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PDF ADP1871 Data sheet ( Hoja de datos )
| Número de pieza | ADP1871 | |
| Descripción | (ADP1870 / ADP1871) Synchronous Buck Controller | |
| Fabricantes | Analog Devices | |
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Synchronous Buck Controller with
Constant On-Time and Valley Current Mode
ADP1870/ADP1871
FEATURES
Power input voltage range: 2.95 V to 20 V
On-board bias regulator
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 (ADP1871 only)
Resistor-programmable current-sense gain
Thermal overload protection
Short-circuit protection
Precision enable input
Integrated bootstrap diode for high-side drive
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 ADP1870/ADP1871 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 utilizing valley
current-mode control architecture. This allows the ADP1870/
ADP1871 to drive all N-channel power stages to regulate output
voltages as low as 0.6 V.
The ADP1871 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 (ADP1871)
section for more information).
Available in three frequency options (300 kHz, 600 kHz, and
1.0 MHz, plus the PSM option), the ADP1870/ADP1871 are well
suited for a wide range of applications that require a single-input
power supply range from 2.95 V to 20 V. Low voltage biasing is
supplied via a 5 V internal LDO.
TYPICAL APPLICATIONS CIRCUIT
VIN = 2.95V TO 20V
CC
VOUT RTOP
RC
CC2
RBOT
CVREG2
VIN
ADP1870/
ADP1871
COMP/EN BST
FB DRVH
GND
SW
VREG DRVL
PGND
CVREG
CIN
CBST
Q1 L
VOUT
COUT
Q2
RRES
LOAD
Figure 1.
100
95 VIN = 5V (PSM)
90
85
80
75
70 VIN = 16.5V
65
60 VIN = 13V
55 VIN = 13V (PSM)
50
45
40 VIN = 16.5V (PSM)
35
30
25
10
100
TA = 25°C
VOUT = 1.8V
fSW = 300kHz
WÜRTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8mΩ
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k 100k
LOAD CURRENT (mA)
Figure 2. Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)
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 ADP1870/ADP1871 operate over the −40°C to +125°C
junction temperature range and are available in a 10-lead MSOP
package.
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.
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.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VREG to PGND, 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 (VREG + 0.3 V)
−0.3 V to (VREG + 0.3 V)
−2.0 V to +28 V
−0.6 V to (VREG + 0.3 V)
−0.3 V to 28 V
−0.3 V to VREG
±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.
ADP1870/ADP1871
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
213.1
171.7
Unit
°C/W
°C/W
1 θJA is specified for the worst-case conditions; that is, θJA is specified for the
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
Rev. 0 | Page 5 of 44
5 Page 
338
VIN = 13V
+125°C
334
VIN = 16.5V
+25°C
–40°C
330
326
322
318
314
310
306
302
298
0
800 1600 2400 3200 4000 4800 5600 6400 7200 8000 8800
LOAD CURRENT (mA)
Figure 28. Frequency vs. Load Current, 300 kHz, VOUT = 7 V
540
VIN = 13V
VIN = 16.5V
+125°C
+25°C
–40°C
510
480
450
420
390
360
330
300
0
1200 2400 3600 4800 6000 7200 8400 9600 10,800 12,000
LOAD CURRENT (mA)
Figure 29. Frequency vs. Load Current, 600 kHz, VOUT = 0.8 V
675
VIN = 13V
655 VIN = 16.5V
635
615
595
575
555
535
515
495
0
+125°C
+25°C
–40°C
1000 2000 3000 4000 5000 6000 7000 8000 9000 10,000
LOAD CURRENT (mA)
Figure 30. Frequency vs. Load Current, 600 kHz, VOUT = 1.8 V
ADP1870/ADP1871
740
733
726
719
712
705
698
691
684
677
670
663
656
649
642
635
628
621
0
VIN = 13V
VIN = 16.5V
+125°C
+25°C
–40°C
800 1600 2400 3200 4000 4800 5600 6400 7200 8000 8800 9600
LOAD CURRENT (mA)
Figure 31. Frequency vs. Load Current, 600 kHz, VOUT = 5 V
850
VIN = 13V
+125°C
VIN = 16.5V
+25°C
–40°C
775
700
625
550
475
400
0
2000
4000
6000
8000
LOAD CURRENT (mA)
10,000 12,000
Figure 32. Frequency vs. Load Current, VOUT = 1.0 MHz, 0.8 V
1225
1150
VIN = 13V
VIN = 16.5V
+125°C
+25°C
–40°C
1075
1000
925
850
775
700
625
550
0
1200 2400 3600 4800 6000 7200 8400 9600 10,800 12,000
LOAD CURRENT (mA)
Figure 33. Frequency vs. Load Current, 1.0 MHz, VOUT = 1.8 V
Rev. 0 | Page 11 of 44
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADP1871.PDF ] | |
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