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LTC3728L-1

更新时间： 2024-11-14 01:22:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
32页 480K
描述
Dual, 550kHz, 2-Phase Synchronous Regulator

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LTC3728L-1 数据手册

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LTC3728L-1  
Dual, 550kHz, 2-Phase  
Synchronous Regulator  
FEATURES  
DESCRIPTION  
The LTC®3728L-1 is a dual high performance step-down  
switching regulator controller that drives all N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
currentmodearchitectureallowsphase-lockablefrequency  
of up to 550kHz. Power loss and noise due to the ESR of  
the input capacitors are minimized by operating the two  
controller output stages out of phase. The LTC3728L-1  
is identical to the LTC3728L except that the LTC3728L-1  
lacks the over current latchoff feature.  
n
Dual, 180° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
n
OUT  
n
n
n
n
n
1.5ꢀ Output Voltage Accuracy  
Power Good Output Voltage Indicator  
Phase-Lockable Fixed Frequency 250kHz to 550kHz  
Over Current Latchoff Disabled  
Wide V Range: 4.5V to 28V (35V for LTC3728LI-1)  
IN  
Operation  
n
n
n
n
n
n
n
OPTI-LOOPcompensationallowsthetransientresponseto  
be optimized over a wide range of output capacitance and  
ESR values. The precision 0.8V reference and power good  
output indicator are compatible with future microproces-  
sor generations, and a wide 4.5V to 28V (30V maximum/  
35V for LTC3728LI-1) input supply range encompasses  
all battery chemistries.  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
Output Overvoltage Protection  
Low Shutdown I : 20μA  
Q
5V and 3.3V Standby Regulators  
3 Selectable Operating Modes: Constant Frequency,  
Burst Mode® Operation and PWM  
5mm × 5mm QFN and 28-Lead Narrow SSOP  
Packages  
A RUN/SS pin for each controller provides soft-start.  
Current foldback limits MOSFET dissipation during short-  
circuit conditions. The FCB mode pin can select among  
Burst Mode operation, constant frequency mode and  
continuousinductorcurrentmodeorregulateasecondary  
winding. The LTC3728L-1 includes a power good output  
pin that indicates when both outputs are within 7.5% of  
their designed set point.  
n
APPLICATIONS  
n
Notebook and Palmtop Computers  
Telecom Systems  
Portable Instruments  
Battery-Operated Digital Devices  
DC Power Distribution Systems  
n
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
n
Protected by U.S. Patents including 5929620, 6177787, 6144199, 5471178, 5994885, 6100678.  
TYPICAL APPLICATION  
V
IN  
5.2V TO 28V  
C
22μF  
50V  
1μF  
CERAMIC  
IN  
+
4.7μF  
D3  
D4  
V
PGOOD INTV  
IN  
CC  
M2  
M1  
CERAMIC  
TG1  
TG2  
L1  
3.2μH  
L2  
3.2μH  
BOOST1  
SW1  
BOOST2  
SW2  
C
, 0.1μF  
C
, 0.1μF  
B2  
B1  
LTC3728L-1  
BG1  
BG2  
f
IN  
500kHz  
PLLIN  
PGND  
+
–
+
SENSE1  
SENSE2  
R
R
SENSE2  
0.01Ω  
SENSE1  
1000pF  
1000pF  
0.01Ω  
–
SENSE1  
V
I
SENSE2  
V
V
3.3V  
5A  
OSENSE1  
TH1  
OSENSE2  
I
TH2  
V
OUT2  
OUT1  
5V  
5A  
R2  
105k  
1%  
R4  
63.4k  
1%  
C
C
C2  
C1  
220pF  
C
47μF  
6V  
C
56μF  
6V  
RUN/SS1 SGND RUN/SS2  
OUT1  
OUT  
220pF  
R
C2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
R
C1  
C
C
SS2  
0.1μF  
SS1  
0.1μF  
15k  
15k  
SP  
SP  
M1, M2: FDS6982S  
3728l1 F01  
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter  
3728l1fc  
1
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