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参数资料
| 型号： | LT3970HMS-3.3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 0.35A 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 4.2 V ~ 40 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 200kHz ~ 2.25MHz |
| 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-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
LT3970 Series
PIN FUNCTIONS
FB (Pin 1, LT3970 Only): The LT3970 Regulates the FB
Pin to 1.21V. Connect the feedback resistor divider tap to
this pin.
V OUT (Pin 1, LT3970-X Only): The LT3970-3.3, LT3970-3.42
and LT3970-5 regulate the V OUT Pin to 3.3V, 3.42V and 5V
respectively. This pin connects to the internal feedback
divider that programs the fixed output voltage.
EN (Pin 2): The part is in shutdown when this pin is low
and active when this pin is high. The hysteretic threshold
voltage is 1V going up and 0.97V going down. Tie to V IN
if shutdown feature is not used. The EN threshold is ac-
curate only when V IN is above 4.2V. If V IN is lower than
4.2V, ground EN to place the part in shutdown.
V IN (Pin 3): The V IN pin supplies current to the LT3970’s
internal circuitry and to the internal power switch. This
pin must be locally bypassed.
BLOCK DIAGRAM
GND (Pins 4, 5, Exposed Pad (Pin 11, DFN Only)): Ground.
Must be soldered to PCB.
SW (Pin 6): The SW pin is the output of an internal power
switch. Connect this pin to the inductor.
BOOST (Pin 7): This pin is used to provide a drive volt-
age, higher than the input voltage, to the internal bipolar
NPN power switch.
BD (Pin 8): This pin connects to the anode of the boost
diode. This pin also supplies current to the LT3970’s internal
regulator when BD is above 3.2V.
PG (Pin 9): 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 is high.
RT (Pin 10): A resistor is tied between RT and ground to
set the switching frequency.
V IN
C1
3
V IN
1V
+
INTERNAL 1.21V REF
–
BD
8
2
EN
–
SHDN
+
SLOPE COMP
SWITCH LATCH
D BOOST
BOOST
7
R
R T
10
9
RT
PG
+
–
1.09V
+
ERROR
AMP
–
V C
OSCILLATOR
200kHz TO 2.2MHz
Burst Mode
DETECT
S
Q
D CATCH
SW
6
C3
L1
C2
V OUT
R2
R1
GND
(4, 5)
R2
1
LT3970 ONLY
FB
R1
LT3970-X
ONLY*
1
V OUT
3990 BD
* LT3970-3.3: R1 = 12.65M, R2 = 7.35M
LT3970-3.42: R1 = 12.65M, R2 = 6.93M
LT3970-5: R1 = 15.15M, R2 = 4.85M
8
3970fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3970HMS-5#PBF | 功能描述:IC REG BUCK 5V 0.35A 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 |
| LT3970HMS-5#TRPBF | 功能描述:IC REG BUCK 5V 0.35A 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 |
| LT3970HMS-5-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes |
| LT3970HMS-5-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes |
| LT3970IDDB#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 4.2V to 40V 10-Pin DFN EP 制造商:Linear Technology 功能描述:Bulk |
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