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LTC3537EUD-TRPBF PDF预览

LTC3537EUD-TRPBF

更新时间: 2024-11-12 05:43:55
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
20页 296K
描述
2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO

LTC3537EUD-TRPBF 数据手册

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LTC3537  
2.2 MHz, 600mA  
Synchronous Step-Up DC/DC  
Converter and 100mA LDO  
FEATURES  
DESCRIPTION  
TheLTC®3537combinesahighefficiency,2.2MHzstep-up  
DC/DC converter with an idependent 100mA low dropout  
regulator(LDO).Thestep-upconverterstartsfromaninput  
voltage as low as 0.68V and contains an internal 0.4Ω  
switch and a 0.6Ω synchronous rectifier that disconnects  
from the output when disabled in shutdown.  
n
High Efficiency Step-Up DC/DC Converter and LDO  
Step-Up  
n
V : 0.68V to 5V, V : 1.5V to 5.25V  
OUT  
2.2MHz Fixed Frequency Operation  
Synchronous Rectifier with Output Disconnect  
Burst Mode Operation (Pin Selectable)  
IN  
OUT  
I
: 100mA at 3.3V, V >0.8V  
IN  
n
n
n
A switching frequency of 2.2MHz minimizes solution  
footprint by allowing the use of tiny, low profile inductors  
and ceramic capacitors. The current mode PWM design  
is internally compensated, reducing external parts count.  
Fixed frequency switching is maintained until a light load  
current is sensed, at which point Burst Mode® operation is  
engaged to maximize efficiency. For low noise operation,  
Burst Mode Operation can be disabled. Anti-ring circuitry  
reduces EMI by damping the inductor in discontinuous  
mode. Additional features include a low shutdown current  
of under 1μA and thermal overload protection.  
Linear LDO Regulator  
n
V : 1.8V to 5.5V, V : 0.6V to 5V  
OUT  
100mV Dropout Voltage at 50mA  
24dB Ripple Rejection at f  
IN  
OUT  
I
: 100mA  
n
n
SW  
Combined  
n
Power Good Indicators  
n
n
n
Low-Battery Comparator  
30μA I  
Q
Low Profile 3mm × 3mm × 0.75mm Package  
The integrated LDO regulator provides a very low noise,  
programmable low dropout supply.  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
APPLICATIONS  
n
Wireless Microphones  
n
Portable Medical instruments  
n
Noise Cancelling/Portable Headsets  
n
RF and Audio Power  
TYPICAL APPLICATION  
Efficiency and Power Loss  
vs Load Current  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
2.2μH  
R6  
V
SW  
LTC3537  
OUTB  
V
INB  
V
OUTB  
665k  
3.3V  
EFFICIENCY  
R2  
LBI  
LBO  
V
ALKALINE  
0.8V  
INL  
+
1.74M  
4.7μF  
R5  
1.0M  
TO  
FBB  
PGDB  
PGDL  
ENLDO  
ENBST  
MODE  
1.6V  
V
3V  
OLDO  
V
OLDO  
1μF  
1
POWER LOSS  
R4  
OFF ON  
PWM BURST  
2.05M  
1μF  
FBL  
0.1  
R1  
1M  
R3  
511k  
SGND PGND  
V
IN  
, MODE = 1.8V  
0.01  
0.01  
0.1  
1
10  
100  
1000  
3537 TA01a  
LOAD CURRENT (mA)  
3537 TA01b  
3537fa  
1

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