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参数资料
| 型号： | LT3990IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.35A 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.21 V ~ 25 V |
| 输入电压： | 4.2 V ~ 62 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 210kHz ~ 2.3MHz |
| 电流 - 输出： | 350mA |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LT3990/LT3990-3.3/LT3990-5
TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C, unless otherwise noted.
V SW
5V/DIV
I L
100mA/DIV
V OUT
5mV/DIV
Switching Waveforms,
Burst Mode Operation
V SW
5V/DIV
I L
200mA/DIV
V OUT
5mV/DIV
Switching Waveforms, Full
Frequency Continuous Operation
2μs/DIV
FRONT PAGE APPLICATION
V IN = 12V
V OUT = 5V
I LOAD = 10mA
f = 600kHz
3990 G28
1μs/DIV
FRONT PAGE APPLICATION
V IN = 12V
V OUT = 5V
I LOAD = 350mA
f = 600kHz
3990 G29
PIN FUNCTIONS (DFN, MSOP)
FB (Pin 1/Pins 1, 2 LT3990 Only): The LT3990 regulates
the FB pin to 1.21V. Connect the feedback resistor divider
tap to this pin. The two FB pins on the MSE package are
connected internally and provide a redundant path for the
feedback divider. Tie the divider to both pins.
V OUT (Pins 1, 2, LT3990-X Only): The LT3990-3.3 and
LT3990-5 regulate the V OUT pin to 3.3V and 5V, respec-
tively. This pin connects to the internal feedback divider
that programs the fixed output voltage. The two V OUT pins
are connected internally and provide a redundant path to
the output. Tie the output to both pins.
EN/UVLO (Pin 2/Pin 4): The part is in shutdown when this
pin is low and active when this pin is high. The threshold
voltage is 1.19V going up with 35mV of hysteresis. Tie to
V IN if shutdown feature is not used. The EN/UVLO threshold
is accurate only when V IN is above 4.2V. If V IN is lower
than 4.2V, ground EN/UVLO to place the part in shutdown.
V IN (Pin 3/Pin 6): The V IN pin supplies current to the
LT3990’s internal circuitry and to the internal power switch.
This pin must be locally bypassed.
GND (Pins 4, 5, Exposed Pad Pin 11/Pin 8, Exposed
Pad Pin 17): Ground. The exposed pad must be soldered
to the PCB.
SW (Pin 6/Pin 9): The SW pin is the output of an internal
power switch. Connect this pin to the inductor.
BOOST (Pin 7/Pin 11): This pin is used to provide a drive
voltage, higher than the input voltage, to the internal bipolar
NPN power switch.
BD (Pin 8/Pin 13): This pin connects to the anode of the
boost diode. This pin also supplies current to the LT3990’s
internal regulator when BD is above 3.2V.
PG (Pin 9/Pin 14): The PG pin is the open-drain output of
an internal comparator. PG remains low until the FB pin
is within 10% of the final regulation voltage. PG is valid
when V IN is above 4.2V and EN/UVLO is high.
RT (Pin 10/Pin 16): A resistor is tied between RT and
ground to set the switching frequency.
NC (Pins 3, 5, 7, 10, 12, 15, MSOP Only): No Connects.
These pins are not connected to internal circuitry and must
be left floating to ensure fault tolerance.
3990fa
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3990IMS | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes |
| LT3990IMSE#PBF | 功能描述:IC REG BUCK ADJ 0.35A 16MSOP 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 |
| LT3990IMSE#TRPBF | 功能描述:IC REG BUCK ADJ 0.35A 16MSOP 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 |
| LT3990IMSE-3.3#PBF | 功能描述:IC REG BUCK ADJ 0.35A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT3990IMSE-3.3#TRPBF | 功能描述:IC REG BUCK ADJ 0.35A 16MSOP 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 |
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