參數(shù)資料
型號： LTC1142L-ADJ
廠商： Linear Technology Corporation
英文描述： OCTAL BUS TRANSCEIVER O.C. 20-SO 0 to 70
中文描述： 雙通道高效率同步降壓型開關(guān)穩(wěn)壓器
文件頁數(shù)： 1/20頁
文件大小： 401K
代理商： LTC1142L-ADJ
1
LTC1142/LTC1142L/LTC1142HV
Dual High Efficiency
Synchronous Step-Down
Switching Regulators
S
FEATURE
D
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.
U
ESCRIPTIO
I
Dual Outputs: 3.3V and 5V or User Programmable
I
Ultra-High 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
U
S
A
O
PPLICATI
Figure 1. High Efficiency Dual 3.3V, 5V
U
A
O
PPLICATI
TYPICAL
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
SHUTDOWN 3
SHUTDOWN 5
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
F
10V
×
2
R
0.05
P-CH
Si9430DY
L2
50
μ
H
D2
1N5818
N-CH
Si9410DY
0V = NORMAL
>1.5V = SHUTDOWN
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
1N5818
C
OUT3
220
F
10V
×
2
L1
50
μ
H
R
0.05
V
3.3V/2A
V
5.2V TO 18V
R
R
: SL-C1-1/2-1R050J
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.
+
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode
is a trademark of Linear Technology Corporation.
*For LTC1142L-ADJ only.
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LTC1143CS Enclosures; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes RoHS Compliant: Yes
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1142LCG-ADJ 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1142LCG-ADJ#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1142LCG-ADJ#TR 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1142LCG-ADJ#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1143 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers
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