Programmable Synchronous Buck Converter with Dual Adjustable Dropout L

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Programmable Synchronous Buck Converter with Dual Adjustable Dropout L

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RT9222
Programmable Synchronous Buck Converter with Dual Adjustable Dropout Linear Regulator Controller
RT9222 integrates controller low-dropout linear regulators into single chip. controller provides core voltage controlled 5-bit linear section regulates power bus, clock driver other circuits motherboards. controller provides adjustable Intel-compatible 1.3V~3.5V output voltage. synchronous N-MOSFET driver with switching frequency optimizes efficiency, device size, cost built-in over-voltage current-limiting protection prevent from damage. Power-good signal sent when core voltage within ±10% setting point. linear section dropout regulator which drives cost transistors. output level user-adjustable programmed external resistors internal 1.265V reference.
Features
Provides Regulated Voltages N-MOSFET Driver High Efficiency Switching Section Power-good, Over-voltage, Currentlimiting Protection Switching Section Adjustable Output Voltage Linear Section Linear Section Uses Cost Transistor Power Device TTL-compatible 5-bit Core Output Voltage
Applications
Power Supply Pentium, Pentium Pentium Alpha
PowerPC
6x86
Microprocessors
High-power 3.xV DC-DC Regulators Low-voltage Distributed Power Supplies Programmable Power Supplies
Ordering Information
RT9222 Package type SOP-24 Operating temperature range Commercial standard
Configurations
Part Number RT9222CS (Plastic SOP-24) Configurations
VIEW
GATE1 LDOS1 LDOS2 PGOOD
GATE2 LDOV VID0
VID1 VID2
VID3 VID4 VSEN SHDN BSTH BSTL
PGNDH PGNDL
DS9222-04 2001
www.richtek-ic.com.tw
RT9222
Absolute Maximum Ratings
PGND BSTH BSTL Ambient Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, sec.) Package Thermal Resistance SOP-24, 75°C/W -0.3 +5.5V 0.3V -0.3 +14V +70°C +125°C +150°C 300°C
Electrical Characteristics
(VCC PGNDH PGNDL VSEN VOUT; (VCSP-VCSN) 60mV; 25°C) Parameter Switching Section Output Voltage Supply Voltage Supply Current Load Regulation Line Regulation Power Reset Trip Point Current Limit Voltage Oscillator Frequency Oscillator Duty Cycle Source Sink Source Sink Threshold Voltage Source Current Power Good Threshold Voltage Linear Sections Quiescent Current Reference Voltage Gain (AOL) Load Regulation Line Regulation Note: output voltage table. VLINE VREF LDOS1/2 GATE1/2 VLOAD LDOV 11.4V 12.6V LDOV -1.240 -1.265 1.290 IOVP VOVP 3.0V VSEN Rising DMAX VBSTH VPGNDH VBSTL VPGNDL VLIMIT VOUT VLOAD 0.8A VLINE 4.75V 5.25V Rising VCSP VCSN -4.5 -5.5 -113 Symbol Test Conditions Units
www.richtek-ic.com.tw
DS9222-04 2001
RT9222
Function Block Diagram
SHDN CURRENT LIMIT
70mV VID4 VID3 VID2 VID1 VID0 VSEN PGOOD OPEN DRAIN 200KHz SHOOTTHROUGH CONTROL BSTL DRIVER PGNDL OSCILLATOR BSTH PGNDH LEVEL SHIFT DRIVER
ERROR
LDOS1 GATE1 LINEAR CONTROLLER 2.5V 1.265 LINEAR CONTROLLER 1.5V
DS9222-04 2001
LDOV GATE2 LDOS2 www.richtek-ic.com.tw
1.25V
RT9222
Description
Name GATE1 LDOS1 LDOS2 PGOOD PGNDH PGNDL BSTL BSTH SHDN VSEN VID4 VID3 VID2 VID1 VID0
Function Small signal analog digital ground LDO1 gate drive output LDO1 sense input LDO2 sense input Input voltage High signal setting point +20% Open collector logic output, High within setting point Current sense input (Negative) Current sense input (Positive) High side drive High side driver output Power ground side switch side driver output Supply side driver Supply high side driver Logic shutdown converter internal feedback chain Programming input (MSB) Programming input Programming input Programming input Programming input (LSB) +12V section LDO2 gate drive output
LDOV GATE2
Note: logic level inputs outputs compatible.
www.richtek-ic.com.tw
DS9222-04 2001
RT9222
Table Output Voltage Program Test Output Voltage Conditions application circuit 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 1.281 1.330 1.379 1.428 1.478 1.527 1.576 1.625 1.675 1.724 1.773 1.822 1.871 1.921 1.970 2.019 1.960 2.058 2.156 2.254 2.352 2.450 2.548 2.646 2.744 2.842 2.940 3.038 3.136 3.234 3.332 3.430 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 1.320 1.370 1.421 1.472 1.523 1.573 1.624 1.675 1.726 1.776 1.827 1.878 1.929 1.979 2.030 2.081 2.040 2.142 2.244 2.346 2.448 2.550 2.652 2.754 2.856 2.958 3.060 3.162 3.264 3.366 3.468 3.570 Units
DS9222-04 2001
www.richtek-ic.com.tw
RT9222
Typical Application Circuit
0.1µF 0.1µF 1.0K 2.32K
1500µFx2
VID0 VID1 VID2 VID3 VID4 SHDN 0.1µF
VID0 VSEN VID1 PGOO VID4 VID2 VID3 BSTH SHDN PGNDH PGNDL GATE2 BSTL GATE1 LDOV LDOS2 LDOS1 RT9222
PHB83N03LT PHB95N03LT 1500µFx4
VCC_CORE 0.1µF
RFD3055
VLIN1 1000µF
PGOOD 1000µF +C10 1000µF RFD3055
0.1µF VLIN2
0.1µF
1000µF
www.richtek-ic.com.tw
DS9222-04 2001
RT9222
Package Information
Symbol
Dimensions Millimeters 15.189 7.391 2.362 0.330 1.194 0.229 0.102 10.008 0.381 15.596 7.595 2.642 0.508 1.346 0.330 0.305 10.643 1.270
Dimensions Inches 0.598 0.291 0.093 0.013 0.047 0.009 0.004 0.394 0.015 0.614 0.299 0.104 0.020 0.053 0.013 0.012 0.419 0.050
DS9222-04 2001
www.richtek-ic.com.tw
RT9222
RICHTEK TECHNOLOGY CORP.
Headquarter
Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, 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
www.richtek-ic.com.tw
DS9222-04 2001

Programmable Synchronous Buck Converter with Dual Adjustable Dropout L

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