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参数资料
| 型号： | LT3508EUF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A DUAL SWITCHING CONTROLLER, 1060 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, PLASTIC, MO-220WGGD-X, QFN-24 |
| 文件页数： | 21/24页 |
| 文件大小： | 365K |
| 代理商： | LT3508EUF |
LT3508
6
3508f
PIN FUNCTIONS
BOOST1, BOOST2: The BOOST pins are used to provide
drive voltages, higher than the input voltage, to the internal
NPN power switches. Tie through a diode to a 2.8V or
higher supply, such as VOUT or VIN.
Exposed Pad: The Exposed Pad metal of the package pro-
vides both electrical contact to ground and good thermal
contact to the printed circuit board. The Exposed Pad must
be soldered to the circuit board for proper operation.
FB1, FB2: The LT3508 regulates each feedback pin to
0.800V. Connect the feedback resistor divider taps to
these pins.
GND: Tie the GND pins directly to the Exposed Pad and
ground plane.
PG1, PG2: The power good pins are the open-collector
outputs of an internal comparator. PG remains low until
the FB pin is within 10% of the nal regulation voltage.
As well as indicating output regulation, the PG pins can
be used to sequence the two switching regulators. These
pins can be left unconnected. The PG outputs are valid
when VIN1 is greater than 2.4V and SHDN is high. The PG
comparators are disabled in shutdown.
RT/SYNC: The RT/SYNC pin is used to set the internal
oscillator frequency. Tie a 33.2k resistor from RT/SYNC
to GND for a 1MHz switching frequency. To synchronize
the part to an external frequency, drive the RT/SYNC pin
with a logic-level signal with positive and negative pulse
widths of at least 80ns.
SHDN: The shutdown pin is used to put the LT3508 in
shutdown mode. Pull the pin below 0.3V to shut down the
LT3508. The 2.63V threshold can function as an accurate
undervoltage lockout (UVLO), preventing the regulator
from operating until the input voltage has reached the
programmed level. Do not drive
SHDN more than 6V
above VIN1.
SW1, SW2: The SW pins are the outputs of the internal
power switches. Connect these pins to the inductors, catch
diodes and boost capacitors.
TRACK/SS1, TRACK/SS2: The TRACK/SS pins are used
to soft-start the two channels, to allow one channel to
track the other output, or to allow both channels to track
another output. For tracking, tie a resistor divider to this
pin from the tracked output. For soft-start, tie a capacitor
to this pin. An internal 1.2A soft-start current charges
the capacitor to create a voltage ramp at the pin. Leave
these pins disconnected if unused.
VC1, VC2: The VC pins are the outputs of the internal error
amps. The voltages on these pins control the peak switch
currents. These pins are normally used to compensate the
control loops, but can also be used to override the loops.
Pull these pins to ground with an open drain to shut down
each switching regulator.
VIN1: The VIN1 pin supplies current to the LT3508 internal
circuitry and to the internal power switch connected to
SW1 and must be locally bypassed. VIN1 must be greater
than 3.7V for channel 1 or channel 2 to operate.
VIN2: The VIN2 pin supplies current to the internal power
switch connected to SW2 and must be locally bypassed.
Connect this pin directly to VIN1 unless power for chan-
nel 2 is coming from a different source. VIN2 must be
greater than 3V and VIN1 must be greater than 3.7V for
channel 2 to operate.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3508EUF#PBF | 功能描述:IC REG BUCK ADJ 1.4A DL 24QFN 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 |
| LT3508EUF#TRPBF | 功能描述:IC REG BUCK ADJ 1.4A DL 24QFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3508EUFPBF | 制造商:Linear Technology 功能描述:Sw. Regulator Dual 1.4A Step-Down QFN24 |
| LT3508EUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.4A Step-Down Switching Regulator |
| LT3508EUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.4A Step-Down Switching Regulator |
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