SC1211STR

Manufacturer Part NumberSC1211STR
ManufacturerSemtech
SC1211STR datasheet
 

Specifications of SC1211STR

Number Of Drivers2Driver ConfigurationInverting/Non-Inverting
Driver TypeHigh and Low SideRise Time15ns
Fall Time10nsPropagation Delay Time37ns
Frequency (max)1.5MHzOperating Supply Voltage (max)15V
Peak Output Current3.5APower Dissipation2.56W
Output Resistance1.5OhmOperating Supply Voltage (min)9V
Operating Supply Voltage (typ)12VOperating Temp Range0C to 125C
Operating Temperature ClassificationCommercialMountingSurface Mount
Pin Count8Package TypeSOIC EP
Lead Free Status / Rohs StatusNot Compliant  
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POWER MANAGEMENT
Description
The SC1211 is a high speed, Combi-Sense
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
TM
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.
8.5V gate drive provides optimum enhancement of
MOSFETs at minimum driver and MOSFET switching loss.
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 SC1211 is offered in a Power SOIC-8L package.
October 12, 2003
Synchronous MOSFET Driver
Features
u
, dual out-
High efficiency
TM
u
+12V supply voltage with internal LDO for optimum
gate drive
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
and VID-on-fly operations
TM
processor power supplies
processor power
and AMD-K8
TM
s
www.semtech.com
TM

SC1211STR Summary of contents

  • Page 1

    ... Description The SC1211 is a high speed, Combi-Sense 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 TM ...

  • Page 2

    ... POWER MANAGEMENT Typical Application Circuit + DRN VREG 3 6 BST VIN VPN 2 1 2003 Semtech Corp DRN VREG 3 6 BST VIN VPN 2 SC1211 + + + + DRN VREG 3 6 BST VIN VPN www.semtech.com ...

  • Page 3

    ... 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 NOTE: (1). This device is ESD sensitive. Use of standard ESD handling precautions is required. (2). Pulse width measured from 50% to 50% of peak voltage V Electrical Characteristics Unless specified 25° 12V REG 2003 Semtech Corp 8. < < < < < < ...

  • Page 4

    ... POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 25° 12V REG NOTE: (1) Guaranteed by design. 2003 Semtech Corp SC1211 ° C ° µ s µ s www.semtech.com ...

  • Page 5

    ... POWER MANAGEMENT Timing Diagrams CO DRN PDL_BG Rising Edge Transition 2003 Semtech Corp PDH_TG R_TG 1.4V F_BG 5 SC1211 1. PDL_TG F_TG t t PDH_BG R_BG Falling Edge Transition www.semtech.com ...

  • Page 6

    ... POWER MANAGEMENT Pin Configuration Top View DRN BST EXPOSED PAD MUST BE SOLDERED TO POWER GROUND PLANE (Power SOIC-8) Pin Descriptions 2003 Semtech Corp. Ordering Information Note: (1) Only available in tape and reel packaging. A reel VREG contains 2500 devices. VIN VPN µ µ ° 0 ...

  • Page 7

    ... POWER MANAGEMENT Block Diagram VIN CO PGND 2003 Semtech Corp. UVLO LOGIC CONTROL & OVERLAP PROT ECTION CIRCUIT 7 SC1211 LDO VREG VPN BST TG DRN BG www.semtech.com ...

  • Page 8

    ... It holds the bottom FET off until the phase node voltage has dropped below 1.0V. This prevents the top and bottom FETs from conducting 2003 Semtech Corp. simultaneously or shoot-through. Minimum Off-Time for Bottom Gate Minimum Off-Time for Bottom Gate ...

  • Page 9

    ... An optional capacitor between VPN and DRN allows these two nodes coupled during the tri-state window, hence yields a perfect timing match. 2003 Semtech Corp. Refer to Semtech SC2643VX Combi-Sense Mode Controller about the details of the Combi-Sense VIN technique. Optimized Gat ...

  • Page 10

    ... For a multi-phase voltage regulator, the SC1211 driver, FETs, inductor, and supply decoupling capacitors in each phase have to be considered as a whole during PCB layout. Refer to Semtech SC2643VX/ SC1211 EVB Layout Guideline. For the SC1211 driver, the following guidelines are typi- cally recommended during PCB layout: 1 ...

  • Page 11

    ... POWER MANAGEMENT Outline Drawing - Power SOIC-8 Outline Drawing - Power SOIC-8L Land Pattern - Power SOIC-8 Contact Information 2003 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 11 SC1211 www.semtech.com ...