MAX5072

2.2MHz, Dual-Output Buck or Boost Converter with POR and Power-Fail Output


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Description

The MAX5072 is a dual-output DC-DC converter with integrated high-side n-channel power MOSFETs. Each output can be configured either as a buck converter or a boost converter. The MAX5072 is designed to manage the power requirements of xDSL modems. The wide 5.5V to 23V input voltage range allows for the use of inexpensive AC adapters to power the device in xDSL modem applications. Each output is programmable down to 0.8V in the buck mode and up to 28V in the boost mode with an output voltage accuracy of ±1%. In the buck mode, converter 1 and converter 2 can deliver 2A and 1A, respectively. The output switching frequency of each converter can be programmed from 200kHz to 2.2MHz to avoid harmonics in the xDSL frequency band of operation. Each output operates 180° out-of-phase, thus reducing input-capacitor ripple current, size, and cost. A SYNC input facilitates external frequency synchronization. Moreover, a CLKOUT output provides out-of-phase clock signal with respect to converter 2, allowing four-phase operation using two MAX5072 ICs in master-slave configuration.

The MAX5072 includes an internal digital soft-start that reduces inrush current, eliminates output-voltage overshoot, and ensures monotonic rise in output voltage during power-up. The device includes a power-good output and power-on reset as well as manual reset. In addition, each converter output can be shut down individually. The MAX5072 features a "dying gasp" output, which goes low when the input voltage drops below a preprogrammed voltage. Protection features include output short-circuit protection for buck mode and maximum duty-cycle limit for boost operation, as well as thermal shutdown.

The MAX5072 is available in a thermally enhanced 32-pin thin QFN package that can dissipate 2.7W at +70°C ambient temperature. The device is rated for operation over the -40°C to +85°C extended, or -40°C to +125°C automotive operating temperature range.

MAX5072: Pin Configuration MAX5072: Pin Configuration Enlarge+

Key Features

  • 4.5V to 5.5V or 5.5V to 23V Input Supply Voltage Range
  • 0.8V (Buck) to 28V (Boost) Output Voltage
  • Two Independent Output DC-DC Converters with Internal Power MOSFETs
  • Each Output can be Configured in Buck or Boost Mode
  • IOUT1 and IOUT2 of 2A and 1A (Respectively) in Buck Mode
  • 180° Out-of-Phase Operation
  • Clock Output for Four-Phase Operation
  • Switching Frequency Programmable from 200kHz to 2.2MHz
  • Digital Soft-Start and Independent Converter Shutdown
  • SYNC Input, Power-On Reset, Manual Reset, And Power-Fail Output
  • Short-Circuit Protection (Buck)/Maximum Duty-Cycle Limit (Boost)
  • Thermal Shutdown
  • Thermally Enhanced 32-Pin Thin QFN Package Dissipates up to 2.7W at +70°C

Applications/Uses

  • Point-of-Load DC-DC Converters
  • XDSL Modems
  • xDSL Routers

See parametric specs for Step-Down Switching Regulators (404)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Switch TypeOper. Freq.
(kHz)
FeaturesPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX5072 4.5230.8282Internal2200
Adjustable Freq.
Current Limit
Dual/Multi-Phase
External Sync.
Fixed Freq./PWM
Reset Output
TQFN/32
$3.27 @1k

See parametric specs for Step-Up Switching Regulators (101)


Part NumberPackage/PinsBudgetary
Price
See Notes
MAX5072 
TQFN/32
$3.27 @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.

MAX5072EVKIT: Evaluation Kit for the MAX5072
Request Reliability Report for: MAX5072 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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