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参数资料
| 型号： | LT3689IUD-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 29/34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
APPLICATIONS INFORMATION
ground traces will shield them from the SW and BOOST
nodes. The Exposed Pad on the bottom of the package
must be soldered to ground so that the pad acts as a heat
sink. To keep thermal resistance low, extend the ground
plane as much as possible, and add thermal vias under
and near the LT3689 to additional ground planes within
the circuit board and on the bottom side.
High Temperature Considerations
The PCB must provide heat sinking to keep the LT3689
cool. The Exposed Pad on the bottom of the package
must be soldered to a ground plane. This ground should
be tied to large copper layers below with thermal vias;
these layers will spread the heat dissipated by the LT3689.
Placing additional vias can reduce thermal resistance
further. Because of the large output current capability of
the LT3689, it is possible to dissipate enough heat to raise
the junction temperature beyond the absolute maximum
of 125°C (150°C for H-grade). When operating at high
ambient temperatures, the maximum load current should
be derated as the ambient temperature approaches 125°C
(150°C for H-grade). A board measuring 5cm × 7.5cm with
a top layer layout similar to Figure 15 was evaluated in
still air at 3.3V OUT , 700kHz switching frequency. At 700mA
load, the temperature reached approximately 12°C above
ambient for input voltages equal to 12V and 24V. Power
dissipation within the LT3689 can be estimated by calculat-
ing the total power loss from an efficiency measurement
and subtracting the catch diode loss. The die temperature
is calculated by multiplying the LT3689 power dissipation
by the thermal resistance from junction-to-ambient.
Other Linear Technology Publications
Application Notes 19, 35 and 44 contain more detailed
descriptions and design information for buck regulators
and other switching regulators. The LT1376 data sheet
has a more extensive discussion of output ripple, loop
compensation and stability testing. Design Note 318
shows how to generate a bipolar output supply using a
buck regulator.
TYPICAL APPLICATIONS
5V Step-Down Converter
C1
1μF
V IN
6.3V TO 36V
TRANSIENT
TO 60V
WINDOW TIMEOUT
W /T
V IN
EN/UVLO
OUT
BST
C POR
LT3689
μP
I/O
I/O
RESET
WATCHDOG_DEFEAT WDE
WDI
WDO
RST
C WDT
C6
10nF
t WDU = 182ms C5
68nF
t RST = 157ms
GND
SW
DA
FB
RT
SYNC
f SW = 1MHz
C2
0.1μF
D1
R T
12.7k
L1
12μH
C4
5.6pF
R1
536k
R2
102k
3689 TA02
5V
700mA
C3
10μF
L1: CDR125NP-12MC
D1: MBRM140
C1, C2, C3: X7R or X5R
3689fe
For more information www.linear.com/LT3689
29
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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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