EEWORLDEEWORLDEEWORLD

Part Number

Search

LTC1709-7

Description
2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator
File Size322KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC1709-7 Overview

2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

FEATURES
s
LTC1709-7
2-Phase, 5-Bit VID,
Current Mode, High Efficiency,
Synchronous Step-Down Switching Regulator
DESCRIPTIO
The LTC
®
1709-7 is a 2-phase, VID programmable, synchro-
nous step-down switching regulator controller that drives
two all N-channel external power MOSFET stages in a fixed
frequency architecture. The 2-phase controller drives its two
output stages out of phase at frequencies up to 300kHz to
minimize the RMS ripple currents in both input and output
capacitors. The 2-phase technique effectively multiplies the
fundamental frequency by two, improving transient re-
sponse while operating each channel at an optimum fre-
quency for efficiency. Thermal design is also simplified.
An operating mode select pin (FCB) can be used to regu-
late a secondary winding or select among three modes
including Burst Mode
TM
operation for highest efficiency. An
internal differential amplifier provides true remote sensing
of the regulated supply’s positive and negative output ter-
minals as required in high current applications.
The RUN/SS pin provides soft-start and optional timed,
short-circuit shutdown. Current foldback limits MOSFET
dissipation during short-circuit conditions when the
overcurrent latchoff is disabled. OPTI-LOOP compensation
allows the transient response to be optimized for a wide
range of output capacitors and ESR values.
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation.
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Output Stages Operate Antiphase Reducing Input
Capacitance Requirements and Power Supply
Induced Noise
Dual Input Supply Capability for Load Sharing
5-Bit Mobile VID Code: V
OUT
= 0.925V to 2V
Current Mode Control Ensures Current Sharing
True Remote Sensing Differential Amplifier
Power Good Output Indicator
OPTI-LOOP
TM
Compensation Minimizes C
OUT
Three Operational Modes: PWM, Burst and Cycle Skip
Programmable Fixed Frequency: 150kHz to 300kHz
±1%
Output Voltage Accuracy
Wide V
IN
Range: 4V to 36V Operation
Adjustable Soft-Start Current Ramping
Internal Current Foldback and Short-Circuit Shutdown
Overvoltage Soft Latch Eliminates Nuisance Trips
Active Voltage Positioning Capable
Available in 36-Lead Narrow SSOP Package
APPLICATIO S
s
s
s
s
Mobile/Desktop Computers
Internet Servers
Large Memory Arrays
DC Power Distribution Systems
TYPICAL APPLICATIO
0.1µF
220pF
I
TH
SGND
PGOOD
5 VID BITS
FCB
+
V
IN
TG1
BOOST1
SW1
S
S
10µF
35V
×4
1µH
RUN/SS
3.3k
0.47µF
LTC1709-7
BG1
PGND
VID0–VID4
EAIN
ATTENOUT
ATTENIN
V
DIFFOUT
V
OS –
V
OS
+
SENSE1
+
SENSE1
TG2
BOOST2
SW2
BG2
INTV
CC
SENSE2
+
SENSE2
0.47µF
1µH
0.002Ω
10µF
+
Figure 1. High Current Dual Phase Step-Down Converter
U
U
U
V
IN
5V TO 28V
0.002Ω
V
OUT
0.925V TO 2V
40A
+
C
OUT
1000µF
4V
×2
170989 F01
1

LTC1709-7 Related Products

LTC1709-7 LTC1709EG-7
Description 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator
GR64 data transmission unit design
1 Implementation of GPRS data acquisition system communication Regardless of which method is used to access the Internet, the upper computer server must have a fixed IP address and open the correspond...
newnotion RF/Wirelessly
Automotive electronics upstream and downstream seek linkage1
Zheng Guowei, Deputy General Manager of Marketing Department of Fujitsu Microelectronics (Shanghai) Co., Ltd.:Focus on developing image processing chip and MCU market   The automotive electronics mark...
frozenviolet Automotive Electronics
Free technical assistance2
[table=98%] [tr][td][float=right] [/float] [font=宋体][backcolor=rgb(239, 245, 249)]I am a hardware electronics technician, and now I work in a company in Shanghai, doing technical research and developm...
House1989 stm32/stm8
Simple keyboard driver problem
I would like to ask, 1. Where is the table of correspondence between scan code and virtual key of CE6.0 defined? It seems that all tables are defined in g_pPdds, but I can't find where to assign value...
luliku Embedded System
Why is my Nboot from nand to SDRAM wrong?
Hi everyone! I am currently debugging a 2440 board. I plan to boot from nand flash (Samsung K9F1208U0C). After Nboot, I can see from axd that the values of NAND and mapped SRAM are correct. But when I...
lcl0720 Embedded System
Where can I buy microcontrollers?
I want to make a temperature controller and use a single-chip microcomputer to realize it, but what single-chip microcomputer should I use? ? What are the differences between ARM\DP801\DSP\...? Where ...
lghui Embedded System

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 2829  1272  2450  1250  2685  57  26  50  55  9 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号