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| 型号： | LT1961EMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.5A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 35 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.25MHz |
| 电流 - 输出： | 1.5A |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LT1961
APPLICATIO N S I N FOR M ATIO N
CATCH DIODE
The suggested catch diode (D1) is a UPS120 or 1N5818
Schottky. It is rated at 1A average forward current and
20V/30V reverse voltage. Typical forward voltage is 0.5V
at 1A. The diode conducts current only during switch off
time. Peak reverse voltage is equal to regulator output
shutdown pin can be used. The threshold voltage of the
shutdown pin comparator is 1.35V. A 3 μ A internal current
source defaults the open pin condition to be operating (see
Typical Performance Graphs). Current hysteresis is added
above the SHDN threshold. This can be used to set voltage
hysteresis of the UVLO using the following:
voltage. Average forward current in normal operation is
equal to output current.
SHUTDOWN AND UNDERVOLTAGE LOCKOUT
Figure 4 shows how to add undervoltage lockout (UVLO)
to the LT1961. Typically, UVLO is used in situations where
the input supply is current limited, or has a relatively high
R 1 =
R 2 =
V H ? V L
7 μ A
1 . 35 V
( V H ? 1 . 35 V ) + 3 μ A
R 1
source resistance. A switching regulator draws constant
power from the source, so source current increases as
source voltage drops. This looks like a negative resistance
load to the source and can cause the source to current limit
or latch low under low source voltage conditions. UVLO
prevents the regulator from operating at source voltages
where these problems might occur.
V H – Turn-on threshold
V L – Turn-off threshold
Example: switching should not start until the input is
above 4.75V and is to stop if the input falls below 3.75V.
V H = 4.75V
V L = 3.75V
LT1961
= 143 k
INPUT
C1
R1
R2
IN
SHDN
3 μ A
7 μ A
1.35V
GND
V CC
1961 F04
R 1 =
R 2 =
4 .75V ? 3 .75V
7 μ A
1 . 35 V
( 4 . 75 V ? 1 . 35 V ) + 3 μ A
143 k
= 50 . 4 k
Figure 4. Undervoltage Lockout
An internal comparator will force the part into shutdown
below the minimum V IN of 2.6V. This feature can be used
to prevent excessive discharge of battery-operated sys-
tems. If an adjustable UVLO threshold is required, the
Keep the connections from the resistors to the SHDN pin
short and make sure that the interplane or surface capaci-
tance to the switching n odes are minimized. If high resis-
tor values are used, the SHDN pin should be bypassed with
a 1nF capacitor to prevent coupling problems from the
switch node.
1961fa
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1961IMS8E | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 1.25MHz Step-Up Switching Regulator |
| LT1961IMS8E#PBF | 功能描述:IC REG BOOST ADJ 1.5A 8MSOP 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: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 |
| LT1961IMS8E#TRPBF | 功能描述:IC REG BOOST ADJ 1.5A 8MSOP 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: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 |
| LT1961IMS8EPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 1.25MHz Step-Up Switching Regulator |
| LT1961IMS8ETR | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 1.25MHz Step-Up Switching Regulator |
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