Datasheet ADP5070 (Analog Devices)

1 A/0.6 A, DC-to-DC Switching Regulator with Independent Positive and Negative Outputs Data Sheet ADP5070 FEATURES TYPICAL APPLICATION CIRCUIT Wide input supply voltage range: 2.85 V to 15 V ADP5070 Generates well regulated, independently resistor SS INBK R programmable V C1 L1 POS and VNEG outputs COMP1 V Boost regulator to generate V CC1 POS POS output SW1 EN1 Adjustable positive output to 39 V D1 CVREG RFT1 Integrated 1.0 A main switch VREG FB1 C R OUT1 Optional single-ended primary-inductor converter (SEPIC) FB1 PVIN1 configuration for automatic step-up/step-down VIN PVIN2 PGND C PVINSYS Inverting regulator to generate V IN1 CVREF NEG output VREF Adjustable negative output to V EN2 IN − 39 V RFB2 C Integrated 0.6 A main switch RC2 OUT2 COMP2 FB2 True shutdown for both positive and negative outputs C RFT2 C2 SYNC/FREQ 1.2 MHz/2.4 MHz switching frequency with optional external SW2 SLEW D2 VNEG frequency synchronization from 1.0 MHz to 2.6 MHz SEQ AGND L2 Resistor programmable soft start timer
001
Slew rate control for lower system noise
12068-
Individual precision enable and flexible start-up sequence
Figure 1.
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 t ool 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 The ADP5070 includes a fixed internal or resistor programmable generates independently regulated positive and negative rails. soft start timer to prevent inrush current at power-up. During The input voltage range of 2.85 V to 15 V supports a wide variety of shutdown, both regulators completely disconnect the loads from applications. The integrated main switch in both regulators enables the input supply to provide a true shutdown. generation of an adjustable positive output voltage up to +39 V Other key safety features in the ADP5070 include overcurrent and a negative output voltage down to −39 V below input voltage. protection (OCP), overvoltage protection (OVP), thermal The ADP5070 operates at a pin selected 1.2 MHz/2.4 MHz shutdown (TSD), and input undervoltage lockout (UVLO). switching frequency. The ADP5070 can synchronize with an The ADP5070 is available in a 20-lead LFCSP or in a 20-lead external oscil ator from 1.0 MHz to 2.6 MHz to ease noise TSSOP and is rated for a −40°C to +125°C junction temperature filtering in sensitive applications. Both regulators implement range. programmable slew rate control circuitry for the MOSFET driver stage to reduce electromagnetic interference (EMI).
Table 1. Family Models Model Boost Switch (A) Inverter Switch (A)
Flexible start-up sequencing is provided with the options of ADP5070 1.0 0.6 manual enable, simultaneous mode, positive supply first, and ADP5071 2.0 1.2 negative supply first.
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Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION PWM MODE PSM MODE UNDERVOLTAGE LOCKOUT (UVLO) OSCILLATOR AND SYNCHRONIZATION INTERNAL REGULATORS PRECISION ENABLING SOFT START SLEW RATE CONTROL CURRENT-LIMIT PROTECTION OVERVOLTAGE PROTECTION THERMAL SHUTDOWN START-UP SEQUENCE APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL COMPONENT SELECTION Feedback Resistors Output Capacitors Input Capacitor VREG Capacitor VREF Capacitor Soft Start Resistor Diodes Inductor Selection for the Boost Regulator Inductor Selection for the Inverting Regulator LOOP COMPENSATION Boost Regulator Inverting Regulator COMMON APPLICATIONS SUPER LOW NOISE WITH OPTIONAL LDOS SEPIC STEP-UP/STEP-DOWN OPERATION LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE