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參數(shù)資料
| 型號： | LTC1435IG |
| 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, 400 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 404K |
| 代理商： | LTC1435IG |
12
LTC1435
APPLICATIO
S I
FOR
ATIO
U
W
U
U
EXTV
CC
V
IN
TG
BG
PGND
LTC1435
N-CH
N-CH
+
C
IN
V
IN
+
C
OUT
L1
R
SENSE
V
OUT
+
1
μ
F
LTC1435 F04b
VN2222LL
BAT85
BAT85
BAT85
0.22
μ
F
SW
Figure 4b. Capacitive Charge Pump for EXTV
CC
Topside MOSFET Driver Supply (C
B
, D
B
)
An external bootstrap capacitor C
B
connected to the Boost
pin supplies the gate drive voltage for the topside MOSFET.
Capacitor C
B
in the Functional Diagram is charged through
diode D
B
from INTV
CC
when the SW pin is low. When the
topside MOSFET is to be turned on, the driver places the
C
B
voltage across the gate source of the MOSFET. This
enhances the MOSFET and turns on the topside switch.
The switch node voltage SW rises to V
IN
and the Boost pin
rises to V
IN
+ INTV
CC
. The value of the boost capacitor C
B
needs to be 100 times greater than the total input capaci-
tance of the topside MOSFET. In most applications 0.1
μ
F
is adequate. The reverse breakdown on D
B
must be greater
than V
IN(MAX).
Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
R
R
1
V
V
OUT
=
+
1 19
.
1
2
The external resistor divider is connected to the output as
shown in Figure 5 allowing remote voltage sensing.
Run/Soft Start Function
The RUN/SS pin is a dual purpose pin which provides the
soft start function and a means to shut down the LTC1435.
Figure 6. RUN/SS Pin Interfacing
LTC1435 F06
C
SS
D1
3.3V OR 5V
RUN/SS
C
SS
RUN/SS
Soft start reduces surge currents from V
IN
by gradually
increasing the internal current limit. Power supply se-
quencingcan also be accomplished using this pin.
An internal 3
μ
A current source charges up an external
capacitor C
SS.
When the voltage on RUN/SS reaches 1.3V
the LTC1435 begins operating. As the voltage on RUN/SS
continues to ramp from 1.3V to 2.4V, the internal current
limit is also ramped at a proportional linear rate. The
current limit begins at approximately 50mV/R
SENSE
(at
V
RUN/SS
= 1.3V) and ends at 150mV/R
SENSE
(V
RUN/SS
>
2.7V). The output current thus ramps up slowly, charging
the output capacitor. If RUN/SS has been pulled all the way
to ground there is a delay before starting of approximately
500ms/
μ
F, followed by an additional 500ms/
μ
F to reach
full current.
t
DELAY
= 5(10
5
)C
SS
Seconds
Pulling the RUN/SS pin below 1.3V puts the LTC1435 into
a low quiescent current shutdown (I
Q
< 25
μ
A). This pin
can be driven directly from logic as shown in Figure 6.
Diode D1 in Figure 6 reduces the start delay but allows
C
SS
to ramp up slowly for the soft start function; this
diode and C
SS
can be deleted if soft start is not needed.
The RUN/SS pin has an internal 6V Zener clamp (See
Functional Diagram).
V
OSENSE
LTC1435
R1
R2
LTC1435 F05
100pF
1.19V
≤
V
OUT
≤
9V
SGND
Figure 5. Setting the LTC1435 Output Voltage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1435IG#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) |
| LTC1435IG#TR | 制造商:Linear Technology 功能描述:DP-SWREG/Controller, See P/N LTC1435IG#TR for Upgrade/ |
| LTC1435IG#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 |
| LTC1435IS | 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 |
| LTC1435IS#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:- 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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