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参数资料
| 型号： | LTC1435IS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 138kHz |
| 占空比： | 99% |
| 电源电压： | 3.5 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC1435
APPLICATIO N S I N FOR M ATIO N
+
V IN
C IN
V IN
BAT85
0.22 μ F
+
1 μ F
BAT85
V OSENSE
LTC1435
1.19V ≤ V OUT ≤ 9V
R2
100pF
R1
TG
N-CH
VN2222LL
BAT85
SGND
LTC1435 ? F05
EXTV CC
LTC1435
L1
R SENSE
+
V OUT
Figure 5. Setting the LTC1435 Output Voltage
SW
C OUT
BG
N-CH
3.3V OR 5V
D1
RUN/SS
RUN/SS
PGND
LTC1435 ? F04b
Figure 4b. Capacitive Charge Pump for EXTV CC
C SS
C SS
LTC1435 ? F06
Figure 6. RUN/SS Pin Interfacing
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:
Soft start reduces surge currents from V IN by gradually
increasing the internal current limit. Power supply se-
quencing can 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
V OUT = 1 . 19 V ? 1 +
?
?
?
R 2 ?
R 1 ?
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.
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.
12
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).
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