Preliminary Technical Data ADP1829 Reference Design FCDC 00064 FEATURES Four Output Voltages: 7.0 V, 3.3 V, 1.8 V, 1.2 V Output Current: 1.6 A to 12.6 A Input voltage: 19-21 V Ripple 2% ppk of Output Voltage Transient step ±5%, 50% max load ADP1829 REFERENCE DESIGN DESCRIPTION This ADP1829 Reference Design uses 19.0 V to 21.0 V for the input voltage. The output voltages and currents are as follows: • VOUT1 = 7.0 V with a maximum output current of 12.6 A, • VOUT2 = 3.3 V with a maximum output current of 3.8 A, • VOUT3 = 1.8 V with a maximum output current of 1.6 A, • VOUT4 = 1.2 V with a maximum output current of 9.0 A. The ripple and transient assumptions are 2% peak to peak voltage ripple and 5% deviation due to 50% instantaneous load step. The nominal switching frequency is fixed at 300 kHz for all outputs. VOUT1 and VOUT2 are 180º out of phase from each other and VOUT3 and VOUT4 are 180º out of phase from each other. VOUT1 and VOUT2 are not synchronized with VOUT3 and VOUT4 . Synchronization could be done by connecting the synch pins of U1 and U3 to a 600kHz clock. Rev. 0 Reference designs are as supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of reference designs. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Reference designs are not authorized to be used in life support devices or systems. One Technology Way, P.O. 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Preliminary Technical Data FCDC 00064 TABLE OF CONTENTS Features....................................................................................................................................................................................................... 1 ADP1829 Reference Design Description .............................................................................................................................................. 1 Revision History........................................................................................................................................................................................ 2 General Description ................................................................................................................................................................................. 3 ADP1829................................................................................................................................................................................................ 3 Schematic ................................................................................................................................................................................................... 4 Bill of Materials ......................................................................................................................................................................................... 6 TABLE OF FIGURES Figure 1. Schematic: VOUT1 and VOUT2 ............................................................................................................................................... 4 Figure 2. Schematic: VOUT3 and VOUT4 ............................................................................................................................................... 