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| 型号： | LTC3736EGN-1#TR |
| 厂商： | Linear Technology |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-SSOP |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 825kHz |
| 占空比： | 100% |
| 电源电压： | 2.75 V ~ 9.8 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： | 带卷 (TR) |
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LTC3736-1
APPLICATIO S I FOR ATIO
where f is the operating frequency, C OUT is the output
capacitance and I RIPPLE is the ripple current in the induc-
tor. The output ripple is highest at maximum input voltage
since I RIPPLE increases with input voltage.
Setting Output Voltage
The LTC3736-1 output voltages are each set by an external
feedback resistor divider carefully placed across the out-
put, as shown in Figure 6. The regulated output voltage is
determined by:
allows C SS 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 V OUT1 is controlled by
slowly ramping the positive reference to the error amplifier
from 0V to 0.6V, allowing V OUT1 to rise smoothly from 0V
to its final value. The default internal soft-start time is 1ms.
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:
V OUT = 0 . 6 V ? ? 1 + B ?
? R ?
? R A ?
t SS 1 = C SS ?
600mV
0 . 7 μ A
? TRACKA TRACKB
V OUT 1 R 2 A R + R
C SS
To improve the frequency response, a feed-forward ca-
pacitor, C FF , may be used. Great care should be taken to
route the V FB line away from noise sources, such as the
inductor or the SW line. When spread spectrum operation
is enabled, it is recommended that R A and R B be large-
valued, preferably on the order of hundreds of kilohms.
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 LTC3736-1.
Pulling the RUN/SS pin below 0.65V puts the LTC3736-1
into a low quiescent current shutdown mode (I Q = 9 μ A). If
RUN/SS has been pulled all the way to ground, there will
be a delay before the LTC3736-1 comes out of shutdown
and is given by:
t DELAY = 0 . 65 V ? = 0 . 93 s / μ F ? C SS
0 . 7 μ A
This pin can be driven directly from logic as shown in
Figure 6. Diode D1 in Figure 7 reduces the start delay but
V OUT
It is recommended that C SS have a value of at least twice
that of the frequency filtering capacitor connected to the
FREQ pin when spread sprectrum operation is enabled
(see Operation Frequency section).
Tracking
The start-up of V OUT2 is controlled by the voltage on the
TRACK pin. Normally this pin is used to allow the start-up
of V OUT2 to track that of V OUT1 as shown qualitatively in
Figures 8a and 8b. When the voltage on the TRACK pin is
less than the internal 0.6V reference, the LTC3736-1
regulates the V FB2 voltage to the TRACK pin voltage
instead of 0.6V. The start-up of V OUT2 may ratiometrically
track that of V OUT1 , according to a ratio set by a resistor
divider (Figure 8c):
=
V OUT 2 R TRACKA R 2 B + R 2 A
For coincident tracking (V OUT1 = V OUT2 during start-up),
R2A/R2B = R TRACKA /R TRACKB
3.3V OR 5V
RUN/SS
RUN/SS
1/2 LTC3736-1
R B
C FF
D1
V FB
R A
C SS
C SS
37361 F06
Figure 6. Setting Output Voltage
Figure 7. RUN/SS Pin Interfacing
37361 F07
37361f
18
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| LTC3736EGN-2#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® 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-2#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) |
| LTC3736EUF | 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN 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: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 |
| LTC3736EUF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN 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 |
| LTC3736EUF#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN 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: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 |
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