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MFG:MAXIM
Part Number: MAX859
MFG: MAXIM
Description: The MAX856MAX859 are high-efficiency, CMOS, step- up, DC-DC switching regulators for small, low input ...
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MAX859
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DataSheet
General Description
MAX859 General Description
The MAX856MAX859 are high-efficiency, CMOS, step- up, DC-DC switching regulators for small, low input volt- age or battery-powered systems. The MAX856/MAX858 accept a positive input voltage between 0.8V and VOUT and convert it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX857/MAX859 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiencies are greater than 85%. Typical quies- cent supply current is 25A (1A in shutdown).
The MAX856MAX859 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. The MAX856/MAX857 have a 500mA peak inductor current limit. The MAX858/MAX859 have a 125mA peak inductor current limit.
MAX859 Maximum Ratings
Supply Voltage (OUT to GND) .....................................-0.3V, +7V
Switch Voltage (LX to GND) ........................................-0.3V, +7V
SHDN , LBO to GND.....................................................-0.3V, +7V
LBI, REF, 3/5, FB to GND .............................-0.3V, (VOUT + 0.3V)
Reference Current (IREF) ..................................................2.5mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
MAX (derate 4.1mW/°C above +70°C) .......................330mW
CERDIP (derate 8.00mW/°C above +70°C) ..................640mW
Reverse Battery Current (TA +45°C, Note 1)...................750mA
Operating Temperature Ranges
MAX85_C_ _ .......................................................0°C to +70°C
MAX85_E_ _ .....................................................-40°C to +85°C
MAX85_MJA ....................................................-55°C to +125°C
Junction Temperature ....................................................+150°C
Storage Temperature Range ..........................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
MAX859 Features
0.8V to 6.0V Input Supply Voltage
0.8V Typ Start-Up Supply Voltage
85% Efficiency at 100mA
25A Quiescent Current
1A Shutdown Mode
125mA and 500mA Switch-Current Limits Permit
Use of Low-Cost Inductors
Up to 500kHz Switching Frequency
±1.5% Reference Tolerance Over Temperature
Low-Battery Detector (LBI/LBO)
8-Pin SO and MAX Packages
0.8V Typ Start-Up Supply Voltage
85% Efficiency at 100mA
25A Quiescent Current
1A Shutdown Mode
125mA and 500mA Switch-Current Limits Permit
Use of Low-Cost Inductors
Up to 500kHz Switching Frequency
±1.5% Reference Tolerance Over Temperature
Low-Battery Detector (LBI/LBO)
8-Pin SO and MAX Packages
MAX859 Typical Application
3.3V to 5V Step-Up Conversion
Palmtop Computers
Portable Data-Collection Equipment
Personal Data Communicators/Computers
Medical Instrumentation
2-Cell & 3-Cell Battery-Operated Equipment
Glucose Meters
Palmtop Computers
Portable Data-Collection Equipment
Personal Data Communicators/Computers
Medical Instrumentation
2-Cell & 3-Cell Battery-Operated Equipment
Glucose Meters
MAX859 Connection Diagram
MAX859
PDF/DataSheet Download
- Datasheet: MAX859
- File Size: 129968 KB
- Manufacturer: Maixm
- Click here to Download
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