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Электронный компонент: AIC1567

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AIC1567
5-bit DAC, Synchronous PWM Power Regulator
with Linear Controller
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-1567-00
TEL: 886-3-5772500
FAX: 886-3-5772510
1
FEATURES
Switching Regulator and Low Dropout Linear
Regulator on single chip.
Simple Voltage-Mode PWM Control.
Dual N-Channel MOSFET Synchronous Drive.
Fast Transient Response.
1.0% 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.
Short Circuit Protection with Low Short Circuit
Output Current.
APPLICATIONS
Power Supply for Pentium II, Power PC and
Alpha Microprocessors.
High-Power 5V to 3.xV DC/DC Regulators.
Low-Voltage Distributed Power Supplies.
DESCRIPTION
The AIC1567 is a high power, high efficiency
switching regulator controller optimized for high
performance microprocessor applications. It is
designed to drive dual N-channel MOSFET in a
standard synchronous buck topology.
Featuring a low dropout linear regulator and a
digitally programmable switching regulator, the
AIC1567 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 control can provide output
regulation within
1.0% over temperature and
line voltage shifts.
The internal oscillator of the AIC1567 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/
S slew rate, which enables
high converter bandwidth for fast transient
response.
AIC1567
2
ORDERING INFORMATION
AIC1567 XX
PACKAGE TYPE
S: SMALL OUTLINE
TEMPERATURE RANGE
C: 0
C~70C
PIN CONFIGURATION
ORDER NUMBER
AIC1567CS
(PLASTIC SO)
TOP VIEW
RT
OVP
VCC
LGATE
PGND
BOOT
UGATE
PHASE
PGOOD
GND
LIDRI
VLFB
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
VSEN
OCSET
SS
VID0
VID1
VID2
VID3
VID4
COMP
FB
CLP
CLN
9
10
11
12
16
15
14
13
TYPICAL APPLICATION CIRCUIT
VSEN
RT
OCSET
OVP
SS
VCC
VID0
LGATE
VID1
PGND
VID2
BOOT
VID3
UGATE
VID4
PHASE
COMP PGOOD
FB
GND
CLP
LIDRI
CLN
VLFB
C2
0.1
F
C1
1
F
C5
1000pF
C7
33pF
C6
1000pF
0.1
F
+
C1
1000
F
5V
137
1%
R3
47K
R5
3.01K
R6
90.9K
R2
2.2K
C8
R1
237
1%
R7
+
1000
F
x 8
R4
15K
D1
1N
5820
M2
N
D
P
6
03A
L
VID0
VID1
VID2
VID3
VID4
V
CORE
V
I/O
3.3V
10A
12V
AIC1567
M3
FD3055
0.1
F
R8
1.2M
C3
1000
F x 3
3
H
L2
M1
R
F
P
4
5N
03L
+
L1
1
H
5V
C4
Pentium
II V
CORE
and V
I/O
DC/DC Converter
AIC1567
3
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 ~ 70C

Junction Temperature Range ...................................................................... 0
C ~100C
Thermal Information

Thermal Resistance,
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~150C

Maximum Lead Temperature (Soldering 10 sec) ................................................ 300
C
Note 1: symbol
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
TEST CONDITIONS
SYMBOL MIN.
TYP.
MAX.
UNIT
VCC Supply Current
Nominal Supply
UGATE Open
I
VCC
2
mA
Power-On Reset
V
CC
Threshold
V
OCSET
=4.5V
7
8.5
V
Rising V
OCSET
Threshold
1.26
V
Oscillator
Free Running Frequency
R
T
Open
170
200
230
KHz
Total Variation
6K
< R
T
<200K
-20
+20
%
Ramp Amplitude
R
T
Open
V
OSC
1.5
V
P-P
AIC1567
4
ELECTRICAL CHARACTERISTICS
(Continued)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Reference and DAC
DACOUT Voltage Accuracy
V
DAC
=1.8V ~3.5V
-1.0
+1.0
%
Error Amplifier
DC Gain
76
dB
Gain-Bandwidth Product
GBW
11
MHz
Slew Rate
SR
6
V/
S
Gate Driver
Upper Gate Source
R
UGATE
8.0
12
Upper Gate Sink
R
UGATE
5.5
10
Lower Gate Source
R
LGATE
8.0
12
Lower Gate Sink
R
LGATE
5.5
10
Protection
Over-Voltage Trip (V
SEN/DACOUT
)
106
115
125
%
OCSET Current Source
V
OCSET
=4.5VDC
I
OCSET
170
200
230
A
OVP Sourcing Current
V
VSEN
=5.5V, V
OVP
=0V
I
OVP
30
mA
Soft Start Current
I
SS
10
A
Soft Start Sink Current under
Current Limit
V
VSEN
=V
DAC
, V
OCSET
=5.0V,
V
PHASE
=0V,
V
FB
=VDAC=50mV
130
A
Soft Start Sink Current under
Hard Current Limit
V
VSEN
=0, V
OCSET
=5.0V,
V
PHASE
=0V, V
FB
=0V
65
mA
Power Good
Upper Threshold (V
VSEN
/V
DAC
) V
VSEN
Rising
106
114
%
Lower Threshold (V
VSEN
/ V
DAC
) V
VSEN
Falling
84
94
%
Hysteresis (V
VSEN
/ V
DAC
)
Upper and Lower Threshold
2
%
PGOOD Voltage Low
I
PGOOD
=5mA
V
PGOOD
0.5
V
Linear Regulator
VLFB Feedback Voltage
1.18
1.21
1.24
V
VLFB Bias Current
40
nA
LIDRI Sourcing Current
10
mA
Current Limiting Threshold
10
20
30
mV
AIC1567
5
BLOCK DIAGRAM
PWM
COMPARATOR
CURRENT SENSE
LINEAR AMP.
ERROR
AMP
CLN
VDAC
1.2V
CLP
COMP
FB
VLFB
LIDRI
OSCILLATOR
REFERENCE
5BITS
DAC
RT
PHASE
OVER
CURRENT
VSEN
OCSET
SOFT
START
200
A
CONTROL
LOGIC
OVP
POWER-ON
RESET
VCC
50%
POWER
GOOD
90%
PGOOD
110%
115%
+
-
VID0
VID3
VID2
VID1
GND
BOOT
UGATE
10
A
4V
SS
+
-
+
-
+
-
+
-
+
+
-
+
-
+
-
+
-
+
-
20mV
VID4
PGND
LGATE
OVP
VCC