参数资料
型号: MAX1875EEG+
厂商: Maxim Integrated Products
文件页数: 12/21页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 24-QSOP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 50
PWM 型: 电压模式
输出数: 2
频率 - 最大: 660kHz
占空比: 90%
电源电压: 4.75 V ~ 23 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
包装: 管件
Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
the sum of the resistances in the charging path, includ-
-I PEAK
I LOAD
I LIMIT
ing high-side switch, inductor, and PC board resis-
tances.
Setting the Output Voltage
For 1V or greater output voltages, set the MAX1875/
MAX1876 output voltage by connecting a voltage-
divider from the output to FB_ to GND (Figure 6). Select
R_B (FB_ to GND resistor) to between 1k ? and 10k ? .
Calculate R_A (OUT_ to FB_ resistor) with the following
equation:
R _ A = R _ B ? ? OUT ? -1 ?
0
TIME
? ? V ? ?
? ?
? ? V SET ? ?
V IN ( MIN ) = ? OUT DROP 1 ? + V DROP 2 - V DROP 1
? ? 1- f SW OFF ( MIN ) ? ?
R _ A = R _ C ? SET - OUT ?
Figure 4. “Valley” Current-Limit Threshold Point
where t ON(MIN) is 100ns. The minimum input voltage is
limited by the switching frequency and minimum off-
time, which determine the maximum duty cycle
(D MAX = 1 - f SW t OFF(MIN) ):
? V + V ?
t
where V DROP1 is the sum of the parasitic voltage drops
in the inductor discharge path, including synchronous
rectifier, inductor, and PC board resistances. V DROP2 is
where V SET = 1V (see the Electrical Characteristics )
and V OUT can range from V SET to 18V.
For output voltages below 1V, set the MAX1875/
MAX1876 output voltage by connecting a voltage-
divider from the output to FB_ to REF (Figure 6). Select
R_C (FB to REF resistor) in the 1k ? to 10k ? range.
Calculate R_A with the following equation:
? V   V ?
? V REF - V SET ?
where V SET = 1V, V REF = 2V (see the Electrical
Characteristics ), and V OUT can range from 0 to V SET .
MAX1875
MAX1875
MAX1875
OSC
CK0
SYNC
OSC
CK0
SYNC
OSC
SYNC
SYNC
MASTER
180 ° PHASE SHIFT
DH1
MASTER
DH2
DH1
SLAVE
DH2
V L
2-PHASE SYSTEM
SLAVE
MASTER
90 ° PHASE SHIFT
DH1
MASTER
DH2
DH1
SLAVE
DH2
V L
4-PHASE SYSTEM
SLAVE
Figure 5. Synchronized Controllers
12
______________________________________________________________________________________
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相关代理商/技术参数
参数描述
MAX1875EEG+ 功能描述:电压模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1875EEG+T 功能描述:电压模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1875EEG-T 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
MAX1875EVKIT 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1875 MAX1876 MAX1858 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
MAX1876AEEG 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK