ADP1829 Reference Design

Preliminary Technical Data
ADP1829 Reference Design
FCDC 00062
FEATURES
Five Output Voltages: 1.0V, 1.8V, 3.3V x 2, 5V
Output Current: 0.7A to 2.8A
Input voltage: 9-12V
Ripple 2% ppk of Output Voltage
Transient step ±5%, 50% max load
ADP1829 REFERENCE DESIGN DESCRIPTION
This ADP1829 Reference Design is a paper only design. The reference design uses 9V to 12V for in the input voltage. The
output voltages and currents are as follows: VOUT1 = 1.0 V with a maximum output current of 2.8 A, VOUT2 = 1.8V with a
maximum output current of 0.8A, VOUT3 = 3.3 V with a maximum output current of 0.7 A, VOUT4 = 5.0 V with a maximum
output current of 0.5 A and VOUT5 = 3.3 V with a maximum output current of 0.7 A.
Design criteria are for sequencing in the order: VOUT3 then VOUT2 then VOUT1. No ripple or transient specification were
supplied so assumptions of 2% peak to peak voltage ripple and 5% deviation due to 50% instantaneous load step are used,
unless other capacitors are present on the main board. The RF outputs are designed with extremely low ripple (<1mV) and
have a second filter stage to remove high frequency switching noise. The switching frequency is fixed at 300kHz for all
switching outputs. Synchronization can be implemented by a resistor stuffing option.
Rev. 1
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. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
Preliminary Technical Data
FCDC 00062
TABLE OF CONTENTS
Features....................................................................................................................................................................................................... 1
ADP1829 Reference Design Description .............................................................................................................................................. 1
Revision History........................................................................................................................................................................................ 2
GENERAL DESCRIPTION..................................................................................................................................................................... 3
ADP1829................................................................................................................................................................................................ 3
ADP1706/ADP1708 ............................................................................................................................................................................. 3
Typical Performance Characteristics...................................................................................................................................................... 4
Schematic ................................................................................................................................................................................................... 6
Bill of Materials ......................................................................................................................................................................................... 8
TABLE OF FIGURES
Figure 1.
Calculated efficiency of 1.0V output ................................................................................................................................ 4
Figure 2.
Calculated efficiency of 1.8V output ................................................................................................................................ 4
Figure 3.
Calculated efficiency of 3.8V output ................................................................................................................................ 5
Figure 4.
Calculated efficiency of 5.4V output ................................................................................................................................ 5
Figure 5.
ADP1829 Reference Design Schematic .......................................................................................................................... 6
REVISION HISTORY
10/3/2007—Revision 0: Initial Version
10/4/2007—Revision 1: Added linear to 5V output, labeled Signal ground for each switcher
Rev. 1 | Page 2 of 10
Preliminary Technical Data
FCDC 00062
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.
ADP1706/ADP1708
The ADP170X 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 1 A. The various
versions provide features such as Enable, Soft Start and Tracking. They are available is space saving LFCSP-8 and SOIC-8
packages and operate over the –40°C to +125°C temperature range.
Rev. 1 | Page 3 of 10
Preliminary Technical Data
FCDC 00062
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 1.
Calculated efficiency of 1.0V output
Figure 2.
Calculated efficiency of 1.8V output
Rev. 1 | Page 4 of 10
