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| 型号： | LT3991EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.19 V ~ 30 V |
| 输入电压： | 4.3 V ~ 55 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 200kHz ~ 2MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3991/LT3991-3.3/LT3991-5
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C, unless otherwise noted.
V OUT
100mV/
DIV
I L
500mA/
DIV
Transient Load Response,
Load Current Stepped from
0.5A to 1A
V SW
5V/DIV
I L
500mA/DIV
V OUT
20mV/DIV
Switching Waveforms;
Burst Mode Operation
V SW
5V/DIV
I L
500mA/DIV
V OUT
20mV/DIV
Switching Waveforms; Full
Frequency Continuous Operation
10μs/DIV
3991 G25
5μs/DIV
3971 G26
1μs/DIV
3971 G27
V IN = 48V, V OUT = 3.3V
C OUT = 47μF
PIN FUNCTIONS
V IN = 48V, V OUT = 3.3V
I LOAD = 20mA
C OUT = 47μF
V IN = 48V, V OUT = 3.3V
I LOAD = 1A
C OUT = 47μF
7
BD (Pin 1): This pin connects to the anode of the boost
diode. The BD pin is normally connected to the output.
BOOST (Pin 2): This pin is used to provide a drive volt-
age, higher than the input voltage, to the internal bipolar
NPN power switch.
SW (Pin 3): The SW pin is the output of an internal power
switch. Connect this pin to the inductor, catch diode, and
boost capacitor.
V IN (Pin 4): The V IN pin supplies current to the LT3991’s
internal circuitry and to the internal power switch. This
pin must be locally bypassed.
EN (Pin 5): The part is in shutdown when this pin is low
and active when this pin is high. The hysteretic threshold
voltage is 1.005V going up and 0.975V going down. The EN
threshold is only accurate when V IN is above 4.3V. If V IN is
lower than 4.3V, ground EN to place the part in shutdown.
Tie to V IN if shutdown feature is not used.
FB (Pin 6, LT3991 Only): The LT3991 regulates the FB pin
to 1.19V. Connect the feedback resistor divider tap to this
pin. Also, connect a phase lead capacitor between FB and
V OUT . Typically this capacitor is 10pF.
V OUT (Pin 6, LT3991-3.3/LT3991-5 Only): The LT3991-
3.3 and LT3991-5 regulate the V OUT pin to 3.3V and 5V
respectively. This pin connects to the internal 10MΩ
feedback divider that programs the fixed output voltage.
SS (Pin 7): A capacitor and a series resistor are tied between
SS and ground to slowly ramp up the peak current limit
of the LT3991 on start-up. The soft-start capacitor is only
actively discharged when EN is low. The SS pin is released
when the EN pin goes high. Float this pin to disable soft-
start. The soft-start resistor has a typical value of 100k.
RT (Pin 8): A resistor is tied between RT and ground to
set the switching frequency.
3991fa
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相关代理商/技术参数 |
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| LT3991EDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:55V, 1.2A Step-Down Regulator with 2.8 Quiescent Current |
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| LT3991EMSE#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR MSOP-10 |
| LT3991EMSE#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3991EMSE-3.3#PBF | 功能描述:IC REG BUCK 3.3V 1.2A 10-MSOP 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 |
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