SC4612STDEVB Semtech, SC4612STDEVB Datasheet

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SC4612STDEVB

Manufacturer Part Number
SC4612STDEVB
Description
Manufacturer
Semtech
Datasheet
1.SC4612STDEVB.pdf (18 pages)

Specifications of SC4612STDEVB

Lead Free Status / Rohs Status
Supplier Unconfirmed
POWER MANAGEMENT
Features
Applications
Typical Application Circuit
March 24, 2009
Wide input voltage range, 4.75V to 40V
Internally regulated DRV
.7A gate drive capability
Low side RDS-ON sensing with hiccup OCP
Programmable current limit
Programmable frequency up to .2 MHz
Overtemperature protected
Pre-bias startup
Reference accuracy ±%
Available in MLPD-2 4 x 3 and SOIC-4 Pb-free pack-
ages. This product is fully WEEE and RoHS compliant
Distributed power architectures
Telecommunication equipment
Servers/work stations
Mixed signal applications
Base station power management
Point of use low voltage high current applications
© 2008 Semtech Corporation
Description
The SC462H is a high performance synchronous buck
controller that can be configured for a wide range of
applications. The SC462H utilizes synchronous rectified
buck topology where high efficiency is the primary con-
sideration. SC462H can be used over a wide input voltage
range with output voltage adjustable within limits set by
the duty cycle boundaries.
SC462H comes with a rich set of features such as regu-
lated DRV supply, programmable soft-start, high current
gate drivers, shoot through protection, R
hiccup over current protection.
40V Synchronous Buck Controller
SC4612H
DS(ON)
sensing with


SC4612STDEVB Summary of contents

Page 1

... SC462H comes with a rich set of features such as regu- lated DRV supply, programmable soft-start, high current gate drivers, shoot through protection, R hiccup over current protection. © 2008 Semtech Corporation SC4612H sensing with DS(ON)  ...

Page 2

Pin Configuration Marking Information Ordering Information Part Number Package (3) (2) SC462HMLTRT MLPD- SC462HSTRT SOIC-4 SC462HEVB EVALUATION BOARD () Notes: () When ordering please specify MLPD or SOIC package. (2) Only available in tape and reel packaging. A ...

Page 3

Absolute Maximum Ratings VDD ( ...

Page 4

Electrical Characteristics (continued) Parameter Symbol Current Limit - Low Side R DS(ON) Current Limit Threshold Voltage Error Amplifier Feedback Voltage Input Bias Current Open Loop Gain () Unity Gain Bandwidth () Output Sink Current Output Source Current Slew Rate () ...

Page 5

Typical Characteristics SC4612H 5 ...

Page 6

Typical Characteristics Startup from V OUT Short Circuit Applied =2.5V SC4612H Startup from V =0V OUT Startup from V =2.5V, first DH/DL Pulses OUT Steady State, no load 6 ...

Page 7

Pin Descriptions Pin # Pin # Pin Name MLPD SOIC , ILIM 2 3 OSC 3 4 SS/ EAO VDD 7 9 GND DRV 0 ...

Page 8

Block Diagram SC4612H 8 ...

Page 9

Applications Information General Description The SC46 versatile voltage mode synchronous rectified buck PWM convertor, with an input supply (VIN) ranging from 4.5V to 40V designed to control and drive N-channel MOSFETs. The power dissipation is controlled by allowing ...

Page 10

Applications Information (continued) Over Current Protection The SC462H features low side MOSFET RDS(ON) current sensing and hiccup mode over current protection. The voltage across the bottom FET is sampled approximately 50ns after it is turned on to prevent false tripping ...

Page 11

Applications Information (continued) 0dB at a rate of -20dB/dec. 4. Cancel w with compensation pole w ESR 5. Place a high frequency compensation pole w half the switching frequency to get the maximum attenuation of the switching ripple and the ...

Page 12

Applications Information (continued) POWER FETS - The FETs are chosen based on several criteria with probably the most important being power dissipation and power handling capability. TOP FET - The power dissipation in the top FET is a combination of ...

Page 13

Applications Information (continued) PCB Layout Guidelines Careful attention to layout is necessary for successful implementation of the SC462H PWM controller. High switching currents are present in the application and their effect on ground plane voltage differentials must be understood and ...

Page 14

Applications Information (continued) 4 ...

Page 15

Applications Information (continued) SC4612H 5 ...

Page 16

Applications Information (continued) Typical EVB Layout Top Copper Top Silk Screen SC4612H Bottom Copper (viewed from top) Top Assembly 6 ...

Page 17

Outline Drawing — MLPD-12 Land Pattern — MLPD-12 7 ...

Page 18

... Outline Drawing — SOIC-14 Land Pattern — SOIC-14 Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 9302 Phone: (805) 498-2 Fax: (805) 498-3804 www.semtech.com SC4612H 8 ...