AIC1566
4-bit DAC, Simple PWM Power Regulator With
Linear Controller
FEATURES
Switching Regulator and Low Dropout Linear
Regulator on Single Chip.
Simple Voltage-Mode PWM Control.
Fast Transient Response.
±1.5%
4-Bit Digital-to-Analog Output Voltage.
Adjustable Current Limit Without External Sense
Resistors.
Full 0% to 100% Duty Ratio.
200KHz Free-Running Oscillator Programmable
up to 350KHz.
Power-Good Output Voltage Monitor.
Short Circuit Protection with Low Short Circuit
Output Current.
The internal 4-bit Digital-to-Analog Converter
(DAC) adjusts the output voltage from 2.0V to
3.5V in 0.1V increments. The precision reference
and voltage-mode control can provide output
DESCRIPTION
The AIC1566 is a high power, high efficiency
switching regulator controller optimized for high
performance microprocessor applications. It is
designed to drive an N-channel MOSFET in a
standard buck topology.
dropout
linear
regulator
Featuring a low
and
a
digitally
programmable switching regulator, the AIC1566
includes monitoring and protection capabilities in
addition to all the essential PWM control
functions.
APPLICATIONS
Power Supply for Pentium, Pentium Pro, Power
PC, and Alpha Microprocessors.
High-Power 5V to 3.xV DC/DC Regulators.
Low-Voltage Distributed Power Supplies.
regulation within
±1.5%
over temperature and line
voltage shifts.
The internal oscillator of the AIC1566 free runs at
200KHz and can be adjusted up to 350KHz. The
resulting PWM duty ratio ranges from 0% to 100%.
The error amplifier features a 11MHz bandwidth
and 6V/µS slew rate which enables
converter
bandwidth
for
fast
performance.
The AIC1566 provides adjustable over current
and short circuit protections. It senses the output
current across the on resistance of the N-channel
MOSFET without an external low value sense
resistor. It also monitors the output voltage with a
window comparator and issues a power good
signal when the output is within 10% of the rated
output voltage.
high
transient
Analog Integrations Corporation
DS-1566-00
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1566
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
....…..............……………….............................................................
15V
Boot Voltage, V
BOOT
ESD Classification
……….........................……………................................................
15V
.....................................……………..........…….........................
Class 2
Input, Output or I/O Voltage
.....................……………….…….........
GND -0.3V to VCC+0.3V
Recommended Operating Conditions
Supply Voltage
,
V
CC
....….........………………….................................................... 12V
±
10%
Ambient Temperature Range ....…...................................……………................. 0°C ~ 70°C
Junction Temperature Range ....…......................…………………..................... 0°C ~100°C
Thermal Information
Thermal Resistance
,
θ
JA
(Typical, Note 1)
SOIC Package ...............................…………………………………….……….....….
SOIC Package (with 3 in2 of Copper) …………………………..….………………....
Maximum Storage Temperature Range …………………….……......….........
100°C/W
90°C/W
Maximum Junction Temperature (Plastic Package) ………………………................... 150°C
-65°C~150°C
300°C
Maximum Lead Temperature (Soldering 10 sec) ……………………….…....….........
Note 1:
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
ELECTRICAL CHARACTERISTICS
(VCC= 12V, Ta=25°C, unless otherwise
°
specified.)
PARAMETER
VCC Supply Current
Nominal Supply
Power-On Reset
V
CC
Threshold
Rising V
OCSET
Threshold
Reference and DAC
DACOUT Voltage Accuracy
Oscillator
Free Running Frequency
Total Variation
Ramp Amplitude
RT Open
6K≤R
T
≤200KΩ
RT Open
∆V
OSC
170
-20
1.5
200
230
+20
KHz
%
V
P-P
-1.5
+1.5
%
V
OCSET
=4.5V
7
1.26
8.5
V
V
UGATE Open
I
VCC
2
mA
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
3
Test/Measurement
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