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参数资料
| 型号： | LT3640IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK FIX/ADJ DL 28TSSOP |
| 标准包装： | 2,000 |
| 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-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
LT3640
APPLICATIONS INFORMATION
Reverse Protection
500ns/DIV
In battery charging applications or in battery back-up
systems, the output will be held high when the input to the
LT3640 is absent. If the V IN pin is floated and the LT3640 is
enabled, the LT3640’s internal circuitry will pull its quiescent
current through the SW1 pin or the SW2 pin. This is fine if
the system can tolerate a few mA in this state. If the LT3640
is disabled, the SW1 pin and the SW2 pin current will drop
to essentially zero. However, if the V IN pin is grounded while
the high voltage channel output is held high, an external
diode is required at the V IN pin to prevent current being
pulled out of the V IN pin. If the V IN2 pin is grounded while
the low voltage channel output is held high, an external
diode is required at the V IN2 pin to prevent current being
pulled out of the V IN2 pin (Figure 7).
SW1
10V/DIV
I L1
0.5A/DIV
SW2
5V/DIV
I L2
0.5A/DIV
SW1
10V/DIV
I L1
0.5A/DIV
3640 F08a
V IN = 12V V IN2 = V OUT1
V OUT1 = 3.3V/25mA V OUT2 = 1.8V/30mA
(8a)
IN
V IN SW
BST SW1
OUT1
SW2
5V/DIV
EN/UVLO
DA
FB1
+
–
I L2
0.5A/DIV
2μs/DIV
3640 F08b
IN2
V IN2
LT3640
SW2
FB2
+
–
OUT2
V IN = 12V V IN2 = V OUT1
V OUT1 = 3.3V/25mA V OUT2 = 1.8V/20mA
(8b)
2μs/DIV
GND
3640 F07
Figure 7. Diodes Prevent Shorted Inputs from
Discharging a Battery Tied to the Outputs
PFM Operation
To improve efficiency at light loads, the LT3640 auto-
matically switches to pulse frequency modulation (PFM)
operation which minimizes the switching loss and keeps
the output voltage ripples small.
Because the two channels of the LT3640 may have differ-
ent loads, the two channels can have different switching
frequency (Figure 8).
Power-On Reset Timer
Each channel of the LT3640 has a power-on comparator. Both
comparators are enabled when the LT3640 is powered up
and starts monitoring their corresponding feedback voltages.
SW1
10V/DIV
I L1
0.5A/DIV
SW2
5V/DIV
I L2
0.5A/DIV
3640 F08c
V IN = 12V V IN2 = V OUT1
V OUT1 = 3.3V/0mA V OUT2 = 1.8V/30mA
(8c)
Figure 8. PFM Operation
The threshold of power-on comparator is 1.15V for the high
voltage channel, and 550mV for the low voltage channel.
Both RST1 and RST2 are open-drain outputs with weak
internal pull-ups (100k to ~2V). The DC characteristics of
the RST1 and RST2 pull-down strength are shown in the
Typical Performance Characteristics section. The weak
3640f
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3640IUFD | 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 |
| LT3640IUFD#PBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN 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 |
| LT3640IUFD#TRPBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN 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 |
| LT3640IUFDPBF | 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 |
| LT3640IUFDTRPBF | 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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