SC1214

Manufacturer Part NumberSC1214
DescriptionHigh Speed - Combi-Sense Two-Phase - Synchronous MOSFET Driver
ManufacturerSemtech
SC1214 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
Page 1/8

Download datasheet (195Kb)Embed
Next
POWER MANAGEMENT
Description
The SC1214 is a high speed, Combi-Sense
driver designed to drive high-side and low-side MOSFETs
in two synchronous Buck converters. The driver com-
bined with Combi-Sense PWM controllers, such as
Semtech SC2643VX or SC2643, provides a cost effec-
tive two-phase voltage regulator for advanced micro-
processors
The Combi-Sense
is a technique to sense the inductor
TM
current for peak current mode control of voltage regula-
tor without using sensing resistor. It provides the follow-
ing advantages:
- No costly precision sensing resistor
- Lossless current sensing
- High level noise free signal
- Fast response
- Suitable for wide range of duty cycle
The detailed explanation of the technique can be found
in the Applications Information section.
A 30ns max propagation delay from input transition to
the gate of the power FET’s guarantees operation at high
switching frequencies. Internal overlap protection circuit
prevents shoot-through from Vin to PGND in the main
and synchronous MOSFETs. The adaptive overlap pro-
tection circuit ensures the bottom FET does not turn on
until the top FET source has reached 1V, to prevent cross-
conduction.
High current drive capability allows fast switching, thus
reducing switching losses at high (up to 1.5MHz) frequen-
cies without causing thermal stress on the driver.
Under-voltage-lockout and over-temperature shutdown
features are included for proper and safe operation.
Timed latches and improved robustness are built into
the housekeeping functions such as the Under Voltage
Lockout and adaptive Shoot-through protection circuitry
to prevent false triggering and to assure safe operation.
The SC1214 is offered in a TSSOP-20 package.
May 9, 2005
Two-Phase, Synchronous MOSFET Driver
Features
u
High efficiency
, two-phase
TM
u
+12V gate drive voltage
u
High peak drive current
u
Adaptive non-overlapping gate drives provide
shoot-through protection
u
Support
Combi-Sense
u
Fast rise and fall times (15ns typical with 3000pf
load)
u
Ultra-low (<30ns) propagation delay (BG going low)
u
Floating top gate drive
u
Crowbar function for over voltage protection
u
High frequency (to 1.5 MHz) operation allows use
of small inductors and low cost ceramic capacitors
u
Under-voltage-lockout
u
Low quiescent current
Applications
u
Intel Pentium
u
AMD Athlon
TM
supplies
u
High current low voltage DC-DC converter
1
High Speed, Combi-Sense
www.DataSheet4U.com
and VID-on-fly operations
TM
processor power supplies
®
processor power
and AMD-K8
TM
s
www.semtech.com
TM

SC1214 Summary of contents

  • Page 1

    ... Timed latches and improved robustness are built into the housekeeping functions such as the Under Voltage Lockout and adaptive Shoot-through protection circuitry to prevent false triggering and to assure safe operation. The SC1214 is offered in a TSSOP-20 package. May 9, 2005 Two-Phase, Synchronous MOSFET Driver Features ...

  • Page 2

    ... POWER MANAGEMENT Typical Application Circuit 2005 Semtech Corp. 2 SC1214 www.DataSheet4U.com www.semtech.com ...

  • Page 3

    ... SC1214 ° ° C ° C ° www.semtech.com ...

  • Page 4

    ... SC1214 ° C ° µ ...

  • Page 5

    ... POWER MANAGEMENT Timing Diagrams CO DRN PDL_BG Rising Edge Transition 2005 Semtech Corp PDH_TG R_TG 1.4V F_BG 5 SC1214 www.DataSheet4U.com 1. PDL_TG F_TG t t PDH_BG R_BG Falling Edge Transition www.semtech.com ...

  • Page 6

    ... SC1214 . ° ° ...

  • Page 7

    ... POWER MANAGEMENT Block Diagram VIN1,2 CO1,2 PGND 2005 Semtech Corp. UVLO LOGIC CONTROL & OVERLAP PROT ECTION CIRCUIT 7 SC1214 www.DataSheet4U.com LDO VREG1,2 VPN1,2 BST1,2 TG1,2 DRN1,2 BG1,2 www.semtech.com ...

  • Page 8

    ... BSC 6.40 BSC .026 BSC 0.65 BSC .024 .030 0.45 0.60 0.75 (.039) (1. 0° 8° 0° 8° .004 0.10 .004 0.10 .008 0. 0. (L1) A DETAIL DIMENSIONS INCHES MILLIMETERS (.222) (5.65) .161 4.10 .026 0.65 .016 0.40 .061 1.55 .283 7.20 SC1214 www.semtech.com ...