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參數(shù)資料
| 型號(hào)： | LTC1435 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Efficiency Low Noise Synchronous Step-Down Switching Regulator(高效率，低噪聲，同步步降開關(guān)穩(wěn)壓器) |
| 中文描述： | 高效率低噪聲同步降壓型開關(guān)穩(wěn)壓器（高效率，低噪聲，同步步降開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 338K |
| 代理商： | LTC1435 |
1
LTC1435
High Efficiency Low Noise
Synchronous Step-Down
Switching Regulator
DESCRIPTIO
N
U
The LTC
1435 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using a fixed frequency architecture. Burst
Mode
TM
operation provides high efficiency at low load
currents. A maximum duty cycle limit of 99% provides low
dropout operation which extends operating time in bat-
tery-operated systems.
The operating frequency is set by an external capacitor
allowing maximum flexibility in optimizing efficiency. A
secondary winding feedback control pin, SFB, guarantees
regulation regardless of load on the main output by
forcing continuous operation. Burst Mode operation is
inhibited when the SFB pin is pulled low which reduces
noise and RF interference.
Soft start is provided by an external capacitor which can
be used to properly sequence supplies. The operating
current level is user-programmable via an external current
sense resistor. Wide input supply range allows operation
from 3.5V to 30V (36V maximum).
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Figure 1. High Efficiency Step-Down Converter
FEATURES
I
Dual N-Channel MOSFET Synchronous Drive
I
Programmable Fixed Frequency
I
Wide V
IN
Range: 3.5V to 36V Operation
I
Ultrahigh Efficiency
I
Very Low Dropout Operation: 99% Duty Cycle
I
Low Standby Current
I
Secondary Feedback Control
I
Programmable Soft Start
I
Remote Output Voltage Sense
I
Logic Controlled Micropower Shutdown: I
Q
< 25
μ
A
I
Foldback Current Limiting (Optional)
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Output Voltages from 1.19V to 9V
I
Available in 16-Lead Narrow SO and SSOP Packages
APPLICATIO
S
U
I
Notebook and Palmtop Computers, PDAs
I
Cellular Telephones and Wireless Modems
I
Portable Instruments
I
Battery-Operated Devices
I
DC Power Distribution Systems
TYPICAL APPLICATIO
N
U
I
TH
TG
C
68pF
C
330pF
R
C
10k
100pF
C
SS
0.1
μ
F
SENSE
–
SENSE
+
LTC1435
1000pF
+
4.7
μ
F
D
CMDSH-3
C
B
0.1
μ
F
M2
Si4412DY
D1
MBRS140T3
L1
10
μ
H
M1
Si4412DY
R
SENSE
0.033
+
C
IN
22
μ
F
35V
×
2
V
4.5V TO 28V
+
C
OUT
100
μ
F
10V
×
2
R1
32.4k
R2
22.1k
V
2.9V/3.5A
PGND
BG
C
OSC
V
IN
V
OSENSE
BOOST
1435 F01
SGND
RUN/SS
SW
INTV
CC
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| LTC1435ACG | 功能描述:IC REG CTRLR BUCK PWM CM 16-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 |
| LTC1435ACG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-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:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 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:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC1435ACG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-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 |
| LTC1435ACG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-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:4,500 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 |
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