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| 型号： | MAX1858EEG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/21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) |
KIT MA
UATION
AVAILA
19-2432; Rev 0; 7/02
NUAL
EVAL BLE
Dual 180° Out-of-Phase PWM Step-Down
Controller with Power Sequencing and POR
General Description
The MAX1858 dual, synchronized, step-down controller
generates two outputs from input supplies ranging from
4.75V to 23V. Each output is adjustable from sub-1V to
18V and supports loads of 10A or higher. Input voltage
ripple and total RMS input ripple current are reduced by
synchronized 180° out-of-phase operation.
The switching frequency is adjustable from 100kHz to
600kHz with an external resistor. Alternatively, the con-
troller can be synchronized to an external clock gener-
ated to another MAX1858 or a system clock. One
MAX1858 can be set to generate an in-phase, or 90°
out-of-phase, clock signal for synchronization with addi-
tional controllers. This allows two controllers to operate
either as an interleaved two- or four-phase system with
each output shifted by 90°. The device also features
“first-on/last-off” power sequencing for compatibility
with DSPs, ASICs, and FPGAs, as well as soft-start and
soft-stop to ensure reliable and repeatable power
sequencing.
The MAX1858 eliminates the need for current-sense
resistors by utilizing the low-side MOSFET’s on-resistance
as a current-sense element. This protects the DC-DC
components from damage during output-overload condi-
tions or when output short-circuit faults without requiring a
current-sense resistor. Adjustable foldback current limit
reduces power dissipation during short-circuit condition.
A power-on reset output signals the system when both
Features
o Two Independent Output Voltages
o 180° Out-of-Phase Operation
o 90° Out-of-Phase Operation
(Using Two MAX1858s)
o Foldback Current Limit
o 4.75V to 23V Input Supply Range
o 0 to 18V Output-Voltage Range (Up to 10A)
o >90% Efficiency
o Fixed-Frequency Pulse-Width Modulation (PWM)
Operation
o Adjustable 100kHz to 600kHz Switching
Frequency
o External SYNC Input
o Clock Output for Master/Slave Synchronization
o Power-On/-Off Sequencing with Soft-Start and
Soft-Stop
o RST Output with 140ms Minimum Delay
o Lossless Current Limit (No Sense Resistor)
Ordering Information
outputs reach regulation.
The MAX1858 is available in a 24-pin QSOP package.
PART
MAX1858EEG
TEMP RANGE
-40 ° C to +85 ° C
PIN-PACKAGE
24 QSOP
An evaluation kit is available to speed designs.
Network Power Supplies
Applications
Pin Configuration
Telecom Power Supplies
DSP, ASIC, and FPGA Power Supplies
Set-Top Boxes
Broadband Routers
Servers
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
COMP2 1
FB2 2
ILIM2 3
OSC 4
V+ 5
REF 6
GND 7
CKO 8
SYNC 9
ILIM1 10
FB1 11
COMP1 12
MAX1858
24 EN
23 DH2
22 LX2
21 BST2
20 DL2
19 V L
18 PGND
17 DL1
16 BST1
15 LX1
14 DH1
13 RST
QSOP
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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| 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 |
| 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 |
| MAX185ACWG | 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 |
| MAX185ACWG+ | 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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