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RT9223
5-Bit Programmable Synchronous PWM Buck Converter Controller
General Description
The RT9223 is a high efficiency synchronous switching regulator for modern CPU application. The output is controlled by a 5-bit DAC programmed from 1.3V to 2.05V in 0.05V steps and from 2.1V to 3.5V in 0.1V increments. The switching controller drivers two N-MOSFETs at 200KHz frequency and provides an optimal solution for size, efficiency and cost in any application circuits. The controller also offers integrated functions including PGOOD, output enable, overvoltage, internal digital-count soft start, and currentlimiting protection in one chip.
Features
High Efficiency Synchronous N-MOSFET Driver Operating at 200KHz 1.3V ~ 2.05V (0.05V steps) and 2.1V ~ 3.5V (0.1V steps) Output Voltage Enable Input, PGOOD Output, OVP, and Current-limiting Protection Internal Digital-count Soft Start
Applications
Power Supply for Pentium Pro K6
TM TM
, PowerPC
TM
,
, 6x86
TM
, and Alpha
TM
Microprocessors
High-power 5V to 3.xV DC-DC Regulators Low-voltage Distributed Power Supplies Programmable Step-down Power Supplies
Ordering Information
RT9223 Package type S : SOP-20 Operating temperature range C: Commercial standard
Pin Configurations
Part Number RT9223CS (Plastic SOP-20) Pin Configurations
TOP VIEW
GND 1 VCC 2 OVP 3 PGOOD CSN CSP PGNDH DH
4 5 6 7 8 20 19 18 17 16 15 14 13 12 11
VID0 VID1 VID2 VID3 VID4 VSEN SHDN BSTH BSTL DL
NC 9 PGNDL 10
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RT9223
Absolute Maximum Ratings
VCC to GND PGND to GND BST to GND Ambient Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Package Thermal Resistance SOP-20, JA 87C/W -0.3 to +5.5V 0.3V -0.3 to +14V 0 to +70C 0 to +125C -65 to +150C 300C
Electrical Characteristics
(VCC = 5V; GND = 0V; PGNDH = PGNDL = 0V; VSEN = VOUT; 0mV < (VCSP-VCSN) < 60mV; TA = 25C) Parameter Switching Section Output Voltage Supply Voltage Supply Current Load Regulation Line Regulation Power On Reset Trip Point Current Limit Voltage Oscillator Frequency Oscillator Max Duty Cycle DH Source DH Sink DL Source DL Sink OVP Threshold Voltage OVP Source Current Power Good Threshold Voltage Note: (1) See output voltage table. IOVP VOVP = 3.0V VSEN Rising DMAX VBSTH - VDH = 1V VDH - VPGNDH = 1V VBL - VDL = 5V VDL - VPGNDL = 1V VLIMIT VOUT VCC ICC VLOAD IO = 0.8A to 15A VLINE VCC = 4.75V to 5.25V VCC Rising VCSP - VCSN IO = 2A VCC -4.3 ----65 170 90 ----114 10 87 (1) -2 1 0.5 4.2 75 200 95 4.5 3.5 1 2 120 ---5.5 5 ---85 230 -----122 -115 -V mA % % V mV KHz % A % mA % Symbol Test Conditions Min Typ Max Units
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RT9223
Function Block Diagram
VCC CSN CSP SHDN CURRENT LIMIT
1.25V REF
70mV VID4 VID3 VID2 VID1 VID0 VSEN PGOOD + OPEN DRAIN 200KHz _ _ + + SHOOTTHROUGH CONTROL BSTL DRIVER + _ DL PGNDL DAC OSCILLATOR BSTH R Q S PGNDH LEVEL SHIFT AND DRIVER DH
VCC
_
ERROR AMP
OVP
+
GND
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RT9223
Pin Description
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin Name GND VCC OVP PGOOD CSN CSP PGNDH DH NC PGNDL DL BSTL BSTH SHDN VSEN VID4 VID3 VID2 VID1 VID0
(1) (1) (1) (1) (1) (1) (1)
Pin Function Small signal analog and digital ground Power supply input High signal out if VO > setting point +20% Open collector logic output; High if VO within 10% of the setting point Current sense input (Negative) Current sense input (Positive) High side drive GIND High side driver output No connection Low side drive GND Low side driver output Supply for low side driver Supply for high side driver Logic low shutdown the converter Top end of internal feedback chain Programming input (MSB) Programming input Programming input Programming input Programming input (LSB)
Note: (1) All logic level inputs and outputs are TTL compatible.
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RT9223
Table 1 Output Voltage Program Test Output Voltage Conditions IO = 2A in application circuit VID 43210 01111 01110 01101 01100 01011 01010 01001 01000 00111 00110 00101 00100 00011 00010 00001 00000 11111 11110 11101 11100 11011 11010 11001 11000 10111 10110 10101 10100 10011 10010 10001 10000 Min 1.287 1.336 1.386 1.435 1.485 1.534 1.584 1.633 1.683 1.732 1.782 1.831 1.881 1.930 1.980 2.029 1.980 2.079 2.178 2.277 2.376 2.475 2.574 2.673 2.772 2.871 2.970 3.069 3.168 3.267 3.366 3.465 Typ 1.300 1.350 1.400 1.450 1.500 1.550 1.600 1.650 1.700 1.750 1.800 1.850 1.900 1.950 2.000 2.050 2.000 2.100 2.200 2.300 2.400 2.500 2.600 2.700 2.800 2.900 3.000 3.100 3.200 3.300 3.400 3.500 Max 1.313 1.364 1.414 1.465 1.515 1.566 1.616 1.667 1.717 1.768 1.818 1.869 1.919 1.970 2.020 2.071 2.020 2.121 2.222 2.323 2.424 2.525 2.626 2.727 2.828 2.929 3.030 3.131 3.232 3.333 3.434 3.535 Units V
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RT9223
Typical Application Circuit
5V IN C1 0.1F R6 10 C7 1F C2 1000Fx3 + R2 10K R5 10 Q1 Q2 L1 4H R3 5m + C3 1000Fx6 C4 0.1F VOUT
1N5817 R3 R4
12V IN
OVP VID0 VID1 VID2 VID3 VID4
VCC 3 OVP 20 VID0 19 VID1 18 VID2 17 14 1 10 C6 0.1F
2
6 CSP 5 CSN 15 VSEN 4 PGOOD 16 VID4 13 VID3 BSTH 8 SHDN DH 7 GND PGNDH 11 DL PGNDL BSTL 12 NC RT9223
C5 0.1F
2.32k 1.00k
SHDN PGOOD
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Package Information
H M
B
B
J
A C F D
I
Symbol A B C D F H I J M
Dimensions In Millimeters Min 12.598 7.391 2.362 0.330 1.194 0.229 0.102 10.008 0.381 Max 13.005 7.595 2.642 0.508 1.346 0.330 0.305 10.643 1.270
Dimensions In Inches Min 0.496 0.291 0.093 0.013 0.047 0.009 0.004 0.394 0.015 Max 0.512 0.299 0.104 0.020 0.053 0.013 0.012 0.419 0.050
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RT9223
RICHTEK TECHNOLOGY CORP.
Headquarter
6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw
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