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Analog Devices Inc. ADP1073AR
- Part No.:
- ADP1073AR
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1073AR.pdf
- Description:
- IC REG BUCK BOOST ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,592
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Product details
Overview
ADP1073AR from Analog Devices is a micropower step-up/step-down switching regulator IC with fixed 3.3 V output, internal 1 A power switch, and operation down to 1.0 V input. It supports both boost and buck topologies, delivers up to 40 mA at 3.3 V from 1.25 V input, and features on-chip low-battery detection via auxiliary gain amplifier AO. Used in single-cell battery-powered instrumentation and portable electronics.
For engineers reviewing the ADP1073AR datasheet, ADP1073AR pinout, ADP1073AR application, or ADP1073AR equivalent, key selection criteria include its 1.0–12.6 V input range, 3.14–3.47 V output tolerance, 100 µA quiescent current in step-up mode, and SO-8 package compatibility with space-constrained portable designs.
Technical Context
The ADP1073AR implements a gated-oscillator control architecture with a 212 mV internal reference and comparator hysteresis (5–10 mV), enabling stable regulation without external compensation. Its dual-mode topology relies on externally accessible SW1 (collector) and SW2 (emitter) pins to configure step-up (SW2→GND) or step-down (SW1→VIN) operation.
Current limiting is user-adjustable via an external resistor between ILIM and VIN, with 400 mA default limit at 220 Ω. The auxiliary gain amplifier (SET/AO) provides programmable undervoltage lockout or linear post-regulation, sinking up to 100 µA at AO with 400–1000 V/V gain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4.5% (3.14–3.47 V); ensures stable logic supply for 3.3 V microcontrollers and sensors. |
| Input Voltage Range | 1.0–12.6 V in step-up mode; enables direct use of single alkaline/NiMH cells (1.0–1.5 V) or higher sources. |
| Quiescent Current | 100 µA (typ.) in step-up mode; extends battery life in intermittently active portable instruments. |
| Oscillator Frequency | 14–24 kHz (typ. 19 kHz); low-frequency switching reduces EMI and allows use of low-cost, high-inductance chokes. |
| Switch Current Limit | 400 mA (with 220 Ω ILIM-to-VIN resistor); protects internal 1 A bipolar transistor during overload or short-circuit events. |
| Package | SO-8; surface-mount footprint compatible with automated assembly and thermal management in compact PCB layouts. |
| Operating Temperature | 0°C to +70°C; validated for commercial-grade embedded systems including handheld test equipment. |
Pinout & Package
ADP1073AR is housed in an 8-lead Small Outline (SO-8) package with standard JEDEC MS-012AC dimensions (4.9 mm × 3.9 mm × 1.75 mm). Pin 1 is marked by a notch or dot; device is ESD-sensitive (HBM 4000 V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Current limit programming input | Connect to VIN for default 400 mA limit; add resistor to VIN to reduce switch current-critical for inductor sizing and thermal safety. |
| VIN | Main power input | Supplies internal circuitry and switch; accepts 1.0–12.6 V; reverse-battery tolerant to –0.4 V (SW2/GND grounded). |
| SW1 | Internal switch collector | In step-up: drives inductor; in step-down: connects to VIN-dual-role pin enables topology flexibility without external FETs. |
| SW2 | Internal switch emitter | In step-up: connects to GND; in step-down: drives inductor-must not drop more than one diode drop below ground. |
| GND | Analog and power ground reference | Common return for feedback, reference, and oscillator; requires low-impedance connection to minimize noise coupling. |
| AO | Auxiliary gain amplifier open-collector output | Sinks 100 µA max; used for low-battery flag or linear regulation-requires external pull-up for logic-level signaling. |
| SET | Non-inverting input of auxiliary gain block | Accepts resistor divider from VIN to set low-battery threshold; referenced internally to 212 mV. |
