sc1110cstr Semtech Corporation, sc1110cstr Datasheet

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sc1110cstr

Manufacturer Part Number
sc1110cstr
Description
Sc1110 Sink And Source Dc/dc Controller For Termination Power Supply Applications
Manufacturer
Semtech Corporation
Datasheet

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The SC1110 is a low-cost, full featured, synchronous
voltage-mode controller designed to generate
termination voltage in double data rate (DDR) memory
systems and other applications where wide data bus
need to be actively terminated. Synchronous control of
the MOSFET half bridge allows power flowing
bi-directionally. The termination voltage can be tightly
regulated to track the chipset voltage, i.e. to be exactly
50% of that at all times.
The SC1110 is ideal for low cost implementation of
termination voltage supplies. SC1110 features include
temperature compensated voltage reference, triangle
wave oscillator and current sense comparator circuitry,
and allows the use of inexpensive N-channel power
MOSFETs.
The SC1110 operates at a fixed 250kHz, providing an
optimum compromise between efficiency, transient
performance, external component size, and cost.
POWER MANAGEMENT
Revision: July 20, 2004
Description
Typical Application Circuit
REFOUT
SS/ENBL
PWRGD
R1
5k
C25
0.1
C1
0.01
C3
0.1
R2
1.24k
C2
0.1
C10-14: Sanyo, 4SP560M
C8,9,15-24: TDK, CC3216AX5R0J106K
L1: Panasonic, ETQP6F0R8L or Falco, QPIP1205-809-3
Q1,Q2 options: Si9426DY, FDS6890A, IRF7401
D1: ON Semi (Motorola)
R3
10
1
2
3
4
5
6
7
VCC
SS/ENBL
OCSET
PWRGD
GND
PHASE
DL
U1
SC1110
REFOUT
SENSE
REFIN
COMP
BSTH
BSTL
DH
14
13
12
11
10
9
8
R4
1k
R6
4.7k
Termination Power Supply Applications
Sink and Source DC/DC Controller for
C4
0.022
R5
1k
C5
0.047
MBRM120
D1
1
R7
2.2
R8
2.2
Features
Applications
Generates termination voltages for active termina-
tion schemes
1% set point accuracy
For ±7A output current, transient regulation is
better than ±80mV
V
to allow termination voltage track of the chip set
voltage
Buffered V
R
mode
Soft start and logic input enabling
250kHz switching for best transient and efficiency
performance
Gate drive capable for 0.5A sourcing and sinking
For DDR memory systems
For active termination schemes in high speed logic
systems
REFIN
DSON
Si9426DY
Si9426DY
Q1
Q2
pin available for external 50% resistive divider
sensing for over current protection in hiccup
C7
1.0
REFOUT
C6
1.0
C8,9
2 x 10uF
800 nH
L1
for system usage
C12-14
3 x 560uF
C10,11
2 x 560uF
10 x 10uF
C15-24
Vin 2.5V
+5Vcc
+
_
Vout = 1.25V @ 7A
+
_
SC1110
www.semtech.com

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sc1110cstr Summary of contents

Page 1

POWER MANAGEMENT Description The SC1110 is a low-cost, full featured, synchronous voltage-mode controller designed to generate termination voltage in double data rate (DDR) memory systems and other applications where wide data bus need to be actively terminated. Synchronous control of ...

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 Timing Diagrams SIMULA SIMULA SIMULA SIMULATION W SIMULA TION W TION W TION W TION VEF VEF VEFORMS VEF VEF ORMS ORMS ORMS ORMS Output current of the VTT supply 2004 Semtech Corp. ...

Page 5

POWER MANAGEMENT Pin Configuration (14 Pin SOIC or TSSOP) Pin Descriptions ...

Page 6

POWER MANAGEMENT Block Diagram Applications Information THEORY OF OPERATION Synchronous Buck Converter V power is provided by a synchronous, voltage- TERMINATION mode pulse width modulated (PWM) controller. This sec- tion has all the features required to build a high efficiency ...

Page 7

POWER MANAGEMENT Applications Information Soft Start Initially, SS/ENABLE 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/ENABLE. This limits the on-time of the ...

Page 8

POWER MANAGEMENT Typical Characteristics 95% 90% 85% 80% 75% 70% 65% 60% 0 1.0% 0.5% 0.0% -0.5% -1.0% 0 2004 Semtech Corp Current Current, A ...

Page 9

POWER MANAGEMENT Evaluation Board 2004 Semtech Corp. Top View Bottom View 9 SC1110 www.semtech.com ...

Page 10

POWER MANAGEMENT Evaluation Board (Cont.) Top Copper Midlayer 1 2004 Semtech Corp. Bottom Copper Midlayer 2 10 SC1110 www.semtech.com ...

Page 11

POWER MANAGEMENT Outline Drawing - SO-14 Land Pattern - SO-14 2004 Semtech Corp. 11 SC1110 www.semtech.com ...

Page 12

... POWER MANAGEMENT Outline Drawing - TSSOP-14 Land Pattern - TSSOP-14 Contact Information Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 12 SC1110 www.semtech.com ...

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