SC1211VX

Manufacturer Part NumberSC1211VX
DescriptionHigh Speed - Combi-Sense - Synchronous MOSFET Driver for Mobile Applications
ManufacturerSemtech
SC1211VX datasheet
 
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POWER MANAGEMENT
Description
The SC1211VX is a high speed, Combi-Sense®, dual out-
put driver designed to drive high-side and low-side
MOSFETs in a synchronous Buck converter. These
drivers combined with Combi-Sense® PWM controllers,
such as Semtech SC2643VX or SC2643, provide a
cost effective multi-phase voltage regulator for advanced
microprocessors.
The Combi-Sense® is a technique to sense the inductor
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
- Only two small signal components (third optional)
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 SC1211VX is offered in a Power SOIC-8L package.
October 12, 2005
High Speed, Combi-Sense
MOSFET Driver for Mobile Applications
Features
u
High efficiency
u
High peak drive current
u
Adaptive non-overlapping gate drives provide
shoot-through protection
u
Support
and VID-on-fly operations
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
u
Power SOIC-8L package, fully RoHS and WEEE
compliant
Applications
u
Intel Pentium
processor power supplies
®
u
AMD Athlon
TM
and AMD-K8
supplies
u
High efficiency portable and notebook computer
u
Battery powered application
u
High current low voltage DC-DC converter
1
®
, Synchronous
www.DataSheet4U.com
processor power
TM
s
s
s
www.semtech.com

SC1211VX 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 SC1211VX is offered in a Power SOIC-8L package. October 12, 2005 High Speed, Combi-Sense MOSFET Driver for Mobile Applications ...

  • Page 2

    ... POWER MANAGEMENT Typical Application Circuit Vin (+12V) PWM Vcc (+5V) Inductor Curr ent Signal 2005 Semtech Corp 1uF 1N4148 R1 1R0 9 PGND U1 SC1211V 1uF R2 2 SC1211VX www.DataSheet4U.com Vout www.semtech.com ...

  • Page 3

    ... SC1211VX www.DataSheet4U.com < < ...

  • Page 4

    ... SC1211VX www.DataSheet4U.com ...

  • 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 SC1211VX www.DataSheet4U.com 1. PDL_TG F_TG t t PDH_BG R_BG Falling Edge Transition www.semtech.com ...

  • Page 6

    ... Semtech Corp. Ordering Information Note: 7 VCC (1) Only available in tape and reel packaging. A reel contains 2500 devices. 6 VIN (2). SC1211VXSTRT is lead free part. 5 VPN ...

  • Page 7

    ... POWER MANAGEMENT Block Diagram VCC CO PGND 2005 Semtech Corp. LOGIC UVLO CONTROL & OVERLAP PROT ECTION CIRCUIT 7 SC1211VX www.DataSheet4U.com VIN VPN BST TG DRN BG www.semtech.com ...

  • Page 8

    ... Pro ection ough Pr ection ection obtain the output inductor current information for the ough Pr ection ection peak current control. The Combi-Sense® technique fea- tured by the SC1211VX is an approach to sense induc- tor current without using sensing resistor. ), PDL_BG ). An adaptive circuit ) PDH_TG SC1211VX ). ...

  • Page 9

    ... Filters for Supply Power Filters for Supply Power Filters for Supply Power Filters for Supply Power Filters for Supply Power , exceeds 155°C. For VCC pin of the SC1211VX recommended to use j a 1uF to 4.7uF, 25V rating ceramic capacitor for decoupling ...

  • Page 10

    ... SOLDERING CONSIDERATION SOLDERING CONSIDERA TION TION The exposed die pad of the SC1211VX is used for ground return and thermal release of the driver. The pad must be soldered to the ground plane that is further connected to the system ground in the inner layer through multiple vias. For better electrical and thermal performance ...

  • Page 11

    ... POWER MANAGEMENT Outline Drawing - Power SOIC-8 Outline Drawing - Power SOIC-8L Land Pattern - Power SOIC-8 Contact Information 2005 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 11 SC1211VX www.DataSheet4U.com www.semtech.com ...