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Analog Devices Inc. ADP1173AR-12
- Part No.:
- ADP1173AR-12
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1173AR-12.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,465
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Product details
Overview
ADP1173AR-12 from Analog Devices is a micropower step-up/step-down switching regulator IC with fixed 12 V output, internal 1 A power switch, 2.0–30 V input range, and 250 µA typical quiescent current in boost mode. It operates in both buck and boost topologies for portable DC-DC conversion, supporting applications such as 9 V to 12 V or 12 V to 5 V converters.
For engineers reviewing the ADP1173AR-12 datasheet, ADP1173AR-12 pinout, ADP1173AR-12 application, or ADP1173AR-12 equivalent, key selection criteria include its dual-mode topology support, on-chip current limit adjustability via ILIM, integrated 1.245 V reference, low-noise gated-oscillator (24 kHz typical), and SO-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The ADP1173AR-12 implements a gated-oscillator control architecture with comparator-based feedback referencing an internal 1.245 V bandgap. Its dual-collector/emitter switch configuration enables reconfigurable step-up (SW2 to GND, SW1 to inductor) or step-down (SW1 to VIN, SW2 to inductor) operation without external FETs.
It integrates a user-accessible auxiliary gain block (SET/AO pins) for low-battery detection or UVLO functions, and supports adjustable current limiting via resistor between ILIM and VIN - enabling precise peak switch current control up to 1.5 A in step-up or 650 mA in step-down mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.0 V ±5% (guaranteed 11.4–12.6 V at full load) |
| Input Voltage Range | 2.0–12.6 V (step-up), 2.0–30 V (step-down); supports single-cell Li-ion to multi-cell alkaline inputs |
| Quiescent Current | 250 µA typical in boost mode at +25°C; enables >1-year battery life in low-duty-cycle portable systems |
| Oscillator Frequency | 24 kHz typical (16–32 kHz range); balances efficiency, EMI, and inductor size for portable SMPS |
| Internal Power Switch | Integrated NPN transistor rated 1.5 A max; eliminates external switch, reduces BOM count and layout area |
| Current Limit Accuracy | 400 mA typical with 220 Ω ILIM-to-VIN resistor; provides overcurrent protection without sense resistor loss |
| Reference Voltage | 1.245 V ±3.5% (1.20–1.30 V); sets output accuracy and enables stable feedback across temperature |
Pinout & Package
ADP1173AR-12 is housed in an 8-lead SOIC (SO-8) package with standard 1.27 mm pitch, compatible with automated assembly and IPC-7351B land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - AO | Auxiliary gain amplifier output | Open-collector NPN capable of sinking 100 µA; used for low-battery flag or linear regulator control |
| 2 - ILIM | Current limit programming input | Resistor-connected node to set peak switch current; 220 Ω yields 400 mA limit |
| 3 - SW1 | Power switch collector | In step-up: connects to inductor; in step-down: connects to VIN - defines topology configuration |
| 4 - GND | Analog and power ground reference | Common return for feedback, reference, and oscillator; requires low-impedance PCB plane |
| 5 - VIN | Main power supply input | Accepts 2.0–30 V; supplies internal circuitry and switch driver; must be bypassed with ≥4.7 µF ceramic |
| 6 - SW2 | Power switch emitter | In step-up: connects to GND; in step-down: connects to inductor - complementary to SW1 for topology flexibility |
| 7 - SET | Auxiliary amplifier non-inverting input | Configures low-battery threshold via resistor divider from VIN; referenced to internal 1.245 V |
| 8 - FB/SENSE | Feedback voltage sensing input | Direct connection to output in fixed-voltage versions; internally tied to laser-trimmed resistive divider for 12 V regulation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology support | Single IC enables both step-up (boost) and step-down (buck) configurations via SW1/SW2 pin routing - reduces design complexity and inventory |
| On-chip 1.245 V reference | Guaranteed 1.20–1.30 V tolerance enables accurate 12 V output without external precision reference or trimming |
| User-adjustable current limit | ILIM pin accepts resistor to VIN to scale peak switch current from 400 mA to 1.5 A - simplifies short-circuit protection tuning |
| Low-quiescent-current gated oscillator | 250 µA typical IQ in boost mode at +25°C ensures minimal battery drain during light-load or standby operation |
| Integrated auxiliary gain block | SET/AO pins provide configurable low-battery detector or UVLO function without external op-amp - saves board space and cost |
Applications
| Portable Instrument Power | LCD Bias Generation |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by two AA alkaline cells (3 V) requiring stable 12 V for analog front-end op-amps and ADC references. IC Role / Device Role / Timing Role: ADP1173AR-12 operates in step-up mode to generate regulated 12 V from 2.0–3.6 V input, using internal switch and gated oscillator for high light-load efficiency. Use Value: Delivers 100 mA at 12 V with <250 µA quiescent current, extending battery life beyond 18 months in intermittent-use instruments. |
Use Scenario: Monochrome LCD modules in industrial HMIs needing +12 V and –5 V bias rails from a single 5 V system supply. IC Role / Device Role / Timing Role: ADP1173AR-12 configured in positive-to-negative inverting mode (SW2 to GND, SW1 to inductor) generates –5 V; same IC used in boost mode for +12 V rail. Use Value: Eliminates need for separate inverting and boosting ICs - reduces component count, PCB area, and BOM cost by 35% versus discrete solutions. |
| Flash Memory VPP Generator | Cellular Phone Peripheral Supply |
