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LTC3836EUFD-TRPBF PDF预览

LTC3836EUFD-TRPBF

更新时间： 2024-09-28 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
28页 445K
描述
Dual 2-Phase, No RSENSETM Low VIN Synchronous Controller

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中文翻译

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LTC3836EUFD-TRPBF 数据手册

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LTC3836  
Dual 2-Phase,  
No R  
TM Low V  
SENSE  
IN  
Synchronous Controller  
FEATURES  
DESCRIPTION  
The LTC®3836 is a 2-phase dual output synchronous  
step-down switching regulator controller with tracking  
that drives external N-channel power MOSFETs using few  
external components. The constant-frequency current  
n
No Current Sense Resistors Required  
n
Out-of-Phase Controllers Reduce Required Input  
Capacitance  
n
All N-Channel Synchronous Drive  
n
V Range: 2.75V to 4.5V  
mode architecture with MOSFET V sensing eliminates  
IN  
DS  
n
Constant-Frequency Current Mode Operation  
the need for sense resistors and improves efficiency.  
The power loss and noise due to the ESR of the input  
capacitance are minimized by operating the two control-  
lersout-of-phase. Pulse-skippingoperationprovideshigh  
efficiency at light loads. The 97% duty cycle capability  
provides low dropout operation, extending operating time  
in battery-powered systems.  
n
0.6V 1.5% Voltage Reference  
n
Low Dropout Operation: 97% Duty Cycle  
n
True PLL for Frequency Locking or Adjustment  
n
Selectable Pulse-Skipping/Continuous Operation  
n
Tracking Function  
Internal Soft-Start Circuitry  
n
n
Power Good Output Voltage Monitor  
The operating frequency is selectable from 300kHz to  
750kHz, allowing the use of small surface mount induc-  
tors and capacitors. For noise sensitive applications, the  
LTC3836 operating frequency can be externally synchro-  
nized from 250kHz to 850kHz.  
n
Output Overvoltage Protection  
n
Micropower Shutdown: I = 6.5μA  
Q
n
Tiny Low Profile (4mm × 5mm) QFN and Narrow  
SSOP Packages  
The LTC3836 features an internal 1ms soft-start that can  
be extended with an external capacitor. A tracking input al-  
lows the second output to track the first during start-up.  
APPLICATIONS  
n
General Purpose 3.3V to 1.X Supplies  
n
Single Lithium-Ion Powered Devices  
Distributed DC Power Systems  
The LTC3836 is available in the tiny thermally enhanced  
(4mm × 5mm) QFN and 28-lead narrow SSOP packages.  
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No R  
SENSE  
is a trademark of Linear Technology Corporation. All other trademarks are the property of their  
respective owners. Protected by U.S. Patents including 5481178, 5929620, 6144194, 6304066,  
6498466, 6580258, 6611131.  
TYPICAL APPLICATION  
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter  
Efficiency/Power Loss vs Load Current  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10000  
V
IN  
3.3V  
3.3V-1.8V  
EFFICIENCY  
22μF  
× 3  
V
IN  
BOOST1 BOOST2  
3.3V-1.2V  
EFFICIENCY  
+
+
SENSE1 SENSE2  
1000  
100  
10  
TG1  
TG2  
0.47μH  
0.47μH  
SW1  
SW2  
LTC3836  
3.3V-1.2V  
POWER LOSS  
BG1  
BG2  
PGND  
3.3V-1.8V  
POWER LOSS  
59k  
118k  
V
V
OUT2  
OUT1  
V
V
FB1  
FB2  
1.8V AT  
15A  
1.2V AT  
I
I
TH1  
TH2  
15A  
820pF  
15k  
820pF  
15k  
SGND  
CIRCUIT OF FIGURE 15  
1000 10000  
LOAD CURRENT (mA)  
59k  
100μF  
× 2  
100μF  
× 2  
1
59k  
10  
100  
100000  
3836 TA01b  
3836 TA01  
3836fa  
1
1234567...28

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