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| 型号： | LT1765EFE-2.5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2.5V 3A 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.5V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.25MHz |
| 电流 - 输出： | 3A |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
APPLICATIONS INFORMATION
Table 3
The boost diode can be connected to the input, although,
VALUE
IRMS
DCR
HEIGHT
care must be taken to prevent the 2x V IN boost voltage from
PART NUMBER
(μH)
(Amps)
(Ω)
(mm)
exceeding the BOOST pin absolute maximum rating. The
Coiltcraft
additional voltage across the switch driver also increases
DO1608C-222
2.2
2.4
0.07
2.9
power loss, reducing ef?ciency. If available, an independent
Sumida
supply can be used with a local bypass capacitor.
CDRH3D16-1R5
CDRH4D18-1R0
CDC5D23-2R2
CR43-1R4
CDRH5D28-2R6
1.5
1.0
2.2
1.4
2.6
1.6
1.7
2.2
2.5
2.6
0.043
0.035
0.03
0.056
0.013
1.8
2.0
2.5
3.5
3.0
A 0.18μF 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
Toko
700ns on-time, 90mA boost current, and 0.7V discharge
(D62F)847FY-2R4M
(D73LF)817FY-2R2M
2.4
2.2
2.5
2.7
0.037
0.03
2.7
3.0
ripple. This value is then guard banded by 2x for secondary
factors such as capacitor tolerance, ESR and temperature
effects. The boost capacitor value could be reduced under
CATCH DIODE
The diode D1 conducts current only during switch off
time. Peak reverse voltage is equal to regulator input
voltage. Average forward current in normal operation can
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
discharge ripple and improve start up operation.
(
I D ( ) =
V IN
be calculated from:
I OUT V IN ? V OUT
AVG
)
SHUTDOWN AND UNDERVOLTAGE LOCKOUT
Figure 4 shows how to add undervoltage lockout (UVLO)
to the LT1765. Typically, UVLO is used in situations where
the input supply is current limited , or has a relatively high
The only reason to consider a larger than 3A diode is the
worst-case condition of a high input voltage and shorted
output. With a shorted condition, diode current will increase to
a typical value of 4A, determined by peak switch current limit
of the LT1765. A higher forward voltage will also limit switch
current. This is safe for short periods of time, but it would be
prudent to check with the diode manufacturer if continuous
operation under these conditions must be tolerated.
BOOST PIN
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.
LT1765
For most applications, the boost components are a 0.18μF
capacitor and a CMDSH-3 diode. The anode is typically
connected to the regulated output voltage to generate a
INPUT
R1
IN
3μA
7μA
1.33V
V SW
V CC
voltage approximately V OUT above V IN to drive the output
stage. The output driver requires at least 2.7V of headroom
C1
R2
SHDN
GND
+
OUTPUT
throughout the on period to keep the switch fully saturated.
However, the output stage discharges the boost capacitor
during this on time. If the output voltage is less than 3.3V,
Figure 4. Undervoltage Lockout
1765 F04
it is recommended that an alternate boost supply is used.
1765fd
10
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相关代理商/技术参数 |
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| LT1765EFE-3.3 | 功能描述:IC REG BUCK 3.3V 3A 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 |
| LT1765EFE-3.3#PBF | 功能描述:IC REG BUCK 3.3V 3A 16TSSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1765EFE-3.3#PBF | 制造商:Linear Technology 功能描述:Switching Regulator IC |
| LT1765EFE-3.3#TR | 功能描述:IC REG BUCK 3.3V 3A 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 |
| LT1765EFE-3.3#TRPBF | 功能描述:IC REG BUCK 3.3V 3A 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 |
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