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参数资料
| 型号： | LT3640EUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK FIX/ADJ DL 28QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 2 |
| 输出电压： | 1.8V，3.3V，可调 |
| 输入电压： | 2.5 V ~ 35 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 1.1A，1.3A |
| 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-QFN（4x5） |
LT3640
Dual Monolithic Buck
Regulator with Power-On
Reset and Watchdog Timer
High Voltage Buck Regulator:
OVLO Protects Input to 55V
Low Voltage Synchronous Buck Regulator:
Synchronizable, Adjustable 350kHz to 2.5MHz
Programmable Power-On Reset Timer
Programmable Window Mode Watchdog Timer
Typical Quiescent Current: 290μA
Short-Circuit Robust
Programmable Soft-Start
Low Shutdown Current: I Q < 1μA
Available in Thermally Enhanced 28-Lead
Industrial Power Supplies
Automotive Electronic Control Units
FEATURES
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4V to 35V Operating Range
1.3A Output Current
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2.5V to 5.5V Input Voltage Range
1.1A Output Current
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Switching Frequency
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(4mm × 5mm) QFN and 28-Lead TSSOP Packages
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
DESCRIPTION
The LT ? 3640 is a dual channel, current mode monolithic
buck switching regulator with a power-on reset and a
watchdog timer. Both regulators are synchronized to a
single oscillator with an adjustable frequency (350kHz to
2.5MHz). At light loads, both regulators operate in low
ripple Burst Mode ? to maintain high efficiency and low
output ripple.
The high voltage channel is a nonsynchronous buck with
an internal 2.4A top switch that operates from an input
of 4V to 35V; a 36.5V OVLO protects the device to 55V.
The low voltage channel operates from an input of 2.5V to
5.5V. Internal synchronous power switches provide high
efficiency without the need of external Schottky diode.
Both channels have cycle-by-cycle current limit, providing
protection against shorted outputs.
The power-on reset and watchdog timeout periods are
both adjustable using external capacitors. The window
mode watchdog timer flags when the μP pulses group
too close together or too far apart.
The LT3640 is available in a 28-pin 4mm × 5mm QFN
package and 28-pin TSSOP package. Both packages have
an exposed pad for low thermal resistance.
10μF
V OUT1
WDE
PGOOD
V OUT1
2MHz 3.3V/0.8A and 1.8V/0.8A Step Down Regulators
0.22μF
V IN
5V TO 35V
3.3μH
EN/UVLO V IN SW BST SW1 3.3V/0.8A
SYNC 80.6k
DA 22μF
FB1
49.9k
90
85
HV Channel Efficiency,
2MHz, V OUT1 = 3.3V
V IN = 12V
90
85
LV Channel Efficiency,
2MHz, V OUT2 = 1.8V
V IN2 = 3.3V
100k
100k
RST1
LT3640
V IN2
80
80
μP
1.5nF
RST2
WDO
WDI
CWDT
CPOR RT GND SS2
1.5nF
32.4k
EN2
SW2
FB2
SS1
1nF
1nF
1μH
100k
49.9k
V OUT2
1.8V/0.8A
22μF
75
70
0
0.2
0.4 0.6 0.8 1.0
V OUT1 CURRENT (A)
1.2
3640 TA01b
75
70
0
0.2
0.4 0.6
V OUT2 CURRENT (A)
0.8
3640 TA01c
1
3640 TA01a
3640f
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3640IFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640IFE#PBF | 功能描述:IC REG BUCK FIX/ADJ DL 28TSSOP 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 |
| LT3640IFE#TRPBF | 功能描述:IC REG BUCK FIX/ADJ DL 28TSSOP 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 |
| LT3640IFEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640IFETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
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