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参数资料
| 型号： | LT3970HMS-3.3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 0.35A 10MSOP |
| 标准包装： | 50 |
| 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： | 管件 |
| 供应商设备封装： | 10-MSOP |
LT3970 Series
APPLICATIONS INFORMATION
V IN
V IN
LT3970
160
120
V IN(EN) = 6V
R3 = 5M
R4 = 1M
R3
EN
1V
+
–
SHDN
80
40
120
R4
3970 F06
Figure 6. Enable
Be aware that while V IN is below 4.2V, the input current
may rise up to several hundred μA and the part may begin
to switch while the internal circuitry starts up. Figure 7
shows the startup behavior of a typical application with
different programmed V IN(EN) .
Shorted and Reversed Input Protection
If the inductor is chosen so that it won’t saturate exces-
sively, a LT3970 buck regulator will tolerate a shorted
output. There is another situation to consider in systems
where the output will be held high when the input to the
LT3970 is absent. This may occur in battery charging ap-
plications or in battery backup systems where a battery
or some other supply is diode ORed with the LT3970’s
output. If the V IN pin is allowed to float and the EN pin
is held high (either by a logic signal or because it is tied
to V IN ), then the LT3970’s internal circuitry will pull its
quiescent current through its SW pin. This is fine if the
system can tolerate a few μA in this state. If the EN pin is
grounded, the SW pin current will drop to 0.7μA. However,
if the V IN pin is grounded while the output is held high,
regardless of EN, parasitic diodes inside the LT3970 can
pull current from the output through the SW pin and the
V IN pin. Figure 8 shows a circuit that will run only when
the input voltage is present and that protects against a
shorted or reversed input.
0
4
3
2
1
0
0 1 2 3 4 5 6 7 8
INPUT VOLTAGE (V)
160
V IN(EN) = 12V
R3 = 11M
R4 = 1M
80
40
0
4
3
2
1
0
0 2 4 6 8 10 12 14
INPUT VOLTAGE (V)
3970 F07
Figure 7. V IN Start-Up of Front Page Application with V OUT = 3.3V,
No-Load Current, and V IN(EN) programmed as in Figure 6.
D4
MBRS140 BD
V IN V IN BOOST
LT3970
EN SW V OUT
GND
FB
+
BACKUP
15
3970 F08
Figure 8. Diode D4 Prevents a Shorted Input from Discharging a
Backup Battery Tied to the Output. It Also Protects the Circuit from
a Reversed Input. The LT3970 Runs Only when the Input is Present
3970fc
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相关代理商/技术参数 |
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| 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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