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PDF ADP2443 Data sheet ( Hoja de datos )
| Número de pieza | ADP2443 | |
| Descripción | Synchronous Step-Down DC-to-DC Regulator | |
| Fabricantes | Analog Devices | |
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Data Sheet
3 A, 36 V, Synchronous Step-Down
DC-to-DC Regulator
ADP2443
FEATURES
Continuous output current: 3 A
Input voltage: 4.5 V to 36 V
Integrated MOSFETs: 98 mΩ/35 mΩ
Reference voltage: 0.6 V ± 1%
Fast minimum on time: 50 ns
Programmable switching frequency: 200 kHz to 1.8 MHz
Synchronizes to external clock: 200 kHz to 1.8 MHz
Precision enable and power good
Cycle-by-cycle current limit with hiccup protection
External compensation
Programmable soft start time
Startup into a precharged output
Supported by ADIsimPower design tool
APPLICATIONS
Intermediate power rail conversion
Multicell battery powered systems
Process control and industrial automation
Healthcare and medical
Networking and servers
TYPICAL APPLICATION CIRCUIT
VIN
CIN
RRAMP
RT
CVREG
ADP2443
PVIN
EN
BST
SW
RAMP
PGOOD
RT/SYNC
VREG
FB
COMP
SS
GND PGND
CBST L
RTOP
RC
CSS
RBOT
CC
VOUT
COUT
Figure 1.
GENERAL DESCRIPTION
The ADP2443 is synchronous step-down, dc-to-dc regulator
with an integrated 98 mΩ, high-side power metal oxide semicon-
ductor field effect transistor (MOSFET) and a 35 mΩ, synchronous
rectifier MOSFET to provide a high efficiency solution in a
compact 4 mm × 4 mm LFCSP package. The regulators operate
from an input voltage range of 4.5 V to 36 V. The output voltage
can be adjusted down to 0.6 V and deliver up to 3 A of
continuous current. The fast 50 ns minimum on time allows the
regulators convert high input voltage to low output voltage at high
frequency.
The ADP2443 uses an emulated current mode, constant frequency
pulse-width modulation (PWM) control scheme for excellent
stability and transient response. The switching frequency of the
ADP2443 can be programmed from 200 kHz to 1.8 MHz. The
synchronization function allows the switching frequency be syn-
chronized with an external clock to minimize the system noise.
The ADP2443 targets high performance applications that require
high efficiency and design flexibility. External compensation
and an adjustable soft start function provide design flexibility.
The power-good output and precision enable input provide
simple and reliable power sequencing.
Other key features include undervoltage lockout (UVLO),
overvoltage protection (OVP), overcurrent protection (OCP),
short-circuit protection (SCP), and thermal shutdown (TSD).
The ADP2443 operates over the −40°C to +125°C operating
junction temperature range and is available in a 24-lead, 4 mm ×
4 mm LFCSP package.
100
95
90
85
80
75
70
65
VOUT = 5V
VOUT = 3.3V
60
55
50
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
Figure 2. Efficiency vs. Output Current, VIN = 24 V, fSW = 300 kHz
Rev. 0
Document Feedback
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
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADP2443
Data Sheet
SPECIFICATIONS
VPVIN = 12 V, TJ = −40°C to +125°C for minimum/maximum specifications, TA = 25°C for typical specifications, unless otherwise noted.
Table 1.
Parameters
PVIN
PVIN Voltage Range
Quiescent Current
Symbol
VPVIN
IQ
Shutdown Current
ISHDN
PVIN Undervoltage Lockout Threshold
FB
Regulation Voltage
Bias Current
ERROR AMPLIFIER (EA)
Transconductance
Source Current
Sink Current
INTERNAL REGULATOR (VREG)
VREG Voltage
Dropout Voltage
Regulator Current Limit
SW
High-Side On Resistance1
Low-Side On Resistance1
Low-Side Valley Current Limit
Low-Side Negative Current Limit
Leakage Current
SW Minimum On Time
SW Minimum Off Time
BST
Bootstrap Voltage
OSCILLATOR (RT/SYNC)
Switching Frequency
Switching Frequency Range
Synchronization Range
SYNC Minimum Pulse Width
SYNC Minimum Off Time
SYNC Input Voltage
High
Low
SS
SS Pin Pull-Up Current
PGOOD
Power-Good Range
FB Rising Threshold
FB Rising Hysteresis
FB Falling Threshold
FB Falling Hysteresis
Power-Good Deglitch Time
Power-Good Leakage Current
Power-Good Output Low Voltage
VFB
IFB
gm
ISOURCE
ISINK
VVREG
RDSON_HS
RDSON_LS
tMIN_ON
tMIN_OFF
VBOOT
fSW
ISS
Test Conditions/Comments
No switching, RAMP connected to PVIN
through a resistor
EN = GND
PVIN rising
PVIN falling
−40°C < TJ < +125°C
VFB = 0.45 V
VFB = 0.75 V
VPVIN = 12 V, IVREG = 10 mA
VPVIN = 12 V, IVREG = 30 mA
BST pin voltage (VBST) − VSW = 5 V
VVREG = 5 V
VSW = 0 V, EN = GND
RT = 280 kΩ
Both rising and falling
VPGOOD = 5 V
IPGOOD = 1 mA
Min Typ Max Unit
4.5 36 V
0.868 1.1 mA
28 57 µA
4.3 4.45 V
3.8 3.9
V
0.594 0.6 0.606 V
0.05 0.2 µA
485 515 545 µS
50 µA
50 µA
4.9 5
5.1 V
320 mV
100 mA
98 147 mΩ
35 58 mΩ
3.9 4.7 5.1 A
2
2.5 3
A
1.5 7.9 µA
50 65 ns
200 235 ns
4.65 5
5.2 V
540 600 660 kHz
200 1800 kHz
200 1800 kHz
100 ns
100 ns
1.3 V
0.4 V
3.0 3.4 3.8 µA
108 110 112 %
5%
88 90 92 %
5%
16 Clock cycles
0.1 1
µA
220 300 mV
Rev. 0 | Page 4 of 24
5 Page 
ADP2443
5.10
5.05
5.00
4.95
4.90
4.85
4.80
–40
–20 0
20 40 60 80 100
TEMPERATURE (°C)
Figure 17. VREG Voltage vs. Temperature
120
140
120
100
80
60
40
20
0
–40 –20
0
RDSON_HS
RDSON_LS
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 18. MOSFET On Resistor vs. Temperature
VOUT (AC)
1
IL
T
SW
4
2
CH1 10.0mV BW CH2 10.0V
M2.00µs
A CH2
CH4 1.0A BW T 50.00%
Figure 19. Working Mode Waveform
10.0V
Data Sheet
620
610
600
590
RT = 280kΩ
580
570
–40
–20 0
20 40 60 80 100
TEMPERATURE (°C)
Figure 20. Frequency vs. Temperature
120
6.0
5.5
5.0
4.5
4.0
3.5
3.0
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 21. Current-Limit Threshold vs. Temperature
T
EN
3
VOUT
1
PGOOD
2
IL
4
CH1 2.00V BW CH2 5.00V BW M2.00ms A CH3
CH3 20.0V BW CH4 1.00A BW T 25.30%
Figure 22. Voltage Precharged Output
11.2V
Rev. 0 | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ADP2443.PDF ] | |
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