SC2608AEVB SEMTECH [Semtech Corporation], SC2608AEVB Datasheet

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SC2608AEVB

Manufacturer Part Number
SC2608AEVB
Description
Simple, Synchronous Voltage Mode PWM Controller
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
POWER MANAGEMENT
The SC2608A is a versatile voltage-mode PWM control-
ler designed for use in step down DC/DC power supply
applications. A simple, fixed frequency, highly efficient
buck regulator can be implemented using the SC2608A
with minimal external components. The input voltage
range is from +5V to +12V. Internal level shift and drive
circuitry eliminates the need for an expensive P-channel,
high-side MOSFET. The small device footprint allows for
compact circuit design.
SC2608A features include temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator, and an externally compensated error ampli-
fier. Current limit is implemented by sensing the voltage
drop across the bottom MOSFET R
The SC2608A operates at a fixed frequency of 250kHz
providing an optimum compromise between efficiency ,
external component size, and cost.
SC2608A has a thermal protection circuit, which is
activated if the junction temperature exceeds 150
Typical Application Circuit
Description
Revision 2: April, 2006
SC2608
SC2608A
COMP/SS
GND
DL
DH
DS(ON)
SENSE
PHASE
VCC
BST
.
O
Figure 1
C.
+12V
sense
1
Features
Applications
+5V or +12V input voltage
250kHz operation
High efficiency (>90%)
1.5% Reference voltage accuracy
Hiccup mode over current protection
Robust output drive
R
Industrial temperature range
SO-8 package
Integrated boot strap diode
Thermal Shut down
Fully WEEE and RoHS Compliant
Termination supplies
Low cost microprocessor supplies
Peripheral card supplies
Industrial power supplies
High density DC/DC conversion
DS(ON)
Voltage Mode PWM Controller
Current sensing for protection
+12V/+5V/+3.3V
Simple, Synchronous
SC2608A
sense
www.semtech.com
VOUT

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SC2608AEVB Summary of contents

Page 1

POWER MANAGEMENT Description The SC2608A is a versatile voltage-mode PWM control- ler designed for use in step down DC/DC power supply applications. A simple, fixed frequency, highly efficient buck regulator can be implemented using the SC2608A with minimal external components. ...

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POWER MANAGEMENT Gate Drive Timing Diagram Block Diagram REF 0.8V E/A + SENSE - 2006 Semtech Corp. © Figure 2 OSC PWM VCC OCP & UVLO OCP PHASE COMP/SS Figure 3 4 ...

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POWER MANAGEMENT Pin Configuration Top View 1 BST 2 DH GND (8-Pin SO-8 ) Pin Descriptions ...

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POWER MANAGEMENT Theory of Operation Synchronous Buck Converter Synchronous Buck Converter Synchronous Buck Converter Synchronous Buck Converter Synchronous Buck Converter The output voltage of the synchronous converter is set and controlled by the output of the error amplifier. The inverting ...

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POWER MANAGEMENT Applications Information (Cont.) A note to the user is needed: The device cannot restart until both COMP and SENSE are low, to prevent start up into a charged output. In the event of an overcurrent condition, the output ...

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POWER MANAGEMENT Applications Information (Cont.) (5) The compensation capacitor is determined by choos- ing the compensator zero to be about one fifth of the output filter corner frequency zero π • 2 ...

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POWER MANAGEMENT Typical Performance Characteristics vs ture ...

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POWER MANAGEMENT Application Information Typical Application Schematic ypical Application Schematic ypical Application Schematic ypical Application Schematic ypical Application Schematic C4 U1 100pF 8 Phase 7 COMP/ 68nF 6 Sense SENSE 5 +12V VCC ...

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POWER MANAGEMENT Typical Performance Characteristics Efficiency V. S. Load Current Transient Response COMP/SS COMP/SS VOUT VOUT IL(10A/DIV) IL(10A/DIV) 5 -18 A step ...

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POWER MANAGEMENT Application Information Typical DDR VDDQ Application Schematic ypical DDR VDDQ Application Schematic ypical DDR VDDQ Application Schematic ypical DDR VDDQ Application Schematic ypical DDR VDDQ Application Schematic C5 U1 100pF 8 Phase 7 COMP/SS ...

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POWER MANAGEMENT Application Information Typical High In ypical High In ypical High Input V ypical High In put Voltage Application Schematic put V put V oltage Application Schematic oltage Application Schematic oltage Application Schematic ypical High ...

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POWER MANAGEMENT Outline Drawing - SO ...

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POWER MANAGEMENT Land Pattern - SO-8 X (C) P 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. Contact Information 2006 ...

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