Rev.2.1_00
STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL
SWITCHING REGULATOR CONTROLLER
S-8460
Seiko Instruments Inc. 1
The S-8460 is a PWM control CMOS step-up and step-down
switching regulator controller which consists of an automatic-selection
control circuit for step-up and step-down, a reference voltage circuit,
an oscillation circuit, an error amplifier, a phase compensation circuit,
etc. The automatic-selection control circuit for step-up and step-
down in PWM control realizes a high performance step-up and step-
down switching regulator operating on one coil. With an external N-
channel power MOS, the S-8460 is ideal for applications requiring
high efficiency and a high current output.
The S-8460 realizes low ripple, high efficiency and excellent
characteristics by featuring a PWM switching controller that can
change the duty ratio linearly from 0%, and the optimized error
amplifier and phase compensation circuit.
Features
• Single-coil, step-up or step-down switching realizes high efficiency.
• High efficiency is realized by using only N-channel power MOS FET as an external power MOS
• Synchronous rectification at step-down operation
• Input voltage : 2.2 to 18.0 V
• Variable output voltage : Output voltage range 2.5 to 6.0 V
• Automatic-recovery overload protection circuit
• Oscillation frequency : 300 kHz
• Soft-start function set by an external capacitor (C
SS
)
• Shutdown function
• Lead-free products
Applications
• Power supplies for portable equipments such as PDAs, electronic notebooks, cellular phones.
• Main or local power supplies for notebook PCs and peripherals.
• Constant voltage power supplies for cameras, VCRs, and communication devices.
• Available from 2 dry battery cells and 1 lithium cell to AC adapter.
Package
Drawing Code
Package Name
Package Tape Reel
16-Pin TSSOP FT016-A FT016-A FT016-A
