AIC AIC1567CS

AIC1567
5-bit DAC, Synchronous PWM Power Regulator
with Linear Controller
FEATURES
DESCRIPTION
Switching Regulator and Low Dropout Linear
The AIC1567 is a high power, high efficiency
Regulator on single chip.
switching regulator controller optimized for high
Simple Voltage-Mode PWM Control.
performance microprocessor applications. It is
Dual N-Channel MOSFET Synchronous Drive.
designed to drive dual N-channel MOSFET in a
Fast Transient Response.
standard
±1.0% 5-Bit Digital-to-Analog Output Voltage.
Featuring a low dropout linear regulator and a
Adjustable Current Limit Without External Sense
digitally programmable switching regulator, the
Resistor.
AIC1567 includes monitoring and protection
Full 0% to 100% Duty Ratio.
capabilities in addition to all the essential
200KHz Free-Running Oscillator Programmable
synchronous PWM control functions.
synchronous
buck
topology.
up to 350KHz.
Power-Good Output Voltage Monitor.
The internal 5-bit Digital-to-Analog Converter
Short Circuit Protection with Low Short Circuit
(DAC) adjusts the output voltage from 2.0V to
Output Current.
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
APPLICATIONS
line voltage shifts.
Power Supply for Pentium II, Power PC and
Alpha Microprocessors.
The internal oscillator of the AIC1567 free-runs
High-Power 5V to 3.xV DC/DC Regulators.
at 200KHz and can be adjusted up to 350KHz.
Low-Voltage Distributed Power Supplies.
The resulting PWM duty ratio ranges from 0% to
100%. The error amplifier features a 11MHz
bandwidth and 6V/µS slew rate, which enables
high converter bandwidth for fast transient
response.
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1567-00
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1567
ORDERING INFORMATION
AIC1567 XX
PIN CONFIGURATION
ORDER NUMBER
PACKAGE TYPE
S: SMALL OUTLINE
TOP VIEW
AIC1567CS
(PLASTIC SO)
VSEN 1
TEMPERATURE RANGE
C: 0°C~70°C
24 RT
OCSET 2
23 OVP
SS 3
22 VCC
VID0 4
21 LGATE
VID1 5
20 PGND
VID2 6
19 BOOT
VID3 7
18 UGATE
VID4 8
17 PHASE
COMP 9
16 PGOOD
FB 10
15 GND
CLP 11
14 LIDRI
CLN 12
13 VLFB
TYPICAL APPLICATION CIRCUIT
1000pF
R2
12V
C2
0.1µF
C8
VID1
VID2
VID3
VID4
C7
33pF
VID0
VID1
VID2
VID3
VID4
COMP
FB
CLP
CLN
RT
OVP
VCC
M1
LGATE
PGND
BOOT
UGATE
PHASE
PGOOD
GND
LIDRI
VLFB
C6
90.9K
1000pF
C3
1000µF x 3
3µH
M2
5V
M3
FD3055
AIC1567
R6
+
5V
VCORE
L2
R1
R7
137
1%
237
1%
VI/O
3.3V
10A
+
R5
3.01KΩ
C1
1000µF
R8
1.2M
R4
15K
D1
1N5820
VID0
L1
1µH
NDP603AL
0.1µF
VSEN
OCSET
SS
C1
1µF
RFP45N03L
2.2K
+
C4
1000µF
x8
R3
47K
C5
0.1µF
Pentium II VCORE and VI/O DC/DC Converter
2
AIC1567
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ....…..................................……………........................................... 15V
Boot Voltage, VBOOT ………...................……………...................................................... 15V
Input, Output, or I/O Voltage .....…….........……………......…....... GND - 0.3V
ESD Classification
to
VCC+0.3V
...........................…………......................……......................... 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: symbol θJA 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
IVCC
2
mA
Power-On Reset
VCC Threshold
VOCSET=4.5V
7
Rising VOCSET Threshold
8.5
1.26
V
V
Oscillator
Free Running Frequency
RT Open
170
Total Variation
6KΩ< RT<200KΩ
-20
Ramp Amplitude
RT Open
∆VOSC
200
1.5
230
KHz
+20
%
VP-P
3
AIC1567
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
+1.0
%
Reference and DAC
DACOUT Voltage Accuracy
VDAC=1.8V ~3.5V
-1.0
Error Amplifier
DC Gain
76
dB
GBW
11
MHz
SR
6
V/µS
Upper Gate Source
RUGATE
8.0
12
Ω
Upper Gate Sink
RUGATE
5.5
10
Ω
Lower Gate Source
RLGATE
8.0
12
Ω
Lower Gate Sink
RLGATE
5.5
10
Ω
106
115
125
%
IOCSET
170
200
230
µA
IOVP
30
Gain-Bandwidth Product
Slew Rate
Gate Driver
Protection
Over-Voltage Trip (VSEN/DACOUT)
OCSET Current Source
VOCSET=4.5VDC
OVP Sourcing Current
VVSEN=5.5V, VOVP=0V
Soft Start Current
ISS
Soft Start Sink Current under
VVSEN =VDAC, VOCSET=5.0V,
Current Limit
VPHASE =0V,
mA
10
µA
130
µA
65
mA
VFB=VDAC=50mV
Soft Start Sink Current under
VVSEN =0, VOCSET=5.0V,
Hard Current Limit
VPHASE=0V, VFB=0V
Power Good
Upper Threshold (VVSEN /VDAC ) VVSEN Rising
106
114
%
Lower Threshold (VVSEN / VDAC ) VVSEN Falling
84
94
%
Hysteresis (VVSEN / VDAC )
Upper and Lower Threshold
PGOOD Voltage Low
IPGOOD=5mA
VPGOOD
2
%
0.5
V
Linear Regulator
VLFB Feedback Voltage
1.18
VLFB Bias Current
1.21
1.24
40
LIDRI Sourcing Current
10
Current Limiting Threshold
10
V
nA
mA
20
30
mV
4
AIC1567
BLOCK DIAGRAM
115%
POWER-ON
RESET
+
VCC
OVP
110%
OVP
+
VSEN
90%
+
POWER
GOOD
PGOOD
-
OVER
CURRENT
+
+
-
50%
OCSET
200µA
10µA
SS
4V
PHASE
SOFT
START
BOOT
UGATE
VID0
VID1
VID2
VID3
VID4
VDAC
5BITS
DAC
-
ERROR
AMP
VCC
PWM
COMPARATOR
LGATE
REFERENCE
PGND
OSCILLATOR
FB
RT
COMP
1.2V
LINEAR AMP.
