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参数资料
| 型号： | MAX1858EEG+ |
| 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： | 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： | 管件 |
Dual 180° Out-of-Phase PWM Step-Down
Controller with Power Sequencing and POR
where t ON(MIN) is 100ns. The minimum input voltage is
V IN ( MIN ) = ? OUT DROP 1 ? + V DROP 2 - V DROP 1
? ? 1- f SW OFF ( MIN ) ? ?
-I PEAK
I LOAD
I LIMIT
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 recti-
fier, inductor, and PC board resistances. V DROP2 is the
sum of the resistances in the charging path, including
high-side switch, inductor, and PC board resistances.
0
TIME
Setting the Output Voltage
R _ A = R _ B ? ? OUT ? -1 ?
Figure 4. “Valley” Current-Limit Threshold Point
Design Procedure
Effective Input Voltage Range
Although, the MAX1858 controller can operate from
input supplies ranging from 4.75V to 23V, the input volt-
age range can be effectively limited by the MAX1858 ’ s
duty-cycle limitations. The maximum input voltage is
limited by the minimum on-time (t ON(MIN) ):
For 1V or greater output voltages, set the MAX1858 out-
put 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:
? ?
? ? V ? ?
? ? V SET ? ?
where V SET = 1.00V (see the Electrical Characteristics )
and V OUT can range from V SET to 18V.
V IN ( MAX ) ≤
V OUT
t ON ( MIN ) f SW
MAX1858
MAX1858
MAX1858
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 |
|---|---|
| MAX1858EEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858EEG+T | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858EEG-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 |
| MAX1858EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1858 MAX1875 MAX1876 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 |
| MAX185ACNG | 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 |
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