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参数资料
| 型号： | LT3688HFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.8A DL 24TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 32.4 V |
| 输入电压： | 3.8 V ~ 36 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 500kHz ~ 2.1MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-TSSOP |
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LT3688
PIN FUNCTIONS
(QFN/TSSOP)
RT (Pin 1/Pin 22): The RT pin is used to set the internal
oscillator frequency. Tie a resistor from RT to GND to set
the switching frequency.
SYNC (Pin 2/Pin 23): Drive the SYNC pin with a logic-
level signal with positive and negative pulse widths of at
least 150ns. Do not ?oat this pin. Tie to GND if the SYNC
feature is not used.
EN/UVLO (Pin 3/Pin 24): The EN/UVLO pin is used to put
the LT3688 in shutdown mode. Pull the pin below 0.3V to
shut down the LT3688. The 1.25V threshold can function
as an accurate undervoltage lockout (UVLO), preventing
the regulator from operating until the input voltage has
reached the programmed level.
FB1, FB2 (Pins 4, 15/Pins 1, 12): The LT3688 regulates
the feedback pins to 0.800V. Connect the feedback resistor
divider taps to this pin.
RUN/SS1, RUN/SS2 (Pins 5, 14/Pins 2, 11): Place a
capacitor from RUN/SS to GND to program the soft start
period. Use a 1000pF or larger capacitor at these pins. To
ensure the SS capacitors are discharged, internal circuitry
pulls the RUN/SS pins low and disables switching during
startup before initiating the soft-start sequence. Once
the RUN/SS pins fall below 0.2V, the pull down turns off,
the SS capacitors start charging again, and switching is
enabled. Do not drive these pins directly. Use an open
drain or collector to pull them low, if necessary.
BST1, BST2 (Pins 6, 13/Pins 3, 10): The BST pins are
used to provide drive voltage, higher than the input volt-
age, to the internal NPN power switches.
SW1, SW2 (Pins 7, 12/Pins 4, 9): The SW pins are the
outputs of the internal power switches. Connect these
pins to the inductors, catch diodes and boost capacitors.
DA1, DA2 (Pins 8, 11/Pins 5, 8): Tie the DA pin to the
anode of the external catch Schottky diode. If the DA pin
current exceeds 1.2A, which could occur in an overload
or short-circuit condition, switching is disabled until the
DA pin current falls below 1.2A.
V IN (Pin 9/Pin 6): The V IN pin supplies current to the
LT3688’s internal circuitry and to the internal power
switches and must be locally bypassed.
CONFIG (Pin 10/Pin 7): The CONFIG pin programs the
start-up sequence of the two voltage regulators and the
behavior of the power-on reset and watchdog timers. To
select one of three con?guration options, tie the CONFIG pin
to V IN , tie the CONFIG pin to GND or leave the CONFIG pin
?oating. With the CONFIG pin tied to V IN , each reset output
depends on its respective FB pin. Channel 2 only starts when
FB1 rises above 0.72V, and the watchdog timer only starts
when both RST pins go high. With the CONFIG pin tied to
GND, both RST pins pull low until both FB pins rise above
0.72V and the POR timer programmed by C POR1 expires.
Again, channel 2 only starts when FB1 rises above 0.72V,
and the watchdog timer only starts when both RST pins go
high. Tie C POR2 to GND if the CONFIG pin is tied low. With
the CONFIG pin ?oating, both channels start coincidentally,
each reset output depends on its respective FB pin, and the
watchdog timer starts when RST1 goes high.
RST1 , RST2 (Pins 17, 16/Pins 14, 13): The RST pins are
active low, open-drain logic outputs with a weak pull-up to
BIAS. After V FB rises above 0.72V, the reset remains asserted
for the period set by the capacitor on the C POR pin. Tie the
RST pins to BIAS with a 100k resistor for a stronger pull-up.
WDO (Pin 18/Pin 15): WDO will go low if the micropro-
cessor fails to drive the WDI pin of the LT3688 with the
appropriate signal. Tie the WDO pin to BIAS with a 100k
resistor for a stronger pull-up. Keep capacitive loading on
this pin below 1000pF.
WDE (Pin 19/Pin 16): The watchdog timer enable pin
disables the watchdog timer if the WDE voltage exceeds
1V. Float this pin or tie to ground for normal operation.
WDI (Pin 20/Pin 17): The watchdog timer input pin
receives the watchdog signal from the microprocessor.
If two or more negative edges occur on WDI before the
programmed fast timer period or no negative edge occurs
within the slow timer period, the part will pulse WDO low
with a pulse width of 1/8th of the slow timer period. Drive
the WDI pin with a pulse width of at least 300ns.
BIAS (Pin 22/Pin 19): The BIAS pin supplies current to the
internal circuitry when BIAS is above 3V, helping reduce
input quiescent current. The internal Schottky diodes are
connected from BIAS to BST, providing the charging path
for the boost capacitors.
3688f
8
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| LT3688IFE#PBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24TSSOP 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 |
| LT3688IFE#TRPBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24TSSOP 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 |
| LT3688IFEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA Step-Down Switching Regulator with Power-On Reset |
| LT3688IUF#PBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24QFN 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 |
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