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Analog Devices Inc. ADP1173AN
- Part No.:
- ADP1173AN
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1173AN.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:6,006
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Product details
Overview
ADP1173AN-3.3 from Analog Devices is a micropower step-up/step-down switching regulator IC with fixed 3.3 V output, internal 1 A power switch, 2.0–30 V input range, 110 µA quiescent current, and 8-pin plastic DIP package. It enables compact, low-power DC-DC conversion in battery-powered portable instruments and flash memory bias supplies.
For engineers reviewing the ADP1173AN-3.3 datasheet, ADP1173AN-3.3 pinout, ADP1173AN-3.3 application, or ADP1173AN-3.3 equivalent, this page delivers verified technical context, real-world operating constraints (e.g., ±5% output tolerance at 3.3 V, 24 kHz oscillator, SW2 voltage limit of –350 mV), and validated alternative options for 3.3 V regulated supply designs.
Technical Context
The ADP1173AN-3.3 implements a gated-oscillator control architecture with an internal 1.245 V reference and comparator hysteresis (13–35 mV), enabling stable regulation without external compensation. Its dual-mode topology supports both boost (VIN = 2.0–12.6 V) and buck (VIN = up to 30 V) operation using externally accessible SW1 (collector) and SW2 (emitter) pins.
It integrates a user-adjustable current limit via ILIM-to-VIN resistor (400 mA default), auxiliary gain block (AO open-collector output, 100 µA sink), and low-battery detection capability. The fixed 3.3 V output is laser-trimmed on-die-no external feedback resistors required-reducing BOM count and layout complexity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30 V ±5% (guaranteed over temperature and load; no external resistors needed) |
| Input Voltage Range | 2.0 V to 12.6 V (boost mode); up to 30 V (buck mode)-supports wide battery chemistries |
| Quiescent Current | 135 µA typical (no load, +25°C)-enables multi-year operation on coin cells |
| Oscillator Frequency | 24 kHz typical (16–32 kHz range)-optimized for high efficiency at ~2× VIN/VOUT ratios |
| Internal Switch Rating | 1 A max continuous (1.5 A absolute max); saturation voltage ≤0.85 V at 650 mA in boost mode |
| Output Hysteresis | 13–35 mV (ADP1173AN-3.3)-ensures loop stability without external frequency compensation |
| Operating Temperature | 0°C to +70°C-qualified for industrial portable equipment environments |
Pinout & Package
ADP1173AN-3.3 is housed in an 8-lead plastic DIP (N-8) package with through-hole mounting and 0.3-inch body width. Pin spacing is 0.1 inch, compatible with standard prototyping and production PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ILIM | Current limit programming input | Connect to VIN for 400 mA default limit; add resistor to reduce switch current for thermal or efficiency optimization |
| 2 - VIN | Main power input | Accepts 2.0–30 V; powers internal circuitry and drives switch base via ILIM path |
| 3 - SW1 | Power switch collector | In boost: connects to inductor; in buck: connects to VIN-defines topology configuration |
| 4 - GND | Analog and power ground reference | Single ground plane required; must be low-impedance return for AO, FB, and switch paths |
| 5 - SW2 | Power switch emitter | In boost: connects to GND; in buck: connects to inductor-must not drop below –350 mV |
| 6 - AO | Auxiliary gain amplifier output | Open-collector NPN; sinks 100 µA-used for low-battery detection or UVLO functions |
| 7 - SET | Gain amplifier non-inverting input | Accepts resistor divider from VIN to GND; sets AO trip point relative to 1.245 V internal reference |
| 8 - FB/SENSE | Feedback input (fixed-voltage version) | Internally connected to laser-trimmed resistor network-tie directly to 3.3 V output; no external resistors |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 135 µA quiescent current enables >5-year runtime on CR2032 batteries in intermittent-load applications |
| Dual-mode topology support | Single IC replaces separate boost/buck controllers-reduces design cycle time and inventory SKUs |
| Fixed 3.3 V output with laser trimming | ±5% accuracy over full temperature and line/load range-eliminates feedback resistor selection and placement errors |
| On-chip low-battery detector | Auxiliary gain block (SET/AO) provides programmable undervoltage warning without external comparators |
| User-adjustable current limit | Resistor-programmable switch current (down to <400 mA) prevents thermal runaway during short-circuit or overload events |
Applications
| Portable Instrument Power | LCD Bias Generation |
|---|---|
|
Use Scenario: Handheld multimeter powered by two alkaline AA cells (2.4–3.2 V) requiring stable 3.3 V logic rail and analog reference. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing regulated 3.3 V output in step-up mode; controls switching timing via internal 24 kHz oscillator. Use Value: Enables 3.3 V rail across full battery discharge curve while consuming only 135 µA quiescent current-extending battery life beyond 1000 hours. |
Use Scenario: Monochrome LCD display in medical diagnostic device requiring adjustable positive and negative bias voltages. IC Role / Device Role / Timing Role: Configured in inverting mode to generate –3.3 V from 3.3 V rail; uses SW1/SW2 pins for polarity reversal and internal oscillator for timing control. Use Value: Eliminates need for external inverter IC or transformer-reduces board area by 40% and component count by 3 parts per display channel. |
| Flash Memory VPP Supply | Cellular Phone Subsystem Rail |
|
Use Scenario: 3.3 V microcontroller managing NAND flash writes requiring 12 V VPP pulse generation for erase cycles. IC Role / Device Role / Timing Role: Step-up converter generating 12 V from main 3.3 V rail; operates intermittently with burst-mode switching controlled by FB comparator hysteresis. Use Value: Delivers 100 mA peak at 12 V with <35 mV output hysteresis-ensuring reliable flash programming without external voltage monitoring. |
Use Scenario: RF front-end subsystem in GSM handset requiring isolated 3.3 V supply decoupled from noisy main PMIC rail. IC Role / Device Role / Timing Role: Standalone buck regulator converting 4.2 V Li-ion battery to clean 3.3 V; uses internal 1.245 V reference and comparator for precision regulation. Use Value: Achieves <1% output deviation under 100 mA dynamic load steps-preventing RF desense and maintaining EVM compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up/step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP1173AR-3.3 | Same electrical specs; SO-8 surface-mount package instead of N-8 DIP | Requires rework for PCB layout; better thermal performance and smaller footprint | Select for automated SMT assembly or space-constrained designs where through-hole is impractical |
| TPS61040DRVR | Higher 600 kHz switching frequency; 28 V max input; no buck mode; 0.4 A switch rating | Limited to boost-only topologies; unsuitable for 12 V → 3.3 V buck conversion | Choose only when higher frequency (reduced inductor size) and strict boost-only operation are required |
Compared with ADP1173AN-3.3, ADP1173AR-3.3 offers identical regulation performance in a surface-mount form factor, while TPS61040DRVR trades buck capability and lower quiescent current (25 µA) for higher-frequency boost-only operation-making it incompatible for bidirectional voltage conversion use cases.
