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Dual, Interleaved, Step-Down
DC-to-DC Controller with Tracking
Data Sheet
FEATURES
Fixed frequency operation: 300 kHz, 600 kHz, or
V IN = 12V
ADP1829
TYPICAL APPLICATION CIRCUIT
synchronized operation up to 1 MHz
Supply input range: 3.0 V to 20 V
Wide power stage input range: 1 V to 24 V
180μF
1μF
PV IN
TRK1
EN1
EN2
180μF
Interleaved operation results in smaller, low cost
input capacitor
All-N-channel MOSFET design for low cost
±0.85% accuracy at 0 ° C to 70 ° C
IRLR7807Z
0.47μF
TRK2
VREG
BST1
DH1
BST2
DH2
0.47μF
IRLR7807Z
PGND1
Soft start, thermal overload, current-limit protection
10 μA shutdown supply current
Internal linear regulator
Lossless R DSON current-limit sensing
Reverse current protection during soft start for handling
precharged outputs
Independent Power OK outputs
1.2V,
6A
560μF
2.2μH
2k?
2 k?
IRFR3709Z
ADP1829
SW1 SW2
CSL1 CSL2
DL1 DL2
PGND2
FB2
2k ?
IRFR3709Z
390pF
2.2μH
2k?
1.8V,
8A
560μF
Voltage tracking for sequencing or DDR termination
Available in 5 mm × 5 mm, 32-lead LFCSP
APPLICATIONS
Telecommunications and networking systems
Medical imaging systems
2k?
390pF
4.53k? 3900pF
FB1 COMP2
COMP1
FREQ
LDOSD
GND SYNC
3900pF 4.53k?
1k?
Base station power
Set-top boxes
Printers
DDR termination
GENERAL DESCRIPTION
The ADP1829 is a versatile, dual, interleaved, synchronous
PWM buck controller that generates two independent output
rails from an input of 3.0 V to 20 V, with power input voltage
ranging from 1.0 V to 24 V. Each controller can be configured
to provide output voltages from 0.6 V to 85% of the input
voltage and is sized to handle large MOSFETs for point-of-load
regulators. The two channels operate 180 ° out of phase,
reducing stress on the input capacitor and allowing smaller, low
cost components. The ADP1829 is ideal for a wide range of
high power applications, such as DSP and processor core I/O
power, and general-purpose power in telecommunications,
medical imaging, PC, gaming, and industrial applications.
The ADP1829 operates at a pin-selectable, fixed switching
frequency of either 300 kHz or 600 kHz, minimizing external
component size and cost. For noise-sensitive applications, it can
also be synchronized to an external clock to achieve switching
Figure 1.
frequencies between 300 kHz and 1 MHz. The ADP1829
includes soft start protection to prevent inrush current from the
input supply during startup, reverse current protection during
soft start for precharged outputs, as well as a unique adjustable
lossless current-limit scheme utilizing external MOSFET sensing.
For applications requiring power supply sequencing, the
ADP1829 also provides tracking inputs that allow the output
voltages to track during startup, shutdown, and faults. This
feature can also be used to implement DDR memory bus
termination.
The ADP1829 is specified over the ?40 ° C to +125 ° C junction
temperature range and is available in a 32-lead LFCSP package.
Rev. C
Document Feedback
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ?2007–2012 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
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