- 您现在的位置：买卖IC网 > PDF目录15263 > LTC1628CUH#TR (Linear Technology)IC REG CTRLR BUCK PWM CM 32-QFN PDF资料下载
参数资料
| 型号： | LTC1628CUH#TR |
| 厂商： | Linear Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 32-QFN |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 360kHz |
| 占空比： | 99.4% |
| 电源电压： | 3.5 V ~ 30 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 ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1628CUHTR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
LTC1628/LTC1628-PG
APPLICATIO S I FOR ATIO
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 cur-
rent is required through the EXTV CC switch than is speci-
fied, 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 .
Significant efficiency 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)/(Efficiency). 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 efficiency 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
efficiency.
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 Net-
work. For 3.3V and other low voltage regulators, efficiency
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.
Topside MOSFET Driver Supply (C B , D B )
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
external diode D B from INTV CC when the SW pin is low.
When one of the topside MOSFETs is to be turned 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 IN + V INTVCC . The value of the boost capacitor C B needs
to be 100 times that of the total input capacitance of the
topside MOSFET(s). The reverse breakdown of the exter-
nal Schottky diode must be greater than V IN(MAX) . When
adjusting the gate drive level, the final arbiter is the total
input current for the regulator. If a change is made and the
input current decreases, then the efficiency has improved.
If there is no change in input current, then there is no
change in efficiency.
OPTIONAL EXTV CC
V IN
V IN
+
1 μ F
CONNECTION
5V < V SEC < 7V
+
C IN
C IN
+
V IN
V SEC
V IN
BAT85
0.22 μ F
BAT85
LTC1628
TG1
N-CH
+
1 μ F
LTC1628
TG1
N-CH
VN2222LL
BAT85
R SENSE
V OUT
R SENSE
V OUT
R6
EXTV CC
SW
T1
1:N
+
EXTV CC
SW
L1
+
R5
FCB
SGND
BG1
PGND
N-CH
C OUT
BG1
PGND
N-CH
C OUT
1628 F06a
Figure 6a. Secondary Output Loop & EXTV CC Connection
1628 F06b
Figure 6b. Capacitive Charge Pump for EXTV CC
1628fb
18
相关PDF资料 |
PDF描述 |
|---|---|
| H2BXG-10108-V8-ND | JUMPER-H1501TR/A3048V/X 8" |
| LTC3723EGN-1#TRPBF | IC REG CTRLR FLYBK ISO CM 16SSOP |
| LTC3723EGN-1#TR | IC REG CTRLR FLYBK ISO CM 16SSOP |
| LTC3723EGN-2#TRPBF | IC REG CTRLR FLYBK ISO VM 16SSOP |
| H2BXG-10108-S8-ND | JUMPER-H1501TR/A3048S/X 8" |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1628IG | 功能描述:IC REG CTRLR BUCK PWM CM 28-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 |
| LTC1628IG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LTC1628IG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 28-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 |
| LTC1628IG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-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: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 |
| LTC1628IGPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Dual Step-Dn 36V SSOP28 |
发布紧急采购，3分钟左右您将得到回复。