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参数资料
| 型号： | LT3690HUFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 26QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 20 V |
| 输入电压： | 3.9 V ~ 36 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 138kHz ~ 1.5MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 26-QFN-EP（4x6） |
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LT3690
APPLICATIONS INFORMATION
Since the LT3690 operates at a lower current limit during
Burst Mode operation, the noise is typically very quiet. If
this is unacceptable, use a high performance tantalum or
electrolytic capacitor at the output.
Frequency Compensation
The LT3690 uses current mode control to regulate the
output. This simplifies loop compensation. In particular, the
LT3690 does not require the ESR of the output capacitor
for stability, so you are free to use ceramic capacitors to
achieve low output ripple and small circuit size.
Frequency compensation is provided by the components
tied to the V C pin, as shown in Figure 1. Generally a capaci-
tor (C C ) and a resistor (R C ) in series to ground are used. In
addition, there may be a lower value capacitor in parallel.
This capacitor (C F ) is not part of the loop compensation
but is used to filter noise at the switching frequency, and
is required only if a phase-lead capacitor is used or if the
output capacitor has high ESR.
Loop compensation determines the stability and transient
performance. The best values for the compensation net-
work depend on the application and, in particular, the type
of output capacitor. A practical approach is to start with
LT3690
one of the circuits in this data sheet that is similar to your
application and tune the compensation network to optimize
the performance. Stability should then be checked across all
operating conditions, including load current, input voltage
and temperature. The LT1375 data sheet contains a more
thorough discussion of loop compensation and describes
how to test the stability using a transient load.
Figure 1 shows an equivalent circuit for the LT3690 control
loop. The error amplifier is a transconductance amplifier
with finite output impedance. The power section, consisting
of the modulator, power switch and inductor, is modeled
as a transconductance amplifier generating an output
current proportional to the voltage at the V C pin. Note that
the output capacitor integrates this current, and that the
capacitor on the V C pin (C C ) integrates the error amplifier
output current, resulting in two poles in the loop. In most
cases, a zero is required and comes either from the output
capacitor ESR or from a resistor R C in series with C C .
This simple model works well as long as the value of the
inductor is not too high and the loop crossover frequency
is much lower than the switching frequency. A phase lead
capacitor (CPL) across the feedback divider may improve
the transient response.
CURRENT MODE
POWER STAGE
g m = 4.6S
SW
FB
R1
C PL
OUTPUT
V OUT
100mV/DIV
R2
20μs/DIV
C F
V C
3M
R C
C C
g m = 400μS
0.8V
GND
+
POLYMER
OR
TANTALUM
OR
ELECTROLITIC
ESR
C1
C1
CERAMIC
I L
2A/DIV
3690 F02
V IN = 12V, I LOAD STEPPED BETWEEN 0.6A AND 3.5A
FRONT PAGE APPLICATION
Figure 2. Transient Load Response
3690 F01
Figure 1. Model for Loop Response
3690fa
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3690IUFE#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN 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 |
| LT3690IUFE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN 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 |
| LT3690MPUFE#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN 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 |
| LT3690MPUFE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN 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 |
| LT3692 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking |
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