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参数资料
| 型号： | LT3686EDD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 3/28页 |
| 文件大小： | 509K |
| 代理商： | LT3686EDD#PBF |
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LT3686
11
3686fc
ApplicAtions inForMAtion
Figure 3. Continuous Mode Operation Near Minimum On Time
When the required on time decreases below the typical
minimum on time of 100ns, instead of the switch pulse
width becoming narrower to accommodate the lower duty
cycle requirement, the switch pulse width remains fixed at
100ns. The inductor current ramps up to a value exceed-
ing the load current and the output ripple increases. The
part then remains off until the output voltage dips below
the programmed value before it begins switching again
(Figure 4).
Provided that the load can tolerate the increased output
voltagerippleandthatthecomponentshavebeenproperly
selected, operation while pulse skipping is safe and will
not damage the part. As the input voltage increases, the
inductor current ramps up quicker, the number of skipped
pulses increases, and the output voltage ripple increases.
Inductor current may reach current limit when operating
in pulse skip mode with small valued inductors. In this
case, the LT3686 will periodically reduce its frequency to
keep the inductor valley current to 1.7A (Figure 5). Peak
Figure 4. Pulse Skip Occurs When Required On Time Is
Below 100ns
The maximum input voltage is determined by the absolute
maximum ratings of the VIN and BOOST pins. For fixed
frequency operation, the maximum input voltage is de-
termined by the minimum duty cycle DCMIN:
VIN(MAX) =
VOUT + VD
DCMIN
– VD + VSW
DCMIN can be adjusted with frequency. Note that this is a
restrictionontheoperatinginputvoltageforfixedfrequency
operation; the circuit will tolerate transient inputs up to
the absolute maximum ratings of the VIN and BOOST pins.
Minimum On Time
As the input voltage is increased, the LT3686 is required
to switch for shorter periods of time. Delays associated
with turning off the power switch dictate the minimum on
time of the part. The minimum on time for the LT3686 is
100ns (Figure 3).
VIN = 18V
VOUT = 3.3V
L = 6.8H
COUT = 22F
ILOAD = 1.2mA
VOUT
100mV/DIV
AC
VSW
10V/DIV
IL
500mA/DIV
500ns/DIV
3686 F03
VIN = 35V
VOUT = 3.3V
L = 6.8H
COUT = 22F
IOUT = 300mA
VSW
20V/DIV
IL
500mA/DIV
VOUT
100mA/DIV
AC
2s/DIV
3686 F04
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3686EDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
| LT3686HDD#PBF | 功能描述:IC REG BUCK ADJ 1.2A 10-DFN 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 |
| LT3686HDD#PBF | 制造商:Linear Technology 功能描述:IC PWM STEP-DOWN DC/DC CONVERTER DFN10 制造商:Linear Technology 功能描述:IC, PWM STEP-DOWN DC/DC CONVERTER, DFN10 |
| LT3686HDD#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 10DFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3686IDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
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