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| 型号： | LT3689IUD-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 0.7A 16QFN |
| 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： | 5V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 700mA |
| 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-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
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LT3689/LT3689-5
700mA Step-Down
Regulator with Power-On Reset
and Watchdog Timer
Wide Input Range:
85μA I Q at 12V IN to 3.3V OUT
Low Ripple Burst Mode ? Operation Allows Output
Programmable, Defeatable Watchdog Timer with
Programmable Power-On Reset Timer (POR)
Synchronizable, Adjustable 350kHz to 2.2MHz
700mA Output Switching Regulator with Internal
Fixed 5V or Adjustable Output Voltage
800mV Feedback Voltage
Programmable Input Undervoltage Lockout with
16-Pin 3mm × 3mm QFN and 16-Pin MSOP Packages
Automotive Electronic Control Units
Industrial Power Supplies
FEATURES
n
Operation from 3.6V to 36V
Overvoltage Lockout Protects Circuits through
60V Transients
n
n
Ripple <15mV P-P
n
Window or Timeout Control
n
n
Switching Frequency
n
Power Switch
n
n
n
Hysteresis
n
APPLICATIONS
n
n
TYPICAL APPLICATION
DESCRIPTION
The LT ? 3689 is an adjustable frequency (350kHz to 2.2MHz)
monolithic step-down switching regulator with a power-on
reset and watchdog timer. The regulator operates from
inputs up to 36V and withstands transients up to 60V. Low
ripple Burst Mode ? operation maintains high efficiency at
low output current while keeping output ripple below 15mV
in a typical application, with input quiescent current of just
85μA. Shutdown circuitry reduces input supply current to
less than 1μA while EN/UVLO is pulled low. Using a resis-
tor divider on the EN/UVLO pin provides a programmable
undervoltage lockout. Current limit, frequency foldback
and thermal shutdown provide fault protection.
The reset and watchdog timeout periods are indepen-
dently adjustable using external capacitors. Tight accuracy
specifications and glitch immunity ensure reliable reset
operation of a system without false triggering. The open
collector RST will pull down if output voltage drops 10%
below the programmed value. The watchdog timer is
pin-selectable for window or timeout modes. In timeout
mode, WDO pulls low if too long of a period passes before
a watchdog transition is detected. In window mode, the
LT3689 monitors for WDI falling edges grouped too close
together or too far apart.
L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
2.2μF
μP
LT3689
316k
C WDT
C POR
C POR
SYNC
GND
t WDU = 182ms 20.5k 100k
t WDL = 5.9ms
T A = 25°C
3.3VRegulatorwithPower-OnResetTimerandWatchdogTimer
V IN
4.5V TO 36V
TRANSIENT TO 60V V IN EN/UVLO OUT
BST
0.1μF 12μH
I/O WDI SW
10pF
I/O WDO
RESET RST DA
FB
C WDT RT
10nF
68nF
t RST = 157ms f SW = 700kHz
3689 TA01
3.3V
700mA
22μF
90
V IN = 12V
80 V OUT = 3.3V
f = 700kHz
70 L = 12μH
60
50
40
30
20
10
0
0.0001 0.001
Efficiency
0.01
0.1
1
1000
100
10
1
For more information www.linear.com/LT3689
LOAD CURRENT (A)
3689 TA01b
3689fe
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3689IUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3689IUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer |
| LT3690 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 4A, 1.5MHz Synchronous Step-Down Switching Regulator |
| LT3690EUFE#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN 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 |
| LT3690EUFE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN 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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