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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： | 3/28页 |
| 文件大小： | 344K |
| 代理商： | LTC3736-2EUF#PBF |
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LTC3736-2
11
37362fb
OPERATION
higher than forced continuous mode. During start-up or
a short-circuit condition (VFB1 or VFB2 ≤ 0.54V), the
LTC3736-2 operates in pulse-skipping mode (no current
reversal allowed), regardless of the state of the SYNC/
FCB pin.
Short-Circuit Protection
When an output is shorted to ground (VFB < 0.12V), the
switching frequency of that controller is reduced to one
fth of the normal operating frequency. The other controller
is unaffected and maintains normal operation.
The short-circuit threshold on VFB2 is based on the smaller
of 0.12V and a fraction of the voltage on the TRACK pin.
This also allows VOUT2 to start up and track VOUT1 more
easily. Note that if VOUT1 is truly short-circuited (VOUT1 =
VFB1 = 0V), then the LTC3736-2 will try to regulate VOUT2
to 0V if a resistor divider on VOUT1 is connected to the
TRACK pin.
Output Overvoltage Protection
As a further protection, the overvoltage comparator (OV)
guards against transient overshoots, as well as other more
serious conditions that may overvoltage the output. When
the feedback voltage on the VFB pin has risen 13.33%
above the reference voltage of 0.6V, the external P-chan-
nel MOSFET is turned off and the N-channel MOSFET is
turned on until the overvoltage is cleared.
Frequency Selection and Phase-Locked Loop (PLLLPF
and SYNC/FCB Pins)
The selection of switching frequency is a tradeoff between
efciency and component size. Low frequency opera-
tion increases efciency by reducing MOSFET switching
losses, but requires larger inductance and/or capacitance
to maintain low output ripple voltage.
The switching frequency of the LTC3736-2’s controllers
can be selected using the PLLLPF pin.
If the SYNC/FCB is not being driven by an external
clock source, the PLLLPF can be oated, tied to VIN
or tied to SGND to select 550kHz, 750kHz or 300kHz,
respectively.
A phase-locked loop (PLL) is available on the LTC3736-2
to synchronize the internal oscillator to an external clock
source that is connected to the SYNC/FCB pin. In this
case, a series RC should be connected between the
PLLLPF pin and SGND to serve as the PLL’s loop lter.
The LTC3736-2 phase detector adjusts the voltage on the
PLLLPF pin to align the turn-on of controller 1’s external
P-channel MOSFET to the rising edge of the synchronizing
signal. Thus, the turn-on of controller 2’s external P-chan-
nel MOSFET is 180 degrees out-of-phase with the rising
edge of the external clock source.
The typical capture range of the LTC3736-2’s phase-locked
loop is from approximately 200kHz to 1MHz, and is guaran-
teed over temperature to be between 250kHz and 850kHz.
In other words, the LTC3736-2’s PLL is guaranteed to lock
to an external clock source whose frequency is between
250kHz and 850kHz.
Dropout Operation
When the input supply voltage (VIN) decreases towards
the output voltage, the rate of change of the inductor
current while the external P-channel MOSFET is on (ON
cycle) decreases. This reduction means that the P-channel
MOSFET will remain on for more than one oscillator cycle
if the inductor current has not ramped up to the threshold
set by the EAMP on the ITH pin. Further reduction in the
input supply voltage will eventually cause the P-channel
MOSFET to be turned on 100%, i.e., DC. The output volt-
age will then be determined by the input voltage minus
the voltage drop across the P-channel MOSFET and the
inductor.
Undervoltage Lockout
To prevent operation of the external MOSFETs below safe
input voltage levels, an undervoltage lockout is incorpo-
rated in the LTC3736-2. When the input supply voltage
(VIN) drops below 2.3V, the external P- and N-channel
MOSFETs and all internal circuitry are turned off except
for the undervoltage block, which draws only a few
microamperes.
(Refer to Functional Diagram)
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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) |
| LTC3736EGN-1 | 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: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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