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LTC1142_00 Datasheet(数据表) 1 Page - Linear Technology

部件型号  LTC1142
说明  Dual High Efficiency Synchronous Step-Down Switching Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
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LTC1142 Datasheet(HTML) 1 Page - Linear Technology

 
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1
LTC1142/LTC1142L/LTC1142HV
Dual High Efficiency
Synchronous Step-Down
Switching Regulators
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
®1142/LTC1142L/LTC1142HV are dual synchro-
nous step-down switching regulator controllers featuring
automatic Burst Mode
TM 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.
The operating current level for both regulators is user pro-
grammable via an external current sense resistor. Wide input
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.
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.
s
Dual Outputs: 3.3V and 5V or User Programmable
s
Ultrahigh Efficiency: Over 95% Possible
s
Current Mode Operation for Excellent Line and Load
Transient Response
s
High Efficiency Maintained over 3 Decades of
Output Current
s
Low Standby Current at Light Loads: 160
µA/Output
s
Independent Micropower Shutdown: IQ < 40µA
s
Wide VIN Range: 3.5V to 20V
s
Very Low Dropout Operation: 100% Duty Cycle
s
Synchronous FET Switching for High Efficiency
s
Available in Standard 28-Pin SSOP
s
Notebook and Palmtop Computers
s
Battery-Operated Digital Devices
s
Portable Instruments
s
DC Power Distribution Systems
Figure 1. High Efficiency Dual 3.3V, 5V Supply
1000pF
+
+
+
1000pF
PDRIVE 3
SENSE+ 3
SENSE3
NDRIVE 3
PGND3 SGND3 CT3
ITH3
ITH5
CT5
SGND5 PGND5
NDRIVE 5
SENSE5
SENSE+ 5
PDRIVE 5
VIN3
SHDN3
SHDN5
VIN5
LTC1142HV
CT5
390pF
4
3
25
27
13
11
17
18
RC5
1k
CC3
3300pF
CC5
3300pF
CT3
560pF
RC3
1k
0.22
µF
2
24
16
10
9
15
14
20
23
1
28
6
VOUT5
5V/2A
COUT5
220
µF
10V
× 2
RSENSE5
0.05
P-CH
Si9430DY
L2
50
µH
D2
MBRS130L
N-CH
Si9410DY
0V = NORMAL
>1.5V = SHDN
0.22
µF
CIN5
22
µF
25V
× 2
CIN3
22
µF
25V
× 2
P-CH
Si9430DY
N-CH
Si9410DY
D1
MBRS130L
COUT3
220
µF
10V
× 2
L1
50
µH
RSENSE3
0.05
VOUT3
3.3V/2A
VIN
5.2V TO 18V
RSENSE3, RSENSE5 : DALE WSL-2010-.05
L1, L2: COILTRONICS CTX50-2-MP
PINS 5, 7, 8, 19, 21, 22: NC
1142 F01
NOTE: COMPONENTS OPTIMIZED FOR HIGHEST EFFICIENCY, NOT MINIMUM BOARD SPACE.
+
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
DESCRIPTIO
Burst Mode is a trademark of Linear Technology Corporation.




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