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参数资料
| 型号： | MAX1876EEG+T |
| 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： | 2,500 |
| 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： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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 |
|---|---|
| MAX1876EEG-TG05 | 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 |
| MAX1878EGC | 功能描述:直流/直流开关转换器 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 |
| MAX1878EGC-T | 功能描述:直流/直流开关转换器 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 |
| MAX1878EPD | 制造商:Maxim Integrated Products 功能描述: |
| MAX1878ETC+ | 功能描述:直流/直流开关转换器 Dual-Output Step-Down 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 |
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