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參數資料
| 型號： | LLTC1142HV |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關穩壓器 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 261K |
| 代理商： | LLTC1142HV |
1
LTC1142/LTC1142L/LTC1142HV
Dual High Efficiency
Synchronous Step-Down
Switching Regulators
DESCRIPTIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark 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). Constant off-time architecture provides low drop-
out regulation limited only by the R
DS(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.
I
Dual Outputs: 3.3V and 5V or User Programmable
I
Ultrahigh Efficiency: Over 95% Possible
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
High Efficiency Maintained over 3 Decades of
Output Current
I
Low Standby Current at Light Loads: 160
μ
A/Output
I
Independent Micropower Shutdown: I
Q
< 40
μ
A
I
Wide V
IN
Range: 3.5V to 20V
I
Very Low Dropout Operation: 100% Duty Cycle
I
Synchronous FET Switching for High Efficiency
I
Available in Standard 28-Pin SSOP
I
Notebook and Palmtop Computers
I
Battery-Operated Digital Devices
I
Portable Instruments
I
DC Power Distribution Systems
Figure 1. High Efficiency Dual 3.3V, 5V Supply
1000pF
+
+
+
1000pF
PDRIVE 3
SENSE
+
3
SENSE
–
3
NDRIVE 3
PGND3 SGND3 C
T3
4
I
TH3
I
TH5
C
T5
SGND5 PGND5
17
NDRIVE 5
SENSE
–
5
SENSE
+
5
PDRIVE 5
V
IN3
SHDN3
SHDN5
V
IN5
LTC1142HV
C
390pF
3
25
27
R
C3
1k
13
R
C5
1k
11
18
C
3300pF
C
3300pF
C
560pF
0.22
μ
F
2
24
16
10
9
15
14
20
23
1
28
6
V
5V/2A
C
OUT5
220
μ
F
10V
×
2
R
0.05
P-CH
Si9430DY
L2
50
μ
H
D2
MBRS130L
N-CH
Si9410DY
0V = NORMAL
>1.5V = SHDN
0.22
μ
F
C
IN5
22
μ
F
25V
×
2
C
IN3
22
μ
F
25V
×
2
P-CH
Si9430DY
N-CH
Si9410DY
D1
MBRS130L
C
OUT3
220
μ
F
10V
×
2
L1
50
μ
H
R
0.05
V
3.3V/2A
V
5.2V TO 18V
R
R
: 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.
+
APPLICATIOU
FEATURES
TYPICAL APPLICATIO
U
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