5 REVISION HISTORY 10/1/2007—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Preliminary Technical Data FCDC 00064 GENERAL DESCRIPTION ADP1829 The ADP1829 is a versatile, dual output, interleaved, synchronous PWM buck controller that generates two independent outputs from an input voltage of 2.9 V to 20 V. Each channel can be configured to provide output voltage from 0.6V to 85% of the input voltage. The two channels operate 180° out of phase, which reduces the current stress on the input capacitor and allows the use of a smaller and lower cost input capacitor. The ADP1829 operates at a pin-selectable fixed switching frequency of either 300 kHz or 600 kHz. For some noise sensitive applications, it can also be synchronized to an external clock to achieve switching frequency between 300 kHz and 1 MHz. The switching frequency chosen is 300 kHz to get good efficiency over a wide range of input and output conditions. The ADP1829 includes an adjustable soft start to limit input inrush current, voltage tracking for sequencing or DDR termination, independent power-good output, and a power enable pin. It also provides current-limit and short-circuit protection by sensing the voltage on the synchronous MOSFET. Rev. 0 | Page 3 of 8 Preliminary Technical Data FCDC 00064 SCHEMATIC 7.0V at 12.6A and 3.3V at 3.8A 20Vin Rreg Qreg Dzreg Rf12 Enable Rc12 Cvcc1 Cc12 Creg Vreg_7 Rf11 Css1 Cbias1 Cc10 Cc11 Rc11 1 2 3 4 5 6 7 8 32 31 30 29 CMP1 TRK1 SS1 VREG 28 IN 27 26 LDO EN2 SD FB1 25 BST1 U1 FREQ DH1 ADP1829ACPZ GND SW1 UV2 CSL1 FB2 PGND1 CMP2 DL1 TRK2 Cc20 Rpg1 EN1 POK1 SYNC Dreg Rin1 PV POK7V0 24 Rcb1 QH1 23 Cin11 Cin12 Cb1 Dc1 22 21 20 Rlim1 Clim1 Db1 19 Vo7V0 Csn1 Rsn1 Rpv1 18 17 Co11 Co12 L1 Cinb QL1 Cpv1 QL2 SS2 POK2 BST2 DH2 SW2 CSL2 PGND2 DL2 9 10 11 12 13 14 15 16 Rsn2 Csn2 Rc21 Cc21 Clim2 Css2 Vo3V3 Db2 Rpg2 Rlim2 L2 Co21 Co22 POK3V3 Rf23 Rf22 Rc22 Rf21 Rcb2 Dc2 Cb2 Cc22 Figure 1. Schematic: VOUT1 and VOUT2 Rev. 0 | Page 4 of 8 QH2 Cin21 Preliminary Technical Data FCDC 00064 Figure 2. Schematic: VOUT3 and VOUT4 Rev. 0 | Page 5 of 8 Preliminary Technical Data FCDC 00064 BILL OF MATERIALS Table 1. Vout1 and Vout2 Bill of Materials (Vo7V0 and Vo3V3) Description Designator Quantity Manufacturer MFR# Capacitor Ceramic COG 150p 0603 50V Cc10 1 Vishay Generic Capacitor Ceramic X7R 4.7n 0603 50V Cc11 1 Vishay Generic Capacitor Ceramic COG 470p 0603 50V Cc12 1 Vishay Generic Capacitor Ceramic COG 100p 0603 50V Cc20 1 Vishay Generic Capacitor Ceramic X7R 2.2n 0603 50V Cc21 1 Vishay Generic Capacitor Ceramic COG 820p 0603 50V Cc22 1 Vishay Generic Capacitor Ceramic X7R 1u 0603 16V Cbias1, Cpv1, Cvcc1 3 Murata GRM188R71C105KA12D Capacitor Ceramic X7R 47n 0603 16V Css1 1 Vishay Generic Capacitor Ceramic X7R 33n 0603 16V Css2 1 Vishay Generic Capacitor Ceramic X5R 22u 1210 16V Co12 1 Murata grm32er61c226k Capacitor Ceramic X7R 100n 0603 16V Cb1, Cb2, Creg 3 Vishay Generic Capacitor Ceramic COG 33p 0603 50V Clim3, Clim4 2 Vishay Generic Capacitor Ceramic X7R 10u 1210 25V Co11, Cin11, Cin12, Co21, Cin21 5 C3225X7R1E106K Capacitor Al Poly 105C 39u 10mm x 7.7mm 25V Cinb 1 TDK Nippon Chemicon Diode Schottky 200mA SOD-323 30V Db1, Db2, Dreg 3 Diodes inc BAT54WS Diode Zener 200mW SOD-323 6.2V Dreg 1 Diodes inc BZT52C6V2S Inductor Powder 2.80uH 14.5mm x 13.2mm L1 1 Pulse PG0277.282NL P1172.103 APXA250ARA390MJ80G Inductor Ferrite 22uH 12.2mm x 12.2mm L2 1 Pulse Single N-Channel MOSFET PG-TSDSON-8 30V QH1 1 Infineon BSC050N03LS Single N-Channel MOSFET PG-TSDSON-8 30V QL1 1 Infineon BCS025N03LS Single N-Channel MOSFET