sc1218strt

Manufacturer Part Numbersc1218strt
DescriptionSc1218 High-speed Synchronous Power Mosfet Driver
ManufacturerSemtech Corporation
sc1218strt datasheet
 
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POWER MANAGEMENT
Description
The SC1218 is a high speed, robust, dual output driver to
drive high-side and low-side N-MOSFETs in synchronous
buck converters. Combined with Semtech’s multi-phase
PWM controller SC2649, one can build high performance,
versatile voltage regulators for next generation micropro-
cessors.
SC1218 is built upon a CMOS technology which provides
enough voltage capacity to handle computer applications.
In addition, the advanced timing circuitry is adopted to
filter out very narrow PWM pulses at the input of the driver.
The latched UVLO and enhanced adaptive shoot-through
protection further enhance the robustness of the SC1218.
With integrated bootstrap diode, the SC1218 is offered in
both SOIC-8 package and MLPQ-8 3x3mm package. These
features further reduce the thermal stress and BOM cost.
Typical Application Circuit
VIN
PWM
EN
Rv in
2R2
Revision: October 14, 2005
Synchronous MOSFET Driver
Features
Advanced Digital Timing to Filter Out Very Narrow PWM
Pulses
+12V Gate Drive Voltage
Integrated Bootstrap Diode
High Peak Drive Current
Adaptive Non-overlapping Gate Drives Provide Shoot-
through Protection
Support Dynamic VID operation
Ultra-low Propagation Delay
Floating Top Gate Drive
Crowbar Function for Over Voltage Protection
High Frequency (up to 2 MHz) Operation Allows Use of
Small Inductors and Low Cost Ceramic Capacitors
Under Voltage Lockout
Low Quiescent Current
Enable Function for Both Gate OFF Shut Down
Lead-free Part and Fully WEEE and RoHS Compliant
Applications
Intel Next Generation Processor Power Supplies
AMD Athlon
Supplies
High Current Low Voltage DC-DC Converter
Cbst
1uF
BST
TG
CO
DRN
(optional)
EN
PGND
VIN
BG
SC1218
Cv in
1uF
1
SC1218
High Speed
Processor Power
and AMD-K8
TM
TM
Mtop
Cin
Lout
Rdrn
Mbot
www.semtech.com
s
VOUT
Cout

sc1218strt Summary of contents

  • Page 1

    POWER MANAGEMENT Description The SC1218 is a high speed, robust, dual output driver to drive high-side and low-side N-MOSFETs in synchronous buck converters. Combined with Semtech’s multi-phase PWM controller SC2649, one can build high performance, versatile voltage regulators for next ...

  • Page 2

    POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...

  • Page 3

    POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 25° 12V ...

  • Page 4

    POWER MANAGEMENT Timing Diagrams V V CO_HI CO_HI PDL_BG PDL_BG DRN DRN VIN & EN VIN & EN VIN>UVLO VIN>UVLO & & Rising Edge Transition Rising Edge Transition EN=“HI” EN=“HI” 2005 Semtech ...

  • Page 5

    POWER MANAGEMENT Pin Configuration SOIC-8 Top View BST VIN 4 5 Pin Descriptions ...

  • Page 6

    POWER MANAGEMENT Block Diagram VIN VIN VIN VIN PROTECTION PROTECTION PROTECTION PROTECTION PGND PGND PGND PGND Typical Performance Characteristics Fig Rise and BG ...

  • Page 7

    POWER MANAGEMENT Typical Performance Characteristics (Cont =12V IN C =3.3nF Load TEMPERATURE (°C) Fig and BG Rise Times vs. Temperature =12V IN C =3.3nF Load 10 ...

  • Page 8

    POWER MANAGEMENT Typical Performance Characteristics (Cont.) 4.5 C =10nF LOAD_TG 4.0 C =10nF LOAD_BG T =25°C 3.5 A 3.0 2.5 2.0 1.5 1.0 0.5 0 (V) IN Fig. 9. Peak Sourcing Current vs. Supply ...

  • Page 9

    POWER MANAGEMENT Applications Information THEORY OF OPERA THEOR THEOR THEOR THEOR Y OF OPERATION Y OF OPERA Y OF OPERA Y OF OPERA TION TION TION TION The SC1218 is a high speed, robust, dual output driver designed to drive ...

  • Page 10

    POWER MANAGEMENT Applications Information (Cont.) Typically, a 1uF/16V ceramic capacitor is used. In addi- tion, a small resistor (one ohm) is recommended in be- tween DRN pin of the SC1218 and the phase node. The resistor is used to alleviate ...

  • Page 11

    POWER MANAGEMENT Outline Drawing - SOIC-8 2X E/2 ccc C 2X N/2 TIPS aaa C SEATING PLANE C SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND 3. DIMENSIONS "E1" AND "D" DO ...

  • Page 12

    ... CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. THE VIAS ON THE CENTER PAD SHOULD MAINTAIN THE GOOD THERMAL CONTACT OF THE DEVICE TO THE PCB GROUND PLANE. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 12 ...