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DC1324A

Description
board eval for ltc3672bedc
CategoryDevelopment board/suite/development tools   
File Size296KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC1324A Overview

board eval for ltc3672bedc

DEMO CIRCUIT 1324A
PDC
QUICK START GUIDE
LTC3672BEDC-2: Monolithic
Fixed-Output 400mA Buck Regulator with Dual
150mA LDOs in 2mm X 2mm DFN
DESCRIPTION
Demonstration Circuit 1324A is a monolithic 400mA
Buck regulator, with fixed output, and two 150mA,
Low Drop Out linear regulators. These are housed in
an 8 lead, 2mm X 2mm DFN package.
Design files for this circuit board are available. Call
the LTC factory.
L
, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered
trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy
Drive, FilterCAD, Hot Swap, LinearView, μModule, Micropower SwitcherCAD, Multimode
Dimming, No Latency
ΔΣ,
No Latency Delta-Sigma, No R
SENSE
, Operational Filter, PanelProtect,
PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT,
UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names
may be trademarks of the companies that manufacture the products.
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C
SYMBOL
VIN
VOUT1
VOUT2
VOUT3
PARAMETER
Input voltage
Output of regulator (buck) 1
Output of LDO1
Output of LDO2
CONDITIONS
I
OUT1
≤ 400mA
I
OUT2
≤ 150mA. Subject to dropout limitations.
IOUT3 ≤ 150mA
MIN
2.9
1.17
2.73
1.755
TYP
MAX
5.5
1.23
2.87
1.845
UNITS
V
V
V
V
OPERATING PRINCIPLES
The LTC3672BEDC-2 is a monolithic fixed output,
400mA, synchronous buck regulator and two 150mA
LDOS.
Efficiency [%]
LTC3672BEDC-1
VOUT = 1.2V
100
90
80
70
60
50
40
30
20
0
100
200
300
400
LOAD CURRENT [mA]
VOUT1 is driven by a high efficiency synchronous buck
regulator with a fixed output of 1.2V. The buck regulator
on the LTC3672BEDC-2 operates at approximately
2.25MHz, allowing the use of small inductors and
capacitors.
The two fixed output LDOs, have a maximum dropout
voltage of 250mV, over process and temperature. This
allows all three outputs to remain in regulation with VIN
as low as 2.98V.
All of the regulators on the LTC3672BEDC-2 are enabled
via the ENALL pin, controlled by JP1.
Efficiency of the Buck regulator at VIN = 3.6V
1

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DC1324A LTC3672BEDC-2#TRMPBF LTC3672BEDC-2#TRPBF
Description board eval for ltc3672bedc IC REG TRPL BCK/LINEAR 8-DFN IC REG TRPL BCK/LINEAR 8-DFN
Topology - Buck Synchronous (1), Linear (LDO) (2) Buck Synchronous (1), Linear (LDO) (2)
Number of outputs - 3 3
Frequency - Switch - 2.25MHz 2.25MHz
Voltage/Current - Output 1 - 1.2V,400mA 1.2V,400mA
Voltage/Current - Output 2 - 2.8V,150mA 2.8V,150mA
Voltage/Current - Output 3 - 1.8V,150mA 1.8V,150mA
With LED driver - none none
With monitor - none none
with sequencer - none none
Voltage - Power - 2.9 V ~ 5.5 V 2.9 V ~ 5.5 V
Operating temperature - -40°C ~ 85°C -40°C ~ 85°C
Installation type - surface mount surface mount
Package/casing - 8-WFDFN Exposed Pad 8-WFDFN Exposed Pad
Supplier device packaging - 8-DFN(2x2) 8-DFN(2x2)
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