Preliminary Technical Data
FCDC 00062
Figure 3.
Calculated efficiency of 3.8V output
Figure 4.
Calculated efficiency of 5.4V output
Rev. 1 | Page 5 of 10
Preliminary Technical Data
FCDC 00062
SCHEMATIC
Figure 5.
ADP1829 Reference Design Schematic
Rev. 1 | Page 6 of 10
Preliminary Technical Data
FCDC 00062
Rev. 1 | Page 7 of 10
Preliminary Technical Data
FCDC 00062
BILL OF MATERIALS
Vout1, Vout2, and Vout3 Bill of Materials
Description
Capacitor Ceramic X7R 1u 0603 16V
Capacitor Ceramic X7R 10u 1206 16V
Capacitor Ceramic X7R 10n 0603 50V
Capacitor Ceramic X7R 100n 0603 16V
Capacitor Ceramic COG 33p 0603 50V
Capacitor Ceramic X7R 2.7n 0603 50V
Capacitor Ceramic X7R 2.2n 0603 50V
Capacitor Ceramic X7R 4.7n 0603 50V
Capacitor Ceramic X7R 15n 0603 16V
Capacitor Ceramic X7R 4.7u 0805 16V
Capacitor Ceramic X7R 22u 1206 6.3V
Capacitor Ceramic X7R 1.5n 0603 50V
Capacitor Ceramic COG 22p 0603 50V
Diode Schottky 200mA SOD-323 30V
Inductor Ferrite 15uH 7.3mm x 7.3mm
Inductor Ferrite 3.8uH 10.2mm x 10mm
Single N-Channel MOSFET TSOP-6 30V
Single N-Channel MOSFET TSOP-6 30V
1A Thick Film 0 Ohm jumper 0603
5% Thick Film 10 Ohms 0603
1% Thick Film 10.0k 0603
1% Thick Film 20.0k 0603
1% Thick Film 30.1k 0603
1% Thick Film 22.1 Ohms 0603
1% Thick Film 4.32k 0603
1% Thick Film 1.78k 0603
1% Thick Film 40.2k 0603
1% Thick Film 36.5k 0603
2 chan 300k to 600k PWM LFCSP-32
1A 3.3V Linear Reg SOIC-8 w/SS
Designator
Cvcc1, Cbias1, Cpv1
Cin11, Cin21, Co22
Css3
Cb1, Cb2
Clim1, Clim2, Cc20
Cc21
Cc12
Cc22
Css1, Css2
Cin31, Co31
Co21, Co11, Co12
Cc11
Cc10
Db1, Db2
L2
L1
QH1, QH2
QL1, QL2
Rf23, Rnsync
Rin1, Rpv1, Rc22
Rpg1, Rpg2, Rf22,
Ren
Rf11, Rf21
Rf12
Rc12
Rlim1
Rlim2
Rc11
Rc21
U1
U2
Quantity
3
3
1
2
3
1
1
1
2
2
3
1
1
2
1
1
2
2
2
3
Rev. 1 | Page 8 of 10
4
2
1
1
1
1
1
1
1
1
Manufacturer
Murata
Murata
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Murata
Murata
Vishay
Vishay
Diodes inc
Coilcraft
Coilcraft
Vishay
Vishay
Vishay
Vishay
MFR#
GRM188R71C105KA12D
GRM31CR71C106KAC7L
Generic
Generic
Generic
Generic
Generic
Generic
Generic
GRM21BR71C475KA73L
GRM31CR70J226KE19L
Generic
Generic
BAT54WS
MSS7341-153
MSS1038-382MLC
Si3456BDV
Si3424BDV
Generic
Generic
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Analog Devices
Analog Devices
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
ADP1829ACPZ
ADP1706ARDZ-3.3-R7
Preliminary Technical Data
FCDC 00062
Vout3 and Vout4 Bill of Materials
Description
Capacitor Ceramic X7R 2.2n 0603 50V
Capacitor Ceramic COG 150p 0603 50V
Capacitor Ceramic X7R 1.5n 0603 50V
Capacitor Ceramic X7R 1u 0603 16V
Capacitor Ceramic X7R 47n 0603 16V
Capacitor Ceramic X7R 10n 0603 50V
Capacitor Ceramic X7R 10u 1206 16V
Capacitor POSCAP 105C 150u 7343 16V
2nd source KO Cap 105C 150u 7343 16V
Capacitor POSCAP 105C 150u 7343 6.3V
2nd source KO Cap 105C 150u 7343 6.3V
Capacitor Ceramic X7R 100n 0603 16V
Capacitor Ceramic COG 33p 0603 50V
Capacitor Ceramic X7R 22u 1206 6.3V
Capacitor Ceramic X7R 4.7u 0805 16V
Diode Schottky 200mA SOD-323 30V
Inductor Ferrite 22uH 10.2mm x 10mm
Inductor Ferrite 33uH 7.3mm x 7.3mm
Inductor HF Ferrite 500Ohms 1206 2.0A
Single N-Channel MOSFET TSOP-6 30V
Single N-Channel MOSFET TSOP-6 30V
1A Thick Film 0 Ohm jumper 0603
5% Thick Film 10 Ohms 0603
1% Thick Film 10.0k 0603
1% Thick Film 20.0k 0603
1% Thick Film 1.50k 0603
1% Thick Film 2.49k 0603
1% Thick Film 2.26k 0603
1% Thick Film 1.07k 0603
1% Thick Film 3.74k 0603
1% Thick Film 40.2k 0603
1% Thick Film 147k 0603
1% Thick Film 28.0k 0603
2 chan 300k to 600k PWM LFCSP-32
1A 3.3V Linear Reg SOIC-8 w/SS
1A Adjustable Linear Reg SOIC-8
Designator
Cc11, Cc21
Cc10, Cc20
Cc12, Cc22
Cvcc, Cbias, Cpv
Css1, Css2
Css3
Cin11, Co11, Cin21,
Co21
Cinb
(Cinb)
Co12, Co22
(Co12), (Co22)
Cb1, Cb2
Clim1, Clim2
Cin31, Cin41
Co31, Co41
Db1, Db2
L1
L2
L3hf, L4hf
QH1, QH2
QL1, QL2
Rf23, Freql, Rnsync
Rin, Rpv
Rpg1, Rpg2, Ren3,
Ren4
Rf11, Rf21
Rc12, Rc22
Rf22
Rlim1
Rlim2
Rf12
Rc11, Rc21
Rf41
Rf42
U1
U2
U3
Quantity
2
2
2
3
2
1
Manufacturer
Vishay
Vishay
Vishay
Murata
Vishay
Vishay
MFR#
Generic
Generic
Generic
GRM188R71C105KA12D
Generic
Generic
4
1
(1)
2
(2)
2
2
2
2
2
1
1
2
2
2
3
2
Murata
Sanyo
Kemet
Sanyo
Kemet
Vishay
Vishay
Murata
Murata
Diodes inc
Coilcraft
Coilcraft
Taiyo Yuden
Vishay
Vishay
Vishay
Vishay
GRM31CR71C106KAC7L
16TQC68M
T520D686M016A(1)E050
6TPB150M
T520D157M006A(1)E055
Generic
Generic
GRM31CR70J226KE19L
GRM21BR71C475KA73L
BAT54WS
MSS1038-223MLC
MSS7341-333MLD
FBMH3216HM501NT
Si3456BDV
Si3424BDV
Generic
Generic
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Analog Devices
Analog Devices
Analog Devices
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
ADP1829ACPZ
ADP1706ARDZ-3.3-R7
ADP1708ARDZ-R7
Rev. 1 | Page 9 of 10
4
2
2
1
1
1
1
2
1
1
1
1
1
Preliminary Technical Data
FCDC 00062
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, stuff options ) 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. 1 | Page 10 of 10
Similar pages