Synchronous Current-Mode with
Constant On-Time, PWM Buck Controller
ADP1882/ADP1883
FEATURES
TYPICAL APPLICATIONS CIRCUIT
V
= 2.75V TO 20V
IN
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: 0.8 V
0.8 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 (ADP1883 only)
Resistor-programmable current-sense gain
Thermal overload protection
VIN
C
C
ADP1882/
ADP1883
COMP/EN BST
C
IN
C
C2
R
C
R
TOP
V
OUT
C
Q1
BST
L
V
FB
DRVH
SW
OUT
R
BOT
C
GND
OUT
Q2
C
VDD2
VDD
DRVL
PGND
R
RES
LOAD
V
= 2.75V TO 5.5V
DD
C
VDD
Short-circuit protection
Figure 1.
Precision enable input
Integrated bootstrap diode for high-side drive
140 μA shutdown supply current
100
Starts into a precharged load
Small, 10-lead MSOP package
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
V
V
= 5.5V, V = 13.0V
IN
DD
DD
APPLICATIONS
= 5.5V, V = 16.5V
IN
Telecom and networking systems
Mid to high end servers
Set-top boxes
V
V
V
= 5.5V, V = 5.5V (PSM)
IN
DD
DD
DD
= 5.5V, V = 5.5V
IN
= 3.6V, V = 5.5V
IN
DSP core power supplies
T
= 25°C
A
V
= 1.8V
OUT
= 300kHz
f
SW
WURTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8mΩ
INFINEON MOSFETs:
BSC042N03MS G (UPPER/LOWER)
100
1k
10k
100k
LOAD CURRENT (mA)
Figure 2. ADP1882/ADP1883 Efficiency vs. Load Current
(VOUT = 1.8 V, 300 kHz)
GENERAL DESCRIPTION
The ADP1882/ADP1883 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-
limit, current-control scheme. In addition, these devices offer
optimum performance at low duty cycles by using valley current-
mode control architecture. This allows the ADP1882/ADP1883
to drive all N-channel power stages to regulate output voltages
as low as 0.8 V.
Available in three frequency options (300 kHz, 600 kHz, and
1.0 MHz, plus the PSM option), the ADP1882/ADP1883 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 they also can
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 ADP1883 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 (ADP1883)
section for more information).
The ADP1882/ADP1883 operate over the −40°C to +125°C
junction temperature range and are available in a 10-lead MSOP.
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
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