My Inquiry
My Account
Analog Devices Inc. ADP1108AN
- Part No.:
- ADP1108AN
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1108AN.pdf
- Description:
- IC REG BUCK BOOST ADJ 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:14,184
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADP1108AN-3.3 from Analog Devices is a micropower step-up/step-down DC-DC converter IC with fixed 3.3 V output, internal 1 A power switch, programmable current limit, and auxiliary gain block for low-battery detection. It operates from 2.0 V to 30 V input, delivers up to 300 mA in step-down mode, and consumes only 90 µA quiescent current at no load - ideal for battery-powered portable instruments and LCD bias generation.
For engineers reviewing the ADP1108AN-3.3 datasheet, ADP1108AN-3.3 pinout, ADP1108AN-3.3 application, or ADP1108AN-3.3 equivalent, key selection considerations include its dual-mode topology support, 3.3 V ±3.5% output tolerance at full load, 19 kHz oscillator frequency, 8-pin PDIP package, and integrated comparator with 1.245 V reference for system monitoring functions.
Technical Context
The ADP1108AN-3.3 implements a gated-oscillator control architecture with internal 1.245 V reference and hysteresis-stabilized feedback loop, enabling stable regulation without external compensation. Its dual-access power switch (SW1 collector, SW2 emitter) supports both boost and buck configurations using minimal external components.
It integrates an uncommitted auxiliary gain block (SET/AO pins) with 400–1000 V/V gain and open-collector output capable of sinking 100 µA - configurable as under-voltage lockout, linear post-regulator, or low-battery detector. Current limiting is resistor-programmable via ILIM pin with –0.3 %/°C temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3.5% (3.13–3.46 V) - tightly regulated for logic supply compatibility |
| Input Voltage Range | 2.0–12.6 V (step-up), up to 30 V (step-down) - supports single-cell Li-ion to multi-cell alkaline inputs |
| Quiescent Current | 90 µA at no load - enables >1-year battery life in always-on sensor nodes |
| Oscillator Frequency | 14–25 kHz typical (19 kHz nominal) - balances efficiency and EMI for low-noise portable designs |
| Switch Current Limit | Programmable up to 500 mA via ILIM-to-VIN resistor - prevents thermal runaway during overload |
| Power Switch Rating | Internal 1 A bipolar transistor with 0.5–1.0 V saturation voltage - supports high-efficiency discrete inductor-based topologies |
| Comparator Trip Point | 1.245 V ±0.045 V - enables precise low-battery detection when used with SET/AO gain block |
Pinout & Package
ADP1108AN-3.3 is housed in an 8-pin plastic DIP (N-8) package with 0.3-inch width and through-hole mounting. Pin spacing follows standard 0.1-inch grid; thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Current limit programming input | Resistor tie to VIN sets switch current threshold; 220 Ω yields 500 mA limit |
| VIN | Main power input | Supplies internal circuitry and powers external inductor; accepts 2.0–30 V |
| SW1 | Power switch collector | In step-up: drives inductor; in step-down: connects to input rail |
| SW2 | Power switch emitter | In step-up: connects to GND; in step-down: drives inductor - must not go below –350 mV |
| FB / SENSE | Feedback / voltage sense input | Internally connected to laser-trimmed resistive divider for fixed 3.3 V output |
| SET | Auxiliary amplifier non-inverting input | Accepts resistor divider from VIN for low-battery threshold setting |
| AO | Auxiliary gain block output | Open-collector NPN output sinking up to 100 µA - used for UVLO or alarm signaling |
| GND | Analog and power ground reference | Common return path for internal circuitry, feedback, and gain block |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology support | Single IC configures as boost (VIN < VOUT) or buck (VIN > VOUT) with same external parts |
| Integrated low-battery detector | SET/AO gain block + 1.245 V reference enables accurate voltage monitoring without extra IC |
| Programmable current limiting | Single resistor on ILIM pin adjusts peak switch current from default to 500 mA |
| Ultra-low quiescent consumption | 90 µA shutdown current extends battery life in intermittent-use applications |
| Laser-trimmed fixed output | On-chip precision resistors ensure 3.3 V output accuracy without external feedback network |
Applications
| Portable Medical Sensors | LCD Bias Generation |
|---|---|
Use Scenario: Powering low-power glucose meters and pulse oximeters from two AA cells. IC Role / Device Role / Timing Role: Step-down regulator converting 3 V battery to stable 3.3 V MCU supply while monitoring battery depletion via AO output. Use Value: 90 µA quiescent current enables multi-year operation; fixed 3.3 V output eliminates calibration drift from external resistor tolerances. |
Use Scenario: Generating positive and negative bias voltages for monochrome LCD displays in handheld test equipment. IC Role / Device Role / Timing Role: Configured in inverting mode to produce –5 V from +5 V rail, using SW1/SW2 for bidirectional switch control. Use Value: Internal 1 A switch handles peak currents during display refresh; 19 kHz switching avoids audible noise in sensitive analog front-ends. |
| Industrial Data Loggers | Wireless Sensor Node Power |
Use Scenario: Regulating 12 V solar-charged battery down to 3.3 V for microcontroller and RF transceiver. IC Role / Device Role / Timing Role: Buck-mode DC-DC converter with ILIM resistor limiting inrush during cold-start conditions. Use Value: 30 V max input withstands transient surges; 0.5 V switch saturation minimizes conduction loss at 300 mA load. |
