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参数资料
| 型号： | LT1950EGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 560kHz |
| 占空比： | 97% |
| 电源电压： | 3 V ~ 25 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： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LT1950
APPLICATIO S I FOR ATIO
LT1950 Input Supplies, V REF Output and GATE Enable
V IN is the main input supply for the LT1950. V IN2 is the
input supply for the LT1950 output driver. V IN2 can be
provided by shorting the V IN2 pin to the V IN pin or by
generating V IN2 using the BOOST pin. Waveforms of V IN ,
V IN2 , V REF and GATE switching are shown in Figures 2 and
3. Figure 2 represents low V IN operation with V IN2 gener-
ated using the B00ST pin. Figure 3 represents V IN = V IN2
operation with the BOOST pin open circuit or shorted to
V IN = V IN2 Operation
If low V IN operation is not required below approximately
8V on V IN the LT1950 can be configured to run without the
use of the BOOST pin by shorting the V IN2 pin to the V IN
pin. Figure 3 shows that both V IN and V IN2 must now
exceed 6.8V to activate the 2.5V V REF output and must
exceed approximately 8V to enable the output driver
(GATE pin).
ground.
12
8
V IN2
Low V IN Operation
4
GATE
MIN
3V
The LT1950 can be configured to provide a minimum of
10V GATE drive for an external N-channel MOSFET from
0
V IN
L1
D1
V IN voltages as low as 3V, if the BOOST pin is used to
generate a second supply at the V IN2 pin (see Figure 2 and
Applications Information “ Generating V IN2 Supply Using
BOOST Pin”). The advantage of this configuration is that a
lower R DS(ON) is achieved for the external N-channel
MOSFET, improving efficiency, versus a controller run-
4
3
2
1
0
50 μ s/DIV
V IN
V REF
BOOST
LT1950
V IN2
C1
1950 F02
ning at 3V input without boosted gate drive. In addition,
typical controllers running at low input voltages have the
limitation of only being able to use logic level MOSFETs.
Figure 2. Low V IN Operation
The LT1950 allows a greater range of usable MOSFETs.
This versatility allows optimization of the overall power
supply performance and allows applications which would
otherwise not be possible without a more complex topol-
ogy. Figure 2 shows that for V IN above 2V, the internal
10.2
8.5
6.8
5.1
3.4
5.0
V IN = V IN2
V REF
TYPICAL START-UP INPUT
>8.2V
V IN
switcher at the BOOST pin is enabled. This switch gener-
2.5
BOOST
*
ates the V IN2 supply. As V IN2 ramps up above the
undervoltage lockout threshold of 6.8V the 2.5V reference
V REF becomes active and powers up internal control
circuitry. When V IN2 exceeds approximately 8V, the gate
driver is enabled. V IN2 is regulated between 10V and 11V,
providing a supply to the LT1950 output driver to ensure
0
10
5
0
GATE
10 μ s/DIV
LT1950
V IN2
C1
*BOOST PIN CAN BE
LEFT OPEN OR
SHORTED TO GROUND
1950 F03
a minimum of 10V drive at the GATE pin.
Figure 3. V IN = V IN2 Operation
1950fa
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1950IGN | 功能描述:IC REG CTRLR PWM CM 16-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: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) |
| LT1950IGN#PBF | 功能描述:IC REG CTRLR PWM CM 16-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) |
| LT1950IGN#TR | 功能描述:IC REG CTRLR PWM CM 16-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: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) |
| LT1950IGN#TRPBF | 功能描述:IC REG CTRLR PWM CM 16-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:2,500 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) |
| LT1952 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
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