ADP5070 Datasheet PDF - Analog Devices
| Part Number | ADP5070 | |
| Description | DC-to-DC Switching Regulator | |
| Manufacturers | Analog Devices | |
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Data Sheet
1 A/0.6 A, DC-to-DC Switching Regulator with
Independent Positive and Negative Outputs
ADP5070
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 1.0 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 0.6 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 ADP5070 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 ADP5070 operates at a pin selected 1.2 MHz/2.4 MHz
switching frequency. The ADP5070 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
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TYPICAL APPLICATION CIRCUIT
RC1
CC1
CVREG
ADP5070
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 ADP5070 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 ADP5070 include overcurrent
protection (OCP), overvoltage protection (OVP), thermal
shutdown (TSD), and input undervoltage lockout (UVLO).
The ADP5070 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)
ADP5070 1.0
ADP5071 2.0
Inverter Switch (A)
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
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ADP5070
Data Sheet
Parameter
INVERTING REGULATOR
Reference Voltage
Reference Voltage Accuracy
Feedback Voltage
Feedback Voltage Accuracy
Feedback Bias Current
Overvoltage Protection Threshold
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
Hiccup Time
THERMAL SHUTDOWN
Threshold
Hysteresis
Symbol
Min Typ Max Unit Test Conditions/Comments
VREF
VREF − VFB2
IFB2
VOV2
∆(VREF − VFB2)/
ILOAD2
∆(VREF − VFB2)/
VPVIN2
gM2
RDS (ON) INVERTER
VDS (MAX) INVERTER
−0.5
−1.5
−0.5
−1.5
270
1.60
0.8
0.74
0.0004
+0.5
+1.5
+0.5
+1.5
0.1
0.003
300 330
350
39
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 VPVIN2 = 2.85 V to 14.5 V, ILOAD21 = 15 mA
µA/V
mΩ
V
ILIM (INVERTER)
600 660
60
50
720 mA
ns
ns
tSS
tHICCUP
4
32
8 × tSS
ms SS = open
ms SS resistor = 50 kΩ to GND
ms
TSHDN
THYS
150 °C
15 °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).
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| Information | Total 28 Pages | |
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