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Электронный компонент: AIC1573CS

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AIC1573
5-bit DAC, Synchronous PWM Power
Regulator with Simple PWM Power Regulator,
LDO And Linear Controller
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-1573-01 Sep 10, 01
TEL: 886-3-5772500 FAX: 886-3-5772510
1
n
FEATURES
l
Compatible with HIP6020.
l
Provides 4 Regulated Voltages for Microprocessor
Core, AGP Bus, Memory and GTL Bus Power.
l
TTL Compatible 5-bit Digital-to-Analog Core Output
Voltage Selection. Range from 1.3V to 3.5V.
0.1V Steps from 2.1V to 3.5V.
0.05V Steps from 1.3V to 2.05V.
l
1.0% PWM Output Voltage for VCORE.
l
3% PWM Output Voltage for AGP Bus.
l
3.0% Reference Voltage for Chipset and/or Ca-
che Memory and VGTL.
l
Simple Voltage-Mode PWM Control with Built in
Internal Compensation Networks.
l
N-Channel MOSFET Driver for PWM buck con-
verters.
l
Linear Controller Drives Compatible with both N
Chanel MOSFET and NPN Bipolar Series Pass
Transistor.
l
Operates from +3.3V, +5V and +12V Inputs.
l
Fast Transient Response.
l
Full 0% to 100% Duty Ratios.
l
Adjustable Current Limit without External Sense
Resistor.
l
Microprocessor Core Voltage Protection against
Upper MOSFET shorted to +5V.
l
Power Good Output Voltage Monitor.
l
Over-Voltage and Over-Current Fault Monitors.
l
200KHz Free-Running Oscillator Programmable up
to 700KHz.
n
APPLICATIONS
l
Full Motherboard Power Regulation for Computers.
n
DESCRIPTION
The AIC1573 combines two PWM voltage mode
controllers and two linear controllers as well as the
monitoring and protection functions in this chip. One
PWM controller regulates the microprocessor core
voltage with a synchronous rectified buck converter.
The second PWM controller provides AGP bus 1.5V
or 3.3V power with a standard buck converter. Two
linear controllers regulate power for the 1.5V GTL
bus and 1.8V power for the chip set core voltage
and/or cache memory circuits.
An integrated 5 bit D/A converter that adjusts the
microprocessor core voltage from 2.1V to 3.5V in
0.1V increments and from 1.3V to 2.05V in 0.05V
increments. The second PWM controller for AGP
bus power is selectable by means of SELECT pin
status for 1.5V or 3.3V with 3% accuracy. Two linear
controllers drive with external N-channel MOSFETs
to provide 1.5V3% and fixed output voltage
1.8V3%.
This chip monitors all the output voltages. Power
Good signal is issued when the core voltage is
within 10% of the DAC setting and the other levels
are above their under-voltage levels. Over-voltage
protection for the core output uses the lower N-
channel MOSFET to prevent output voltage above
116% of the DAC setting.
The PWM over-current function monitors the output
current by using the voltage drop across the upper
MOSFET's R
DS(ON)
,
eliminating the need for a cur-
rent sensing resistor
.
AIC1573
2
n
APPLICATION CIRCUIT
+
+
+
+
+
+
UGATE1
UGATE2
PHASE1
PHASE2
LGATE1
PGND
VSEN2
FB1
SELECT
NC
VAUX
VSEN1
DRIVE3
VID0
VSEN3
VID1
VID2
VID3
VID4
PGOOD
DRIVE4
FAULT/RT
VESN4
SS
7
H
3
H
4.7
F
8
13
7
6
5
4
3
1nF
1nF
C7
C5
1000
F*3
1000
F*7
20
0.22
F
C6
680K
10K
R2
R1
10V
680
F*7
C
IN
R3
L1
V
OUT1
21
L3
22
C
OUT1
OCSET1
23
24
25
26
27
GND
+5V
IN
1
H
Q2
Q1
9
3.3V or 1.5V
V
OUT2
Q5
Q4
Q3
C
OUT3
C
OUT4
C
OUT2
14
Css
GND
1.8V
V
OUT4
15
11
16
V
OUT3
19
18
1.5V
+3.3V
IN
28
1
+12V
IN
OCSET2
L2
10
2
VCC
17
12
AIC1573
3
n
ORDERING INFORMATION
ORDER NUMBER
PIN CONFIGURATION
AIC1573-CX
AIC157 3CS
(SO28)
PACKAGING TYPE
S: SMALL OUTLINE
1
3
4
2
5
7
6
8
9
10
VID 1
PHASE2
VID 4
VID 3
UGATE2
VID 2
VSEN2
VID0
OCSET2
PGOOD
11
12
SS
SELECT
PHASE1
V C C
UGATE1
OCSET1
LGATE1
PGND
20
19
VSEN1
VSEN3
FB1
NC
28
26
27
25
24
23
21
22
18
17 GND
DRIVE3
13
14
VSEN4
FAULT/RT
16
15 DRIVE4
VAUX
n
ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VCC .................. ... ... ... ... ........ ... ... ... ............ ..... ... ..................... +15V

