PWM Controller. SC2646B Datasheet

SC2646B Controller. Datasheet pdf. Equivalent

Part SC2646B
Description Combi-Sense PWM Controller
Feature www.DataSheet4U.com Combi-Sense Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ TM 2, 3 or 4 Phase PWM Con.
Manufacture Semtech Corporation
Datasheet
Download SC2646B Datasheet



SC2646B
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POWER MANAGEMENT
Description
The SC2646B controller provides a microprocessor core
voltage regulation solution for up to 4 paralleled PWM
channels. The solution can be configured in 2, 3, or 4-
phase form. This multi-phase buck regulator utilizes
phase-shift timing control to allow interleaved switching
of the power switches. The product’s architecture mini-
mizes the core voltage ripple and the input current ripple,
which leads to optimized voltage regulator design for
power density, transient responses, and thermal
performances.
To satisfy the highly dynamic nature of the modern micro-
processors, the SC2646B adopts peak current mode
control topology which ensures wide control loop band-
width and fast transient responses. The current mode
control provides intrinsic phase current matching. The
maximum ripple frequency is greater than 2MHz.
SC2646B
2, 3 or 4 Phase
Combi-SenseTM PWM Controller
Features
‹ VRD/VRM10.X compliant
‹ Core Voltage Set Point Accuracy 0.5%
‹ Combi-SenseTM Current Mode Control
‹ Intrinsic Phase Current Matching
‹ Fast Transient Responses
‹ Active Droop to Meet Load Line Slope
‹ Enable Function for Power Sequencing
‹ Cycle-by-Cycle Peak Current Limit
‹ Intelligent Over Current Shut Down
‹ Over Voltage Protection When Using Semtech
Combi-SenseTM Driver SC1211
‹ Under Voltage Protection Built in
‹ Externally Programmable Soft-Start
‹ Externally Programmable Switching Frequency
‹ 2, 3, or 4-Phase Configurations
‹ 24-Pin TSSOP Package
One of the outstanding features of the SC2646B device
is its voltage regulation accuracy. Not only does it pro-
vide 0.5% set point accuracy, but also the accuracy to
be fully compliant with stringent load line slope specifi-
cations mandated by the modern microprocessors.
Lossless output current sensing ensures the regulator
output voltage is accurately positioned according to the
load current condition.
Semtech’s patented Combi-SenseTM topology is employed
by SC2646B controller. The MOSFET Rds(on) and the out-
put inductor winding resistance is used to generate the
phase current information. Semtech’s SC1211 Combi-
SenseTM MOSFET driver works with the SC2646B to en-
able a complete solution.
Combi-SenseTM is a Trademark of Semtech Corporation
Applications
‹ Voltage Regulator VRD/VRM10.X
‹ Voltage Regulation Modules
‹ High Current, Low Voltage Step Down DC/DC
Converters
The cycle-by-cycle current limit plus the intelligent over
current shut down provide the maximum versatility of
the system without false tripping under all possible
changes of VID and load conditions. The differential
voltage feedback sense eliminates the error caused by
high load current on the ground plane. External offset is
easy to achieve for the VID settings. The enable func-
tion is also provided to interface with the corresponding
system signal for correct start up timing and shut down
timing.
Revision: Apr. 11, 2005
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SC2646B
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Typical Application Circuit
SC2646B
SC1211
5 VPN
CO 4
6 VIN
BST 3
7 VREG
TG 2
8 BG
DRN 1
SC1211
5 VPN
CO 4
6 VIN
BST 3
7 VREG
TG 2
8 BG
DRN 1
SC1211
5 VPN
CO 4
6 VIN
BST 3
7 VREG
TG 2
8 BG
DRN 1
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+ + + + + +++
© 2005 Semtech Corp.
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