EEWORLDEEWORLDEEWORLD

Part Number

Search

LTC1876

Description
High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator
File Size411KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC1876 Overview

High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator

LTC1876
High Efficiency, 2-Phase,
Dual Synchronous Step-Down Switching
Controller and Step-Up Regulator
DESCRIPTIO
The LTC
®
1876 is a high performance triple output switching
regulator. It incorporates a dual step-down switching con-
troller that drives all N-channel synchronous power MOSFET
stages. A step-up regulator with an internal 1A, 36V switch
provides the third output.
The step-down controllers minimize power loss and noise
by operating the output stage of each controller out of
phase. OPTI-LOOP compensation allows the transient
response to be optimized over a wide range of output
capacitance and ESR values. A RUN/SS pin for each
controller provides both soft-start and an optional timed,
short-circuit shutdown that can be configured to latch off
one or both controllers. Current foldback provides
additional short-circuit protection. In an overvoltage
condition, the bottom MOSFET is latched on until V
OUT
returns to normal. The FCB pin can be used to inhibit Burst
Mode operation or to enable regulation of a secondary
output voltage.
The step-up regulator operates at 1.2MHz, allowing the
use of tiny low cost capacitors and inductors. In addition,
its internal 1A switch allows high current outputs to be
generated. Its current mode control scheme provides
excellent line and load regulation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
FEATURES
Step-Down Controller
s
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
s
Power Good Output Voltage Indicator
s
OPTI-LOOP
TM
Compensation Minimizes C
OUT
s
DC Programmed Fixed Frequency 150kHz to 300kHz
s
Wide V Range: 3.5V to 36V Operation
IN
s
Very Low Dropout Operation: 99% Duty Cycle
s
Adjustable Soft-Start Current Ramping
s
Latched Short-Circuit Shutdown with Defeat Option
s
Remote Output Voltage Sense and OV Protection
s
5V and 3.3V Standby Regulators
s
Selectable Const. Freq. or Burst Mode
TM
Operation
Step-Up Regulator
s
High Operating Switching Frequency of 1.2MHz
s
Low Internal V
CESAT
Switch: 400mV @ 1A, V
IN
= 3V
s
Wide V Range: 2.6V to 16V Operation
IN
s
High Output Voltage: Up to 34V
APPLICATIO S
s
s
s
3.3V Input Step-Down Converter
Notebook and Palmtop Computers, PDAs
Battery-Operated Digital Devices
TYPICAL APPLICATIO
V
IN
5.2V
TO 28V 33µF
35V
ALUM
+
10µF
35V
CER
M3
1µF
CER
0.1µF
+
INTV
CC
AUXV
IN
TG2
BOOST2
SW2
LTC1876
V
IN
TG1
BOOST1
SW1
BG1
AUXSW
PGND
PGOOD
AUXV
FB
AUXSD
+
4.7µF
10V
M1
10µF
20V
0.1µF
6.3µH
M4
BG2
0.01Ω
V
OUT2
3.3V
5A
1000pF
SENSE2
SENSE1
+
SENSE1
V
OSENSE1
I
TH1
220pF
15k
1000pF
SENSE2
V
OSENSE2
I
TH2
220pF
15k
+
56µF
4V
SP
63.4k
1%
20k
1%
RUN/SS2 SGND RUN/SS1
0.1µF
0.1µF
10.2k
1%
Figure 1. High Efficiency Triple 5V/3.3V/12V Power Supply
U
U
U
10µH
V
OUT3
12V
200mA
+
6.8µH
M2
86.6k,
1%
0.01Ω
V
OUT1
5V
4A
105k
1%
20k
1%
M1, M2, M3, M4: FDS6680A
+
47µF
6.3V
SP
1876 TA01
1876fa
1

LTC1876 Related Products

LTC1876 LTC1876EG
Description High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator
Talk about my achievements
I have been engaged in the development and application of single-chip microcomputers for a long time and have accumulated a certain amount of experience. I have integrated my life-long research experi...
zhull1984 Embedded System
In addition to optocouplers and transistors, what other controllable switching elements are there?
I recently designed a circuit that uses a switch controlled by a single-chip microcomputer. I originally used a 9014 transistor, but later changed it to a high-speed optocoupler because the switching ...
作死教练 Analog electronics
Anyone who has used LCD please come over and help me!
I need to make a phone now! It can display my profile picture! I need a color LCD. I wonder if the LCD with driver sold in the market can be directly connected to the IO port of ARM processor? Ordinar...
xiaoyu07057 Embedded System
Can WINCE achieve 5000 interrupts per second? Has anyone done it? Please enlighten me.
Wince5.0 hardware triggers interrupt No. 7 of X86CUP with 5000 pulses per second. Can Wince completely capture every interrupt and ensure that it is not lost? Brothers and sisters who have done this b...
GZCYGS Embedded System
Help: usrRoot has been executed, but the blue screen boot interface cannot be seen?
[color=#0000FF]Tracking the code, I found that usrRoot has been executed, but it has never jumped to the blue screen interface of boot. Can anyone tell me why? Thank you! [/color] I am using VxWorks6....
liwei5613 Embedded System
How to use MSP430G2553 comparator CAOUT as the input of TA counter?
[i=s]This post was last edited by danruofeng on 2015-5-14 17:42[/i] How to set CAOUT as the capture source of the timer?...
danruofeng Microcontroller MCU

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 1869  2370  1238  2321  459  38  48  25  47  10 
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