|
|
PDF ADP1872 Data sheet ( Hoja de datos )
| Número de pieza | ADP1872 | |
| Descripción | PWM Buck Controller | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADP1872 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
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.
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VDD to GND
VIN to PGND
FB, COMP/EN to GND
DRVL to PGND
SW to PGND
SW to PGND
BST to SW
BST to PGND
DRVH to SW
PGND to GND
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)
−0.3 V to +28 V
−2 V pulse (20 ns)
−0.6 V to (VDD + 0.3 V)
−0.3 V to +28 V
−0.3 V to VDD
±0.3 V
−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.
ADP1872/ADP1873
Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all other voltages are
referenced to PGND.
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
θJA
213.1
171.7
Unit
°C/W
°C/W
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. B | Page 5 of 40
5 Page 
Data Sheet
700
670
640
610
580
550
520
490
460
430
400
370
340
310
280
250
220
190
0
VIN = 5.5V
VIN = 13V
VIN = 16.5V
+125°C
+25°C
–40°C
2000 4000 6000 8000 10,000 12,000 14,000 16,000
LOAD CURRENT (mA)
Figure 28. Frequency vs. Load Current, 600 kHz, VOUT = 0.8 V
815
795
775
755
735
715
695
675
655
635
615
595
575
555
535
515
495
0
VIN = 5.5V
VIN = 13V
VIN = 16.5V
+125°C
+25°C
–40°C
2000 4000 6000 8000 10,000 12,000 14,000 16,000 18,000 20,000
LOAD CURRENT (mA)
Figure 29. Frequency vs. Load Current, 600 kHz, VOUT = 1.8 V
705
698
691
684
677
670
663
656
649
642
635
628
621
614
607
600
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 30. Frequency vs. Load Current, 600 kHz, VOUT =5 V
ADP1872/ADP1873
1300
1125
1150
VIN = 5.5V
VIN = 13V
VIN = 16.5V
+125°C
+25°C
–40°C
1075
1000
925
850
775
700
625
550
475
400
0
2000 4000 6000 8000 10,000 12,000 14,000 16,000
LOAD CURRENT (mA)
Figure 31. Frequency vs. Load Current, VOUT = 1.0 MHz, 0.8 V
1450
1375
1300
1225
1150
1075
1000
925
850
775
700
625
550
0
VIN = 5.5V
VIN = 13V
VIN = 16.5V
MIN-OFF TIME
ENCROACHMENT
+125°C
+25°C
–40°C
2000 4000 6000 8000 10,000 12,000 14,000 16,000 18,000 20,000
LOAD CURRENT (mA)
Figure 32. Frequency vs. Load Current, 1.0 MHz, VOUT = 1.8 V
1450
1400
1350
VIN = 13V
VIN = 16.5V
+125°C
+25°C
–40°C
1300
1250
1200
1150
1100
1050
1000
0
800 1600 2400 3200 4000 4800 5600 6400 7200 8000
LOAD CURRENT (mA)
Figure 33. Frequency vs. Load Current, 1.0 MHz, VOUT = 4 V
Rev. B | Page 11 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADP1872.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADP1870 | (ADP1870 / ADP1871) Synchronous Buck Controller | Analog Devices |
| ADP1871 | (ADP1870 / ADP1871) Synchronous Buck Controller | Analog Devices |
| ADP1872 | PWM Buck Controller | Analog Devices |
| ADP1873 | PWM Buck Controller | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |