ADP1829 and ADP1715 Reference Design

Preliminary Technical Data
ADP1829 and ADP1715 Reference
Design
FCDC 00058
FEATURES
Five Output Voltages: 5.0 V, 3.3 V, 3.3 V low noise, 2.5 V, 1.3 V
Output Current: 0.005 A to 1.65 A
Input voltage: 8-16 V
Ripple 2% ppk of Output Voltage
Transient step ±5%, 50% max load
ADP1829 AND ADP1715 REFERENCE DESIGN DESCRIPTION
This ADP1829 and ADP1715 Reference Design uses 8.0 V to 16.0 V for the input voltage. The output voltages and currents
are as follows:
•
VOUT1 = 5.0 V with a maximum output current of 1.65 A,
•
VOUT2 = 3.3 V with a maximum output current of 1.3 A,
•
VOUT3 = 3.3 V with a maximum output current of 0.35 A (low noise),
•
VOUT4 = 2.5 V with a maximum output current of 0.005 A (low noise),
•
VOUT5 = 1.3 V with a maximum output current of 0.3 A (low noise).
The ripple and transient assumptions are 2% peak to peak voltage ripple (for the switchers) and 5% deviation due to 50%
instantaneous load step respectively. The nominal switching frequency is fixed at 300 kHz for VOUT1 and VOUT2. All other
outputs are filtered, or linear regulated out of the switching rails.
Rev. 0
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©2007 Analog Devices, Inc. All rights reserved.
Preliminary Technical Data
FCDC 00058
TABLE OF CONTENTS
Features....................................................................................................................................................................................................... 1
ADP1829 and ADP1715 Reference Design Description..................................................................................................................... 1
Revision History........................................................................................................................................................................................ 2
General Description ................................................................................................................................................................................. 3
ADP1829................................................................................................................................................................................................ 3
ADP171X ............................................................................................................................................................................................... 3
ADP5041................................................................................................................................................................................................ 3
Schematic ................................................................................................................................................................................................... 4
Bill of Materials ......................................................................................................................................................................................... 5
TABLE OF FIGURES
Figure 1.
Schematic: VOUT1 , VOUT2 , VOUT3 , VOUT4 and VOUT5 ......................................................................................................... 4
REVISION HISTORY
9/10/2007—Revision 0: Initial Version
Rev. 0 | Page 2 of 6
Preliminary Technical Data
FCDC 00058
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.
ADP171X
The ADP171X is a family of low drop out CMOS linear regulators that provides versatile and inexpensive step-down
voltage regulation. The input voltage range is 2.5 V to 5.5 V and the output current capability is up to 500 mA. The various
versions provide features such as Enable, Soft Start, Low Noise Bypass and Tracking. They are available is space saving
TSOT-5 and MSOP-8 packages and operate over the –40°C to +125°C temperature range.
ADP5041
The ADR15811 is a low cost, 2-terminal (shunt), precision voltage reference. It provides an accurate 2.5 V output for input
currents between 60 μA and 15 mA.
The ADR5041 is available in two grades, A and B, both of which are available in either the SOT-23 or the SC-70 package.
Both grades are specified over the extended industrial temperature range of −40°C to +125°C. The ADP5041 is pin
compatible with the LM4040 and LM4050.
Rev. 0 | Page 3 of 6
Preliminary Technical Data
FCDC 00058
SCHEMATIC
Figure 1.
Schematic: VOUT1 , VOUT2 , VOUT3 , VOUT4 and VOUT5
Rev. 0 | Page 4 of 6
Preliminary Technical Data
FCDC 00058
BILL OF MATERIALS
Table 1. Vout1, Vout2, Vout3, Vout4, and Vout5 Bill of Materials (Vo5V0, Vo3V3, 3V3_L, 2V5_L and 1V3_L)
Description
Designator
Quantity
Manufacturer
MFR#
Capacitor Ceramic COG 68p 0603 50V
Cc30
1
Vishay
Generic
Capacitor Ceramic X7R 1.8n 0603 50V
Cc31
1
Vishay
Generic
Capacitor Ceramic COG 680p 0603 50V
Cc32
1
Vishay
Generic
Capacitor Ceramic COG 56p 0603 50V
Cc40
1
Vishay
Generic
Capacitor Ceramic X7R 1.5n 0603 50V
Cc41, Co71
2
Vishay
Generic
Capacitor Ceramic COG 820p 0603 50V
Cc42
1
Vishay
Generic
Capacitor Ceramic X7R 1u 0603 25V
Cvcc3
1
Murata
GRM188R71E105KA12D
Capacitor Ceramic X7R 1u 0603 16V
Cbias3, Cpv3
2
Murata
GRM188R71C105KA12D
Capacitor Ceramic X7R 22n 0603 16V
Css3, Css4
2
Vishay
Generic
Capacitor Ceramic X7R 10n 0603 50V
Css5, Css6
2
Vishay
Generic
Capacitor Ceramic X5R 10u 1206 25V
Cin31, Cin41
2
Murata
grm31cr61e106k
Capacitor Ceramic X5R 2.2u 0805 16V
Cin51, Co51, Cin61,
Co61
4
Murata
GRM21BR61C225KA88L
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 10u 1210 10V
Co31, Co41
2
Murata
grm32er61a106k
Capacitor Al Poly 105C 82u 10mm x 7.7mm 20V
Cinb
1
Nippon Chemi-con
APXA200ARA820MJ80G
Diode Schottky 200mA SOD-323 30V
Db3, Db4
2
Diodes inc
BAT54WS
Inductor Ferrite 15.0uH 7.6mm x 7.6mm
L3
1
Cooper
DR74-150-R
Inductor Ferrite 22uH 7.6mm x 7.6mm
1
Cooper
DR74-220-R
Single N-Channel MOSFET SOT23-6 30V
L4
QH3, QL3, QH4,
QL4
4
Vishay
Si3465BDV
1A Thick Film 0 Ohm jumper 0603
Rf43
1
Vishay
Generic
5% Thick Film 10 Ohms 0603
Rpv3, Rin3
2
Vishay
Generic
1% Thick Film 113 Ohms 0603
Rin7
1
Vishay
Generic
1% Thick Film 10.0k 0603
Rpg3, Rpg4
2
Vishay
Generic
1% Thick Film 4.42k 0603
Rf42
1
Vishay
Generic
1% Thick Film 2.74k 0603
Rf32
1
Vishay
Generic
1% Thick Film 20.0k 0603
Rf31, Rf41
2
Vishay
Generic
1% Thick Film 3.83k 0603
Rlim3
1
Vishay
Generic
1% Thick Film 3.01k 0603
Rlim4
1
Vishay
Generic
1% Thick Film 35.7 Ohms 0603
Rc32
1
Vishay
Generic
1% Thick Film 7.87k 0603
Rc31
1
Vishay
Generic
1% Thick Film 30.1 Ohms 0603
Rc42
1
Vishay
Generic
1% Thick Film 10.2k 0603
Rc41
1
Vishay
Generic
2 chan 300k to 600k PWM LFCSP-32
U3
1
Analog Devices
ADP1829ACPZ
500mA 3.3V Linear Reg MSOP-8 w/SS
U5
1
Analog Devices
ADP1715ARMZ-3.3-R7
500mA 1.3V Linear Reg MSOP-8 w/SS
U6
1
Analog Devices
ADP1715ARMZ-1.3-R7
15mA 2.5V Shunt Ref SC70
U7
1
Analog Devices
ADR5041AKSZ
Rev. 0 | Page 5 of 6
Preliminary Technical Data
FCDC 00058
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 resistors to adjust the output voltage of linear regulators).
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 6 of 6
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