AT1613
Buck Pulse-Width Modulator Controller
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879 Email: service@aimtron.com.tw
Preview the document, detail datasheet contact to our service department.
Features
• Drives N-Channel MOSFETs
• Operates from +5V and +12V input
• Simple Single-Loop Control Design
-Voltage-Mode PWM Control
• Fast Transient Response
-High-Bandwidth Error Amplifier
-Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
- 1.22V Internal Reference
-±1.5% Over Line Voltage and Temperature
• Over-Voltage and Over-Current Fault Monitors
-Does Not Require Extra Current Sensing
Element, Uses MOSFET’s rDS(ON)
• Small Converter Size
-Constant Frequency Operation
-200kHz Free-Running Oscillator
Programmable from 50kHz to over 1MHz
• 14 Pin, SOIC Package
Applications
˙Power supply for PentiumTM, PentiumTM Pro,
PowerPCTM and AlphaTM Microprocessors
˙High-power 5V to 3.xV DC-DC regulators
˙Low-voltage distributed power supplies
General Description
The AT1613 provides complete control and
protection for a DC-DC converter optimized for
high-performance microprocessor applications. It is
designed to drive an N-channel MOSFET in a
standard buck topology. The AT1613 integrates all
of the control, output adjustment, monitoring and
protection functions into a single package.
The output voltage of the converter can be precisely
regulated to as low as 1.22V, with a maximum
tolerance of ±1.5% over temperature and line
voltage variation.
The AT1613 provide simple, single feedback loop,
voltage-mode control with fast transient response. It
includes a 200kHz free-running triangle-wave
oscillator that is adjustable from below 50kHz to
over 1MHz. The error amplifier features a 12MHz
gain-bandwidth product and 6V/μs slew rate which
enables high converter bandwidth for fast transient
performance. The resulting PWM duty ratio ranges
from 0% to 100%.
The AT1613 protects against over-current
conditions by inhibiting PWM operation.The
AT1613 monitors the current by using the rDS
(
on
)
of
the upper MOSFET which eliminates the need for a
current sensing resistor.
AT1613
Buck Pulse-Width Modulator Controller
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879 Email: service@aimtron.com.tw
Preview the document, detail datasheet contact to our service department.
Block Diagram
Pin Configuration
AT1613 (14-Pin SOIC)
