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AIC1567
5-bit DAC, Synchronous PWM Power Regulator with Linear Controller
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. 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
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.
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.
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.
Analog Integrations Corporation DS-1567-00
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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AIC1567
ORDERING INFORMATION
AIC1567 XX PACKAGE TYPE S: SMALL OUTLINE TEMPERATURE RANGE C: 0C~70C
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 CLP 11 CLN 12 24 RT 23 OVP 22 VCC 21 LGATE 20 PGND 19 BOOT 18 UGATE 17 PHASE 16 PGOOD 15 GND 14 LIDRI 13 VLFB
AIC1567CS (PLASTIC SO)
TYPICAL APPLICATION CIRCUIT
1000pF R2 2.2K C8 0.1F VID0 VID1 VID2 VID3 VID4 C7 33pF R6 90.9K C6 1000pF R1 137 1% R5 3.01K R8 1.2M R7 237 1% VSEN OCSET SS VID0 VID1 VID2 VID3 VID4 COMP FB CLP CLN RT OVP VCC C2 0.1F C1 1F RFP45N03L M1 12V L1 1H +
5V
AIC1567
M3 FD3055
VI/O 3.3V 10A
R4 15K
+
C1 1000F
47K C5 0.1F
Pentium II VCORE and VI/O DC/DC Converter
NDP603AL
LGATE PGND BOOT UGATE PHASE PGOOD GND LIDRI VLFB
C3 1000F x 3
L2 M2 5V D1 3H 1N5820 + C4 1000F x8
VCORE
R3
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 ......................................................................................... 12V10% Ambient Temperature Range ........................................................................ 0C ~ 70C Junction Temperature Range ...................................................................... 0C ~100C
Thermal Information
Thermal Resistance, JA (Typical, Note 1) SOIC Package ..................................................................................... 100C/W SOIC Package (with 3 in2 of Copper) .................................................. 90C/W 150C 300C Maximum Junction Temperature (Plastic Package) ............................................. Maximum Lead Temperature (Soldering 10 sec) ................................................
Maximum Storage Temperature Range .................................................. -65C~150C
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=25C, unless otherwise
specified.) PARAMETER VCC Supply Current Nominal Supply Power-On Reset VCC Threshold Rising VOCSET Threshold Oscillator Free Running Frequency Total Variation Ramp Amplitude RT Open 6K< RT<200K RT Open VOSC 170 -20 1.5 200 230 +20 KHz % VP-P VOCSET=4.5V 7 1.26 8.5 V V UGATE Open IVCC 2 mA TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
3
AIC1567
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER Reference and DAC DACOUT 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 (VSEN/DACOUT) OCSET Current Source OVP Sourcing Current Soft Start Current Soft Start Sink Current under Current Limit Soft Start Sink Current under Hard Current Limit Power Good Upper Threshold (VVSEN /VDAC ) VVSEN Rising Lower Threshold (VVSEN / VDAC ) VVSEN Falling Hysteresis (VVSEN / VDAC ) PGOOD Voltage Low Linear Regulator VLFB Feedback Voltage VLFB Bias Current LIDRI Sourcing Current Current Limiting Threshold 10 10 20 30 1.18 1.21 40 1.24 V nA mA mV Upper and Lower Threshold IPGOOD=5mA VPGOOD 106 84 2 0.5 114 94 % % % V VVSEN =VDAC, VOCSET=5.0V, VPHASE =0V, VFB=VDAC=50mV VVSEN =0, VOCSET=5.0V, VPHASE=0V, VFB=0V 65 mA VOCSET=4.5VDC VVSEN=5.5V, VOVP=0V IOCSET IOVP ISS 106 170 30 10 130 115 200 125 230 % A mA A A RUGATE RUGATE RLGATE RLGATE 8.0 5.5 8.0 5.5 12 10 12 10 GBW SR 76 11 6 dB MHz V/S VDAC=1.8V ~3.5V -1.0 +1.0 % TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
4
AIC1567
BLOCK DIAGRAM
POWER-ON RESET OVP
+
115%
VCC
+
110% VSEN 90% 50%
+ +
OVP PGOOD OVER CURRENT
+ -
POWER GOOD
-
OCSET
10A SS 4V PHASE SOFT START VID0 VID1 VID2 VID3 VID4 VDAC 5BITS DAC
+ + +
200A
BOOT UGATE CONTROL LOGIC GND VCC LGATE PGND RT 1.2V LINEAR AMP.
+
ERROR AMP REFERENCE
PWM COMPARATOR OSCILLATOR
FB COMP
CLP CLN
-
+
+
CURRENT SENSE
LIDRI VLFB
-
20mV
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.
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. - 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.
PIN 2: 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 (IOCS), and the external MOSFET onresistance (RDS(ON)) jointly set the over current trip point according to the following equation:
PIN 11: CLP
PIN 12: CLN
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.
IPEAK =
IOCS 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 3: SS - Soft start pin. Connect a capacitor from this pin to ground. An internal 10A current source provides soft start function for the converter.
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
PIN 4: VID0 PIN 5: VID1 PIN 6: VID2 PIN 7: VID3 PIN 8: VID4
- 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
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 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 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. 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 22: VCC - The chip power supply pin. It also serves as power supply for LGATE driver. Recommended supply voltage is 12V. -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. - Frequency adjustment pin. Connecting a resistor (RT) from this pin to GND, increase the frequency by the following equation.
FS 200KHz + 5 x 10 5 log RT
PIN 23: OVP
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 18: UGATE- External MOSFET gate drive pin. Connect UGATE to gate of the external MOSFET. PIN 19: BOOT - External MOSFET driver power supply pin. To convert 5V main power
PIN 24: RT
PHYSICAL DIMENSIONS
24 LEAD PLASTIC SO (300 mil) (unit: mm)
D
SYMBOL A A1
E H
MIN 2.35 0.10 0.33 0.23 15.20 7.40 10.00 0.40
MAX 2.65 0.30 0.51 0.32 15.60 7.60 10.65 1.27
B C D E
e
A
e
A1
1.27(TYP)
H
C L
B
L
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