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LTC1553CG Datasheet

  • LTC1553CG

  • 5-Bit Programmable Synchronous Switching Regulator Controlle...

  • 402.27KB

  • 24頁

  • LINER

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LTC1553
5-Bit Programmable
Synchronous Switching
Regulator Controller for
Pentium
廬
II Processor
FEATURES
s
s
DESCRIPTION
The LTC
廬
1553 is a high power, high efficiency switching
regulator controller optimized for 5V or 12V input to 1.8V-
3.5V output applications. It features a digitally programmable
output voltage, a precision internal reference and an internal
feedback system that provides output accuracy of
鹵1.5%
at
room temperature and typically
鹵2%
over-temperature, load
current and line voltage shifts. The LTC1553 uses a synchro-
nous switching architecture with two external N-channel
output devices, providing high efficiency and eliminating the
need for a high power, high cost P-channel device. Addition-
ally, it senses the output current across the on-resistance of
the upper N-channel FET, providing an adjustable current
limit without an external low value sense resistor.
The LTC1553 free-runs at 300kHz and can be synchronized
to a faster external clock if desired. It includes all the inputs
and outputs required to implement a power supply conform-
ing to the
Intel Pentium
廬
II Processor VRM 8.2 DC/DC
Converter Specification.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
s
s
s
s
s
s
s
s
s
5-Bit Digitally Programmable 1.8V to 3.5V Fixed
Output Voltage
Provides All Features Required by the
Intel
Pentium
廬
II Processor VRM 8.2 DC/DC
Converter Specification
Flags for Power Good, Over-Temperature and
Overvoltage Fault
19A Output Current Capability from a 5V or 12V Supply
Dual N-Channel MOSFET Synchronous Driver
Initial Output Accuracy:
鹵1.5%
Excellent Output Accuracy:
鹵2%
Typ Over Line,
Load and Temperature Variations
High Efficiency: Over 95% Possible
Adjustable Current Limit Without External Sense
Resistors
Fast Transient Response
Available in 20-Lead SSOP and SW Packages
APPLICATIONS
s
s
Power Supply for Pentium II, SPARC, ALPHA and
PA-RISC Microprocessors
High Power 5V or 12V to 1.8V-3.5V Regulators
TYPICAL APPLICATION
+
0.1碌F
5.6k
5.6k
5.6k
V
CC
I
MAX
10碌F
2.7k
PV
CC
12V
V
IN
5V
+
0.1碌F
10碌F
PWRGD
PENTIUM II
SYSTEM
廬
PV
CC
G1
20鈩?/div>
Q1*
L
O
鈥?/div>
2碌H
18A
C
OUT
鈥犫€?/div>
330碌F
脳
7
V
OUT
1.8V TO
3.5V
14A
FAULT
5
OT
VID0 TO VID4
OUTEN
COMP
C1
150pF
R
C
8.2k
C
C
0.01碌F
SS
SGND
GND
SENSE
LTC1553
I
FB
G2
Q2*
C
SS
0.1碌F
0.1碌F
*SILICONIX SUD50N03-10
**SANYO 10MV1200GX
鈥?/div>
COILTRONICS CTX02-13198 OR
PANASONIC 12TS-2R5SP
鈥犫€?/div>
AVX TPSE337M006R0100
Figure 1. 5V to 1.8V-3.5V Supply Application
U
U
U
+
C
IN
**
1200碌F
脳
4
+
1553 F01
1

LTC1553CG 產(chǎn)品屬性

  • LTC1553

  • 66

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，Intel Pentium? II

  • 5V，12V

  • 1

  • 1.8 V ~ 3.5 V

  • 0°C ~ 70°C

  • 表面貼裝

  • 20-SSOP（0.209"，5.30mm 寬）

  • 20-SSOP

  • 管件

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