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LTC1142_15

更新时间： 2024-10-01 01:14:59
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凌特 - Linear /
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20页 258K
描述
Dual High Efficiency Synchronous Step-Down Switching Regulators

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LTC1142_15 数据手册

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LTC1142/LTC1142L/LTC1142HV  
Dual High Efficiency  
Synchronous Step-Down  
Switching Regulators  
U
DESCRIPTIO  
FEATURES  
The LTC®1142/LTC1142L/LTC1142HV are dual synchro-  
nous step-down switching regulator controllers featuring  
automatic Burst ModeTM operation to maintain high efficien-  
cies at low output currents. The devices are composed of two  
separate regulator blocks, each driving a pair of external  
complementary power MOSFETs, at switching frequencies  
up to 250kHz, using a constant off-time current mode archi-  
tecture providing constant ripple current in the inductor.  
■
Dual Outputs: 3.3V and 5V or User Programmable  
■
Ultrahigh Efficiency: Over 95% Possible  
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
■
High Efficiency Maintained over 3 Decades of  
Output Current  
■
Low Standby Current at Light Loads: 160µA/Output  
■
Independent Micropower Shutdown: IQ < 40µA  
■
Wide VIN Range: 3.5V to 20V  
The operating current level for both regulators is user pro-  
grammableviaanexternalcurrentsenseresistor. Wideinput  
supply range allows operation from 3.5V* to 18V (20V  
maximum).Constantoff-timearchitectureprovideslowdrop-  
out regulation limited only by the RDS(ON) of the external  
MOSFET and resistance of the inductor and current sense  
resistor.  
■
Very Low Dropout Operation: 100% Duty Cycle  
■
Synchronous FET Switching for High Efficiency  
■
Available in Standard 28-Pin SSOP  
U
APPLICATIO S  
■
Notebook and Palmtop Computers  
The LTC1142 series is ideal for applications requiring dual  
output voltages with high conversion efficiencies over a wide  
load current range in a small amount of board space.  
■
Battery-Operated Digital Devices  
■
Portable Instruments  
DC Power Distribution Systems  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
IN  
5.2V TO 18V  
C
IN5  
C
+
+
IN3  
22µF  
25V  
× 2  
22µF  
25V  
× 2  
0.22µF  
0.22µF  
0V = NORMAL  
>1.5V = SHDN  
2
24  
16  
10  
P-CH  
P-CH  
Si9430DY  
Si9430DY  
V
SHDN3  
V
IN5  
SHDN5  
IN3  
23  
1
9
L2  
L1  
50µH  
R
R
SENSE5  
0.05Ω  
SENSE3  
PDRIVE 3  
PDRIVE 5  
50µH  
V
0.05Ω  
OUT3  
3.3V/2A  
V
OUT5  
5V/2A  
15  
+
+
SENSE  
SENSE  
3
SENSE  
SENSE  
5
5
LTC1142HV  
1000pF  
1000pF  
–
–
3
14  
20  
28  
6
D1  
MBRS130L  
D2  
NDRIVE 3  
NDRIVE 5  
MBRS130L  
N-CH  
Si9410DY  
N-CH  
Si9410DY  
C
PGND3 SGND3  
C
I
I
SGND5  
17  
PGND5  
18  
T5  
T3  
TH3  
27  
TH5  
13  
R
C5  
1k  
C
OUT5  
C
+
+
OUT3  
220µF  
4
3
25  
11  
220µF  
10V  
× 2  
10V  
× 2  
R
C3  
1k  
R
R
: DALE WSL-2010-.05  
SENSE3, SENSE5  
L1, L2: COILTRONICS CTX50-2-MP  
PINS 5, 7, 8, 19, 21, 22: NC  
C
C
C
C
T5  
T3  
C3  
C5  
560pF 3300pF 3300pF 390pF  
1142 F01  
NOTE: COMPONENTS OPTIMIZED FOR HIGHEST EFFICIENCY, NOT MINIMUM BOARD SPACE.  
Figure 1. High Efficiency Dual 3.3V, 5V Supply  
1
1234567...20

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