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ADP1873 Datasheet

PWM Buck Controller

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ADP1873 pdf
Data Sheet
Synchronous Current-Mode with
Constant On-Time, PWM Buck Controller
ADP1872/ADP1873
FEATURES
Power input voltage as low as 2.75 V to 20 V
Bias supply voltage range: 2.75 V to 5.5 V
Minimum output voltage: 0.6 V
0.6 V reference voltage with ±1.0% accuracy
Supports all N-channel MOSFET power stages
Available in 300 kHz, 600 KHz, and 1.0 MHz options
No current-sense resistor required
Power saving mode (PSM) for light loads (ADP1873 only)
Resistor-programmable current-sense gain
Thermal overload protection
Short-circuit protection
Precision enable input
Integrated bootstrap diode for high-side drive
140 µA shutdown supply current
Starts into a precharged load
Small, 10-lead MSOP package
APPLICATIONS
Telecom and networking systems
Mid to high end servers
Set-top boxes
DSP core power supplies
TYPICAL APPLICATIONS CIRCUIT
VIN = 2.75V TO 20V
CC
RC CC2
VOUT
RTOP
RBOT
CVDD2
VDD = 2.75V
TO 5.5V
CVDD
VIN
ADP1872/
ADP1873
COMP/EN BST
FB DRVH
GND
SW
VDD
DRVL
PGND
CIN
CBST
Q1 L
VOUT
COUT +
Q2
RRES
LOAD
5A
Figure 1.
100
VDD = 5.5V, VIN = 5.5V (PSM)
95
VDD = 5.5V, VIN = 5.5V
90
85
80 VDD = 5.5V, VIN = 13.0V (PSM)
75
VDD = 5.5V, VIN = 16.5V (PSM)
70
65
60
55
50
45
100
TA = 25°C
VOUT = 1.8V
fSW = 300kHz
WURTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8mΩ
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k 100k
LOAD CURRENT (mA)
Figure 2. ADP1872 Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)
GENERAL DESCRIPTION
The ADP1872/ADP1873 are versatile current-mode, synchronous
step-down controllers that provide superior transient response,
optimal stability, and current limit protection by using a constant
on-time, pseudo-fixed frequency with a programmable current-
sense gain, current-control scheme. In addition, these devices offer
optimum performance at low duty cycles by using valley current-
mode control architecture. This allows the ADP1872/ADP1873
to drive all N-channel power stages to regulate output voltages
as low as 0.6 V.
The ADP1873 is the power saving mode (PSM) version of the
device and is capable of pulse skipping to maintain output
regulation while achieving improved system efficiency at light
loads (see the Power Saving Mode (PSM) Version (ADP1873)
section for more information).
Available in three frequency options (300 kHz, 600 kHz, and
1.0 MHz, plus the PSM option), the ADP1872/ADP1873 are
well suited for a wide range of applications. These ICs not only
operate from a 2.75 V to 5.5 V bias supply, but can also accept a
power input as high as 20 V.
In addition, an internally fixed, soft start period is included to limit
input in-rush current from the input supply during startup and
to provide reverse current protection during soft start for a pre-
charged output. The low-side current-sense, current-gain scheme
and integration of a boost diode, along with the PSM/forced pulse-
width modulation (PWM) option, reduce the external part count
and improve efficiency.
The ADP1872/ADP1873 operate over the −40°C to +125°C
junction temperature range and are available in a 10-lead MSOP.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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 ©2009–2012 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADP1873 Datasheet

PWM Buck Controller

No Preview Available !

ADP1873 pdf
ADP1872/ADP1873
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Applications Circuit............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
Boundary Condition.................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
ADP1872/ADP1873 Block Digram.............................................. 17
Theory of Operation ...................................................................... 18
Startup.......................................................................................... 18
Soft Start ...................................................................................... 18
Precision Enable Circuitry ........................................................ 18
Undervoltage Lockout ............................................................... 18
Thermal Shutdown..................................................................... 18
Programming Resistor (RES) Detect Circuit.......................... 19
Valley Current-Limit Setting .................................................... 19
Hiccup Mode During Short Circuit......................................... 20
Synchronous Rectifier................................................................ 21
Power Saving Mode (PSM) Version (ADP1873).................... 21
REVISION HISTORY
7/12—Rev. A to Rev. B
Changed RON = 15 mΩ/100 kΩ Valley Current Level Value from
7.5 to 3.87; Table 6 .......................................................................... 20
Changes to Ordering Guide .......................................................... 40
3/10—Rev. 0 to Rev. A
Changes to Figure 1.......................................................................... 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 5
Changes to Figure 59 Caption and Figure 60 Caption .............. 16
Changes to Figure 64...................................................................... 17
Changes to Timer Operation Section .......................................... 22
Changes to Table 7.......................................................................... 23
Changes to Inductor Section......................................................... 28
Data Sheet
Timer Operation ........................................................................ 21
Pseudo-Fixed Frequency ........................................................... 22
Applications Information .............................................................. 23
Feedback Resistor Divider ........................................................ 23
Inductor Selection ...................................................................... 23
Output Ripple Voltage (ΔVRR) .................................................. 23
Output Capacitor Selection....................................................... 23
Compensation Network ............................................................ 24
Efficiency Consideration........................................................... 25
Input Capacitor Selection.......................................................... 26
Thermal Considerations............................................................ 27
Design Example.......................................................................... 27
External Component Recommendations.................................... 30
Layout Considerations................................................................... 32
IC Section (Left Side of Evaluation Board)............................. 37
Power Section ............................................................................. 37
Differential Sensing.................................................................... 37
Typical Application Circuits ......................................................... 38
Dual-Input, 300 kHz High Current Application Circuit ...... 38
Single-Input, 600 kHz Application Circuit ............................. 38
Dual-Input, 300 kHz High Current Application Circuit ...... 39
Outline Dimensions ....................................................................... 40
Ordering Guide .......................................................................... 40
Changes to Table 9.......................................................................... 31
Changes to Figure 82...................................................................... 32
Changes to Figure 83...................................................................... 33
Changes to Figure 84...................................................................... 34
Changes to Figure 85...................................................................... 35
Changes to Figure 86...................................................................... 36
Changes to Differential Sensing Section and Figure 88 ............ 37
Changes to Figure 89 and Figure 90............................................. 38
Changes to Figure 91...................................................................... 39
Updated Outline Dimensions....................................................... 40
10/09—Revision 0: Initial Version
Rev. B | Page 2 of 40


Part Number ADP1873
Description PWM Buck Controller
Maker Analog Devices
Total Page 30 Pages
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