AIC AIC1580LCS

AIC1580/L
Simple PWM Power Regulator with Shutdown
FEATURES
Operation Voltage up to 15V.
Simple Voltage-Mode PWM Control.
Fast Transient Response.
DESCRIPTION
The AIC1580 is a high-power, high-efficiency
voltage-mode switching regulator controller for
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.
Low Shutdown Current
Built-in Soft Start.
motherboard VI/O power supply applications.
Designed to drive a N-channel MOSFET in a
standard buck topology, the AIC1580 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 AIC1580 to
adjust the output voltage from 2.0V to 3.5V in
0.1V increments. Table 1 on the following page
APPLICATIONS
specifies the corresponding output voltage for
Power Supply for Motherboard VGTL (1.5V Output)
16 combinations of DAC inputs as in the typical
Power Supply for Motherboard VI/O.
High-Power 5V to 3.xV DC/DC Regulators.
Low-Voltage Distributed Power Supplies.
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.
The AIC1580 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 AIC1580L provides lower reference voltage
(1.30V) than the default (2.00V, AIC1580) for
lower VOUT requirement.
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1580-00
TEL: 886-3-5772500
Sep 5, 00
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1580/L
ORDERING INFORMATION
AIC1580 XXX
AIC1580CN
AIC1580LCN
(PLASTIC DIP)
TEMPERATURE RANGE
C=0°C~+70°C
TOP VIEW
8 VCC
OCSET 1
AIC1580CS
AIC1580LCS
(PLASTIC SO)
REFERENCE VOLTAGE
DEFAULT: 2.00V
L: 1.30V
PIN CONFIGURATION
ORDER NUMBER
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
SD 2
7 UGATE
COMP 3
6 PHASE
FB* 4
5 GND
*AIC1580: 2.00V
AIC1580L: 1.30V
TYPICAL APPLICATION CIRCUIT
C9
*C1 MUST BE VERY CLOSE TO VCC PIN
R1
C1
1000P
10
12V
1U
R2
5V
L1
2.2K
1.5U
AIC1580
M1
CLSET VCC
SD
UDRI
COMPPHASE
FB
GND
C7
IR3303
C6
R6 33P
90.9K
+
C3
3000UF
R9
L2
5K
7U
D1
SRA1620
1000P
VOUT
+
C4
6000UF
R7
VID0
6.04K
VID1
30.1K
VID2
15.0K
R8
R4
R5
3.01K
R3
VID3
7.5K
Switching Regulator for Pentium VCORE Supply
2
AIC1580/L
Table 1. Output Voltage Program
VID3
VID2
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VOUT
2.00V
2.10V
2.20V
2.30V
2.40V
2.50V
2.60V
2.70V
2.80V
2.90V
3.00V
3.10V
3.20V
3.30V
3.40V
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, VCC ....…......................………….......……….................................. 12V ±10%
Ambient Temperature Range .…................................………….……….................. 0°C~70°C
Junction Temperature Range ....…............……….........…..……......................... 0°C~ 100°C
Thermal Information
Thermal Resistance, θJA (Typical, Note 1)
SOIC Package ...............................………………………..……………........…. 100°C/W
SOIC Package (with 3 in2 of Copper) ……………………………………......….. 90°C/W
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: θJA is measured with the component mounted on an evaluation PC board in free air.
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
3
AIC1580/L
ELECTRICAL CHARACTERISTICS
specified.)
PARAMETER
TEST CONDITIONS
(VCC= 12V, Ta=25°°C, unless otherwise
SYMBOL
MIN.
TYP.
MAX.
