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MAX1678

Maxim
Part Number MAX1678
Manufacturer Maxim
Description 1-Cell to 2-Cell / Low-Noise / High-Efficiency / Step-Up DC-DC Converter
Published May 6, 2005
Detailed Description 19-1381; Rev 0; 7/98 KIT ATION EVALU E L B AVAILA 1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converte...
Datasheet PDF File MAX1678 PDF File

MAX1678
MAX1678

Overview
19-1381; Rev 0; 7/98 KIT ATION EVALU E L B AVAILA 1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter General Description Features o 0.
87V Guaranteed Start-Up o Up to 90% Efficiency o Built-In Synchronous Rectifier (no external diode) o Ultra-Small µMAX Package, 1.
1mm High o 37µA Quiescent Current (85µA from 1.
5V battery) o 2µA Logic-Controlled Shutdown o Power-Fail Detector o Dual Mode™ Output: Fixed 3.
3V Adjustable 2V to 5.
5V o 45mA Output Current at 3.
3V for 1-Cell Input o 90mA Output Current at 3.
3V for 2-Cell Input o Inductor-Damping Switch Suppresses EMI MAX1678 The MAX1678 is a high-efficiency, low-voltage, synchronous-rectified, step-up DC-DC converter intended for use in devices powered by 1 to 3-cell alkaline, NiMH, or NiCd batteries or a 1-cell lithium battery.
It guarantees a 0.
87V start-up voltage and features a low 37µA quiescent supply current.
The device includes a 1Ω, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry, and circuitry to reduce inductor ringing—all in an ultra-small, 1.
1mm-high µMAX package.
The output voltage is preset to 3.
3V or can be adjusted from +2V to +5.
5V using only two resistors.
Efficiencies up to 90% are achieved for loads up to 50mA.
The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2µA shutdown mode.
Applications Pagers Remote Controls Pointing Devices Personal Medical Monitors Single-Cell Battery-Powered Devices PART MAX1678EUA Ordering Information TEMP.
RANGE -40°C to +85°C PIN-PACKAGE 8 µMAX Note: To order these devices shipped in tape-and-reel, add a -T to the part number.
Typical Operating Circuit Pin Configuration INPUT 0.
87V TO VOUT LX OUT OUTPUT 3.
3V TOP VIEW MAX1678 BATT ON OFF LOW-BATTERY DETECTOR INPUT SHDN PFI GND PFO FB LOW-BATTERY DETECTOR OUTPUT BATT PFI PFO SHDN 1 2 3 4 8 OUT LX GND FB MAX1678 7 6 5 µMAX Dual Mode is a trademark...


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