EEWORLDEEWORLDEEWORLD

Part Number

Search

LTC3850IUF-PBF

Description
Dual, 2-Phase Synchronous Step-Down Switching Controller
File Size583KB,38 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC3850IUF-PBF Overview

Dual, 2-Phase Synchronous Step-Down Switching Controller

FEATURES
n
n
n
n
n
n
n
n
LTC3850/LTC3850-1
Dual, 2-Phase
Synchronous Step-Down
Switching Controller
DESCRIPTION
The LTC
®
3850 is a high performance dual synchronous
step-down switching regulator controller that drives all
N-channel power MOSFET stages. A constant-frequency
current mode architecture allows a phase-lockable fre-
quency of up to 780kHz. Power loss and supply noise are
minimized by operating the two controller output stages
out of phase.
OPTI-LOOP
®
compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The LTC3850 features a precision 0.8V
reference and a power good output indicator. A wide 4V to
24V (28V maximum/30V for LTC3850I) input supply range
encompasses most battery chemistries and intermediate
bus voltages.
Independent TK/SS pins for each controller ramp the
output voltages during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit condi-
tions. The MODE/PLLIN pin selects among Burst Mode
®
operation, pulse-skipping mode, or continuous inductor
current mode and allows the IC to be synchronized to an
external clock.
The LTC3850 is available in low profile 28-pin 4mm
×
4mm,
4mm
×
5mm QFN and narrow SSOP packages.
n
n
n
n
n
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
High Efficiency: Up to 95%
R
SENSE
or DCR Current Sensing
±1% 0.8V Output Voltage Accuracy
Phase-Lockable Fixed Frequency 250kHz to 780kHz
Supports Pre-Biased Output
Dual N-Channel MOSFET Synchronous Drive
Wide V
IN
Range: 4V to 24V (30V for LTC3850I)
Operation
Adjustable Soft-Start Current Ramping or Tracking
Foldback Output Current Limiting
Output Overvoltage Protection
Power Good Output Voltage Monitor
28-Pin 4mm
×
4mm, 4mm
×
5mm QFN and Narrow
SSOP Packages
APPLICATIONS
n
n
n
n
Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
L,
LT, LTC, LTM, OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.
Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.
TYPICAL APPLICATION
High Efficiency Dual 3.3V/2.5V Step-Down Converter
4.7µF
V
IN
PGOOD INTV
CC
0.1µF
2.2µH
TG1
BOOST1
SW1
BG1
2.2k
500kHz
I
LIM
0.1µF
SENSE1
+
RUN1
SENSE1
V
FB1
I
TH1
TK/SS1
0.1µF
SGND
TG2
BOOST2
SW2
BG2
PGND
FREQ/PLLFLTR
SENSE2
+
RUN2
SENSE2
V
FB2
I
TH2
TK/SS2
0.1µF
10nF
10k
0.1µF
43.2k
220pF
15k
20k
38501 TA01
22µF
50V
V
IN
7V TO
24V
Efficiency
100
V
IN
= 12V
95 V
OUT
= 3.3V
10000
EFFICIENCY
90
0.1µF
2.2µH
2.2k
EFFICIENCY (%)
85
80
75
70
65
60
55
V
OUT2
2.5V
5A
100µF
6V
50
10
100
1000
LOAD CURRENT (mA)
10
10000
38501 TA01b
POWER LOSS (mW)
1000
LTC3850
MODE/PLLIN
100
POWER LOSS
V
OUT1
3.3V
5A
100µF
6V
63.4k
220pF
20k
15k
38501fc
1

LTC3850IUF-PBF Related Products

LTC3850IUF-PBF LTC3850EGN-1PBF LTC3850EUFDTRPBF LTC3850IGN-1PBF LTC3850EUF-PBF
Description Dual, 2-Phase Synchronous Step-Down Switching Controller Dual, 2-Phase Synchronous Step-Down Switching Controller Dual, 2-Phase Synchronous Step-Down Switching Controller Dual, 2-Phase Synchronous Step-Down Switching Controller Dual, 2-Phase Synchronous Step-Down Switching Controller
Question: error: linking files for incompatible targets??
[i=s] This post was last edited by dontium on 2015-1-23 12:43 [/i] I built a project myself, and the compilation of a single file can be passed, but after linking, the following error occurs:[Linking....
虾段 Analogue and Mixed Signal
PXA270 driver for CF host port
The processor of the development board is PXA270. Now I want to install a CF wireless network card (NETGEAR MA701) on the board. Because the board is made by myself, I need to modify the interface dri...
yilingtang Embedded System
MSP430 MCU power switch sleep and wake-up program
Power switch sleep and wakeup: #include "msp430x42x.h" char TimeCount=0; //Blink timing char BT_IntervalFlag; //Timer interrupt global variable flag void main( void ) { DTCTL=WDTPW+WDTHOLD; //Stop wat...
fish001 Microcontroller MCU
SCI interrupt always can't enter
I spent the whole morning today and found that I couldn't enter the SCI interrupt program. The final solution was to re-read TI's SCI module manual and found that I had not set an enable bit, which ca...
安_然 Microcontroller MCU
Design and implementation of power measurement module
Design and implementation of power measurement module (Hardware design and implementation of power measurement module) Requirements: Design a module that can measure 8-way power (within 1Kw) with a si...
ffybl27 MCU
Book search: A practical guide to hardware-software collaborative design of embedded systems
Does anyone have an electronic version of "A Practical Guide to Embedded System Hardware and Software Co-design Based on Xilinx Zynq"? Can you share it?...
dell_00 FPGA/CPLD

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 2499  405  2853  923  1070  51  9  58  19  22 
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