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LTC1439IGW#PBF

更新时间： 2024-11-23 13:09:43
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凌特 - Linear 稳压器开关
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LTC1438/LTC1439  
Dual High Efficiency,  
Low Noise, Synchronous  
Step-Down Switching Regulators  
U
FEATURES  
DESCRIPTION  
The LTC®1438/LTC1439 are dual, synchronous step-  
■
■
■
■
■
■
■
Maintains Constant Frequency at Low Output Currents  
down switching regulator controllers which drive external  
N-channel power MOSFETs in a phase-lockable fixed  
frequencyarchitecture.TheAdaptivePowerTM outputstage  
selectively drives two N-channel MOSFETs at frequencies  
up to 400kHz while reducing switching losses to maintain  
high efficiencies at low output currents.  
Dual N-Channel MOSFET Synchronous Drive  
Programmable Fixed Frequency (PLL Lockable)  
Wide VIN Range: 3.5V to 36V Operation  
Ultrahigh Efficiency  
Very Low Dropout Operation: 99% Duty Cycle  
Low Dropout, 0.5A Linear Regulator for VPP  
Generation or Low Noise Audio Supply  
Built-In Power-On Reset Timer  
Programmable Soft Start  
Low-Battery Detector  
Remote Output Voltage Sense  
Foldback Current Limiting (Optional)  
Pin Selectable Output Voltage  
Logic-Controlled Micropower Shutdown: IQ < 30µA  
Output Voltages from 1.19V to 9V  
Available in 28- and 36-Lead SSOP Packages  
An auxiliary 0.5A linear regulator using an external PNP  
pass device provides a low noise, low dropout voltage  
source. A secondary winding feedback control pin (SFB1)  
guarantees regulation regardless of load on the main  
output by forcing continuous operation.  
■
■
■
■
■
■
■
■
■
An additional comparator is available for use as a low  
batterydetector. Apower-onresettimer(POR)isincluded  
which generates a signal delayed by 65536/fCLK (typ  
300ms) after the output is within 5% of the regulated  
output voltage. Internal resistive dividers provide pin  
selectableoutputvoltageswithremotesensecapabilityon  
one of the two outputs.  
U
APPLICATIONS  
■
Notebook and Palmtop Computers, PDAs  
The operating current levels are user-programmable via  
external current sense resistors. Wide input supply range  
allows operation from 3.5V to 30V (36V maximum).  
■
Portable Instruments  
■
Battery-Operated Devices  
DC Power Distribution Systems  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Adaptive Power is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
V
IN  
5.2V TO 28V  
C
IN  
+
+
D
, CMDSH-3  
D , CMDSH-3  
B2  
B1  
4.7µF  
16V  
22µF  
35V  
× 4  
V
V
INTV  
CC  
BOOST 1  
TGL1  
BOOST 2  
TGL2  
PROG1  
IN  
M1  
M4  
L2  
TGS1  
TGS2  
M6*  
M3*  
L1  
10µH  
C
C
, 0.1µF  
B1  
B2  
10µH  
0.1µF  
SW2  
BG2  
SW1  
BG1  
D2  
M5  
D1  
MBR140T3  
LTC1439  
M2  
MBR140T3  
+
SENSE  
SENSE  
2
2
+
1000pF  
SENSE  
1
R
–
SENSE2  
R
0.03Ω  
SENSE1  
0.03Ω  
1000pF  
V
OSENSE2  
–
V
SENSE  
1
V
3.3V  
3.5A  
OUT1  
5V  
3.5A  
OUT2  
I
I
C
C
TH1  
TH2  
C1  
C2  
+
1000pF  
C
1000pF  
OUT1  
RUN/SS1  
C
V
SGND PGND RUN/SS2  
DSC  
PROG2  
220µF  
+
C
OUT  
R
C
C
C
C
R
C
10V  
C1  
10k  
C1A  
SS1  
0.1µF  
OSC  
56pF  
SS2  
0.1µF  
C2  
10k  
C2A  
470pF  
220µF  
220pF  
10V  
1438 F01  
BOLD LINES INDICATE HIGH CURRENT PATHS  
M1, M2, M4, M5: Si4412DY  
M3, M6: IRLML2803  
*NOT REQUIRED FOR LTC1438  
Figure 1. High Efficiency Dual 5V/3V Step-Down Converter  
1
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LTC1439IGW#PBF 替代型号

型号 品牌 替代类型 描述 数据表
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