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LTC1628I-PG

更新时间： 2024-10-30 22:11:19
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
32页 362K
描述
High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

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LTC1628I-PG 数据手册

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LTC1628/LTC1628-PG  
High Efficiency, 2-Phase  
Synchronous Step-Down Switching Regulators  
U
FEATURES  
DESCRIPTIO  
The LTC®1628/LTC1628-PG are high performance dual  
step-down switching regulator controllers that drive all  
N-channel synchronous power MOSFET stages. A con-  
stant frequency current mode architecture allows adjust-  
mentofthefrequencyupto300kHz. Powerlossandnoise  
due to the ESR of the input capacitors are minimized by  
operating the two controller output stages out of phase.  
■
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
OPTI-LOOPTM Compensation Minimizes COUT  
Dual N-Channel MOSFET Synchronous Drive  
±1% Output Voltage Accuracy  
Power Good Output Voltage Monitor (LTC1628-PG)  
DC Programmed Fixed Frequency 150kHz to 300kHz  
Wide VIN Range: 3.5V to 36V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
OPTI-LOOP compensation allows the transient response  
tobeoptimizedoverawiderangeofoutputcapacitanceand  
ESRvalues. Theprecision0.8Vreferenceandpowergood  
output indicator are compatible with future microproces-  
sor generations, and a wide 3.5V to 30V (36V maximum)  
input supply range encompasses all battery chemistries.  
Latched Short-Circuit Shutdown with Defeat Option  
Output Overvoltage Protection  
Remote Output Voltage Sense  
A RUN/SS pin for each controller provides both soft-start  
and optional timed, short-circuit shutdown. Current  
foldback limits MOSFET dissipation during short-circuit  
conditions when overcurrent latchoff is disabled. Output  
overvoltage protection circuitry latches on the bottom  
MOSFET until VOUT returns to normal. The FCB mode pin  
can select among Burst Mode, constant frequency mode  
and continuous inductor current mode or regulate a  
secondary winding. The LTC1628-PG includes a power  
good output pin that replaces the FLTCPL, fault coupling  
control pin of the LTC1628.  
Low Shutdown IQ: 20µA  
5V and 3.3V Standby Regulators  
Small 28-Lead SSOP Package  
Selectable Constant Frequency or Burst ModeTM  
Operation  
U
APPLICATIO S  
■
Notebook and Palmtop Computers, PDAs  
■
Battery Chargers  
■
Portable Instruments  
■
Battery-Operated Digital Devices  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.  
■
DC Power Distribution Systems  
U
V
IN  
5.2V TO 28V  
TYPICAL APPLICATIO  
C
IN  
+
1µF  
22µF  
4.7µF  
D3  
CERAMIC  
50V  
D4  
V
INTV  
IN  
CC  
CERAMIC  
M1  
M3  
M4  
TG1  
TG2  
L1  
6.3µH  
L2  
6.3µH  
C
, 0.1µF  
C
, 0.1µF  
B2  
B1  
BOOST1  
SW1  
BOOST2  
SW2  
LTC1628  
M2  
BG1  
BG2  
D1  
D2  
SGND  
SENSE1  
PGND  
+
+
SENSE2  
R
R
SENSE2  
0.01Ω  
SENSE1  
1000pF  
1000pF  
0.01Ω  
–
–
SENSE1  
SENSE2  
V
V
3.3V  
5A  
OUT1  
5V  
5A  
OUT2  
V
V
OSENSE2  
OSENSE1  
R2  
105k  
1%  
R4  
63.4k  
1%  
I
I
TH1  
TH2  
C
C
C2  
C
C1  
220pF  
C
56µF  
6V  
OUT1  
OUT  
RUN/SS1  
RUN/SS2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
220pF  
R
C2  
47µF  
6V  
R
C1  
C
C
SS1  
0.1µF  
SS2  
0.1µF  
15k  
15k  
SP  
SP  
M1, M2, M3, M4: FDS6680A  
1628 F01  
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter  
1
1234567...32

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