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參數(shù)資料
| 型號(hào)： | LTC3672BEDC-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 167K |
| 代理商： | LTC3672BEDC-1#PBF |
LTC3672B-1
1
3672B1f
ILOAD (mA)
0
EFFICIENCY
(%)
400
350
300
250
200
150
100
50
3672b1 TA01b
100
95
90
85
80
75
70
65
60
VIN = 2.9V
VIN = 3.6V
VIN = 5.5V
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Monolithic Fixed-Output
400mA Buck Regulator with Dual
150mA LDOs in 2mm
× 2mm DFN
The LTC3672B-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 efciency.
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 minimal—all 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 Efciency vs Load
■
Triple Output Supply From a Single 2.9V to 5.5V Input
■
Buck DC/DC: Fixed 1.8V Output, Up to 400mA
■
LDO1: Fixed 1.2V Output, Up to 150mA
■
LDO2: Fixed 2.8V Output, Up to 150mA
■
±2.5% Reference Accuracy
■
Constant Frequency 2.25MHz Operation
■
Minimum External Component Count
■
Current Mode Operation for Excellent Line and Load
Transient Response
■
Internal Soft-Start for Each Output
■
Single Enable Pin Turns On/Shuts Down All Three
Outputs
■
Tiny 2mm
× 2mm × 0.75mm DFN Package
■
DMB Cellphones
■
Handheld Products (PDA, PMP, GPS)
■
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
VOUT1
1.8V
400mA
(250mA IF LDO1
FULLY-LOADED)
VOUT2
1.2V
150mA
2.2 F
4.7 H
ENABLE
INPUT
VOUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
BUCKOUT
VIN1
VIN
LDO1
LDO2
3672b1 TA01
1 F
10 F
VIN
2.9V TO 5.5V
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