PGOOD, FAULT and GATE Voltage ........ ... ... ........ ... ... ..... .... GND -0.3V to V
CC
+0.3V

Input, Output , or I/O Voltage ......... ...... ... ... ... ... ... ... ... ... ..... ... ............ GND -0.3V to 7V

Recommended Operating Conditions

Supply Voltage; VCC... ... ..... ... ... ... .............. ................... +12V10%

Ambient Temperature Range ... ... ..... ... ..... ... ... ................. 0
C~70
C

Junction Temperature Range ... ... ....... .... ... ... .................. 0
C~125
C

Thermal Information

Thermal Resistance,
JA

SOIC package ... ... ... ... ... ... ... ... ... ... ... ... ... ..... ..... .............. 70
C/W

SOIC package (with 3in
2
of copper) ... ...... ..... ... .......... ......... 50
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
AIC1573
4
n
ELECTRICAL CHARACTERISTICS
(Vcc=12V, TA=25
C, Unless otherwise specified)

PARAMETER

TEST CONDITIONS

SYMBOL

MIN.

TYP.

MAX.

UNIT

VCC SUPPLY CURRENT

Supply Current

UGATE1, LGATE1, UGATE2,
DRIVE3 and DRIVE4 open

I
CC

3

mA

POWER ON RESET

Rising VCC Threshold

VOCSET=4.5V

V
CCTHR

10.4

V

Falling VCC Threshold

VOCSET=4.5V

V
CCTHF

8.2

V

Rising VAUX Threshold

VAUX
THR

2.5

V

VAUX Threshold Hysteresis

VAUX
HYS


500


mV

Rising VOCSET1 Threshold

V
OCSETH

1.26

V

OSCILLATOR

Free Running Frequency

RT=Open

F

170

200

230

KHz

Total Variation

6k
<RT to GND<200k

-15

+15

%

Ramp. Amplitude

RT=open
V
OSC

1.5

VP-P

DAC AND STANDARD BUCK REGULATOR REFERENCE

DAC (VID0~VID4) Input Low
Voltage

V
IDL

0.8

V

DAC (VID0~VID4) Input High
Voltage

V
IDH

2.0

V

DACOUT Voltage Accuracy

V
DAC
=1.8V~3.5V

-1.0

+1.0

%

PWM2 Reference Voltage

Select < 0.8V

1.5

V

PWM2 Reference Voltage

Select > 2.0V

3.3

V

PWM2 Reference Voltage
Tolerance

3

%

1.5V AND 1.8V LINEAR REGULATORS ( OUT3, OUT4)

Regulation

3

%

VSEN3 Regulation Voltage

V
REG3

1.5

V

VSEN4 Regulation Voltage

V
REG4

1.8

V

Under-Voltage Level
( V
SEN
/V
REG
)

V
SEN
Rising

V
SENUV

75

%

Under-Voltage Hysteresis
(V
SEN
/V
REG
)

V
SEN
Falling

5

%

Output Drive Current ( All
Linears )

V
AUX
-V
DRIVE
> 0.6V

20

30

mA
AIC1573
5
n
ELECTRICAL CHARACTERISTICS
(Continued)

PARAMETER

TEST CONDITIONS

SYMBOL MIN.

TYP.

MAX.

UNIT

SYNCHRONOUS PWM CONTROLLER AMPLIFIER

DC Gain

(G.B.D.)

80

dB

Gain-Bandwidth Product

(G.B.D.)

G
BWP

13

MHz

Slew Rate

(G.B.D.) note 1.

S
R

6

V/
s

PWM CONTROLLER GATE DRIVERS

U
GATE1,2
Upper Drive Source

V
CC
=12V, V
U
GATE
= 6V

I
UGH

0.9

A

U
GATE1,2
Upper Drive Sink

V
UGATE
=1V

R
UGL

2.8

3.5

Lower Drive Source

V
CC
=12V, V
LGATE
=1V

I
LGH

1

A

Lower Drive Sink

V
LGATE
=1V

R
LGL

2.2

3.0

PROTECTION

VSEN1 Over-Voltage
( V
SEN1
/DACOUT)

V
SEN1
Rising

OVP

116

120

%

FAULT Sourcing Current

V
CC
-
V
FAULT/RT
=2.0V

I
OVP

20

mA

OCSET1,2 Current Source

V
OCSET
=4.5VDC

I
OCSET

170

200

230
A

Soft-Start Current

I
SS

25
A

POWER GOOD

V
SEN1
Upper Threshold

( V
SEN1
/DACOUT )

V
SEN1
Rising

108

111

%

V
SEN1
Under-Voltage

( VSEN1/DACOUT )

V
SEN1
Falling

92

95

%

V
SEN1
Hysteresis
(VSEN1/DACOUT)

Upper and Lower Threshold

2

%

P
GOOD
Voltage Low

I
PGOOD
=-4mA

V
PGOOD

0.4

0.8

V

Note 1. Without internal compensation network, the gain bandwidth product is 13MHz. Being associated with
internal compensation networks, the Bode Plot is shown in Fig. 3, "Internal Compensation Gain of
PWM Error Amplifier".