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LTC3112

更新时间： 2024-11-14 14:57:27
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
32页 633K
描述
15V、2.5A 同步降压-升压型 DC/DC 转换器

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LTC3112 数据手册

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LTC3112  
15V, 2.5A Synchronous  
Buck-Boost DC/DC  
Converter  
FEATURES  
DESCRIPTION  
TheLTC®3112isafixedfrequencysynchronousbuck-boost  
DC/DC converterwith an extended input and output range.  
Theunique4-switch,singleinductorarchitectureprovides  
low noise and seamless operation from input voltages  
above, below or equal to the output voltage.  
n
Regulated Output with V Above, Below or Equal to V  
IN  
OUT  
n
2.7V to 15V Input Voltage Range  
n
2.5V to 14V Output Voltage Range  
2.5A Continuous Output Current: V ≥ 5V,  
n
IN  
V
= 5V, PWM Mode  
OUT  
n
n
n
Output Current Monitor  
With an input range of 2.7V to 15V, the LTC3112 is well-  
suited for a wide variety of single or multiple cell battery,  
backup capacitororwall adaptersourceapplications. Low  
Up to 95% Efficiency  
750kHz Switching Frequency, Synchronizable  
Between 300kHz and 1.5MHz  
Internal N-Channel MOSFETs  
R
internal N-Channel MOSFET switches provide  
DS(ON)  
n
n
n
n
n
n
n
highly efficient operation in applications with higher load  
Selectable Burst Mode® Operation, I = 50µA  
Q
current requirements.  
Shutdown Current < 1µA  
Overvoltage Protection  
Output Disconnect in Shutdown  
Internal Soft-Start  
Small, Thermally Enhanced 16-Lead (4mm × 5mm ×  
0.75mm) DFN and 20-Lead TSSOP Package  
The LTC3112 features selectable PWM or Burst Mode  
operation, an easily synchronized oscillator and output  
disconnectinshutdown. Anoutputcurrentmonitorcircuit  
allowstheloadcurrenttobecontrolledormeasured.Other  
features include <1µA shutdown current, short circuit  
protection, soft-start, currentlimitandthermalshutdown.  
APPLICATIONS  
The LTC3112 is offered in both a 16-pin (4mm × 5mm ×  
0.75mm) DFN and 20-pin TSSOP packages.  
n
3.3V or 5V from 1, 2 or 3 Li-Ion, Backup Capacitor Stack  
n
Hand Held Inventory Terminals  
L, LT, LTC, LTM, Linear Technology Burst Mode, LTSpice and the Linear logo are registered  
trademarks and No R  
and PowerPath are trademarks of Linear Technology Corporation.  
n
SENSE  
RF Transmitters  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 5481178.  
n
12V Synchronous Boost Converter  
n
Multiple Power Input Systems  
n
LED Lighting with Current Regulation  
n
12V Lead Acid Battery to 12V  
TYPICAL APPLICATION  
Efficiency at 5VOUT  
100  
5V, 750kHz Wide Input Voltage Range Buck-Boost Regulator  
PWM  
90  
4.7µH  
BURST  
80  
70  
0.1µF  
0.1µF  
SW1  
SW2  
BST1  
BST2  
5V/2.5A, V > 5V  
IN  
2.7V TO 15V  
10µF  
V
V
OUT  
V
OUT  
V
IN  
IN  
33k  
60  
680pF  
47pF  
LTC3112  
V
COMP  
CC  
845k  
10k  
22pF  
BURST PWM  
OFF ON  
PWM/SYNC  
50  
40  
FB  
OUT  
TO ADC  
1V PER AMP  
100pF 42.2k  
RUN  
GND  
I
2.7V  
5.0V  
12V  
IN  
IN  
47µF  
OVP  
1µF  
158k  
IN  
30  
0.0001 0.001  
0.01  
0.1  
1
3112 TA01  
LOAD CURRENT (A)  
3112 TA02  
3112fd  
1
For more information www.linear.com/LTC3112  
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