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参数资料
| 型号： | LTC3736-2EUF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO24 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-24 |
| 文件页数： | 10/28页 |
| 文件大小： | 344K |
| 代理商： | LTC3736-2EUF#PBF |
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LTC3736-2
18
37362fb
APPLICATIONS INFORMATION
Run/Soft-Start Function
The RUN/SS pin is a dual purpose pin that provides the
optional external soft-start function and a means to shut
down the LTC3736-2.
Pulling the RUN/SS pin below 0.65V puts the LTC3736-2
into a low quiescent current shutdown mode (IQ = 9μA). If
RUN/SS has been pulled all the way to ground, there will
be a delay before the LTC3736-2 comes out of shutdown
and is given by:
tV
C
A
sF C
DELAY
SS
=
μ
=
μ
065
07
093
.
./
This pin can be driven directly from logic as shown in
Figure 6. Diode D1 in Figure 6 reduces the start delay
but allows CSS to ramp up slowly providing the soft-start
function. This diode (and capacitor) can be deleted if the
external soft-start is not needed.
During soft-start, the start-up of VOUT1 is controlled by
slowly ramping the positive reference to the error ampli-
er from 0V to 0.6V, allowing VOUT1 to rise smoothly from
0V to its nal value. The default internal soft-start time
is 1ms.
Figure 5. Setting Output Voltage
1/2 LTC3736-2
VFB
VOUT
RB
CFF
RA
37362 F05
This can be increased by placing a capacitor between the
RUN/SS pin and SGND. In this case, the soft-start time
will be approximately:
tC
mV
A
SS
1
600
07
=
μ
.
Tracking
The start-up of VOUT2 is controlled by the voltage on the
TRACK pin. Normally this pin is used to allow the start-up
of VOUT2 to track that of VOUT1 as shown qualitatively in
Figures 7a and 7b. When the voltage on the TRACK pin
is less than the internal 0.6V reference, the LTC3736-2
regulates the VFB2 voltage to the TRACK pin voltage in-
stead of 0.6V. The start-up of VOUT2 may ratiometrically
track that of VOUT1, according to a ratio set by a resistor
divider (Figure 7c):
V
RA
R
RR
RB R A
OUT
TRACKA
TRACKB
1
2
22
=
+
For coincident tracking (VOUT1 = VOUT2 during start-up),
R2A = RTRACKA
R2B = RTRACKB
The ramp time for VOUT2 to rise from 0V to its nal value
is:
tt
R
RA
RA R B
RR
SS
TRACKA
TRACKB
21
1
11
=
+
Figure 6. RUN/SS Pin Interfacing
Figure 7a. Using the TRACK Pin
3.3V OR 5V
RUN/SS
CSS
(INTERNAL SOFT-START)
D1
37362 F06
VDD ≤ VIN
RUN/SS
LTC3736-2
VFB2
VOUT2
VOUT1
VFB1
TRACK
R2B
R2A
37362 F07a
R1B
R1A
RTRACKA
RTRACKB
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相关代理商/技术参数 |
参数描述 |
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| LTC3736EGN | 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:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#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:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3736EGN#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:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#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:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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