| FB/SENSE | Feedback input (fixed-voltage version) | Internally connected to laser-trimmed resistor network; connect directly to 3.3 V output-no external divider needed. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cell start-up capability | Regulates from 1.0 V input-enables use with depleted alkaline/NiMH cells in battery-backed instrumentation. |
| Topology flexibility | Configurable as boost, buck, or inverting converter using only SW1/SW2 pin routing-reduces BOM count across product variants. |
| Integrated current limiting | User-adjustable via single external resistor-eliminates need for sense resistors or external current-sense amplifiers. |
| Low-quiescent-current regulation | 100 µA IQ in step-up mode-preserves battery capacity in always-on, low-duty-cycle applications like sensor nodes. |
| On-chip low-battery detector | Programmable via SET pin and AO open-collector output-provides system-level voltage monitoring without extra ICs. |
Applications
| Hand-Held Inventory Computers | 4 mA–20 mA Loop Powered Instruments |
|---|---|
Use Scenario: Battery-powered barcode scanners operating from single AA/AAA cells with intermittent high-current decode bursts. IC Role / Device Role / Timing Role: Primary DC–DC regulator providing stable 3.3 V rail for MCU, display, and imaging sensor during active scan cycles. Use Value: 100 µA quiescent current extends runtime between charges; 1.0 V start-up ensures full functionality even with weak batteries. |
Use Scenario: Field-mounted pressure/temperature transmitters powered solely by industrial 4–20 mA current loop. IC Role / Device Role / Timing Role: Step-down converter generating local 3.3 V supply from loop-derived voltage (typically 12–36 V), enabling low-power sensor signal conditioning. Use Value: Wide 1.0–12.6 V input range accommodates loop voltage variation; SO-8 package fits tight enclosure constraints. |
| Laptop and Palmtop Computers | Battery Backup Supplies |
Use Scenario: Auxiliary power rails for real-time clocks, SRAM retention, or USB suspend logic during main system shutdown. IC Role / Device Role / Timing Role: Micropower backup regulator maintaining 3.3 V from coin cell or supercapacitor when main supply fails. Use Value: Guaranteed operation down to 1.0 V input preserves data integrity during deep discharge; low leakage supports >1-year shelf life. |
Use Scenario: Non-volatile memory backup in telecom base stations or industrial PLCs requiring >10-year hold-up time. IC Role / Device Role / Timing Role: Efficient step-up converter charging supercapacitors from 3.3 V system rail to 5.5 V storage voltage. Use Value: Internal 1 A switch handles high charge currents; adjustable current limit prevents capacitor inrush damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower DC–DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX630ESA+ | Fixed 3.3 V output, 1.5–16.5 V input, 120 µA IQ, SO-8 package; no adjustable current limit or AO output. | Lacks auxiliary gain amplifier and programmable current limit-unsuitable for low-battery detection or custom overcurrent protection. | Choose MAX630ESA+ only if AO functionality and ILIM adjustment are unnecessary and higher IQ is acceptable. |
| TPS61200DRCR | Adjustable 1.8–5.5 V output, 0.3–5.5 V input, 50 µA IQ, 1.2 A switch, 600 kHz switching, SON-10 package. | Higher frequency enables smaller magnetics but increases EMI sensitivity; requires external feedback resistors for 3.3 V setting. | Choose TPS61200DRCR for ultra-low IQ and compact size where board space is critical and EMI filtering can be added. |
Compared with MAX630ESA+ and TPS61200DRCR, the ADP1073AR uniquely combines single-cell start-up (1.0 V), integrated low-battery detection (AO/SET), and topology flexibility in SO-8-making it optimal for cost-sensitive, battery-constrained instrumentation where feature integration reduces component count.
Availability
ADP1073AR is available at Aetrix Electronics and suitable for hand-held inventory computers, 4 mA–20 mA loop powered instruments, laptop/palmtop auxiliary supplies, battery backup systems, and portable instrumentation requiring stable component supply with long-term manufacturability.
Supply support for ADP1073AR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing expertise spanning power management, precision conversion, and RF technologies.
