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LTC1876EG#PBF

Description
IC REG CTRLR BUCK 36SSOP
Categorysemiconductor    Power management   
File Size119KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC1876EG#PBF Overview

IC REG CTRLR BUCK 36SSOP

LTC1876EG#PBF Parametric

Parameter NameAttribute value
Output typetransistor driver
Functionstep down
Output configurationjust
Topologystep down
Number of outputs3
output stage2
Voltage - Power Supply (Vcc/Vdd)3.5 V ~ 36 V
Frequency - Switch220kHz
Duty cycle (maximum)0.994
Synchronous rectifiernone
Clock synchronizationnone
serial interface-
Control characteristicsEnable, frequency control, power good, soft start
Operating temperature-40°C ~ 85°C(TA)
Package/casing36-SSOP (0.209", 5.30mm wide)
Supplier device packaging36-SSOP
DEMO BOARD MANUAL DC324
LTC1876 High Efficiency, Low Cost, 3-Output Power Supply
DESCRIPTION
Demonstration Board DC324 is a high efficiency, low cost design using the LTC
®
1876.
This demo board provides three regulated outputs from a single IC: 3.3V/5A, 5V/5A and
12V/200mA, along with two LDO outputs at 3.3V and 5V. Using only a small number of
surface mount components, this design is ideal for network equipment, notebook
computers and other portable applications that require low profile, small board area and
minimum system cost. High efficiency and low EMI are also achieved by operating the
two main power stages 180° out of phase, which, in turn, results in long battery life and
smaller input capacitors. All three main outputs can be adjusted externally and the 12V
regulator is configured to receive its input from the 3.3V output, the 5V output or an
external supply.
DC324 highlights the capabilities of the LTC1876, which incorporates a dual out-of-
phase, step-down switching controller and a step-up regulator with an internal 1A, 36V
switch. It uses a constant frequency, current mode architecture to provide excellent line
and load regulation for all three outputs. The operating frequency of the step-down
controller is DC programmable from 150kHz to 300kHz and the frequency of the step-up
regulator is fixed at 1.2MHz, allowing the use of tiny, low cost capacitors and inductors.
Protection features of the controller include an overvoltage soft latch, an overcurrent
latch-off (which can be externally defeated) and internal current foldback for overload
situations. At low output currents, two modes of operation are available: Burst Mode™
operation to maintain high efficiency and burst disable mode to maintain constant
frequency operation. The controller is also capable of very low dropout operation, with a
99% maximum duty cycle. To be compatible with battery operation, the input range of
this demo board is 7.5V to 24V for the 3.3V and 5V outputs and from 3V to10V for the
12V output.
Gerber files for this circuit board are available. Call the LTC factory.
PERFORMANCE SUMMARY (Operating Temperature Range: 0°C to 50°C)
PARAMETERS
Input Voltages
CONDITIONS
Step-Down Channels (V
OUT
= 5V and 3.3V); Limited by
External MOSFET Drive and Breakdown Requirement
Step-Up Channel (V
OUT
= 12V)
Step-Down Channel 1; Externally Adjustable
Step-Down Channel 2; Externally Adjustable
Step-Up Channel; Externally Adjustable
5V Linear Regulator
3.3V Linear Regulator
Step-Down Channels
V
IN2
= 3.3V
Step-Up Channel
V
IN2
= 10V
VALUE
5.2V to 30V
2.6V to 11V
5.00V
±
0.10V
3.30V
±
0.07V
12.00V
±
0.24V
5.00V
±
4%
3.30V
±
4%
0 to 5A, 6A Peak
200mA
600mA
Output Voltages
Load Currents

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