Features: ` Up to 96% Efficiency
` 1.1 VIN Guaranteed Start-Up
` 0.7V to 5.5V Input Range
` Up to 800mA Output
` Step-Up Output (adjustable from 2.5V to 5.5V)
` PWM/PFM Synchronous-Rectified Topology
` External Clock or Internal 300kHz Oscillator
` 3A Logic-Controlled Shutdown
` Power-Good Output (MAX1701)
` Low-Battery Comparator (MAX1701)
` Uncommitted Gain Block (MAX1701)Application· Digital Cordless
· Phones Personal Communicators
· PCS Phones
· Palmtop Computers
· Wireless Handsets
· Hand-Held Instruments
· Two-Way PagersPinout
SpecificationsONA, ONB, OUT, AO, POK, LBO to GND...................-0.3V, +6V
PGND to GND.................................................................±0.3V
LX to PGND.................................................-0.3V,VPOUT+0.3V
CLK/SEL, AIN, REF, FB, LBP, LBN, POUT to GND...............-0.3V,
VOUT+0.3V .............................................................................
Continuous Power Dissipation (TA=+70°C)
16-QSOP (Derate 8.30mW/°C above +70°C) .............667mW
Operating Temperature Ranges
MAX1700EEE, MAX1701EEE ...........................-40°C to +85°C
Junction Temperature..................................................+150°C
Storage Temperature Range ........................-65°C to +160°C
Lead Temperature (soldering, 10sec) ..........................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX1700/MAX1701 are high-efficiency, low-noise, step-up DC-DC converters intended for use in batterypowered wireless applications. They use a synchronous- rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs such as one to three NiCd/NiMH cells or one Li- Ion cell. Both devices have an internal 1A, 130m Nchannel MOSFET switch and a 250m P-channel synchronous rectifier.
With their internal synchronous rectifier, the MAX1700/MAX1701 deliver 5% better efficiency than similar nonsynchronous converters. They also feature a pulsefrequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 3A shutdown mode.
The MAX1700/MAX1701 come in 16-pin QSOP packages (which occupy the same space as an 8-pin SO). The MAX1701 includes two comparators to generate power-good and low-battery warning outputs. It also contains a gain block that can be used to build a linear regulator using an external P-channel pass device.
For higher-power outputs, refer to the MAX1703. For dual outputs (step-up and linear regulator), refer to the MAX1705/MAX1706. For an on-board analog-to-digital converter, refer to the MAX848/MAX849.
The MAX1701 evaluation kit is available to speed design time.
MAX1701 Data Sheet