Use Scenario: Embedded microcontrollers in legacy flash memory systems requiring 12 V programming voltage (VPP) during firmware updates. IC Role / Device Role / Timing Role: ADP1173AR-12 boosts 3.3 V system rail to precisely regulated 12 V output, with built-in hysteresis ensuring stable regulation during transient VPP loads. Use Value: Meets JEDEC VPP tolerance (±5%) with no external feedback resistors - simplifies compliance testing and reduces qualification time. |
Use Scenario: Feature phone camera modules requiring isolated 12 V bias for autofocus actuators, powered from shared 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: ADP1173AR-12 operates in step-up mode with ILIM resistor limiting peak current to 600 mA, preventing battery sag during actuator pulse events. Use Value: Provides 12 V at 150 mA with <100 mV output ripple (with OS-CON capacitor), meeting camera module EMI and noise immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX738AESA+ | Fixed 12 V output, 2.7–16.5 V input, 100 µA IQ, external MOSFET required | Lacks integrated switch; needs external high-side N-channel FET and gate driver | Select when higher efficiency (>85%) at >200 mA is required and board space allows external FET layout |
| TPS61040DRVR | Adjustable 1.8–28 V output, 2.7–5.5 V input, 26 µA IQ, integrated 0.5 A switch | Lower max output voltage and switch current; not rated for 12 V fixed-output precision | Prefer for ultra-low-IQ applications below 50 µA where 12 V output can be trimmed externally with tight tolerance |
Compared with MAX738AESA+ and TPS61040DRVR, ADP1173AR-12 uniquely combines fixed 12 V accuracy, 1 A integrated switch, wide 2–30 V input, and dual-mode topology - making it optimal for cost-sensitive, space-constrained portable systems requiring robust 12 V generation without external power devices.
Availability
ADP1173AR-12 is available at Aetrix Electronics and suitable for portable instrument power, LCD bias generation, flash memory VPP supply, and cellular phone peripheral supply requiring stable component supply across long-lifecycle industrial and consumer programs.
Supply support for ADP1173AR-12 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, serving precision instrumentation, industrial automation, and communications markets since 1965.
The ADP1173 family was designed specifically for micropower, dual-mode DC-DC conversion in battery-operated portable equipment - emphasizing ultra-low quiescent current, topology flexibility, and minimal external component count.
FAQ
What is the guaranteed output voltage tolerance for ADP1173AR-12?
The ADP1173AR-12 delivers a fixed 12.0 V output with guaranteed tolerance of ±5% (11.4 V to 12.6 V) under full-load conditions across 0°C to +70°C operating temperature. This specification is ensured by on-die laser-trimmed resistive feedback networks, eliminating external resistor matching errors and drift-related inaccuracies that affect adjustable regulators.
Can ADP1173AR-12 operate in step-down mode from a 24 V input?
Yes, ADP1173AR-12 supports step-down operation from input voltages up to 30 V. When configured with SW1 connected to VIN and SW2 driving the inductor, it regulates 12 V output from 24 V input. However, maximum switch current must be limited to 650 mA in step-down mode - use a resistor between ILIM and VIN (e.g., ~180 Ω per Figure 5) to prevent saturation and thermal overload at high input voltages.
Does ADP1173AR-12 require external feedback resistors?
No, ADP1173AR-12 does not require external feedback resistors. As a fixed-output variant, it integrates laser-trimmed internal resistors connecting the FB/SENSE pin to the 1.245 V reference - enabling direct connection of FB to the output node. This eliminates resistor tolerance errors, temperature drift, and PCB layout sensitivity associated with external dividers.
What is the purpose of the AO and SET pins on ADP1173AR-12?
The AO (auxiliary output) and SET pins on ADP1173AR-12 form an uncommitted gain block: SET is the non-inverting input referenced to the internal 1.245 V reference, and AO is an open-collector NPN output sinking up to 100 µA. This pair enables low-battery detection (e.g., flagging <3.0 V input), under-voltage lockout, or error amplification - all without external op-amps or comparators.
Is ADP1173AR-12 pin-compatible with other ADP1173 variants?
Yes, ADP1173AR-12 is fully pin-compatible with all ADP1173 family members in SO-8 packaging, including ADP1173AR, ADP1173AR-3.3, and ADP1173AR-5. Pin functions, electrical characteristics, and layout footprints are identical - only the internal feedback network differs. This enables drop-in replacement across output voltage variants during design iteration or BOM optimization.
ADP1173AR-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP1173AR-12 FAQ
1.How can I place an order for ADP1173AR-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1173AR-12 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 ADP1173AR-12 reliable?
The price and inventory of ADP1173AR-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1173AR-12 is usually 5 days.
3.What payment methods are accepted for ADP1173AR-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1173AR-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1173AR-12?
ADP1173AR-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1173AR-12 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 ADP1173AR-12?
For technical support, including ADP1173AR-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1173AR-12 requirements.
6.How does Aetrix verify that ADP1173AR-12 is sourced from the original manufacturer or authorized distributors?
All ADP1173AR-12 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 ADP1173AR-12 meets industry standards.
7.What is the process for return or replacement of ADP1173AR-12?
All ADP1173AR-12 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1173AR-12, 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 ADP1173AR-12 part is unused and in its original packaging.
Return procedure for ADP1173AR-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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