- 您现在的位置：买卖IC网 > PDF目录1829 > LTC3521IFE#TRPBF (Linear Technology)IC REG BUCK BST SYNC ADJ 20TSSOP PDF资料下载
参数资料
| 型号： | LTC3521IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC ADJ 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 0.6 V ~ 5.5 V，1.8 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 600mA，1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3521
PIN FUNCTIONS
(FE/UF Packages)
V OUT3 = 0.6V ? 1 +
R1 ?
?
V OUT2 = 0.6V ? 1 +
R1 ?
?
V OUT1 = 0.6V ? 1 +
R1 ?
?
FB3(Pin1/Pin23): FeedbackVoltagefortheBuckCon-
verter Derived from a Resistor Divider Connected to the
Buck V OUT3 Output Voltage. The buck output voltage is
given by the following equation, where R1 is a resistor
between FB3 and ground, and R2 is a resistor between
FB3 and the buck output voltage:
? R2 ?
?
FB2 (Pin 2/Pin 24): Feedback Voltage for the Buck Con-
verter Derived from a Resistor Divider Connected to the
Buck V OUT2 Output Voltage. The buck output voltage is
given by the following equation, where R1 is a resistor
between FB2 and ground, and R2 is a resistor between
FB2 and the buck output voltage:
? R2 ?
?
SHDN2 (Pin 3/Pin 1): Forcing this pin above 1.4V enables
the buck converter output at SW2. Forcing this pin below
0.4V disables the buck converter. This pin cannot be left
floating.
PGOOD3 (Pin 4/Pin 2): This pin is an open-drain output
which pulls low under any of the following conditions:
V OUT3 buck output voltage is out of regulation, the part is
in overtemperature shutdown, the part is in undervoltage
lockout, or the SHDN3 pin is pulled low.
PGOOD2 (Pin 5/Pin 3): This pin is an open-drain output
which pulls low under any of the following conditions:
V OUT2 buck output voltage is out of regulation, the part is
in overtemperature shutdown, the part is in undervoltage
lockout, or the SHDN2 pin is pulled low.
PGOOD1 (Pin 6/Pin 4): This pin is an open-drain output
which pulls low under any of the following conditions:
V OUT1 buck-boost output voltage is out of regulation, the
part is in overtemperature shutdown, the part is in un-
dervoltage lockout, the buck-boost converter is in current
limit, or the SHDN1 pin is pulled low. See the Operation
section of this data sheet for details on the functionality
of this pin in PWM mode.
V IN (Pin 7/Pin 5): Low Current Power Supply Connection
Used to Power the Internal Circuitry of the LTC3521. This
pin should be bypassed by a 4.7μF, or larger, ceramic
capacitor. The bypass capacitor should be placed as close
to the pin as possible and should have a short return path
to ground. Pins V IN , PV IN1 , and PV IN2 must be connected
together in the application circuit.
GND (Pin 8/Pin 6): Small Signal Ground. This pin is used as
a ground reference for the internal circuitry of the LTC3521.
PWM (Pin 9/Pin 7): Logic Input Used to Choose Between
Burst Mode Operation and PWM Mode for All Three Con-
verters. This pin cannot be left floating.
PWM = Low: Burst Mode operation is enabled on all
three converters. The buck converters will operate in
Burst Mode operation at light current but will automati-
cally transition to PWM operation at high currents. The
buck converters can supply maximum output current
(600mA) in this mode. The buck-boost converter will
operate in variable frequency mode and can only supply
a reduced load current (typically 50mA).
PWM = High: All three converters are forced into PWM
mode operation. The buck converters will remain at
constant-frequency operation until their minimum on-
time is reached. The buck-boost converter will remain
in PWM mode at all load currents.
FB1 (Pin 10/Pin 8): Feedback Voltage for the Buck-Boost
Converter Derived from a Resistor Divider on the Buck-
Boost Output Voltage. The buck-boost output voltage is
given by the following equation, where R1 is a resistor
between FB1 and ground, and R2 is a resistor between
FB1 and the buck output voltage:
? R2 ?
?
SHDN3 (Pin 11/Pin 9): Forcing this pin above 1.4V en-
ables the buck converter output at SW3. Forcing this pin
below 0.4V disables the buck converter. This pin cannot
be left floating.
SHDN1 (Pin 12/Pin 10): Forcing this pin above 1.4V
enables the buck-boost converter. Forcing this pin below
0.4V disables the buck-boost converter. This pin cannot
be left floating.
7
For more information www.linear.com/LTC3521
3521fb
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3522EUD#TRPBF | IC REG BUCK BOOST SYNC ADJ 16QFN |
| LTC3523EUD-2#TRPBF | IC REG BUCK BOOST SYNC ADJ 16QFN |
| LTC3525ESC6-3.3#TRPBF | IC REG BST SYNC 3.3V 0.4A SC70-6 |
| LTC3526BEDC#TRPBF | IC REG BOOST SYNC ADJ 0.5A 6DFN |
| LTC3527EUD-1#TRPBF | IC REG BOOST SYNC ADJ DL 16QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3521IUF#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN 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 |
| LTC3521IUF#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN 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 |
| LTC3522 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous 400mA Buck-Boost and 200mA Buck Converters |
| LTC3522EUD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous 400mA Buck-Boost and 200mA Buck Converters |
| LTC3522EUD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
发布紧急采购，3分钟左右您将得到回复。