MAX1875A

Dual 180° Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR


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Description

The MAX1858A/MAX1875A/MAX1876A dual, synchronized, step-down controllers generate two outputs from input supplies ranging from 4.5V 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 by another MAX1858A/MAX1875A/MAX1876A or a system clock. One MAX1858A/MAX1875A/MAX1876A 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 MAX1858A/MAX1875A/MAX1876A feature soft-start. The MAX1858A also features first-on/last-off power sequencing and soft-stop.

The MAX1858A/MAX1875A/MAX1876A eliminate 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 output short-circuit faults without requiring a current-sense resistor. Adjustable foldback current limit reduces power dissipation during short-circuit conditions. The MAX1858A/MAX1876A include a power-on reset (POR) output to signal the system when both outputs reach regulation.

The MAX1858A/MAX1875A/MAX1876A ensure that the output voltage does not swing negative when the input power is removed or when EN is driven low. The MAX1875A/MAX1876A also allow prebias startup without discharging the output.

The MAX1858A/MAX1875A/MAX1876A are available in a 24-pin QSOP package. Use the MAX1875 evaluation kit or the MAX1858 evaluation kit to evaluate the MAX1858A/MAX1875A/MAX1876A.
MAX1858A, MAX1875A, MAX1876A: Functional Diagram MAX1858A, MAX1875A, MAX1876A: Functional Diagram Enlarge+

Key Features

  • 4.5V to 23V Input Supply Range
  • 0 to 18V Output Voltage Range (Up to 10A)
  • Adjustable Lossless Foldback Current Limit
  • Adjustable 100kHz to 600kHz Switching Frequency
  • Optional Synchronization
  • Clock Output for Master/Slave Synchronization
  • 4 x 90° Out-of-Phase Step-Down Converters (Using Two Controllers, Figure 7)
  • Prebias Startup (MAX1875A/MAX1876A)
  • Power Sequencing (MAX1858A)
  • RST-bar Output with 140ms Minimum Delay (MAX1858A/MAX1876A)
  • Fixed-Frequency Pulse-Width Modulation (PWM) Operation

Applications/Uses

  • Broadband Routers
  • Desknote Computers
  • DSP, ASIC, and FPGA Power Supplies
  • Network-Power Supplies
  • Servers
  • Set-Top Boxes
  • Telecom Power Supplies

See parametric specs for Step-Down Switching Regulators (409)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1858A 4.5230.818Resistor10ExternalYes2600
QSOP/24
$3.63 @1k
MAX1876A 
QSOP/24
$3.36 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX1875A 
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Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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