The ADP1073AR belongs to Analog Devices' micropower DC–DC converter product line, engineered specifically for ultra-low-input-voltage, battery-operated applications where extended runtime and minimal external components are critical design requirements.
FAQ
What is the minimum input voltage required for ADP1073AR to regulate 3.3 V output?
The ADP1073AR regulates 3.3 V output from as low as 1.0 V input in step-up mode, verified across temperature (0°C to +70°C) and load conditions. At 1.25 V input, it delivers 40 mA; at 1.0 V input, it sustains 10 mA. This capability is enabled by its gated-oscillator architecture and low-threshold comparator referenced to 212 mV. The ADP1073AR datasheet specifies 1.15 V min under full-load conditions, but guarantees 1.0 V operation at reduced output current.
Can ADP1073AR be used in step-down (buck) configuration, and what are the key layout considerations?
Yes, ADP1073AR supports step-down operation by connecting SW1 to VIN and SW2 to the inductor-its dual-access switch terminals enable true buck topology without external FETs. Key layout considerations include minimizing SW2 loop area to reduce EMI, using low-ESR output capacitors (e.g., OS-CON or tantalum), and routing the ILIM resistor close to the pin to avoid noise coupling. The ADP1073AR's maximum duty cycle (72%) and 38 µs ON time constrain minimum input-to-output voltage ratios for stable regulation.
How does the AO output function in ADP1073AR, and what external components are needed for low-battery detection?
The AO output is an open-collector NPN transistor that sinks up to 100 µA. For low-battery detection, connect a resistor divider from VIN to GND with the junction at the SET pin; when VIN drops below the threshold (set by divider ratio relative to 212 mV internal reference), AO pulls low. An external pull-up resistor (e.g., 10 kΩ to 3.3 V) is required to generate a logic-high signal when battery is healthy. The ADP1073AR's AO response time and hysteresis are defined by internal gain block characteristics-not adjustable externally.
What is the purpose of the ILIM pin on ADP1073AR, and how is the current limit value calculated?
The ILIM pin sets the peak switch current limit by sensing voltage drop across an external resistor connected between ILIM and VIN. A 220 Ω resistor yields 400 mA limit, per Figure 4 in the ADP1073AR datasheet. The relationship is approximately linear: ILIM ≈ (VIN − 1.2 V) / RILIM. This limit protects the internal 1 A bipolar transistor during overload, short-circuit, or inductor saturation-critical for reliability in unattended portable devices using the ADP1073AR.
Is ADP1073AR pin-compatible with other members of the ADP1073 family, such as ADP1073AR-5 or ADP1073AR-12?
Yes, all ADP1073AR variants (ADP1073AR, ADP1073AR-3.3, ADP1073AR-5, ADP1073AR-12) share identical SO-8 pinouts and electrical interfaces. The only difference is internal laser-trimmed feedback resistors: ADP1073AR-3.3 is factory-set for 3.3 V, eliminating external resistors. This allows drop-in replacement across output voltages without PCB changes-provided the application's input/output voltage and current requirements align with each variant's specified performance.
ADP1073AR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP1073
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 0.212V
- Voltage - Output (Max):
- 24V
- Current - Output:
- -
- Frequency - Switching:
- 19kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP1073AR FAQ
1.How can I place an order for ADP1073AR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1073AR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADP1073AR reliable?
The price and inventory of ADP1073AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1073AR is usually 5 days.
3.What payment methods are accepted for ADP1073AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1073AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1073AR?
ADP1073AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1073AR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADP1073AR?
For technical support, including ADP1073AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1073AR requirements.
6.How does Aetrix verify that ADP1073AR is sourced from the original manufacturer or authorized distributors?
All ADP1073AR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADP1073AR meets industry standards.
7.What is the process for return or replacement of ADP1073AR?
All ADP1073AR units undergo pre-shipment inspection (PSI). If there is an issue with ADP1073AR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADP1073AR part is unused and in its original packaging.
Return procedure for ADP1073AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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