+
CLP
CLN
GND
CONTROL
LOGIC
+
+
+
-
-
+
20mV
-
+
-
CURRENT SENSE
LIDRI
VLFB
5
AIC1567
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
for
overvoltage protection function.
PIN 2: 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 (IOCS), and
the external MOSFET onresistance (RDS(ON)) jointly set
the over current trip point
according to the following
equation:
IPEAK =
IOCS × ROCSET
RDS( 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
PIN 4: VID0
PIN 5: VID1
PIN 6: VID2
PIN 7: VID3
PIN 8: VID4
- Soft start pin. Connect a
capacitor from this pin to ground.
An internal 10µA current source
provides soft start function for
the converter.
- 5-bit DAC voltage select pin. TTL
inputs used to set the internal
voltage reference VDAC. When
left open, these pins are
internally pulled up to 5V and
provide logic ones. The level of
VDAC sets the converter output
voltage as well as the PGOOD
and OVP thresholds.
Table 1 specifies the VDAC
voltage for the 32 combinations
of DAC inputs.
PIN 9: COMP
- External compensation pin. This
pin is connected to error
amplifier output and PWM
comparator. An RC network is
connected to FB pin to
compensate the voltage-control
feedback loop of the converter.
PIN 10: FB
- The error amplifier inverting
input pin. The FB pin and COMP
pin are used to compensate the
voltage-control feedback loop.
PIN 11: CLP
- Linear regulator current sense
pin. This pin is the positive input
of the current sense comparator.
PIN 12: CLN
- Linear regulator current sense
pin. This pin is the negative input
of the current sense comparator.
PIN 13: VLFB - Negative feedback pin for the
linear regulator error amplifier.
PIN 14: LIDRI - Linear regulator output drive pin.
This pin can drive either a
Darlington NPN or an N-channel
MOSFET.
PIN 15: GND
- Signal GND. It also serves as
the power GND for the upper
gate driver.
PIN 16: PGOOD-Power good indicator pin.
PGOOD is an open drain output.
This pin is pulled low when the
converter output is ±10% out of
the VDAC reference voltage.
Table 1. Output Voltage Program
VID4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
VDAC
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
2.6V
2.5V
2.4V
2.3V
2.2V
6
AIC1567
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
to VCORE power by driving N-channel
MOSFET, supply voltage of no higher
than 12V is recommended since the
negative power terminal of the
internal driver is internally tied to
GND.
2.1V
2.0V
2.05V
2.00V
1.95V
1.90V
1.85V
1.80V
1.75V
1.70V
1.65V
1.60V
1.55V
1.50V
1.45V
1.40V
1.35V
1.30V
PIN 20: PGND - Driver power GND pin. PGND should
be connected to a low impedance
ground plane in close to lower NMOSFET source.
PIN 21: LGATE - Lower N-MOSFET gate driver pin.
PIN 17: PHASE - Over current detection pin. Connect
the PHASE pin to source of the
external MOSFET. This pin detects
the voltage drop across the MOSFET
RDS(ON) for over-current protection.
PIN 22: VCC
- The chip power supply pin. It also
serves as power supply for LGATE
driver. Recommended supply voltage
is 12V.
PIN 23: OVP
-Over voltage indicator pin. This pin
also provides a driver source current
to turn on an external SCR in the
event of an over voltage condition.
PIN 24: RT
- Frequency
adjustment
pin.
Connecting a resistor (RT) from this
pin to GND, increase the frequency
by the following equation.
PIN 18: UGATE- External MOSFET gate drive pin.
Connect UGATE to gate of the
external MOSFET.
FS ≅ 200KHz +
5 × 10 5
log RT
PIN 19: BOOT - External MOSFET driver power
supply pin. To convert 5V main power
PHYSICAL DIMENSIONS
24 LEAD PLASTIC SO (300 mil) (unit: mm)
D
E
H
e
B
A
SYMBOL
MIN
MAX
A
2.35
2.65
A1
0.10
0.30
B
0.33
0.51
C
0.23
0.32
D
15.20
15.60
E
7.40
7.60
e
A1
C
L
1.27(TYP)
H
10.00
10.65
L
0.40
1.27
7