ADP1882 Datasheet PDF - Analog Devices
| Part Number | ADP1882 | |
| Description | Synchronous Current-Mode | |
| Manufacturers | Analog Devices | |
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Synchronous Current-Mode withwww.DataSheet4U.com
Constant On-Time, PWM Buck Controller
ADP1882/ADP1883
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: 0.8 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
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
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.
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).
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
TYPICAL APPLICATIONS CIRCUIT
VIN = 2.75V TO 20V
CC
VOUT RTOP
RC
CC2
RBOT
CVDD2
VDD = 2.75V TO 5.5V
CVDD
VIN
ADP1882/
ADP1883
COMP/EN BST
FB DRVH
GND
SW
VDD DRVL
PGND
CIN
CBST
Q1 L
VOUT
COUT
Q2
RRES
LOAD
Figure 1.
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
100
VDD = 5.5V, VIN = 13.0V
VDD = 5.5V, VIN = 16.5V
VDD = 5.5V, VIN = 5.5V (PSM)
VDD = 5.5V, VIN = 5.5V
VDD = 3.6V, VIN = 5.5V
TA = 25°C
VOUT = 1.8V
fSW = 300kHz
WURTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8mΩ
INFINEON MOSFETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k
LOAD CURRENT (mA)
100k
Figure 2. ADP1882/ADP1883 Efficiency vs. Load Current
(VOUT = 1.8 V, 300 kHz)
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 ADP1882/ADP1883 operate over the −40°C to +125°C
junction temperature range and are available in a 10-lead MSOP.
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
©2010 Analog Devices, Inc. All rights reserved.
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ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VDD to GND
VIN to PGND
FB, COMP/EN to GND
DRVL to PGND
SW to PGND
BST to SW
BST to PGND
DRVH to SW
PGND to GND
θJA (10-Lead MSOP)
2-Layer Board
4-Layer Board
Operating Junction Temperature Range
Storage Temperature Range
Soldering Conditions
Maximum Soldering Lead Temperature
(10 sec)
Rating
−0.3 V to +6 V
−0.3 V to +28 V
−0.3 V to (VDD + 0.3 V)
−0.3 V to (VDD + 0.3 V)
−2.0 V to +28 V
−0.8 V to (VDD + 0.3 V)
−0.3 V to 28 V
−0.3 V to VDD
±0.3 V
213.1°C/W
171.7°C/W
−40°C to +125°C
−65°C to +150°C
JEDEC J-STD-020
300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all other voltages are
referenced to PGND.
ADPw1ww8.D8a2taS/hAeeDt4UP.c1om883
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
θJA (10-Lead MSOP)
2-Layer Board
4-Layer Board
θJA1 Unit
213.1 °C/W
171.7 °C/W
1 θJA is specified for the worst-case conditions; that is, θJA is specified for device
soldered in a circuit board for surface-mount packages.
BOUNDARY CONDITION
In determining the values given in Table 2 and Table 3, natural
convection was used to transfer heat to a 4-layer evaluation board.
ESD CAUTION
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