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AIC1566
4-bit DAC, Simple PWM Power Regulator With Linear Controller
FEATURES
Switching Regulator and Low Dropout Linear Regulator on Single Chip. Simple Voltage-Mode PWM Control. Fast Transient Response. 1.5% 4-Bit Digital-to-Analog Output Voltage. Adjustable Current Limit Without External Sense Resistors. 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. The internal 4-bit Digital-to-Analog Converter (DAC) adjusts the output voltage from 2.0V to 3.5V in 0.1V increments. The precision reference and voltage-mode control can provide output
DESCRIPTION
The AIC1566 is a high power, high efficiency switching regulator controller optimized for high performance microprocessor applications. It is designed to drive an N-channel MOSFET in a standard buck topology. dropout linear regulator Featuring a low and a digitally
programmable switching regulator, the AIC1566 includes monitoring and protection capabilities in addition to all the essential PWM control functions.
APPLICATIONS
Power Supply for Pentium, Pentium Pro, Power PC, and Alpha Microprocessors. High-Power 5V to 3.xV DC/DC Regulators. Low-Voltage Distributed Power Supplies.
regulation within 1.5% over temperature and line voltage shifts. The internal oscillator of the AIC1566 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 converter bandwidth for fast performance. The AIC1566 provides adjustable over current and short circuit protections. It senses the output current across the on resistance of the 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. high transient
Analog Integrations Corporation DS-1566-00
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
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AIC1566
ORDERING INFORMATION
AIC1566 XX PACKAGE TYPE S: SMALL OUTLINE TEMPERATURE RANGE C: 0C~70C ORDER NUMBER AIC1566CS (PLASTIC SO) PIN CONFIGURATION
TOP VIEW OCSET 1 SS 2 VID0 3 VID1 4 VID2 5 VID3 6 COMP 7 FB 8 CLP 9 CLN 10 20 VSEN 19 RT/OVP 18 VCC 17 BOOT 16 UGATE 15 PHASE 14 PGOOD 13 GND 12 LIDRI 11 VLFB
TYPICAL APPLICATION CIRCUIT
C9 1000pF R2 C8 0.1F 2.2K OCSET VSEN RT/OVP SS VCC VID0 BOOT VID1 UGATE VID2 PHASE VID3 COMP PGOOD FB GND CLP+ LIDRI VLFB CLN C6 1000pF AIC1566 R1 10 12V C2 0.1F C1 1F L1 5V RFP45N03L M1 + 1H C3 1000F x 2 L2 BYV118 D1 7H + C4 1000F x 6 VCORE 10A
C7 33pF R6 90.9K
5V FD3055 VI/O 3.3V 10A + C10 1000F R4 15K
R11 137 1%
R10 237 1% R5 3.01K R12 1.2M
R3 C5 0.1F
47K
Pentium Pro VCORE and VI/O Power Supply
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AIC1566
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .................................................................................................... 15V Boot Voltage, VBOOT ESD Classification ................................................................................................. 15V ............................................................................................. Class 2 Input, Output or I/O Voltage ....................................................... GND -0.3V to VCC+0.3V
Recommended Operating Conditions
Supply Voltage, VCC ......................................................................................... 12V 10% Ambient Temperature Range .......................................................................... 0C ~ 70C Junction Temperature Range ....................................................................... 0C ~100C
Thermal Information Thermal Resistance, JA (Typical, Note 1)
SOIC Package ............................................................................................ SOIC Package (with 3 in2 of Copper) .......................................................... Maximum Storage Temperature Range ................................................. 100C/W 90C/W
Maximum Junction Temperature (Plastic Package) .............................................. 150C -65C~150C 300C Maximum Lead Temperature (Soldering 10 sec) ...............................................
Note 1: 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=25C, unless otherwise
specified.)
