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LTC1142HVCG-ADJ Datasheet

  • LTC1142HVCG-ADJ

  • Dual High Efficiency Synchronous Step-Down Switching Regulat...

  • 404.27KB

  • 20頁

  • LINER

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LTC1142/LTC1142L/LTC1142HV
Dual High Efficiency
Synchronous Step-Down
Switching Regulators
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Dual Outputs: 3.3V and 5V or User Programmable
Ultra-High 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: 160碌A(chǔ)/Output
Independent Micropower Shutdown: I
Q
< 40碌A(chǔ)
Wide V
IN
Range: 3.5V to 20V
Very Low Dropout Operation: 100% Duty Cycle
Synchronous FET Switching for High Efficiency
Available in Standard 28-Pin SSOP
The LTC
廬
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
*For LTC1142L-ADJ only.
APPLICATI
s
s
s
s
S
Notebook and Palmtop Computers
Battery-Operated Digital Devices
Portable Instruments
DC Power Distribution Systems
TYPICAL APPLICATI
+
C
IN3
22碌F
25V
脳
2
V
IN
5.2V TO 18V
0.22碌F
P-CH
Si9430DY
23
1
1000pF
28
SENSE
鈥?/div>
3
NDRIVE 3
24
V
IN3
PDRIVE 3
SENSE
+
3
0V = NORMAL
>1.5V = SHUTDOWN
2
SHUTDOWN 3
16
SHUTDOWN 5
10
V
IN5
PDRIVE 5
SENSE
LTC1142HV
SENSE
鈥?/div>
5
NDRIVE 5
I
TH3
27
R
C3
1k
I
TH5
13
R
C5
1k
C
T5
11
SGND5 PGND5
17
18
14
20
9
0.22碌F
P-CH
Si9430DY
L2
50碌H
V
OUT3
3.3V/2A
R
SENSE3
0.05鈩?/div>
L1
50碌H
+
5 15
D1
1N5818
6
N-CH
Si9410DY
+
C
OUT3
220碌F
10V
脳
2
PGND3 SGND3 C
T3
4
3
25
R
SENSE3,
R
SENSE5
: SL-C1-1/2-1R050J
L1, L2: COILTRONICS CTX50-2-MP
PINS 5, 7, 8, 19, 21, 22: NC
C
C3
C
T3
C
T5
C
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
U
+
C
IN5
22碌F
25V
脳
2
R
SENSE5
0.05鈩?/div>
V
OUT5
5V/2A
1000pF
D2
1N5818
N-CH
Si9410DY
UO
UO
+
C
OUT5
220碌F
10V
脳
2
1

LTC1142HVCG-ADJ 產(chǎn)品屬性

  • LTC1142/L/HV

  • 47

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 2

  • 250kHz

  • 100%

  • 3.5 V ~ 18 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 0°C ~ 70°C

  • 28-SSOP（0.209"，5.30mm 寬）

  • 管件

LTC1142HVCG-ADJ相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
    下載
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    Dual Micropower Comparator
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    DUAL MICROPOWER COMPARATOR
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    Dual Micropower Comparator
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    BANG-BANG Controller
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    BANG-BANG Controller
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    Window Comparator
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    Window Comparator
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    Window Comparator
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    2-Channel Differential Input 16-Bit No Latency DS ADC
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    2-Channel Differential Input 24-Bit No Latency DS ADC
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    2-Channel Differential Input 16-Bit No Latency DS ADC
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    Dual Precision Intrumentation Switched-Capacitor Building Bl...
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  • 英文版
    Switched Capacitor Voltage Converter
    LINER
  • 英文版
    Switched Capacitor Voltage Converter
    LINER [Lin...
  • 英文版
    Programmable Micropower Hex Translator/ Receiver/Driver
    LINER
  • 英文版
    Programmable Micropower Hex Translator/ Receiver/Driver
    LINER [Lin...
  • 英文版
    “Inductorless” 5V to + 5V Converter
    LINER
  • 英文版
    “Inductorless” 5V to + 5V Converter
    LINER [Lin...
  • 英文版
    Dual Micropower Chopper Stabilized Operational Amplifier wit...
    LINER
  • 英文版
    Dual Micropower Zero-Drift Operational Amplifier with Intern...
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