SC2602ASTRT SEMTECH [Semtech Corporation], SC2602ASTRT Datasheet

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SC2602ASTRT

Manufacturer Part Number
SC2602ASTRT
Description
Synchronous Voltage Mode Controller for Distributed Power Supply Applications
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
1.SC2602ASTRT.pdf (16 pages)
The SC2602 and SC2602A are low-cost, full featured,
synchronous voltage-mode controllers designed for use
in single ended power supply applications where efficiency
is of primary concern. Synchronous operation allows for
the elimination of heat sinks in many applications. The
SC2602s are ideal for implementing DC/DC converters
needed to power advanced microprocessors in low cost
systems, or in distributed power applications where effi-
ciency is important. Internal level-shift, high-side drive
circuitry, and preset shoot-thru control, allows the use of
inexpensive N-channel power switches.
SC2602s features include temperature compensated
voltage reference, triangle wave oscillator and current
sense comparator circuitry. Power good signaling, shut-
down, and over voltage protection are also provided.
The SC2602 operates at a fixed 200kHz and the
SC2602A at 500kHz, providing a choice for optimum
compromise between efficiency, external component size,
and cost.
Two SC2602s can be used together to sequence power up
of telecom systems. The power good of the first SC2602
connected to the enable of the second SC2602 makes
this possible.
POWER MANAGEMENT
Revision: October 13, 2004
Description
Typical Application Circuit
Typical Distributed Power Supply
Figure 1.
OVP
PWRGD
R1
1k
+5V
0.1
R2
0.1
C1
R3
1k
0.1
MBR0520
C2
D1
1
2
3
4
5
6
7
R4
10
VCC
OVP
OCSET
PHASE
DRVH
PGND
PWRGD
SC2602
U1
SS/SHDN
SENSE
COMP
DRVL
BSTH
BSTL
GND
9
8
14
13
12
11
10
4.99K
C3
0.1
for Distributed Power Supply Applications
820pF
1.0
C4
Synchronous Voltage Mode Controller
+12V
3.9
2.2
SHDN
R5
R6
1
Features
Applications
Synchronous operation for high efficiency (95%)
R
On-chip power good and OVP functions
Small size with minimum external components
Soft Start
Enable function
Microprocessor core supply
Low cost synchronous applications
Voltage Regulator Modules (VRM)
DDR termination supplies
Networking power supplies
Sequenced power supplies
STP40NE
STP40NE
Q1
Q2
DS(ON)
current sensing
NOTE:
L1
2uH
*) Vout = 1.265 x (1+R8/R7)
10.0
C5
R7
127
C9
180/4V
C6
680/6.3V
SC2602/SC2602A
C10
180/4V
R8
124*
C7
680/6.3V
C11
180/4V
C8
680/6.3V
C12
180/4V
_
+
Vin
5V
C13
180/4V
www.semtech.com
Vout=2.5V
+
_
*

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SC2602ASTRT Summary of contents

Page 1

POWER MANAGEMENT Description The SC2602 and SC2602A are low-cost, full featured, synchronous voltage-mode controllers designed for use in single ended power supply applications where efficiency is of primary concern. Synchronous operation allows for the elimination of heat sinks in many ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings 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 ...

Page 3

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 4.75V to 12.6V; GND = PGND = 0V ...

Page 4

POWER MANAGEMENT Pin Configuration Top View VCC PWRGD OVP OCSET PHASE DH PGND (14-Pin SOIC) Pin Descriptions ...

Page 5

POWER MANAGEMENT Block Diagram Theory of Operation Synchronous Buck Converter Primary V power is provided by a synchronous, volt- CORE age-mode pulse width modulated (PWM) controller. This section has all the features required to build a high effi- ciency synchronous ...

Page 6

POWER MANAGEMENT Applications Information (Cont.) Soft Start Initially, SS/SHDN sources 10µA of current to charge an external capacitor. The outputs of the error amplifiers are clamped to a voltage proportional to the voltage on SS/SHDN. This limits the on-time of ...

Page 7

POWER MANAGEMENT Application Circuit Typical 12V Application Circuit with Bootstrapped BSTH + 1.74k C2 SC2602 0.1 0.1 1 VCC PWRGD 2 PWRGD SS/SHDN OVP COMP OVP 4 OCSET SENSE 5 ...

Page 8

POWER MANAGEMENT Typical Characteristics Output Ripple Voltage Ch1: Vo_rpl 5V 3.3V 12A IN O OUT PIN Descriptions Ch1: Vo_rpl 5V 1.3V 12A IN OUT OUT 2004 ...

Page 9

POWER MANAGEMENT Typical Characteristics (Cont.) Ch1: Vo_rpl 5V 1.3V 12A IN OUT OUT 2004 Semtech Corp. SC2602/SC2602A Ch1: Top FET Ch2: Bottom FET 9 www.semtech.com ...

Page 10

POWER MANAGEMENT Typical Characteristics (Cont.) Hiccup Mode Start Up Mode 2004 Semtech Corp. SC2602/SC2602A Ch1: Vin Ch2: Vss Ch3: Top Gate Ch4: Vout Vin = 5V Vout = 3.3V Vbst = 12V Iout = S.C. Iout = S.C. Iout = ...

Page 11

POWER MANAGEMENT Typical Characteristics (Cont.) Math Cad Close Loop Stability Analysis Output Filter Schematic: 2004 Semtech Corp. SC2602/SC2602A 11 www.semtech.com ...

Page 12

POWER MANAGEMENT Typical Characteristics (Cont.) Error Amplifier Schematic 2004 Semtech Corp. SC2602/SC2602A 12 www.semtech.com ...

Page 13

POWER MANAGEMENT Typical Characteristics (Cont.) 2004 Semtech Corp. SC2602/SC2602A 13 www.semtech.com ...

Page 14

POWER MANAGEMENT Typical Characteristics (Cont.) 2004 Semtech Corp. SC2602/SC2602A 14 www.semtech.com ...

Page 15

POWER MANAGEMENT Evaluation Board Schematic 2004 Semtech Corp. SC2602/SC2602A 15 www.semtech.com ...

Page 16

POWER MANAGEMENT Outline Drawing - S0- ccc C 2X N/2 TIPS aaa C SEATING PLANE C SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- 3. DIMENSIONS "E1" AND "D" ...

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