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参数资料
| 型号： | LT3781IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 20-SSOP |
| 标准包装： | 1,800 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 700kHz |
| 占空比： | 100% |
| 电源电压： | 8 V ~ 72 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
LT3781
TYPICAL PERFOR A CE CHARACTERISTICS
Soft-Start Output Current
vs Soft-Start Pin Voltage
Current Sense Amplifier
Bandwidth vs Temperature
60
40
20
T A = 25 ° C
8
7
6
5
4
3
0
0
1
2 3 4
5
2
–55 –35 –15
5
25
45
65
85 105 125
SOFT-START PIN VOLTAGE (V)
3781 G13
PI FU CTIO S
SHDN (Pin 1): Shutdown Pin. Pin voltages exceeding
positive going threshold of 1.25V enables the LT3781.
150mV of input hysteresis resists mode switching insta-
bility.
The SHDN pin can be controlled by either a logic level input
or with an analog signal. This shutdown feature is typically
used for input supply undervoltage protection. A resistor
divider from the converter input supply to the SHDN pin
monitors that supply for control of system power-up
sequencing, etc.
An 18V clamp on the V CC pin is enabled during shutdown
mode, preventing a trickle start circuit from pulling that pin
above maximum operational levels. All other internal
functions are disabled during shutdown.
OVLO (Pin 2): Overvoltage Shutdown Sense. Typically
connected to input supply through a resistor divider. If pin
voltage exceeds 1.25V, LT3781 switching function is
disabled to protect boosted circuitry from exceeding ab-
solute maximum voltage. 40mV of input hysteresis resists
mode switching instability. Exceeding the OVLO threshold
also triggers soft-start reset, resulting in a graceful recov-
ery from an input transient event.
TEMPERATURE ( ° C)
3781 G14
THERM (Pin 3): System Thermal Shutdown. Auxiliary
shutdown pin that is typically used for system thermal
protection. If pin voltage exceeds 1.25V, LT3781
switching function is disabled. 40mV of input hysteresis
resists mode switching instability. Exceeding the THERM
threshold also triggers soft-start reset, resulting in a
graceful recovery.
SGND (Pin 4): Signal Ground Reference. Careful board
layout techniques must be used to prevent corruption of
signal ground reference. High-current switching paths
must be oriented on the converter ground plane such that
currents to/from the switches do not affect the integrity of
the LT3781 signal ground reference.
5V REF (Pin 5): 5V Local Reference. Allows connection of
external loads up to 20mA DC. Typically bypassed with
1 μ F ceramic capacitor to SGND. Reference output is
current limit protected to a typical value of 45mA. If the
load on the 5V reference exceeds the current limit value,
LT3781 switching function is disabled and the soft-start
function is reset.
FSET (Pin 6): Oscillator Timing Pin. Connect a resistor
(R FSET ) from the 5V REF pin to this pin and a capacitor
(C FSET ) from this pin to ground.
3781f
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3782 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782A | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AEFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AEFE#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT3782AEFE#PBF | 制造商:Linear Technology 功能描述:Switch Regulator IC |
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