time

architecture.

• Fast transient response enables operation with minimum

output

capacitance

Overall,

superior

performance

compared to fixed frequency architectures.

Overall, superior performance compared to fixed frequency

architectures.

Start-up with VIN Ramping up

(VIN = 12 V, VOUT = 1 V, FSW = 500 kHz)

Over-Current Protection

(VIN = 12 V, VOUT = 1 V, FSW = 500 kHz)

Figure 1 - PWM Control Method, VOUT Ripple

VIN

CIN

VLX

Q1

Q2

L

ESR

+

FB

VLX

tON

VFB

COUT

VOUT

FB threshold

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