MAX1705

1 to 3 Cell, High Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator

Low-Noise, Dual-Output Converter Powers PA and Radio Baseband and Logic In Cellular Phones


Please check latest availability status for a specific part variant.

Description

The MAX1705/MAX1706 are high-efficiency, low-noise, step-up DC-DC converters with an auxiliary linear-regulator output. These devices are intended for use in battery-powered wireless applications. They use a synchronous rectifier pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs, such as 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell. The MAX1705 has an internal 1A n-channel MOSFET switch. The MAX1706 has a 0.5A switch. Both devices also have a built-in low-dropout linear regulator that delivers up to 200mA.

With an internal synchronous rectifier, the MAX1705/MAX1706 deliver 5% better efficiency than similar non-synchronous converters. They also feature a pulse-frequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 1µA shutdown mode. An efficiency-enhancing track mode reduces the step-up DC-DC converter output to 300mV above the linear-regulator output.

Both devices come in a 16-pin QSOP package, which occupies the same space as an 8-pin SO. Other features include two shutdown-control inputs for push-on/push-off control, and an uncommitted comparator for use as a voltage monitor.

Key Features

  • Up to 96% Efficiency
  • 1.1VIN Guaranteed Startup
  • Up to 850mA Output (MAX1705)
  • Step-Up Output (2.5V to 5.5V Adjustable)
  • Linear Regulator (1.25V to 5.0V Adjustable)
  • PWM/PFM Synchronous-Rectified Topology
  • 300kHz PWM Mode or Synchronizable
  • 1µA Shutdown Mode
  • Voltage Monitor
  • Pushbutton On/Off Control

Applications/Uses

  • Digital Cordless Phones
  • Handheld Instruments (PDAs, Palmtops)
  • Palmtop Computers
  • PCS Phones
  • Personal Communicators
  • Two-Way Paging
  • Wireless Handsets

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


Part NumberICC
(mA)
Shutdown Mode Supply Current
(µA)
Shutdown Mode Supply Current
(µA)
Package/PinsBudgetary
Price
typtypmaxSee Notes
MAX1705 0.1120
See Data Sheet
-
MAX1706 
See Data Sheet
$3.11 @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.

See parametric specs for Step-Down/Up Switching Regulators (30)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
IOUT1
(A)
Output Adjust. MethodSwitch TypeSynchronous SwitchingPower Good SignalICC
(mA)
DC-DC OutputsAlternate TopologyLDO/ Op.Amp. OutputsOper. Freq.
(kHz)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
minmaxminmaxmaxmaxmaxSee Notes
MAX1705 0.75.52.55.50.80.8ResistorInternalYesYes0.191
Step-Up
Step-Up/Down
1400
QSOP/16
-40 to +85$3.88 @1k
MAX1706 0.40.4
QSOP/16
$3.11 @1k

MAX1705EVKIT: Evaluation Kit for the MAX1705, MAX1706
MAX1706EVKIT: Evaluation Kit for the MAX1705, MAX1706
Request Reliability Report for: MAX1705 
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.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

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