參數(shù)資料
型號: LTC3672BEDC-1#TRMPBF
廠商: Linear Technology
文件頁數(shù): 1/12頁
文件大?。?/td> 172K
描述: IC REG TRPL BCK/LINEAR 8-DFN
標(biāo)準(zhǔn)包裝: 1
拓?fù)洌?/td> 降壓(降壓)同步(1),線性(LDO)(2)
功能: 任何功能
輸出數(shù): 3
頻率 - 開關(guān): 2.25MHz
電壓/電流 - 輸出 1: 1.8V,400mA
電壓/電流 - 輸出 2: 1.2V,150mA
電壓/電流 - 輸出 3: 2.8V,150mA
帶 LED 驅(qū)動器:
帶監(jiān)控器:
帶序列發(fā)生器:
電源電壓: 2.9 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 8-DFN(2x2)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: LTC3672BEDC-1#TRMPBFDKR
LTC3672B-1
1
3672B1f
I
LOAD
 (mA)
0
400
350
300
250
200
150
100
50
3672b1 TA01b
100
95
90
85
80
75
70
65
60
V
IN
 = 2.9V
V
IN
 = 3.6V
V
IN
 = 5.5V
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Monolithic Fixed-Output
400mA Buck Regulator with Dual
150mA LDOs in 2mm ?2mm DFN
The LTC
?/DIV>
3672B-1 is a triple power supply composed of a
400mA synchronous buck regulator and two 150mA low-
dropout linear regulators (LDOs), where one of the LDOs
can be powered from the buck output to improve ef ciency.
Constant-frequency 2.25MHz operation is maintained
down to very light loads. The input supply range of 2.9V
to 5.5V is especially well-suited for single-cell Lithium-Ion
and Lithium-Polymer applications, and for powering low
voltage ASICs from 3.3V or 5V rails.
The LTC3672B-1 regulates 1.8V at the buck output, 1.2V
at the LDO1 output, and 2.8V at the LDO2 output. Exter-
nal component count is minimalall that is needed is a
single inductor, an input capacitor, and output capacitors
for each of the three outputs. Control loop compensation
is internal to the LTC3672B-1.
The LTC3672B-1 is available in a 2mm ?2mm ?0.75mm
8-Lead DFN package.
Buck DC/DC Ef ciency vs Load
?/DIV>
 Triple Output Supply From a Single 2.9V to 5.5V Input
?/DIV>
 Buck DC/DC: Fixed 1.8V Output, Up to 400mA
?/DIV>
 LDO1: Fixed 1.2V Output, Up to 150mA
?/DIV>
 LDO2: Fixed 2.8V Output, Up to 150mA
?/DIV>
 ?/SPAN>2.5% Reference Accuracy
?/DIV>
 Constant Frequency 2.25MHz Operation
?/DIV>
 Minimum External Component Count
?/DIV>
 Current Mode Operation for Excellent Line and Load
Transient Response
?/DIV>
 Internal Soft-Start for Each Output
?/DIV>
 Single Enable Pin Turns On/Shuts Down All Three
Outputs
?/DIV>
 Tiny 2mm ?2mm ?0.75mm DFN Package
?/DIV>
 DMB Cellphones
?/DIV>
 Handheld Products (PDA, PMP, GPS)
?/DIV>
 Multivoltage Power for Digital Logic, I/O, FPGAs,
CPLDs, ASICs, CPUs, and RF Chipsets
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC3672B-1
GND
ENALL
SW
V
OUT1
1.8V
400mA
(250mA IF LDO1
FULLY-LOADED)
V
OUT2
1.2V
150mA
2.2F
4.7H
ENABLE
INPUT
V
OUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
BUCKOUT
V
IN1
V
IN
LDO1
LDO2
3672b1 TA01
1F
1F
10F
V
IN
2.9V TO 5.5V
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