PARAMETER VCC Supply Current Nominal Supply Power-On Reset VCC Threshold Rising VOCSET Threshold Reference and DAC DACOUT Voltage Accuracy Oscillator Free Running Frequency Total Variation Ramp Amplitude RT Open 6KRT200K RT Open VOSC 170 -20 1.5 200 230 +20 KHz % VP-P -1.5 +1.5 % VOCSET=4.5V 7 1.26 8.5 V V UGATE Open IVCC 2 mA TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
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AIC1566
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Error Amplifier DC Gain Gain-Bandwidth Product Slew Rate Gate Driver Upper Gate Source Upper Gate Sink Protection Over-Voltage Trip (VVSEN / VVDAC) OCSET Current Source OVP Sourcing Current SS Current SS Sink Current under Current Limit SS Sink Current under Hard Current Limit Power Good Upper Threshold (VVSEN / VDAC) Lower Threshold (VVSEN / VDAC) Hysteresis (VVSEN / VDAC)
PGOOD Voltage Low Linear Regulator VLFB Feedback Voltage VLFB Bias Current LIDRI Sourcing Current CLP, CLN, Current Limiting Threshold 10 10 20 30 Hysteresis (VVSEN/VDAC) 1.18 1.21 40 1.24 V nA mA mV
76 GBW SR 11 6
dB MHz V/S
RUGATE RUGATE
8 5.5
12 10

106 VOCSET=4.5VDC VVSEN =5.5V, VOVP=0V IOCSET IOVP ISS VVSEN=VDAC, VOCSET=5.0V, VPHASE=0V VFB=VDAC-50mA VVSEN =0, VOCSET =5.0V, VPHASE =0V, VFB=0V 170 30
115 200
125 230
% A mA A A
10 130
65
mA
VVSEN Rising VVSEN Falling Upper and Lower Threshold
IPGOOD=5mA VPGOOD
106 84 2
0.5
114 94
% % %
V
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AIC1566
BLOCK DIAGRAM
115%
+
POWER-ON RESET OVP
VCC
110%
+
VSEN 90% 50% 10A
+ +
POWER GOOD
PGOOD
+
OCSET 200A
OVER CURRENT
-
SS 4V PHASE SOFT START BOOT VID0 VID1 VID2 VID3 VDAC 4BITS DAC
+
ERROR AMP
+ +
CONTROL LOGIC PWM COMPARATOR
UGATE
GND
REFERENCE FB COMP OSCILLATOR LINEAR AMP.
+
RT/OVP LIDRI VLFB
1.2V
CLP CLN
-
+
+
CURRENT SENSE AMP.
-
20mV
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AIC1566
PIN DESCRIPTION
PIN 1: OCSET - Current limit sense pin. Connect a resistor ROCSET from this pin to the drain of the external MOSFET. ROCSET, an internal 200A current source (IOCSET), and the external MOSFET onresistance (RDS(ON)) jointly set the over current trip point according to the following equation:
feedback loop.
Table 1. Output Voltage Program
IPEAK =
IOCSET x 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 2: SS - Soft start pin. Connect a capacitor from this pin to ground. An internal 10A current source provides soft start function for the converter.
VID3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
VID2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
VID1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
VID0 0 1 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 2.1V 2.0V
PIN 9: CLP
PIN 3: VID0 PIN 4: VID1 PIN 5: VID2 PIN 6: VID3
- Linear regulator current sense pin. This pin is the positive input of the current sense comparator. - Linear regulator current sense pin. This pin is the negative input of the current sense comparator. - Negative feedback pin for the linear regulator error amplifier. - Linear regulator output drive pin. This pin can drive either a Darlington NPN or an Nchannel MOSFET. - Signal GND. It also serves as the power GND for the upper gate driver.
PIN 10: CLN - 4-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 16 combinations of DAC inputs.
PIN 11: VLFB PIN 12: LIDRI
PIN 13: GND
PIN 7: 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 8: FB - The error amplifier inverting input pin. The FB pin and COMP pin are used to compensate the voltage-control
PIN 14: 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. PIN 15: 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-
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AIC1566
current protection.
PHYSICAL DIMENSIONS
20 LEAD PLASTIC SO (300 mil) (unit: mm)
D
SYMBOL A A1
E H
MIN 2.35 0.10 0.33 0.23 12.60 7.40 1.27(TYP) 10.00 0.40
MAX 2.65 0.30 0.51 0.32 13.00 7.60 10.65 1.27
B C D E
e
A
e H
L
B
C
L
A1
7

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