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参数资料
| 型号： | LT3692IUH#TRPBF |
| 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： | 16/36页 |
| 文件大小： | 526K |
| 代理商： | LT3692IUH#TRPBF |
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LT3692
23
3692f
APPLICATIONS INFORMATION
Application Optimization
In multiple channel applications requiring large VIN to
VOUT ratios, the maximum frequency and resulting in-
ductor size is determined by the channel with the largest
ratio. The LT3692’s multi-frequency operation allows the
user to minimize component size for each channel while
maintaining constant frequency operation. The circuit in
Figure 17 illustrates this approach. A 2-stage step-down
approach coupled with multi-frequency operation will
further reduce external component size by allowing an
increase in frequency for the channel with the lower VIN
to VOUT ratio. The drawback to this approach is that the
output power capability for the first stage is determined
by the output power drawn from the second stage. The
dual step-down application in Figure 18 steps down the
input voltage (VIN1) to the highest output voltage then
uses that voltage to power the second output (VIN2).VOUT1
must be able to provide enough current for its output plus
VOUT2 maximum load. Note that the VOUT1 voltage must
be above VIN2’s minimum input voltage as specified in the
Electrical Characteristics (2.8V) when the second channel
starts to switch. Delaying channel 2 can be accomplished
by either independent soft-start capacitors or sequencing
with the CMP01 output.
For example, assume a maximum input of 36V:
VIN = 36V, VOUT1 = 3.3V at 1.5A and VOUT2 = 1.8V at 1.5A.
Frequency (Hz)
=
VOUT + VD
VIN – VSW + VD
1
tON(MIN)
L
=
VIN – VOUT
(
) VOUT
VIN f
Single Step Down:
Frequency (Hz)
=
1.8
+ 0.6
36V – 0.4
+ 0.6
1
225ns
250kHz
L1
=
36V – 3.3
(
) 3.3
36V 250kHz
≥ 12H
L2
=
36V – 1.8
(
) 1.8
36V 250kHz
≥ 6.8H
2-Stage Step-Down:
Frequency (Hz)
=
3.3
+ 0.6
36V – 0.4
+ 0.6
1
225ns
400kHz
L1
=
36V – 3.3
(
) 3.3
36V 400kHz
≥ 7.5H
L2
=
3.3 – 1.8
(
) 1.8
3.3 400kHz
≥ 2H
2-Stage Step-Down Multi-Frequency:
RDIV = 100k, FREQ1 = 400kHz, FREQ2 = 1600kHz.
L1
=
36V – 3.3
(
)3.3
36V 400kHz
≥ 7.5H
L2
=
3.3 – 1.8
(
)1.8
3.3 2MHz
≥ 500nH
In addition, RILIM2 = 40.2k reduces the peak current limit
on channel to 2.5A, which reduces inductor size and catch
diode requirements.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
| LT3693EDD#PBF | 功能描述:IC REG BUCK ADJ 3.5A 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: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 |
| LT3693EDD#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A 10DFN 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 |
| LT3693EDDPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-36V DFN10 |
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