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PDF ADP5071 Data sheet ( Hoja de datos )
| Número de pieza | ADP5071 | |
| Descripción | DC-to-DC Switching Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
2 A/1.2 A DC-to-DC Switching Regulator with
Independent Positive and Negative Outputs
ADP5071
FEATURES
Wide input supply voltage range: 2.85 V to 15 V
Generates well regulated, independently resistor
programmable VPOS and VNEG outputs
Boost regulator to generate VPOS output
Adjustable positive output to 39 V
Integrated 2.0 A main switch
Optional single-ended primary-inductor converter
(SEPIC) configuration for automatic step-up/step-down
Inverting regulator to generate VNEG output
Adjustable negative output to VIN − 39 V
Integrated 1.2 A main switch
True shutdown for both positive and negative outputs
1.2 MHz/2.4 MHz switching frequency with optional external
frequency synchronization from 1.0 MHz to 2.6 MHz
Resistor programmable soft start timer
Slew rate control for lower system noise
Individual precision enable and flexible start-up sequence
control for symmetric start, VPOS first, or VNEG first
Out-of-phase operation
UVLO, OCP, OVP, and TSD protection
4 mm × 4 mm, 20-lead LFCSP and 20-lead TSSOP
−40°C to +125°C junction temperature range
Supported by the ADIsimPower tool set
APPLICATIONS
Bipolar amplifiers, ADCs, DACs, and multiplexers
Charge-coupled device (CCD) bias supply
Optical module supply
RF power amplifier (PA) bias
GENERAL DESCRIPTION
The ADP5071 is a dual high performance dc-to-dc regulator that
generates independently regulated positive and negative rails.
The input voltage range of 2.85 V to 15 V supports a wide variety of
applications. The integrated main switch in both regulators enables
generation of an adjustable positive output voltage up to +39 V
and a negative output voltage down to −39 V below input voltage.
The ADP5071 operates at a pin selected 1.2 MHz/2.4 MHz
switching frequency. The ADP5071 can synchronize with an
external oscillator from 1.0 MHz to 2.6 MHz to ease noise
filtering in sensitive applications. Both regulators implement
programmable slew rate control circuitry for the MOSFET
driver stage to reduce electromagnetic interference (EMI).
Flexible start-up sequencing is provided with the options of
manual enable, simultaneous mode, positive supply first, and
negative supply first.
Rev. A
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.
TYPICAL APPLICATION CIRCUIT
RC1
CC1
CVREG
ADP5071
SS INBK
COMP1
EN1
SW1
VREG
FB1
VIN
CIN1
RC2
CC2
PVIN1
PVIN2
PVINSYS
EN2
PGND
VREF
COMP2
FB2
SYNC/FREQ
SLEW
SEQ AGND
SW2
L1
D1
RFT1
RFB1
CVREF
RFB2
RFT2
D2
L2
VPOS
COUT1
COUT2
VNEG
Figure 1.
The ADP5071 includes a fixed internal or resistor programmable
soft start timer to prevent inrush current at power-up. During
shutdown, both regulators completely disconnect the loads from
the input supply to provide a true shutdown.
Other key safety features in the ADP5071 include overcurrent
protection (OCP), overvoltage protection (OVP), thermal
shutdown (TSD), and input undervoltage lockout (UVLO).
The ADP5071 is available in a 20-lead LFCSP or in a 20-lead
TSSOP and is rated for a −40°C to +125°C junction temperature
range.
Table 1. Family Models
Model
Boost Switch (A)
Inverter Switch (A)
ADP5070
ADP5071
1.0
2.0
0.6
1.2
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADP5071
Data Sheet
Parameter
INVERTING REGULATOR
Reference Voltage
Reference Voltage Accuracy
Feedback Voltage
Feedback Voltage Accuracy
Feedback Bias Current
Overvoltage Protection Threshold
Symbol
VREF
VREF − VFB2
IFB2
VOV2
Min
−0.5
−1.5
−0.5
−1.5
Load Regulation
Line Regulation
EA Transconductance
Power FET On Resistance
Power FET Maximum Drain Source Voltage
Current-Limit Threshold
Minimum On Time
Minimum Off Time
SOFT START
Soft Start Timer for Boost and Inverting
Regulators
∆(VREF − VFB2)/
ILOAD2
∆(VREF − VFB2)/
VPVIN2
gM2
RDS (ON) INVERTER
VDS (MAX) INVERTER
ILIM (INVERTER)
tSS
270
1200
Hiccup Time
THERMAL SHUTDOWN
Threshold
Hysteresis
tHICCUP
TSHDN
THYS
Typ
1.60
0.8
0.74
0.0004
0.003
300
350
39
1320
60
50
4
32
8 × tSS
150
15
Max
+0.5
+1.5
+0.5
+1.5
0.1
330
1440
Unit Test Conditions/Comments
V
%
%
V
%
%
µA
V
%/mA
TJ = 25°C
TJ = −40°C to +125°C
TJ = 25°C
TJ = −40°C to +125°C
At FB2 pin after soft start has
completed
ILOAD21 = 5 mA to 75 mA
%/V
µA/V
mΩ
V
mA
ns
ns
VPVIN2 = 2.85 V to 14.5 V, ILOAD21 =
25 mA
ms SS = open
ms SS resistor = 50 kΩ to GND
ms
°C
°C
1 ILOADx is the current through a resistive load connected across the output capacitor (where x is 1 for the boost regulator load and 2 for the inverting regulator load).
Rev. A | Page 4 of 27
5 Page 
ADP5071
100
80
60
40
20
0
0.001
0.01
LOAD (A)
0.1
TA = +125°C
TA = +25°C
TA = –40°C
1
Figure 16. Boost Regulator Efficiency over Temperature,
VIN = 5 V, VPOS = 15 V, fSW = 1.2 MHz
0.5
0.3
0.1
–0.1
–0.3
–0.5
0
VOUT ACCURACY
VFB1 ACCURACY
5 10 15 20
VIN (V)
Figure 17. Boost Regulator Line Regulation, VPOS = 15 V,
fSW = 1.2 MHz, 15 mA Load, TA = 25°C
0.5
0.3
0.1
–0.1
–0.3
–0.5
0
1.2MHz
2.4MHz
0.1 0.2 0.3 0.4 0.5
LOAD (A)
Figure 18. Boost Regulator Load Regulation, VIN = 5 V, VPOS = 15 V
Data Sheet
100
80
60
40
20
0
0.001
0.01
LOAD (A)
0.1
TA = +125°C
TA = +25°C
TA = –40°C
1
Figure 19. Inverting Regulator Efficiency over Temperature,
VIN = 5 V, VNEG = −15 V, fSW = 1.2 MHz
0.5
0.3
0.1
–0.1
–0.3
–0.5
0
VOUT ACCURACY
VREF ACCURACY
VFB2 ACCURACY
5 10 15 20
VIN (V)
Figure 20. Inverting Regulator Line Regulation, VNEG = −15 V,
fSW = 1.2 MHz, 15 mA Load, TA = 25°C
0.5
0.3
0.1
–0.1
–0.3
–0.5
0
0.05
0.10
LOAD (A)
1.2MHz
2.4MHz
0.15
Figure 21. Inverting Regulator Load Regulation, VIN = 5 V, VNEG = −15 V
Rev. A | Page 10 of 27
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ADP5071.PDF ] | |
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