Description
Laptop Chip MAXIM MAX1858EEG Dual 180°Out-of-Phase PWM Step-Down Controller
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 controller can be synchronized to an external
clock generated 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 additional 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 conditions 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 outputs reach regulation.
The MAX1858 is available in a 24-pin QSOP package.An evaluation kit is available
to speed designs.
Features:
- Two Independent Output
Voltages
- 180° Out-of-Phase
Operation
- 90° Out-of-Phase
Operation (Using Two MAX1858s)
- Foldback Current Limit
- 4.75V to 23V Input Supply Range
- 0 to 18V Output-Voltage Range (Up to 10A)
- >90% Efficiency
- Fixed-Frequency
Pulse-Width Modulation (PWM) Operation
- Adjustable 100kHz to
600kHz Switching Frequency
- External SYNC Input
- Clock Output for
Master/Slave Synchronization
- Power-On/-Off
Sequencing with Soft-Start and Soft-Stop
- RST Output with 140ms
Minimum Delay
- Lossless Current Limit
(No Sense Resistor)
Applications:
- Network Power Supplies
- Telecom Power Supplies
- DSP, ASIC, and FPGA
Power Supplies
- Set-Top Boxes
- Broadband Routers
- Servers
Package
include:
1 x MAXIM MAX1858EEG Dual 180°Out-of-Phase PWM Step-Down Controller
Additional Information
- Model: MAX1858EEG
- Shipping Weight: 0.3kg
- 24 Units in Stock
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This product was added to our catalog on Tuesday 01 March, 2011.