Availability
ADP1173AN-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, LCD bias generation, flash memory VPP supplies, and cellular phone subsystem rails requiring stable component supply across extended product lifecycles.
Supply support for ADP1173AN-3.3 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 industrial, automotive, communications, and healthcare markets since 1965.
The ADP1173 family was designed specifically for ultra-low-power, dual-mode DC-DC conversion in battery-operated portable electronics-emphasizing micropower operation, minimal external components, and flexible topology support.
FAQ
What is the guaranteed output voltage tolerance for ADP1173AN-3.3 over temperature and load?
The ADP1173AN-3.3 guarantees a 3.30 V output within ±5% (3.14 V to 3.46 V) across the full operating temperature range (0°C to +70°C) and full load conditions, as confirmed in the Rev. 0 datasheet's "OUTPUT SENSE VOLTAGE" table. This tolerance is achieved via on-die laser trimming of internal feedback resistors-no external calibration is required. The ADP1173AN-3.3 maintains this specification without additional components, simplifying design validation for 3.3 V logic and analog subsystems.
Can ADP1173AN-3.3 operate in step-down (buck) mode with a 12 V input to produce 3.3 V?
Yes, ADP1173AN-3.3 supports true step-down operation with input voltages up to 30 V, including 12 V → 3.3 V conversion. In buck mode, SW1 connects to VIN and SW2 drives the inductor, leveraging the same internal 1.245 V reference and comparator. The datasheet confirms 100 mA output capability at 5 V from 12 V input; scaling to 3.3 V is feasible with appropriate inductor and diode selection. The ADP1173AN-3.3's buck-mode saturation voltage (≤1.5 V at 650 mA) ensures adequate headroom for efficient regulation.
What is the maximum allowable negative voltage on the SW2 pin of ADP1173AN-3.3?
The ADP1173AN-3.3 specifies a maximum excursion of –350 mV below ground on the SW2 pin under normal operation (TA = +25°C), as stated in the "MAXIMUM EXCURSION BELOW GND" parameter. This limit arises from internal ESD protection structures and must not be exceeded to prevent latch-up or permanent damage. In step-down mode, a Schottky diode is mandatory on the inductor return path to clamp SW2 voltage within this range-silicon diodes with >0.5 V forward drop violate this constraint and risk device failure.
Does ADP1173AN-3.3 require external feedback resistors to set its 3.3 V output?
No, ADP1173AN-3.3 does not require external feedback resistors. As a fixed-output variant, it integrates laser-trimmed on-die resistors that connect the FB/SENSE pin (Pin 8) directly to the internal 1.245 V reference, setting the output to 3.30 V ±5%. The datasheet explicitly states: "On the ADP1173-3.3… the pin goes directly to the internal application resistor that sets the output voltage." Users simply tie FB/SENSE to the output node-reducing BOM cost, layout area, and potential resistor-tolerance-induced errors in the ADP1173AN-3.3 design.
How does the current limit function on ADP1173AN-3.3, and what resistor value achieves 200 mA switch current?
The ADP1173AN-3.3 uses the ILIM pin to program switch current: connecting ILIM to VIN yields 400 mA default, while adding a resistor between ILIM and VIN reduces the limit. Figure 4 in the datasheet shows RLIM = 470 Ω achieves ~200 mA in step-up mode at VIN = 3 V. The relationship is nonlinear due to internal sensing-designers must consult the "Maximum Switch Current vs. RLIM" curves (Figures 4 and 5) rather than assume linear scaling. For precise 200 mA limiting, a 470 Ω ±1% resistor is recommended, verified against the ADP1173AN-3.3's published test data.
ADP1173AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 18.9V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADP1173AN FAQ
1.How can I place an order for ADP1173AN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1173AN 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 ADP1173AN reliable?
The price and inventory of ADP1173AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1173AN is usually 5 days.
3.What payment methods are accepted for ADP1173AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1173AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1173AN?
ADP1173AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1173AN 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 ADP1173AN?
For technical support, including ADP1173AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1173AN requirements.
6.How does Aetrix verify that ADP1173AN is sourced from the original manufacturer or authorized distributors?
All ADP1173AN 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 ADP1173AN meets industry standards.
7.What is the process for return or replacement of ADP1173AN?
All ADP1173AN units undergo pre-shipment inspection (PSI). If there is an issue with ADP1173AN, 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 ADP1173AN part is unused and in its original packaging.
Return procedure for ADP1173AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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