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Analog Devices Inc. ADP3605ARZ-R7
- Part No.:
- ADP3605ARZ-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP3605ARZ-R7.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,884
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Product details
Overview
ADP3605ARZ-R7 from Analog Devices is a regulated switched-capacitor voltage inverter IC that generates a stable negative output from a 3 V to 6 V positive input, delivering up to 120 mA with ±3% output accuracy and 250 kHz switching frequency. It operates without an inductor and supports adjustable output from −3 V to −6 V via external feedback resistors, making it suitable for portable instrumentation and battery-powered dual-rail systems.
For engineers reviewing the ADP3605ARZ-R7 datasheet, ADP3605ARZ-R7 pinout, ADP3605ARZ-R7 application, or ADP3605ARZ-R7 equivalent, key selection criteria include its regulated inverting topology, SOIC-8 package compatibility, shutdown current of 2 µA (typ), and absence of magnetic components-critical for space-constrained, low-noise, and EMI-sensitive designs.
Technical Context
The ADP3605ARZ-R7 implements a two-phase charge-pump architecture driven by an internal 500 kHz oscillator to produce a 250 kHz effective switching frequency, enabling compact external capacitor sizing. Its feedback-controlled regulation loop monitors VOUT via the VSENSE pin and maintains output stability across load and temperature variations.
It features integrated MOSFET switches, no-inductor operation, and logic-compatible shutdown control (SD pin) that reduces quiescent current to 2 µA typical. The device uses a fixed-frequency, non-overlapping clock to prevent shoot-through and ensure efficient charge transfer between CP and CO capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 120 mA max - sufficient to power op-amp rails, ADC references, or LCD bias in portable systems |
| Output Accuracy | ±3% - ensures stable negative rail for precision analog circuitry without post-regulation |
| Switching Frequency | 250 kHz nominal - enables use of small 4.7 µF ceramic or tantalum pump/output capacitors |
| Input Voltage Range | 3 V to 6 V - compatible with single-cell Li-ion, 3.3 V/5 V logic supplies, and USB-powered devices |
| Shutdown Current | 2 µA typical - extends battery life in always-on or intermittent-use portable instruments |
| Operating Temp | −40°C to +85°C - qualified for industrial and automotive-adjacent environments |
| Package | 8-Lead SOIC_N (R-8) - standard footprint with 1.27 mm pitch, compatible with automated assembly |
Pinout & Package
ADP3605ARZ-R7 is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with exposed pad not present and standard thermal resistance (θJA = 150°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP+) | Pump capacitor positive terminal | Connects to positive plate of charge pump capacitor; carries bidirectional high-frequency switching current |
| 2 (GND) | Device ground reference | Single-point return for VIN bypass, CO, CP, and feedback network; critical for ripple suppression |
| 3 (CP−) | Pump capacitor negative terminal | Connects to negative plate of charge pump capacitor; forms inversion path during phase 2 |
| 4 (SD) | Logic shutdown control input | TTL/CMOS-compatible enable: high = shutdown (2 µA IQ), low = active; must be grounded if unused |
| 5 (VSENSE) | Regulated output voltage sense | Feedback node for adjustable output; connects to resistor divider between VOUT and GND |
| 6 (NC) | No connect | Internally unconnected; must remain floating-no PCB trace or solder joint permitted |
| 7 (VOUT) | Regulated negative output | Delivers −3 V to −6 V output; requires ≥4.7 µF low-ESR capacitor to GND for ripple control |
| 8 (VIN) | Positive supply input | Accepts 3–6 V input; requires local 1 µF low-ESR bypass capacitor to GND near pin |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless inverting topology | Eliminates magnetic components, reducing EMI, board area, and BOM cost in space-limited designs |
| Adjustable regulated output | Set from −3 V to −6 V using single external resistor (e.g., 24 kΩ for −3.0 V), no trimming required |
| Low-noise regulated output | 75 mVpp ripple at 120 mA load with 4.7 µF CO - suitable for sensitive analog signal chains |
| Integrated non-overlapping clock | Prevents switch overlap and shoot-through, ensuring robust charge transfer and thermal safety |
| Logic-compatible shutdown | Standard TTL/CMOS interface allows direct connection to microcontroller GPIO without level-shifting |
Applications
| Portable Instrumentation | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscope front-ends requiring dual-rail analog circuitry from a single Li-ion cell. IC Role / Device Role / Timing Role: Generates stable −3.3 V rail for op-amps and ADC drivers while maintaining tight regulation under dynamic load. Use Value: Enables true bipolar signal acquisition without external DC/DC converters or discrete charge pumps, reducing size and power loss. |
Use Scenario: Wearable ECG/EEG sensors powered by coin-cell or small LiPo batteries needing low-quiescent, noise-immune negative bias. IC Role / Device Role / Timing Role: Provides regulated −5 V for precision instrumentation amplifiers with <2 µA shutdown current extending runtime. Use Value: Delivers clean, low-ripple negative supply essential for sub-µV-level biopotential measurement integrity. |
| Industrial PLC I/O Modules | Mobile Communication Receivers |
Use Scenario: DIN-rail mounted analog input modules operating from 24 V bus with local 5 V LDO, requiring isolated negative rail for signal conditioning. IC Role / Device Role / Timing Role: Supplies −5 V for programmable gain amplifiers and anti-aliasing filters in harsh industrial environments. Use Value: Maintains ±3% output accuracy over −40°C to +85°C ambient, supporting reliable operation without recalibration. |
