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ADP3182 Datasheet

Adjustable Output 1-/2-/3-Phase Synchronous Buck Controller

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FEATURES
Selectable 1-, 2-, or 3-phase operation at up to 1 MHz per
phase
±2% worst-case differential sensing error over temperature
Externally adjustable 0.8 V to >5 V output from a 12 V supply
Logic-level PWM outputs for interface to external high
power drivers
Active current balancing between all output phases
Built-in power good/crowbar functions
Programmable short-circuit protection with programmable
latch-off delay
APPLICATIONS
Auxiliary supplies
DDR memory supplies
Point-of-load modules
Adjustable Output 1-/2-/3-Phase
Synchronous Buck Controller
ADP3182
GENERAL DESCRIPTION
The ADP3182 is a highly efficient multiphase, synchronous,
buck-switching regulator controller optimized for converting a
12 V main supply into a high current, low voltage supply for use
in point-of-load (POL) applications. It uses a multimode PWM
architecture to drive the logic-level outputs at a programmable
switching frequency that can be optimized for VR size and
efficiency. The phase relationship of the output signals can be
programmed to provide 1-, 2-, or 3-phase operation, allowing
for the construction of up to three complementary buck-
switching stages. The ADP3182 also provides accurate and
reliable short-circuit protection and adjustable current limiting.
ADP3182 is specified over the commercial temperature range of
0°C to +85°C and is available in a 20-lead QSOP package.
FUNCTIONAL BLOCK DIAGRAM
VCC
1
RAMPADJ RT
98
EN 6
UVLO
SHUTDOWN
& BIAS
GND 14
950mV
OSCILLATOR
CMP
SET EN
RESET
20 PWM1
FB
650mV
CURRENT
BALANCING
CIRCUIT
CMP
CMP
RESET
2 / 3-PHASE
DRIVER LOGIC
RESET
19 PWM2
18 PWM3
PWRGD 5
DELAY
ILIMIT 10
EN
DELAY 7
SOFT
START
1.05V
FB
CROWBAR
CURRENT
LIMIT
CIRCUIT
CURRENT
LIMIT
17 SW1
16 SW2
15 SW3
12 CSSUM
11 CSREF
13 CSCOMP
COMP 4
3 FB
ADP3182
800mV
REFERENCE
2
FBRTN
Figure 1.
Rev. 0
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
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADP3182 Datasheet

Adjustable Output 1-/2-/3-Phase Synchronous Buck Controller

No Preview Available !

ADP3182 pdf
ADP3182www.DataSheet4U.com
TABLE OF CONTENTS
Specifications..................................................................................... 3
Test Circuits....................................................................................... 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Description .............................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ........................................................................ 9
Start-Up Sequence........................................................................ 9
Master Clock Frequency.............................................................. 9
Output Voltage Differential Sensing .......................................... 9
Output Current Sensing .............................................................. 9
Current Control Mode and Thermal Balance ........................ 10
Voltage Control Mode................................................................ 10
Soft Start ...................................................................................... 10
Current Limit, Short-Circuit, and Latch-off Protection ....... 10
Power Good Monitoring ........................................................... 11
Output Crowbar ......................................................................... 11
REVISION HISTORY
10/04—Revision 0: Initial Version
Output Enable and UVLO ........................................................ 12
Applications..................................................................................... 14
Setting the Clock Frequency..................................................... 14
Soft Start and Current Limit Latch-Off Delay Time ............. 14
Inductor Selection ...................................................................... 14
Output Current Sense................................................................ 15
Output Voltage............................................................................ 16
Power MOSFETs......................................................................... 16
Ramp Resistor Selection............................................................ 17
Current Limit Setpoint .............................................................. 17
Feedback Loop Compensation Design.................................... 17
Input Capacitor Selection and Input Current di/dt ............... 18
Inductor DCR Temperature Correction ................................. 18
Layout and Component Placement ......................................... 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
Rev. 0 | Page 2 of 20


Part Number ADP3182
Description Adjustable Output 1-/2-/3-Phase Synchronous Buck Controller
Maker Analog Devices
Total Page 20 Pages
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