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参数资料
| 型号： | LTC3707IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 360kHz |
| 占空比： | 99.4% |
| 电源电压： | 4.5 V ~ 28 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： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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LTC3707
APPLICATIONS INFORMATION
EXTV CC Connection
The LTC3707 contains an internal P-channel MOSFET
switch connected between the EXTV CC and INTV CC pins.
When the voltage applied to EXTV CC rises above 4.7V,
the internal regulator is turned off and the switch closes,
connecting the EXTV CC pin to the INTV CC pin thereby sup-
plying internal power. The switch remains closed as long
as the voltage applied to EXTV CC remains above 4.5V. This
allows the MOSFET driver and control power to be derived
from the output during normal operation (4.7V < V OUT <
7V) and from the internal regulator when the output is
out of regulation (start-up, short-circuit). If more current
is required through the EXTV CC switch than is speci?ed,
an external Schottky diode can be added between the
EXTV CC and INTV CC pins. Do not apply greater than 7V to
the EXTV CC pin and ensure that EXTV CC < V IN .
Signi?cant ef?ciency gains can be realized by powering
INTV CC from the output, since the V IN current resulting
from the driver and control currents will be scaled by a
factor of (Duty Cycle)/(Ef?ciency). For 5V regulators this
supply means connecting the EXTV CC pin directly to V OUT .
However, for 3.3V and other lower voltage regulators,
additional circuitry is required to derive INTV CC power
from the output.
The following list summarizes the four possible connec-
tions for EXTV CC:
1. EXTV CC Left Open (or Grounded). This will cause INTV CC
to be powered from the internal 5V regulator resulting in an
ef?ciency penalty of up to 10% at high input voltages.
2. EXTV CC Connected directly to V OUT . This is the normal
connection for a 5V regulator and provides the highest
ef?ciency.
3. EXTV CC Connected to an External supply. If an external
supply is available in the 5V to 7V range, it may be used to
power EXTV CC providing it is compatible with the MOSFET
gate drive requirements.
4. EXTV CC Connected to an Output-Derived Boost Network.
For 3.3V and other low voltage regulators, ef?ciency gains
can still be realized by connecting EXTV CC to an output-
derived voltage that has been boosted to greater than 4.7V.
This can be done with either the inductive boost winding
as shown in Figure 6a or the capacitive charge pump
shown in Figure 6b. The charge pump has the advantage
of simple magnetics.
OPTIONAL EXTV CC
V IN
V IN
+
1μF
CONNECTION
5V < V SEC < 7V
+
C IN
C IN
+
V IN
V SEC
V IN
BAT85
0.22μF
BAT85
LTC3707
TG1
N-CH
+
1μF
LTC3707
TG1
N-CH
VN2222LL
BAT85
R6
EXTV CC
FCB
SW
BG1
T1
1:N
R SENSE
+
V OUT
C OUT
EXTV CC
SW
BG1
L1
R SENSE
+
V OUT
C OUT
R5
SGND
PGND
N-CH
PGND
N-CH
3707 F06a
Figure 6a. Secondary Output Loop & EXTV CC Connection
Figure 6b. Capacitive Charge Pump for EXTV CC
3707 F06b
3707fb
18
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相关代理商/技术参数 |
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| LTC3708EUH | 功能描述:IC REG CTRLR BUCK PWM CM 32-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 |
| LTC3708EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-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 |
| LTC3708EUH#TR | 功能描述:IC REG CTRLR BUCK PWM CM 32-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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| LTC3708EUHPBF | 制造商:Linear Technology 功能描述:LTC3708 dual SD tracking PS controller |
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