- 您现在的位置：买卖IC网 > PDF目录13879 > LT1766IFE-5 (Linear Technology)IC REG BUCK 5V 1.5A 16TSSOP PDF资料下载
参数资料
| 型号： | LT1766IFE-5 |
| 厂商： | Linear Technology |
| 文件页数： | 17/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.5A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
LT1766/LT1766-5
APPLICATIONS INFORMATION
R LO ( V IN ? 2 . 38 V )
2 . 38 V ? R LO ( 5 . 5 μ A )
BOOST PIN
For most applications, the boost components are a 0.33μF
capacitor and a 1N4148W diode. The anode is typically
connected to the regulated output voltage to generate a
voltage approximately V OUT above V IN to drive the output
stage. However, the output stage discharges the boost ca-
pacitor during the on time of the switch. The output driver
requires at least 3V of headroom throughout this period
to keep the switch fully saturated. If the output voltage is
less than 3.3V, it is recommended that an alternate boost
supply is used. The boost diode can be connected to the
input, although, care must be taken to prevent the 2× V IN
boost voltage from exceeding the BOOST pin absolute
maximum rating. The additional voltage across the switch
driver also increases power loss, reducing ef?ciency. If
available, and independent supply can be used with a local
bypass capacitor.
A 0.33μF boost capacitor is recommended for most ap-
plications. Almost any type of ?lm or ceramic capacitor
is suitable, but the ESR should be <1Ω to ensure it can
be fully recharged during the off time of the switch. The
capacitor value is derived from worst-case conditions of
4700ns on time, 42mA boost current and 0.7V discharge
ripple. The boost capacitor value could be reduced under
less demanding conditions, but this will not improve cir-
cuit operation or ef?ciency. Under low input voltage and
low load conditions, a higher value capacitor will reduce
SHUTDOWN FUNCTION AND UNDERVOLTAGE
LOCKOUT
Figure 4 shows how to add undervoltage lockout (UVLO)
to the LT1766. Typically, UVLO is used in situations where
the input supply is current limited, or has a relatively high
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.
Threshold voltage for lockout is about 2.38V. A 5.5μA
bias current ?ows out of the pin at this threshold. The
internally generated current is used to force a default high
state on the shutdown pin if the pin is left open. When
low shutdown current is not an issue, the error due to this
current can be minimized by making R LO 10k or less. If
shutdown current is an issue, R LO can be raised to 100k,
but the error due to initial bias current and changes with
temperature should be considered.
R LO = 10 k to 100k ( 25k suggested )
R HI =
V IN = Minimum input voltage
discharge ripple and improve start-up operation.
R FB
LT1766
L1
INPUT
IN
2.38V
+
V SW
OUTPUT
STANDBY
R HI
5.5μA
–
SHDN
+
TOTAL
SHUTDOWN
+
C1
C2
R LO
0.4V
–
GND
1766 F04
Figure 4. Undervoltage Lockout
1766fc
17
相关PDF资料 |
PDF描述 |
|---|---|
| SC32-1R4 | INDUCTOR SMD 1.4UH 2.04A 7.96MHZ |
| GCM43DSUH | CONN EDGECARD 86POS DIP .156 SLD |
| EGM18DRMT | CONN EDGECARD 36POS .156 WW |
| LT3508HFE#TRPBF | IC REG BUCK ADJ 1.4A DL 16TSSOP |
| EMM12DRAI | CONN EDGECARD 24POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1766IFE-5#PBF | 功能描述:IC REG BUCK 5V 1.5A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1766IFE-5#TR | 功能描述:IC REG BUCK 5V 1.5A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1766IFE-5#TRPBF | 功能描述:IC REG BUCK 5V 1.5A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1766IFE-5-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| LT1766IFE-5-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
发布紧急采购，3分钟左右您将得到回复。