参数资料
型号: MAX1729EUB
厂商: Maxim Integrated Products
文件页数: 8/12页
文件大小: 0K
描述: IC REG BUCK BST ADJ 2.5MA 10UMAX
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 50
类型: 降压(降压),升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 2.5 V ~ 16 V
输入电压: 2.7 V ~ 5.5 V
电流 - 输出: 2.5mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 管件
供应商设备封装: 10-µMAX
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
To use a DC control signal to adjust the output voltage,
use the circuit shown in Figure 4. In this configuration,
V OUT is governed by the following equation:
V OUT ≈ 24.67V FB - 22.71V COMP
External Component Value Formulas
1) Given the maximum output voltage needed (V MAX ),
choose the maximum feedback current and solve for
R1 (10μA to 30μA is recommended for maximum feed-
back current) as follows:
V MAX FB
The impedance looking into COMP is nominally 33k ? .
A source output impedance of less than 500 ? is rec-
ommended. Also, ensure V OUT ≤ 18V by keeping
V COMP above 0.6V.
Designing for External Feedback Mode
To solve for V OUT in external feedback mode, assume
the current into the FB pin is zero and the voltage at FB
V IN
R1 =
- V
I FB
L1
220 μ H
+ +
+
R 3 + R 4
? R1
R5 ?
V OUT = R1 ? ? V FB
? ?
? V COMP ? ?
? R5 ? TC
? R 3 + R 4 ?
1 μ F
is 1.228V. Then take the sum of the currents into FB
and solve for V OUT :
? 1 1 1 1 ?
R2
? R1 ? ? R1 ?
? V
PWM
GENERATOR
C1
0.1 μ F
C3
0.1 μ F
IN
GND
MAX1729
REF
CTLIN
LX
PS
OUT
FB
C2
0.068 μ F
V OUT
C4
R1
R5
R2
Using the following formulas, calculate the external
COMP
TC
component values required for MAX1729 operation in
external feedback mode, as shown in Figure 3. An
example follows the formulas.
R4
R3
C6
1 μ F
C5
1000pF
Figure 3. External Feedback Mode
L1
L1
V IN
220 μ H
V IN
220 μ H
C1
0.1 μ F
IN
GND
LX
PS
C2
0.068 μ F
C1
0.1 μ F
IN
GND
LX
PS
C2
0.068 μ F
C3
0.1 μ F
REF
MAX1729
OUT
C4
1 μ F
V OUT
C3
0.1 μ F
REF
MAX1729
OUT
C4
1 μ F
V OUT
DIGITAL
PWM
CTLIN
FB
CTLIN
FB
CONTROLLER
ADC
C5
1000pF
TC
COMP
C6
1 μ F
C5
1000pF
TC
COMP
DC CONTROL
INPUT
V COMP
Figure 2. Internal Feedback Mode
Figure 4. Using a DC Control Signal
8
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MAX1729EUB-T 功能描述:直流/直流开关转换器 ECB & LCD Display Bias Supply RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX172ACNG 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX172ACNG+ 功能描述:模数转换器 - ADC 12-Bit 100ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX172ACWG 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX172ACWG+ 功能描述:模数转换器 - ADC 12-Bit 100ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32