Philips Semiconductors
High efficiency DC/DC converter
Product specification
TEA1208T
FEATURES
• Fully integrated DC/DC converter circuit
• Up-or-down conversion
• Start-up from 1.85 V input voltage
• Adjustable output voltage
• High efficiency over a wide range of loads
• Power handling capability up to 0.42 A continuous
average current
• 275 kHz switching frequency
• Low quiescent power consumption
• External clock synchronization
• True current limit for Li-ion battery compatibility
• Up to 100% duty cycle in down conversion
• Undervoltage lockout
• Shut-down function
• 8-pin SO package.
APPLICATIONS
• Cellular and cordless phones, Personal Digital
Assistants (PDAs) and others
• Supply voltage source for low-voltage chip sets
• Portable computers
• Battery backup supplies
• Cameras.
GENERAL DESCRIPTION
The TEA1208T is a fully integrated DC/DC converter.
Efficient, compact and dynamic power conversion is
achieved using special digital control concepts - Pulse
Width Modulation (PWM) and Pulse Frequency
Modulation (PFM), integrated low RDSon CMOS power
switches with low parasitic capacitances, and fully
synchronous rectification.
The device operates at a switching frequency of 275 kHz
requiring only minimum sized external components.
Deadlock is prevented by an on-chip undervoltage lockout
circuit.
Efficient behaviour during short load peaks and
compatibility with Li-ion batteries is guaranteed by an
accurate current limiting function.
ORDERING INFORMATION
TYPE NUMBER
TEA1208T
NAME
SO8
PACKAGE
DESCRIPTION
plastic small outline package; 8 leads; body width 3.9 mm
VERSION
SOT96-1
2002 Nov 15
2