PG-TSDSON-8 30V QH2 1 Infineon BSC120N03LS Single N-Channel MOSFET PG-TSDSON-8 30V QL2 1 Infineon BCS057N03LS Single NPN Transistor SOT-23 40V Qreg 1 Diodes inc MMBT3904 1A Thick Film 0 Ohm jumper 0603 Rf23, Rcb1, Rcb2 3 Vishay Generic 5% Thick Film 10 Ohms 0603 Rpv1, Rin1 2 Vishay Generic 1% Thick Film 10.0k 0603 Rpg1, Rpg2, Rreg 3 Vishay Generic 1% Thick Film 4.42k 0603 Rf22 1 Vishay Generic 1% Thick Film 1.87k 0603 Rf12 1 Vishay Generic 1% Thick Film 20.0k 0603 Rf11, Rf21 2 Vishay Generic 1% Thick Film 2.10k 0603 Rlim1 1 Vishay Generic 1% Thick Film 1.54k 0603 Rlim2 1 Vishay Generic 1% Thick Film 100 Ohms 0603 Rc12 1 Vishay Generic 1% Thick Film 2.26k 0603 Rc11 1 Vishay Generic 1% Thick Film 30.1 Ohms 0603 Rc22 1 Vishay Generic 1% Thick Film 7.32k 0603 Rc21 1 Vishay Generic 2 chan 300k to 600k PWM LFCSP-32 U1 1 Analog Devices ADP1829ACPZ Rev. 0 | Page 6 of 8 Preliminary Technical Data FCDC 00064 Table 2. Vout3 and Vout4 Bill of Materials (Vo1V8 and Vo1V2) Description Designator Quantity Manufacturer MFR# Capacitor Ceramic COG 100p 0603 50V Cc30 1 Vishay Generic Capacitor Ceramic X7R 2.7n 0603 50V Cc31 1 Vishay Generic Capacitor Ceramic COG 820p 0603 50V Cc32 1 Vishay Generic Capacitor Ceramic COG 56p 0603 50V Cc40 1 Vishay Generic Capacitor Ceramic X7R 2.2n 0603 50V Cc41 1 Vishay Generic Capacitor Ceramic X7R 1.0n 0603 50V Cc42 1 Vishay Generic Capacitor Ceramic X7R 1u 0603 16V Cbias3, Cpv3, Cvcc3 3 Murata GRM188R71C105KA12D Generic Capacitor Ceramic X7R 22n 0603 16V Css3, Css4 2 Vishay Capacitor Ceramic X7R 10u 1210 25V Cin31, Cin41 2 TDK C3225X7R1E106K Capacitor Ceramic X7R 100n 0603 16V Cb3, Cb4 2 Vishay Generic Capacitor Ceramic COG 33p 0603 50V Clim3, Clim4 2 Vishay Generic Capacitor Ceramic X5R 22u 1210 16V Co31, Co41, Co42 3 grm32er61c226k Capacitor Al Poly 105C 390u 6.3mm x 5.8mm 2.5V Co43 1 Murata Nippon Chemicon Diode Schottky 200mA SOD-323 30V Db3, Db4 2 Diodes inc BAT54WS Inductor Ferrite 12uH 12.2mm x 12.2mm L3 1 Pulse P1172.123 Inductor Ferrite 1.3uH 12.2mm x 12.2mm L4 1 Pulse P1172.132 Single N-Channel MOSFET 2x2 WDFN 30V QH3, QL3 2 On-Semi NTLJS4114N-D Single N-Channel MOSFET PG-TSDSON-8 30V QL4 1 Infineon BCS025N03LS Single N-Channel MOSFET PG-TSDSON-8 30V QH4 1 Infineon BSC120N03LS 1A Thick Film 0 Ohm jumper 0603 Rf43, Rcb3, Rcb4 3 Vishay Generic 5% Thick Film 10 Ohms 0603 Rpv3, Rin3 2 Vishay Generic 1% Thick Film 10.0k 0603 Rf32, Rpg3, Rpg4, Rc41 4 Vishay Generic 1% Thick Film 20.0k 0603 Rf31, Rf41, Rf42 3 Vishay Generic 1% Thick Film 2.49k 0603 Rlim3 1 Vishay Generic 1% Thick Film 1.65k 0603 Rlim4 1 Vishay Generic 1% Thick Film 60.4 Ohms 0603 Rc32 1 Vishay Generic 1% Thick Film 5.90k 0603 Rc31 1 Vishay Generic 1% Thick Film 4.12k 0603 Rc42 1 Vishay Generic 2 chan 300k to 600k PWM LFCSP-32 U3 1 Analog Devices ADP1829ACPZ Rev. 0 | Page 7 of 8 APXF2R5ARA391MF61G Preliminary Technical Data FCDC 00064 NOTES Reference designators shown on the schematic but not listed on the Bill of Materials are place holders for possible design adjustments (snubbers, additional decoupling capacitors and clamp diodes). These components should be put in the layout, but not populated unless after testing it is deemed necessary. If a different number, or different type of output capacitors are used on the switching outputs the loop compensation components may need adjustment. ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB Rev. 0 | Page 8 of 8