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參數(shù)資料
| 型號： | LTC1435AIG#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| 中文描述： | 2 A SWITCHING CONTROLLER, 138 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 355K |
| 代理商： | LTC1435AIG#PBF |
6
LTC1435A
FUNCTIONAL DIAGRA
UU
W
–
+
–
+
–
+
–
SWITCH
LOGIC
DROP
OUT
DET
0.6V
1.19V
Q
S
R
I1
INTVCC
4k
–
+
8k
180k
30k
+
–
+
EA
SHUTDOWN
6V
3
A
1.19V
1.28V
–
+
4.8V
VIN
SHUTDOWN
1.19V
REF
CSS
CC
RC
RUN/SS
2
ITH
3
DFB*
SENSE+
7
8
SENSE–
EXTVCC
9
+
R2
VOSENSE
OV
1
A
OSC
PGND
10
BG
INTVCC
12
SW
14
TG
16
BOOST
SGND
VIN
13
SFB
4
COSC
1
RSENSE
+
VSEC
CSEC
VOUT
COUT
D1
CB
DB
INTVCC
+
CIN
VIN
COSC
5V
LDO
REG
RUN
SOFT
START
1435A FD
VFB
R1
I2
gm = 1m
* FOLDBACK CURRENT LIMITING OPTION
5
6
11
15
(Refer to Functional Diagram)
OPERATION
U
Main Control Loop
The LTC1435A uses a constant frequency, current mode
step-down architecture. During normal operation, the top
MOSFET is turned on each cycle when the oscillator sets
the RS latch, and turned off when the main current com-
parator I1 resets the RS latch. The peak inductor current at
which I1 resets the RS latch is controlled by the voltage on
the ITH pin , which is the output of error amplifier EA. The
VOSENSEpin, described in the Pin Functions section, allows
EA to receive an output feedback voltage VFB from an ex-
ternal resistive divider. When the load current increases,
it causes a slight decrease in VFB relative to the 1.19V ref-
erence, which in turn causes the ITHvoltagetoincreaseuntil
the average inductor current matches the new load current.
While the top MOSFET is off, the bottom MOSFET is turned
on until either the inductor current starts to reverse, as
indicated by current comparator I2, or the beginning of the
next cycle.
The top MOSFET driver is biased from floating bootstrap
capacitor CB, which normally is recharged during each off
cycle. However, when VIN decreases to a voltage close to
VOUT, the loop may enter dropout and attempt to turn on
the top MOSFET continuously. The dropout detector counts
the number of oscillator cycles that the top MOSFET remains
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| LTC1435AIS#PBF | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| LTC1435CG#PBF | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| LTC1435CS#PBF | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| LTC1435IS#PBF | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| LTC1435IS#TRPBF | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
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| LTC1435AIS | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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 |
| LTC1435AIS#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC1435AIS#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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 |
| LTC1435AIS#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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 |
| LTC1435CG | 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: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) |
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