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| 型号： | LTC1436AIGN-PLL |
| 厂商： | Linear Technology |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-SSOP |
| 标准包装： | 55 |
| 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： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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LTC1436A
LTC1436-PLL-A/LTC1437A
APPLICATIO N S I N FOR M ATIO N
LTC1436A OSENSE
LTC1436A V IN
LTC1437A
TGL
C IN
+
V IN
N-CH
BAT85
+
1 μ F
0.22 μ F
VN2222LL
BAT85
BAT85
LTC1437A
V
V PROG
SGND
GND: V OUT = 3.3V
INTV CC : V OUT = 5V
+
C OUT
V OUT
EXTV CC
TGS
SW
N-CH
L1
R SENSE
+
C OUT
1436 F05a
Figure 5a. LTC1436A/LTC1437A Fixed Output Applications
BG
PGND
N-CH
1436 F04b
1.19V ≤ V OUT ≤ 9V
V PROG
OPEN (DC)
R2
Figure 4b. Capacitive Charge Pump for EXT V CC
LTC1436A
V OSENSE
Topside MOSFET Driver Supply (C B , D B )
LTC1437A
SGND
100pF
R1
( )
V OUT = 1.19V 1 +
AnexternalbootstrapcapacitorC B connectedtotheBoost
pin supplies the gate drive voltage for the topside
R2
R1
1436 F05b
MOSFET(s). Capacitor C B in the functional diagram is
charged through diode D B from INTV CC when the SW pin
is low. When one of the topside MOSFET(s) is to be turned
on, the driver places the C B voltage across the gate source
of the desired 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 capacitance of the topside
MOSFET(s). 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 pin selectable for all members of the
LTC1436A/LTC1437A family. The output voltage is
selected by the V PROG pin as follows:
V PROG = 0V V OUT = 3.3V
V PROG = INTV CC V OUT = 5V
V PROG = Open (DC) V OUT = Adjustable
The LTC1436A/LTC1437A family also has remote output
voltage sense capability. The top of an internal resistive
divider is connected to V OSENSE . For fixed 3.3V and 5V
output voltage applications the V OSENSE pin is connected
to the output voltage as shown in Figure 5a. When using
an external resistive divider, the V PROG pin is left open (DC)
and the V OSENSE pin is connected to the feedback resistors
as shown in Figure 5b.
Figure 5b. LTC1436A/LTC1437A Adjustable Applications
Power-On Reset Function (POR)
The power-on reset function monitors the output voltage
and turns on an open drain device when it is out of
regulation. An external pull-up resistor is required on the
POR pin.
When power is first applied or when coming out of
shutdown, the POR output is pulled to ground. When the
output voltage rises above a level which is 5% below the
final regulated output value, an internal counter starts.
After counting 2 16 (65536) clock cycles, the POR pull-
down device turns off.
The POR output will go low whenever the output voltage
drops below 7.5% of its regulated value for longer than
approximately 30 μ s, signaling an out-of-regulation condi-
tion. In shutdown, the POR output is pulled low even if the
regulator’s output is held up by an external source.
Run/Soft Start Function
The RUN/SS pin is a dual purpose pin that provides the
soft start function and a means to shut down the
LTC1436A/LTC1437A. Soft start reduces surge currents
from V IN by gradually increasing the internal current limit.
Power supply sequencing can also be accomplished
using this pin.
14367afb
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1436AIGN-PLL#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1436AIGN-PLL#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1436AIGN-PLL#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1436CGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1436CGN#PBF | 制造商:Linear Technology 功能描述:Step-Down Switching Regulators |
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