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PDF ADP2387 Data sheet ( Hoja de datos )
| Número de pieza | ADP2387 | |
| Descripción | Step-Down DC-to-DC Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
20 V, 6 A, Synchronous, Step-Down
DC-to-DC Regulator
ADP2387
FEATURES
Input voltage range: 4.5 V to 20 V
Integrated MOSFET: 44 mΩ typical/11 mΩ typical
Reference voltage: 0.6 V ± 1%
Continuous output current: 6 A
Programmable current-limit threshold
Programmable switching frequency: 200 kHz to 1400 kHz
Precision enable and power good
External compensation
Internal soft start with external adjustable option
Startup into a precharged output
Supported by ADIsimPower design tool
APPLICATIONS
Communications infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversion
DC-to-dc point of load applications
GENERAL DESCRIPTION
The ADP2387 is a synchronous step-down, dc-to-dc regulator with
an integrated 44 mΩ, high-side power, metal oxide semiconductor
field effect transistor (MOSFET) and an 11 mΩ, synchronous
rectifier MOSFET to provide a high efficiency solution in a
compact 4 mm × 4 mm LFCSP. This device uses a peak current
mode, constant frequency pulse-width modulation (PWM)
control scheme for excellent stability and transient response.
The switching frequency of the ADP2387 can be programmed
between 200 kHz to 1400 kHz.
The ADP2387 requires minimal external components and operates
from an input voltage of 4.5 V to 20 V. The output voltage can
be adjusted from 0.6 V to 90% of the input voltage and delivers
up to 6 A of continuous current. Each IC draws less than 110 μA
current from the input source when it is disabled.
This regulator 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. The programmable
current-limit function allows the inductor to be optimized by
output current.
TYPICAL APPLICATIONS CIRCUIT
VIN
CIN
RILIM
RT
CVREG
ADP2387
PVIN
BST
EN
PGOOD
SW
ILIM
RT
FB
COMP
VREG
SS
GND PGND
CBST L
RTOP
RC
CSS
RBOT
CC
VOUT
COUT
Figure 1.
Other key features include undervoltage lockout (UVLO),
overvoltage protection (OVP), overcurrent protection (OCP),
short-circuit protection (SCP), and thermal shutdown (TSD).
The ADP2387 operates over the −40°C to +125°C junction
temperature range and is available in a 24-lead, 4 mm × 4 mm
LFCSP.
100
95
90
85
80
75
70
65
60
55
50
0
VOUT = 5.0V
VOUT = 3.3V
VOUT = 1.2V
12345
OUTPUT CURRENT (A)
6
Figure 2. Efficiency vs. Output Current, VIN = 12 V, fSW = 300 kHz
Rev. B
Document Feedback
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 ©2014–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADP2387
Data Sheet
SPECIFICATIONS
VPVIN = 12 V, TJ = −40°C to +125°C for minimum/maximum specifications, and TA = 25°C for typical specifications, unless otherwise noted.
Table 1.
Parameter
PVIN
PVIN Voltage Range
Quiescent Current
Shutdown Current
PVIN Undervoltage Lockout Threshold
FB
FB Regulation Voltage
FB Bias Current
ERROR AMPLIFIER (EA)
Transconductance
EA Source Current
EA Sink Current
INTERNAL REGULATOR (VREG)
VREG Voltage
Dropout Voltage
Current-Limit Regulator
SW
High-Side On Resistance1
Low-Side On Resistance1
SW Minimum On Time
SW Minimum Off Time
BST
Bootstrap Voltage
OSCILLATOR (RT PIN)
Switching Frequency
Switching Frequency Range
CURRENT LIMIT
High-Side Peak
Low-Side Negative2
ILIM Voltage2
ILIM Current Range2
SS
Internal Soft Start
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
Symbol Test Conditions/Comments
VPVIN
IQ
ISHDN
UVLO
No switching
EN = GND
PVIN rising
PVIN falling
VFB 0°C < TJ < 85°C
−10°C < TJ < +115°C
−40°C < TJ < +125°C
IFB
gm
ISOURCE
ISINK
VVREG
VPVIN = 12 V, IVREG = 50 mA
VPVIN = 12 V, IVREG = 50 mA
RDSON_HS
RDSON_LS
tMIN_ON
tMIN_OFF
VBOOT
fSW
VBST − VSW = 5 V
VVREG = 8 V
RT = 100 kΩ
RILIM = 44.2 kΩ
RILIM = 66.5 kΩ
RILIM = 133 kΩ
VILIM
IILIM
ISS_UP
PGOOD from low to high
PGOOD from high to low
PGOOD from low to high
PGOOD from high to low
PGOOD from low to high
PGOOD from high to low
VPGOOD = 5 V
IPGOOD = 1 mA
Rev. B | Page 4 of 25
Min
4.5
2.4
50
3.6
596.4
595.2
594
380
40
40
7.6
62
4.6
540
200
7.7
5.1
2.3
4
2.2
Typ
2.9
80
4.3
3.8
600
600
600
0.01
480
60
60
8
350
100
44
11
130
200
5
600
9.2
6.1
2.9
2.5
0.6
1600
3.1
Max
20
3.6
110
4.4
603.6
604.8
606
0.1
580
80
80
8.4
138
70
18
165
260
5.4
660
1400
10.7
7.1
3.5
15
3.8
Unit
V
mA
µA
V
V
mV
mV
mV
µA
µS
µA
µA
V
mV
mA
mΩ
mΩ
ns
ns
V
kHz
kHz
A
A
A
A
V
µA
Clock cycles
µA
95
5
105
11.7
1024
16
0.01
125
0.1
190
%
%
%
%
Clock cycles
Clock cycles
µA
mV
5 Page 
ADP2387
65
HIGH-SIDE RDSON
LOW-SIDE RDSON
55
45
35
25
15
5
–40 –20
0
20 40 60 80 100
TEMPERATURE (°C)
Figure 17. MOSFET Resistor vs. Temperature
120
VOUT (AC)
IL
SW
Figure 18. Working Mode Waveform
EN
VOUT
PGOOD
IL
Figure 19. Precharged Output
Data Sheet
10
9
8
IOCP = 9A
7 IOCP = 6A
IOCP = 3A
6
5
4
3
2
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 20. Peak Current-Limit Threshold vs. Temperature
EN
VOUT
PGOOD
IOUT
Figure 21. Soft Start with Full Load
EN
VOUT
PGOOD
IOUT
Figure 22. Shutdown with Full Load
Rev. B | Page 10 of 25
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet ADP2387.PDF ] | |
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