SC1218

Manufacturer Part NumberSC1218
DescriptionHigh Speed Synchronous MOSFET Driver
ManufacturerSemtech
SC1218 datasheet
 
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
Page 1/12

Download datasheet (421Kb)Embed
Next
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
www.DataSheet4U.com
Processor Power
and AMD-K8
TM
TM
Mtop
Cin
Lout
Rdrn
Mbot
www.semtech.com
s
VOUT
Cout

SC1218 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 generation micropro- cessors. ...

  • Page 2

    ... SC1218 ...

  • Page 3

    ... > SC1218 www.DataSheet4U.com ...

  • Page 4

    ... VIN & EN VIN>UVLO VIN>UVLO & & Rising Edge Transition Rising Edge Transition EN=“HI” EN=“HI” 2005 Semtech Corp CO_LO CO_LO PDL_TG PDL_TG PDH_TG PDH_TG 1.4V 1. PDH_BG PDH_BG Falling Edge Transition Falling Edge Transition 4 SC1218 www.DataSheet4U.com 1.0V 1.0V www.semtech.com ...

  • Page 5

    ... SC1218 ...

  • Page 6

    ... UVLO UVLO UVLO UVLO CONTROL CONTROL CONTROL CONTROL & & & & OVERLAP OVERLAP OVERLAP OVERLAP CIRCUIT CIRCUIT CIRCUIT CIRCUIT 6 SC1218 www.DataSheet4U.com Fig Fall and BG Rise Times www.semtech.com BST BST BST BST DRN DRN DRN ...

  • Page 7

    ... LOAD CAPACITANCE (nF) V =12V IN C =3.3nF Load_TG C =3.3nF Load_BG T =25° 200 400 600 800 1000 1200 FREQUENCY (KHz) Fig. 7. Supply Current vs. Frequency. V =12V IN C =3.3nF Load_TG C =3.3nF Load_BG Freq.=200KHz TEMPERATURE (°C) SC1218 1400 1600 100 125 www.semtech.com ...

  • Page 8

    ... 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 Voltage. 2005 Semtech Corp. 9.0 8.0 BG 7.0 6.0 TG 5.0 4.0 3.0 2.0 1.0 0 Fig. 10. Peak Sinking Current vs. Supply Voltage. 8 www.DataSheet4U.com C =10nF LOAD_TG C =10nF LOAD_BG T =25° (V) IN SC1218 www.semtech.com ...

  • Page 9

    ... Bootstrap and Chip Decoupling Capacitors Bootstrap and Chip Decoupling Capacitors Bootstrap and Chip Decoupling Capacitors The top gate driver of the SC1218 is a DRN refered gate drive whose supply voltage is derived from a bootstrap circuit comprising a capacitor,C The capacitor value can be calculated based on the total ...

  • Page 10

    ... PCB layout. In the applica- tions with TO-220 package FETs suggested to use a clamping diode on the DRN pin to mitigate the impact of the excessive phase node negative spikes. For VIN pin of the SC1218 recommended to use a 1uF/16V ceramic capacitor for decoupling. Driv Driv ...

  • Page 11

    ... NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. 11 SC1218 www.DataSheet4U.com DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX - - .053 .069 1.35 1 ...

  • Page 12

    ... BSC 3.00 BSC .059 - .071 1.50 E2 .059 - .071 1.50 - .118 BSC E 3.00 BSC e .026 BSC 0.65 BSC L .012 .016 .020 0.30 0. .008 0. 0° 12° 0° aaa .003 0.08 bbb .008 0.20 DIMENSIONS MILLIMETERS (.122) (3.10) .089 2.25 .073 1.85 .073 1.85 .026 0.65 .014 0.35 .033 0.85 .156 3.95 SC1218 MAX 1.00 0.05 0.30 1.80 1.80 0.50 - 12° www.semtech.com ...