Use Scenario: RF receiver front-ends in pagers and short-range radios where compact size and low EMI are mandatory. IC Role / Device Role / Timing Role: Generates −3 V bias for RF mixer diodes and low-noise amplifier stages from shared 3.3 V system rail. Use Value: 250 kHz fixed-frequency operation avoids interference with IF bands, and SOIC-8 footprint simplifies layout in dense RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated inverting charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed −5 V output; no adjustment; 100 mA max output; 100 kHz switching; requires external oscillator capacitor | Lacks VSENSE pin and output adjustability; lower current limits suitability for light-load bias only | Select when fixed −5 V and minimal external parts outweigh need for regulation flexibility |
| TPS60403DBVR | 150 mA output; ±1.5% accuracy; 500 kHz switching; integrated soft-start; higher IQ (25 µA shutdown) | Superior accuracy and current drive but higher quiescent current reduces battery life in ultra-low-power apps | Choose for tighter regulation and higher load capability where 23 µA higher shutdown current is acceptable |
Compared with MAX680ESA+ and TPS60403DBVR, the ADP3605ARZ-R7 uniquely balances adjustable output voltage, 120 mA capability, ±3% accuracy, and 2 µA shutdown current in an industry-standard SOIC-8 package-making it optimal for portable, battery-critical systems requiring design flexibility without sacrificing efficiency.
Availability
ADP3605ARZ-R7 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical sensors, and industrial I/O modules requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for SMT production.
Supply support for ADP3605ARZ-R7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers and manufacturing worldwide.
The ADP3605ARZ-R7 belongs to Analog Devices' switched-capacitor power management product line, engineered specifically for compact, inductor-free DC/DC conversion in portable and space-constrained applications where EMI, size, and battery life are critical.
FAQ
What is the minimum input voltage required for stable operation of the ADP3605ARZ-R7?
The ADP3605ARZ-R7 operates reliably down to 3.0 V input voltage across its full temperature range (−40°C to +85°C). At VIN = 3.0 V, it maintains regulation for outputs down to −3.0 V with ≤120 mA load, as verified in Figure 8 of the Rev. B datasheet. Below 3.0 V, regulation degrades and the device may cease switching.
Can the ADP3605ARZ-R7 generate −6 V output, and what resistor value is needed?
Yes, the ADP3605ARZ-R7 supports −6 V output using the formula R = 5.9 × |VOUT| kΩ (where VOUT is in volts). For −6 V, R = 5.9 × 6 = 35.4 kΩ - a standard 35.7 kΩ 1% resistor achieves −5.95 V, within ±3% accuracy. This configuration is validated in the Adjustable Regulated Output Voltage section (Page 10).
Is the NC pin (Pin 6) safe to leave unconnected on the ADP3605ARZ-R7 PCB layout?
Yes, Pin 6 is explicitly designated "No Connect" in Table 5 and the top-view diagram (Figure 3). It is internally unconnected and must remain floating-no trace, solder mask opening, or thermal pad should contact this pin. Connecting it risks undefined behavior or latch-up per Analog Devices' design guidance.
How does the ADP3605ARZ-R7 achieve ±3% output accuracy without external trimming?
The ADP3605ARZ-R7 achieves ±3% output accuracy using factory-trimmed internal resistors in its feedback amplifier, eliminating the need for external trimming or dual-resistor dividers. As stated in the Applications Information section (Page 10), "High accuracy on the adjustable output voltage is achieved with the use of precision trimmed internal resistors."
What is the maximum allowable output capacitance for the ADP3605ARZ-R7, and why?
The ADP3605ARZ-R7 does not specify a maximum CO value, but increasing capacitance beyond ~10 µF yields diminishing ripple reduction due to ESR dominance (see Figure 15). Recommended practice is 4.7 µF to 10 µF low-ESR ceramic or tantalum; larger values add cost and board area without meaningful improvement, and may impact startup time or stability if ESR falls outside the 0.05–0.3 Ω range.
ADP3605ARZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- -3V
- Voltage - Output (Max):
- -12V
- Current - Output:
- 120mA
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP3605ARZ-R7 FAQ
1.How can I place an order for ADP3605ARZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3605ARZ-R7 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 ADP3605ARZ-R7 reliable?
The price and inventory of ADP3605ARZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3605ARZ-R7 is usually 5 days.
3.What payment methods are accepted for ADP3605ARZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3605ARZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3605ARZ-R7?
ADP3605ARZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3605ARZ-R7 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 ADP3605ARZ-R7?
For technical support, including ADP3605ARZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3605ARZ-R7 requirements.
6.How does Aetrix verify that ADP3605ARZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADP3605ARZ-R7 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 ADP3605ARZ-R7 meets industry standards.
7.What is the process for return or replacement of ADP3605ARZ-R7?
All ADP3605ARZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3605ARZ-R7, 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 ADP3605ARZ-R7 part is unused and in its original packaging.
Return procedure for ADP3605ARZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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