AIC AIC1579LCS, AIC1579LCN, AIC1579CS, AIC1579 Datasheet
AIC1579/L
Step-Down Switching Regulator Controller
FEATURES
Operation Voltage up to 15V.
Simple Voltage-Mode PWM Control.
Fast Transient Response.
2V and 1.3V ± 2% Feedback Voltage Reference
Option.
Adjustable Current Limit without External Sense
Resistors.
200KHz Free-Running Oscillator.
Short-Circuit Protection with Low Short Circuit
Output Current.
APPLICATIONS
Power Supply for Motherboard V
Power Supply for Motherboard V
High-Power 5V to 3.xV DC/DC Regulators.
Low-Voltage Distributed Power Supplies.
(1.5V Output)
GTL
.
I/O
DESCRIPTION
The AIC1579 is a high-power, high-efficiency
voltage-mode switching regulator controller for
motherboard V
Designed to drive an N-channel MOSFET in a
standard buck topology, the AIC1579 features a
high voltage CMOS output driver, short-circuit
protection, and 8-pin package.
An external 4-bit Digital-to-Analog Converter
(DAC) can be used along with the AIC1579 to
adjust the output voltage from 2.0V to 3.5V in
0.1V increments. Table 1 on the following page
specifies the corresponding output voltage for
16 combinations of DAC inputs as in the typical
application circuit.
The 200KHz switching frequency allows for
using small external components while
maintaining high conversion efficiency. The
11MHz bandwidth and 6V/µS slew rate of the
error amplifier ensures high converter
bandwidth and fast transient response.
power supply applications.
I/O
The AIC1579 provides adjustable overcurrent
and short-circuit protections by sensing the
output current across the on resistance of the
external N-channel MOSFET rather than an
external low value sense resistor.
The AIC1579L provides lower reference voltage
(1.30V) than the default (2.00V, AIC1579) for
lower V
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1579-01 Nov 9, 00 TEL: 886-3-5772500 FAX: 886-3-5772510
requirement.
OUT
1
A
ORDERING INFORMATION
AIC1579 XXX
TYPICAL APPLICATION CIRCUIT
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C=0°C~+70°C
REFERENCE VOLTAGE
DEFAULT: 2.00V
L: 1.30V
C5
0.1µF
C6
33P
R4
60.4K
R5
30.1K
R6
15.0K
R7
7.5K
C7
1000pF
1%
1%
1%
1%
R2
90.9K 1%
VID0
VID1
VID2
VID3
Switching Regulator for Pentium
C2
1000pF
R1
2.2K
OCSET
SS
COMP
FB
1%
UGATE
PHASE
AIC1579
ORDER NUMBER
AIC1579CN
AIC1579LCN
(PLASTIC DIP)
AIC1579CS
AIC1579LCS
(PLASTIC SO)
C1*
1µF
VCC
GND
R3
3.01K
1%
10Ω
R8
PIN CONFIGURATION
TOP VIEW
OCSET
1
2
SS
COMP
3
FB*
4
*AIC1579: 2.00V
IC1579L: 1.30V
*C1 MUST BE VERY CLOSE TO VCC PIN
12V
L1
1µH
M1
RFP45N03L
D1
BYV118
V
CORE
C3
+
1000µFx2
L2
7µH
Supply
AIC1579/L
VCC
8
UGATE
7
PHASE
6
GND
5
5V
3.3V/10A
VOUT
C4
+
1000µ F x 6
2
AIC1579/L
Table 1. Output Voltage Program
VID3 VID2 VID1 VID0 VOUT
1 1 1 1 2.00V
1 1 1 0 2.10V
1 1 0 1 2.20V
1 1 0 0 2.30V
1 0 1 1 2.40V
1 0 1 0 2.50V
1 0 0 1 2.60V
1 0 0 0 2.70V
0 1 1 1 2.80V
0 1 1 0 2.90V
0 1 0 1 3.00V
0 1 0 0 3.10V
0 0 1 1 3.20V
0 0 1 0 3.30V
0 0 0 1 3.40V
0 0 0 0 3.50V
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC....…...………............................…………......................................... 15V
Input, Output, or I/O Voltage ...............………………....……......... GND - 0.3V to VCC+0.3V
ESD Classification .............................………….....……..............……......................... Class 2
Recommended Operating Conditions
Supply Voltage, V
Ambient Temperature Range .…................................………….……….................. 0°C~70°C
Junction Temperature Range ....…............……….........…..……......................... 0°C~ 100°C
Thermal Information
Thermal Resistance, θ
SOIC Package ...............................………………………..……………........…. 100°C/W
SOIC Package (with 3 in
Maximum Junction Temperature (Plastic Package) ……….……..………................... 150°C
Maximum Storage Temperature Range …………..…………......…….…......... –65°C~150°C
Maximum Lead Temperature (Soldering 10 Sec) …………………...……......…......... 300°C
Note 1: θ
is measured with the component mounted on an evaluation PC board in free air.
JA
....…......................………….......……….................................. 12V ±10%
CC
(Typical, Note 1)
JA
2
of Copper) ……………………………………......….. 90°C/W
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
3
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