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參數(shù)資料
| 型號(hào)： | LT3781EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Bootstrap Start Dual Transistor Synchronous Forward Controller |
| 中文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 267K |
| 代理商： | LT3781EG |
6
LT3781
3781i
TYPICAL PERFOR U
Soft-Start Output Current
vs Soft-Start Pin Voltage
Current Sense Amplifier
Bandwidth vs Temperature
SOFT-START PIN VOLTAGE (V)
0
S
μ
A
20
40
60
1
0
2
3
4
3781
G13
5
T
A
= 25
°
C
TEMPERATURE (
°
C)
–55
2
C
3
5
6
7
–15
25
45
125
3781 G14
4
–35
5
65
85 105
8
PIU
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.
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LT3781EG#PBF | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LT3781EG#TR | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3781EG#TRPBF | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3781IG | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LT3781IG#PBF | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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