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| 型号： | LTC3732CG |
| 厂商： | Linear Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 36-SSOP |
| 标准包装： | 37 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 750kHz |
| 占空比： | 98.5% |
| 电源电压： | 4.5 V ~ 7 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： | 0°C ~ 70°C |
| 封装/外壳： | 36-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
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LTC3732
APPLICATIO S I FOR ATIO
bypassing close to the IC is necessary to supply the high
transient currents required by the MOSFET gate drivers
while keeping the 5V supply quiet enough so as not to
disturb the very small-signal high bandwidth of the current
comparators.
Each VID digital input is pulled up to a logical high with an
internal 3 μ A. The input logic threshold is approximately
1.2V but the input circuit can withstand an input voltage of
up to 7V.
Table 1. VID Output Voltage Programming
Topside MOSFET Driver Supply (C B , D B )
B4
CODE
B3 B2 B1 B0
V OUT
B4
CODE
B3 B2 B1 B0
V OUT
External bootstrap capacitors, C B , connected to the BOOST
pins, supply the gate drive voltages for the topside
MOSFETs. Capacitor C B in the Functional Diagram is
charged though diode D B from V CC when the SW pin is
low. When one of the topside MOSFETs turns 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 follows. With the topside MOSFET
on, the boost voltage is above the input supply (V BOOST =
V CC + V IN ). The value of the boost capacitor C B needs to be
30 to 100 times that of the total input capacitance of the
topside MOSFET(s). The reverse breakdown of D B must be
greater than V IN(MAX).
Differential Amplifier
The IC has a true remote voltage sense capability. The
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1.450V
1.425V
1.400V
1.375V
1.350V
1.325V
1.300V
1.275V
1.250V
1.225V
1.200V
1.175V
1.150V
1.125V
1.100V
1.075V
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1.850V
1.825V
1.800V
1.775V
1.750V
1.725V
1.700V
1.675V
1.650V
1.625V
1.600V
1.575V
1.550V
1.525V
1.500V
1.475V
sensing connections should be returned from the load,
back to the differential amplifier’s inputs through a com-
mon, tightly coupled pair of PC traces. The differential
amplifier rejects common mode signals capacitively or
inductively radiated into the feedback PC traces as well as
ground loop disturbances. The differential amplifier out-
put signal is divided down through the VID DAC and is
compared with the internal, precision 0.6V voltage refer-
ence by the error amplifier.
The differential amplifier has a 0 to V CC common mode
input range and an output swing range of 0 to V CC – 1.2V.
The output uses an NPN emitter follower without any
internal pull-down current. A DC resistive load to ground
is required in order to sink current.
Output Voltage
The IC includes a digitally controlled 5-bit attenuator
producing output voltages as defined in Table 1. Output
voltages with 25mV increments are produced from 1.075V
to 1.850V.
Soft-Start/Run Function
The RUN/SS pin provides three functions: 1) ON/OFF, 2)
soft-start and 3) a defeatable short-circuit latch off timer.
Soft-start reduces the input power sources’ surge cur-
rents by gradually increasing the controller’s current limit
(proportional to an internal buffered and clamped V ITH ).
The latchoff timer prevents very short, extreme load
transients from tripping the overcurrent latch. A small
pull-up current (>5 μ A) supplied to the RUN/SS pin will
prevent the overcurrent latch from operating. A maximum
pullup current of 200 μ A is allowed into the RUN/SS pin
even though the voltage at the pin may exceed the absolute
maximum rating for the pin. This is because the current is
limited and an internal protection circuit is provided. The
following explanation describes how this function oper-
ates.
An internal 1.5 μ A current source charges up the C SS
capacitor. When the voltage on RUN/SS reaches 1.5V, the
3732f
17
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| LTC3732CG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LTC3732CG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-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 |
| LTC3732CG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-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 |
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