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参数资料
| 型号： | LT3692EUH#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32 |
| 文件页数： | 6/36页 |
| 文件大小： | 526K |
| 代理商： | LT3692EUH#PBF |
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LT3692
14
3692f
APPLICATIONS INFORMATION
The maximum input voltage is determined by the absolute
maximum ratings of the VIN and BST pins and by the
frequency and minimum duty cycle. The minimum duty
cycle is defined as:
DCMIN = tON(MIN) Frequency
Maximum input voltage as:
VIN(MAX) =
VOUT + VD
DCMIN
– VD + VSW
Note that the LT3692 will regulate if the input voltage is
taken above the calculated maximum voltage as long as
maximum ratings of the VIN and BST pins are not violated.
However operation in this region of input voltage will
exhibit pulse skipping behavior.
Example:
VOUT = 3.3V, IOUT = 1A, Frequency = 1MHz, Temperature
= 25°C, VSW = 0.1V, B = 50 (from boost characteristics
specification), VD = 0.4V, tON(MIN) = 225ns:
DCMAX =
1
+
1
50
= 98%
VIN(MIN) =
3.3
+ 0.4
0.98
– 0.4
+ 0.1= 3.48V
DCMIN = tON(MIN) Frequency = 0.225
VIN(MAX) =
3.3
+ 0.4
0.225
– 0.4
+ 0.1= 16.1V
In cases where multiple input voltages are present, or the
VIN/VOUT ratio for channel 1 is significantly different than
channel 2, channel 1’s frequency can be divided by a factor
of 2, 4 or 8 from the programmed value by setting the DIV
pin resistor to the appropriate value. Dividing channel 1’s
frequency will increase the maximum input voltage by the
same ratio. Channel 1’s external components will have to
be chosen according to the resulting frequency.
Example:
VOUT = 3.3V, IOUT = 1A, Frequency = 1MHz, Temperature
= 25°C, VSW = 0.1V, B = 50 (from boost characteristics
specification), VD = 0.4V, tON(MIN) = 225ns. VDIV = 0.75V.
DCMIN1 = tON(MIN1) Frequency/2 = 0.1125
VIN1(MAX) =
3.3
+ 0.4
0.1125
– 0.4
+ 0.1= 32.6V
Inductor Selection and Maximum Output Current
A good first choice for the LT3692 inductor value is:
L
=
VOUT
f
where f is frequency in MHz and L is in H.
With this value the maximum load current will be ~3.5A,
independent of input voltage. The inductor’s RMS cur-
rent rating must be greater than your maximum load
current and its saturation current should be higher than
the maximum peak switch current, and will reduce the
output voltage ripple.
If the maximum load for a single channel is lower than
2.5A, then you can decrease the value of the inductor and
operate with higher ripple current, or you can adjust the
maximum switch current for the channel via the ILIM pin.
This allows you to use a physically smaller inductor, or one
with a lower DCR resulting in higher efficiency.
The peak inductor and switch current is:
ISW(PK) = IL(PK) = IOUT +
IL
2
To maintain output regulation, this peak current must be
less than the LT3692’s switch current limit, ILIM. ILIM
Figure 5. Timing Diagram RT/SYNC = 28.0k,
tP = 1s, VDIV = 0.75V
2 tP
tP
1/(2 tP)
tP/2
tDCLKOSW2
tDCLKOSW1
SW1
SW2
CLKOUT
3692 F05
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3692IUH#PBF | 功能描述:IC REG BUCK ADJ 3.5A DL 32QFN 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 |
| LT3692IUH#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A DL 32QFN 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 |
| LT3692IUHPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking 3.5A Step-Down Switching Regulator |
| LT3693 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking |
| LT36931DD#PBF | 制造商:Linear Technology 功能描述: |
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