UNIT
VCC Supply Current
Nominal Supply
UGATE Open
IVCC
2
mA
9.5
V
Frequency
200
KHz
Duty Cycle
88
%
Power-On Reset
VCC Threshold
VOCSET=4.5V
Oscillator
Internal Reference Voltage
Reference Voltage
AIC1580
AIC1580L
1.96
1.27
2.00
1.30
2.04
1.33
V
Error Amplifier
DC Gain
76
dB
GBW
11
MHz
SR
6
V/µS
Upper Gate Source
RUGATE
7
Ω
Upper Gate Sink
RUGATE
5
Ω
IOCSET
200
µA
ISS
10
µA
Gain-Bandwidth Product
Slew Rate
Comp=10pF
Gate Driver
Protection
OCSET Current Source
SS Current
VOCSET =4.5VDC
Shutdown
Shutdown Low Input
VINL
Shutdown High Input
VINH
Shutdown Mode Current
0.35
2
V
V
1
µA
4
AIC1580/L
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs. Load Current
OCSET Current vs. Temperature
100
Vo=1.3V
90
80
200
Vo=2.0V
Clset (µA)
Efficiency (%)
70
Vo=3.5V
60
50
198
Tc=134ppm/ [email protected] 0~100°C
196
194
40
192
30
1
2
3
4
5
6
IOUT (A)
7
8
Over-Current Operation
9
10
11
-40
-20
0
20
40
60
80
100
Temperature (°C)
120
140
160
Output Clamped by Built-In Soft Start
Transient Response
5
AIC1580/L
BLOCK DIAGRAM
Over Current
-
PHASE
+
SD
OCSET
200µA
Power-On
Reset
Built-In Soft Start
REF
+
Error AMP
VCC
PWM Comparator
+
Gate Control
-
UGATE
FB
GND
COMP
Oscilator
PIN DESCRIPTIONS
PIN 1: OCSET - Current limit sense pin. Connect
a resistor ROCSET from this pin to
the drain of the external
MOSFET. ROCSET, an internal
200µA current source (IOCSET),
and the external MOSFET onresistance (RDS(ON)) jointly set
the overcurrent
trip
point
according to the following
equation:
IPEAK =
PIN 4: FB -
The error amplifier inverting
input pin. The FB pin and COMP
pin are used to compensate the
voltage-control feedback loop.
PIN 5: GND-
Ground pin.
PIN 6: PHASE-
Overcurrent
detection
pin.
Connect the PHASE pin to
source of the external NMOSFET. This pin detects the
voltage
drop
across
the
MOSFET RDS(ON) for overcurrent
protection.
IOCSET × ROCSET
RDS(ON)
If FB pin voltage is sensed to be
below 50% of the internal
voltage reference VDAC, the
overcurrent comparator cycles
the soft-start function.
PIN 2: SD
connected to FB pin to
compensate the voltage-control
feedback loop of the converter.
- Shutdown pin. Connect this pin
to ground for shutdown.
PIN 3: COMP - External compensation pin. This
pin is connected to error
amplifier output and PWM
comparator. A RC network is
PIN 7: UGATE- External MOSFET gate drive pin.
Connect this pin to gate of the
external MOSFET.
PIN 8: VCC
-The chip power supply pin.
Recommended supply voltage is
12V.
6
AIC1580/L
APPLICATION CIRCUIT
C9
R1
1000P
CLSET
SD
33P
C7
R6
PHASE
R9
GND
3000µF
L2
R5
13K
2K
VOUT
7µF
D1
SRA1620
R7
C3
IR3303
5K
1000P
5V
1.5µF
M1
AIC1580
C6
90.9K
1.5V/10A
+
C4
6000µF
PHYSICAL DIMENSIONS
8 LEAD PLASTIC SO (unit: mm)
D
H
E
e
C
B
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
e
A
A1
FB
L1
+
VCC
UDRI
COMP
12V
*C1 must be very close
to VCC PIN
2.2K
R2
10
*C1
1µF
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
L
7
AIC1580/L
8 LEAD PLASTIC DIP (unit: mm)
D
E1
E
A2
A1
C
L
eB
b
e
SYMBOL
MIN
MAX
A1
0.381
—
A2
2.92
4.96
b
0.35
0.56
C
0.20
0.36
D
9.01
10.16
E
7.62
8.26
E1
6.09
7.12
e
2.54 (TYP)
eB
—
10.92
L
2.92
3.81
8