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参数资料
| 型号： | LT1943EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG SW QUAD TFT LCD 28-TSSOP |
| 标准包装： | 2,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 4.5 V ~ 22 V |
| 输出数： | 4 |
| 输出电压： | 1.25 V ~ 40 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
LT1943
PI FU CTIO S
SW3 (Pin 21): This is the collector of the internal NPN
bipolar power transistor for switching regulator 3. Mini-
mize metal trace area at this pin to keep EMI down.
BIAS (Pin 22): The BIAS pin is used to improve efficiency
when operating at higher input voltages. Connecting this
pin to the output of switching regulator 1 forces most of
the internal circuitry to draw its operating current from
V LOGIC rather than V IN . The drivers of switches 2, 3 and 4
are supplied by BIAS. Switches 2, 3 and 4 will not switch
until the BIAS pin reaches approximately 2.8V. BIAS must
be tied to V LOGIC .
PGOOD (Pin 23): Power Good Comparator Output. This is
the open collector output of the power good comparator
and can be used in conjunction with an external P-Channel
MOSFET to provide output disconnect for AV DD as shown
in the 5V Input, Quad Output TFT-LCD Power Supply on
the last page of the data sheet. When switcher 2’s output
reaches approximately 90% of its programmed voltage,
PGOOD will be pulled to ground. This will pull down on the
gate of the MOSFET, connecting AV DD . A 100k pull-up
resistor between the source and gate of the P-channel
MOSFET keeps it off when switcher 2’s output is low.
E3 (Pin 24): This is switching regulator 3’s output and the
emitter of the output disconnect PNP. Tie the output
capacitor and resistor divider here.
C T (Pin 25): Timing Capacitor Pin. This is the input to the
V ON timer and programs the time delay from all four
feedback pins reaching 1.125V to V ON turning on. The C T
capacitor value can be set using the equation C = (20 μ A ?
t DELAY )/1.1V.
V ON (Pin 26): This is the delayed output for switching
regulator 3. V ON reaches its programmed voltage after the
internal C T timer times out. Protection circuitry ensures
V ON is disabled if any of the four outputs are more than
10% below normal voltage.
SW2 (Pins 27, 28): The SW2 pins are the collector of the
internal NPN bipolar power transistor for switching regu-
lator 2. These pins must be tied together. Minimize trace
area at these pins to keep EMI down.
1943fa
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相关代理商/技术参数 |
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| LT1944 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver |
| LT1944-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Micropower Step-Up DC/DC Converter |
| LT1944-1EMS | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT1944-1EMS#PBF | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1944-1EMS#TR | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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