Use Scenario: Supplying 3.3 V to BLE SoC and environmental sensors from coin-cell batteries. IC Role / Device Role / Timing Role: Boost converter stepping up 2.0–2.2 V coin-cell voltage to regulated 3.3 V output with hysteresis-stabilized loop. Use Value: 2.0 V startup capability ensures operation until battery reaches end-of-life; 14–25 kHz frequency avoids interference with 2.4 GHz ISM band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX630ESA+ | Fixed 5 V output only; 100 µA quiescent current; no auxiliary gain block | Lacks programmable current limit and low-battery detection capability | Choose when only 5 V output is required and system-level monitoring is handled externally |
| TPS61200DRCR | Adjustable output (0.9–5.5 V); 55 µA quiescent current; integrated synchronous rectifier | Higher efficiency in light-load conditions but requires external feedback resistors for 3.3 V | Prefer for ultra-low-power applications where adjustable output and tighter regulation are critical |
Compared with MAX630ESA+ and TPS61200DRCR, ADP1108AN-3.3 uniquely combines fixed 3.3 V accuracy, dual-mode topology flexibility, and on-chip gain block functionality - making it optimal for cost-sensitive, space-constrained portable systems requiring integrated monitoring.
Availability
ADP1108AN-3.3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, LCD bias generation, and wireless sensor node power requiring stable component supply across extended production lifecycles.
Supply support for ADP1108AN-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 ADP1108 product line was designed specifically for micropower, multi-topology DC-DC conversion in battery-operated portable electronics - emphasizing ultra-low IQ, integrated protection features, and minimal external component count.
FAQ
What is the maximum output current capability of the ADP1108AN-3.3 in step-down mode?
The ADP1108AN-3.3 can deliver up to 300 mA at 3.3 V from a 9 V input in step-down configuration, as specified in the General Description. This assumes proper inductor selection (e.g., 150 µH, 1 A saturation rating) and thermal management. At lower input voltages like 5 V, output current is limited by switch duty cycle and internal current limit - typically 150–200 mA under continuous load.
Does the ADP1108AN-3.3 require external feedback resistors to set the 3.3 V output?
No, the ADP1108AN-3.3 does not require external feedback resistors. It incorporates laser-trimmed internal resistors that fix the output to 3.3 V - the FB/SENSE pin connects directly to the output. External resistors are only needed for the adjustable ADP1108AN version or for custom thresholds in the auxiliary gain block circuit.
Can the ADP1108AN-3.3 be used in a step-up (boost) configuration?
Yes, the ADP1108AN-3.3 supports step-up operation from inputs as low as 2.0 V to generate its fixed 3.3 V output. In boost mode, SW2 connects to GND and SW1 drives the inductor. The device starts up from 1.8 V and maintains regulation across the full 2.0–12.6 V input range specified for boost applications.
What is the purpose of the AO and SET pins on the ADP1108AN-3.3?
The AO (auxiliary output) and SET (auxiliary input) pins form an uncommitted gain block with 400–1000 V/V gain and open-collector output. When a resistor divider from VIN to GND is connected to SET, AO sinks current below a user-defined low-battery threshold - enabling UVLO, battery monitoring, or system reset functions without additional ICs.
Is the ADP1108AN-3.3 pin-compatible with other variants in the ADP1108 family?
Yes, all ADP1108 variants - including ADP1108AN, ADP1108AN-3.3, ADP1108AN-5, and ADP1108AN-12 - share identical 8-pin PDIP (N-8) pinouts and electrical interfaces. Only the internal feedback resistor network differs; all other pin functions, timing, and control behavior remain consistent across the family.
ADP1108AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP1108
- 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):
- 23.4V
- Current - Output:
- -
- Frequency - Switching:
- 19kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADP1108AN FAQ
1.How can I place an order for ADP1108AN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1108AN 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 ADP1108AN reliable?
The price and inventory of ADP1108AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1108AN is usually 5 days.
3.What payment methods are accepted for ADP1108AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1108AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1108AN?
ADP1108AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1108AN 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 ADP1108AN?
For technical support, including ADP1108AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1108AN requirements.
6.How does Aetrix verify that ADP1108AN is sourced from the original manufacturer or authorized distributors?
All ADP1108AN 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 ADP1108AN meets industry standards.
7.What is the process for return or replacement of ADP1108AN?
All ADP1108AN units undergo pre-shipment inspection (PSI). If there is an issue with ADP1108AN, 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 ADP1108AN part is unused and in its original packaging.
Return procedure for ADP1108AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADP1108AN Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
