AIC1569A
5-bit DAC, Synchronous PWM Power Regulator
FEATURES
Compatible with HIP6004.
Simple Voltage-Mode PWM Control.
Dual N-Channel MOSFET Synchronous Drive.
Fast Transient Response.
±1%
5-Bit Digital-to-Analog Output Voltage.
Adjustable Current Limit Without External
Sense Resistor.
Full 0% to 100% Duty Ratio.
200KHz
Free-Running
Oscillator,
Programmable up to 350KHz.
Power-Good Output Voltage Monitor.
DESCRIPTION
The AIC1569A is a high power, high efficiency
switching regulator controller optimized for high
performance microprocessor applications. It is
designed to drive dual N-channel MOSFETs in a
standard synchronous buck topology. Featuring
a digitally programmable switching regulator, the
AIC1569A includes monitoring and protection
capabilities in addition to all the essential
synchronous PWM control functions.
The internal 5-bit Digital-to-Analog Converter
(DAC) adjusts the output voltage from 2.0V to
3.5V in 0.1V increments and 1.3V to 2.0V in
0.05V increments. The precision reference and
voltage-mode
voltage shifts.
The internal oscillator of the AIC1569A 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 an 11MHz
bandwidth and 6V/µS slew rate, which enables
high converter bandwidth for fast transient
response.
The AIC1569A provides adjustable over current
and short circuit protections. It senses the output
current across the on resistance of the upper 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.
control
can
provide
output
regulation within
±1%
over temperature and line
APPLICATIONS
Power Supply for Pentium® II, Power® and
Alpha® Microprocessors.
High-Power 5V to 3.xV DC/DC Regulators.
Low-Voltage Distributed Power Supplies.
Analog Integrations Corporation
DS-1569A-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
AIC1569A
ORDERING INFORMATION
AIC1569A XX
PACKAGE TYPE
S: SMALL OUTLINE
TEMPERATURE RANGE
C: 0°C~70°C
ORDER NUMBER
PIN CONFIGURATION
TOP VIEW
VSEN 1
OCSET 2
SS 3
VID0 4
VID1 5
VID2 6
VID3 7
VID4 8
COMP 9
FB 10
20 RT
19 OVP
18 VCC
17 LGATE
16 PGND
15 BOOT
14 UGATE
13 PHASE
12 PGOOD
11 GND
AIC1569ACS
(PLASTIC SO)
TYPICAL APPLICATION CIRCUIT
C9
1000pF
R2
2.2K
C2
C8
0.1µF
VID0
VID1
VID2
VID3
VID4
VSEN
OCSET
SS
VID0
VID1
VID2
VID3
VID4
COMP
FB
C7
33pF
R6
90.9K
C6
1000pF
R7
1.2M
R3
R5
3.01K
47K
C5
0.1µF
RT
OVP
VCC
LGATE
PGND
BOOT
UGATE
PHASE
PGOOD
R1
47Ω
C1
1µF
RFP45N03L
+
0.1µF
12V
L1
1µH
C3
1000µF x 3
5V
M1
L2
3µH
D1
M2
R4
15K
NDP603AL
1N5820
+
V
OUT
GND
AIC1569A
C4
1000µF x 8
DC/DC Converter for Pentium
II V
CORE
2
AIC1569A
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
....…...........................….……....…………..........................................
15V
Boot Voltage, V
BOOT
………........................………..………….............................................
15V
Input, Output, or I/O Voltage
.....................…………...…...…….......
GND - 0.3V to VCC+0.3V
ESD Classification
..............................……………….…................…….........................
Class 2
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...............................………….……..…………………….........….
100°C /W
SOIC Package (with 3 in
2
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)
……….…………………......….........
Note 1:
θ
JA
300°C
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
Oscillator
Free Running Frequency
Total Variation
Ramp Amplitude
RT Open
6KΩ<R
T
<200KΩ
RT Open
∆V
OSC
170
-20
1.5
200
230
+20
KHz
%
V
P-P
V
OCSET
=4.5V
8.2
9.3
1.26
10.2
V
V
UGATE Open
I
VCC
1
3
mA
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX. UNIT
3
AIC1569A
ELECTRICAL CHARACTERISTICS
(Continued)
PARAMETER
DAC Output Voltage
DAC Output Voltage Accuracy
Error Amplifier
DC Gain
Gain-Bandwidth Product
Slew Rate
Gate Driver
Upper Gate Source
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
Protection
Over-Voltage Trip (V
VSEN
/VDAC)
OCSET Current Source
OVP Sourcing Current
SS Current
SS Voltage under Current Limit
V
VSEN
=VDAC,
V
OCSET
=5.0V, V
PHASE
=0V,
V
FB
=VDAC - 50mV
V
VSEN
=0, V
OCSET
=5.0V,
V
PHASE
=0V, V
FB
=0V
V
OCSET
=4.5VDC
V
VSEN
=5.5V, V
OVP
=0V
I
OCSET
I
OVP
I
SS
106
170
30
10
2.0
115
200
125
230
%
µA
mA
µA
V
R
UGATE
R
UGATE
R
LGATE
R
LGATE
5.8
4.4
4.7
3.0
12
10
12
10
Ω
Ω
Ω
Ω
GBW
SR
76
11
6
dB
MHz
V/µS
VDAC=1.3V~3.5V
-1.0
+1.0
%
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX. UNIT
SS Voltage under Hard Current
Limit
Power Good
Upper Threshold (V
VSEN
/VDAC )
Lower Threshold (V
VSEN
/VDAC )
Hysteresis
(V
VSEN
/VDAC )
0.7
V
V
VSEN
Rising
V
VSEN
Falling
Upper and Lower
threshold
I
PGOOD
=5mA
V
PGOOD
106
84
2
0.5
114
94
%
%
%
V
PGOOD Voltage Low
4
AIC1569A
BLOCK DIAGRAM
115%
POWER-ON
RESET
OVP
OVP
VCC
+
−
+
−
110%
VSEN
90%
POWER GOOD
PGOOD
+
−
+
−
50%
10µA
+
−
OVER
CURRENT
I
OCS
200µA
OCSET
SS
PHASE
BOOT
4V
UGATE
SOFT
START
REFERENCE
VDAC
CONTROL
LOGIC
VCC
GND
VID0
VID1
VID2
VID3
VID4
FB
COMP
5-BITS DAC
+
−
ERROR AMP
+
−
PWM
COMPARATOR
LGATE
PGND
OSCILLATOR
RT
PIN DESCRIPTIONS
PIN 1: VSEN - Converter output voltage sense
pin. Connect this pin to the
converter output. The PGOOD
and OVP comparator circuits use
this signal to report output voltage
status and perform overvoltage
protection function.
PIN 2:OCSET - Current limit sense pin. Connect a
resistor R
OCSET
from this pin to the
drain of the external MOSFET.
R
OCSET
, an internal 200µA current
source (I
OCS
), and the external
MOSFET on-resistance (R
DS(ON)
)
jointly set the over current
trip
point according to the following
equation:
I
PEAK
=
I
OCS
×
R
OCSET
R
DS( ON)
If FB pin voltage is sensed to be
below 50% of the internal voltage
reference VDAC, the over current
comparator cycles the soft-start
function.
PIN 3:SS
- Soft start pin. Connect a capacitor
from this pin to ground. An internal
10µA current source provides soft
start function for the converter.
5
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