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LTC1753CG Datasheet

  • LTC1753CG

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

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LTC1753
5-Bit Programmable
Synchronous Switching
Regulator Controller for
Pentium
廬
III Processor
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
5-Bit Digitally Programmable 1.3V to 3.5V Fixed
Output Voltage, VRM 8.4 Compliant
Fast Transient Response: 0% to 100% Duty Cycle
Phase Lead Compensation for Remote Sensing
Overtemperature Protection
Flags for Power Good and Overvoltage Fault
19A Output Current Capability from a 5V 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
Available in 2O-Lead SSOP and SW Packages
APPLICATIO S
s
s
Power Supply for Pentium
廬
III, AMD-K6
廬
-2, SPARC,
ALPHA and PA-RISC Microprocessors
High Power 5V to 1.3V-3.5V Regulators
The LTC
廬
1753 is a high power, high efficiency switching
regulator controller optimized for 5V input to a digitally
programmable 1.3V-3.5V output. The internal 5-bit DAC
programs the output voltage from 1.3V to 2.05V in 50mV
increments and from 2.1V to 3.5V in 100mV increments. The
precision internal reference and an internal feedback system
provide an output accuracy of
鹵1.5%
at room temperature
and typically
鹵2%
over temperature, load current and line
voltage shifts. The LTC1753 uses a synchronous 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. Additionally, 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 LTC1753 free-runs at 300kHz and can be synchronized
to a faster external clock if desired. It provides a phase lead
compensation scheme and under harsh loading conditions,
the PWM duty cycle can be momentarily forced to 0% or
100% to reduce the output voltage recovery time.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
AMD-K6 is a registered trademark of Advanced Micro Devices, Inc.
TYPICAL APPLICATIO
5.6k
PV
CC
12V
V
IN
5V
+
0.1碌F
5.6k
10碌F
600鈩?/div>
0.1碌F
+
10碌F
Q1A*
PWRGD
FAULT
CPU
5
VID0 TO VID4
OUTEN
COMP
R
C
15k
C
C
4700pF
SS
SGND
GND
SENSE
LTC1753
Q2A*
G2
V
FB
NC
Q2*
V
CC
I
MAX
PV
CC
G1
20鈩?/div>
I
FB
C
OUT
鈥犫€?/div>
2700碌F
脳
5
Q1*
L
O
鈥?/div>
1.3碌H
18A
V
OUT
1.3V TO
3.5V
14A
C1
150pF
C
SS
0.1碌F
1碌F
* SILICONIX SUD50N03-10
** SANYO 10MV1200GX
鈥?/div>
PANASONIC ETQP 6FIR3LFA
鈥犫€?/div>
SANYO 6MV2700GX
Figure 1. 5V to 1.3V-3.5V Supply Application
U
+
C
IN
**
1200碌F
脳
4
U
U
+
1753 F01
1

LTC1753CG 產(chǎn)品屬性

  • LTC1753

  • 66

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專(zhuān)用型

  • -

  • 控制器，Intel Pentium? III

  • 5V

  • 1

  • 1.3 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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