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Analog Devices Inc. ADP3605ARU-3-REEL7
- Part No.:
- ADP3605ARU-3-REEL7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADP3605ARU-3-REEL7.pdf
- Description:
- IC SW CAP/INV -3V .12A 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,630
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Product details
Overview
ADP3605ARU-3-REEL7 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. It delivers up to 120 mA output current with ±3% regulation accuracy, operates at 250 kHz switching frequency, and uses no inductor-enabling compact, low-EMI power conversion in space-constrained portable systems.
For engineers reviewing the ADP3605ARU-3-REEL7 datasheet, ADP3605ARU-3-REEL7 pinout, ADP3605ARU-3-REEL7 application, or ADP3605ARU-3-REEL7 equivalent, key selection criteria include its adjustable −3 V to −6 V regulated output range, 2 µA shutdown current, 8-lead SOIC package, and compatibility with low-ESR ceramic/tantalum pump and output capacitors.
Technical Context
The ADP3605ARU-3-REEL7 implements a two-phase switched-capacitor topology driven by an internal 500 kHz oscillator, producing a 250 kHz effective charge-transfer rate. Its feedback loop regulates output voltage via external resistor divider connected between VSENSE and VOUT, enabling precise adjustment without trimming.
It features integrated switch control logic with overlap prevention between S1–S2 and S3–S4 phases, low-impedance internal switches (9 Ω open-loop output resistance), and TTL/CMOS-compatible shutdown control on Pin 4. The device operates across −40°C to +85°C and requires no inductor, distinguishing it from inductive DC/DC inverters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 120 mA max - supports moderate-power analog rails and dual-supply peripherals without external boost stages. |
| Output Regulation Accuracy | ±3% - ensures stable biasing for op-amps, ADC references, and RF front-end circuitry under load and temperature variation. |
| Switching Frequency | 250 kHz nominal - enables use of small 4.7 µF ceramic/tantalum pump and output capacitors; reduces EMI compared to lower-frequency charge pumps. |
| Shutdown Current | 2 µA typical - extends battery life in standby mode for pagers, portable instruments, and mobile accessories. |
| Input Voltage Range | 3 V to 6 V - compatible with single-cell Li-ion (3.0–4.2 V), 3.3 V logic rails, and 5 V USB-powered systems. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
| Package | 8-Lead SOIC_N (R-8) - surface-mount, JEDEC MS-012-AA compliant, 5.0 mm × 4.0 mm footprint with standard reflow profile. |
Pinout & Package
ADP3605ARU-3-REEL7 is housed in an 8-lead SOIC_N (R-8) package with standard gull-wing leads, 1.27 mm pitch, and exposed pad not present. Thermal performance is characterized by θJA = 150°C/W on standard FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP+) | Pump capacitor positive terminal | Connects to positive plate of charge pump capacitor; carries bidirectional 2× load current pulses during switching phase. |
| 2 (GND) | Device ground reference | Single-point ground connection for VIN bypass, CO, CP, and VSENSE return; critical for ripple suppression and regulation stability. |
| 3 (CP−) | Pump capacitor negative terminal | Connects to negative plate of charge pump capacitor; forms charge-transfer path to VOUT during inversion phase. |
| 4 (SD) | Logic shutdown control input | TTL/CMOS-compatible enable pin: high ≥2.4 V disables oscillator and reduces quiescent current to 2 µA; low ≤0.4 V enables operation. |
| 5 (VSENSE) | Output voltage feedback sense | High-impedance input monitoring VOUT via external resistor divider; sets regulated output from −3 V to −6 V using R = 5.9 kΩ × |VOUT|. |
| 6 (NC) | No-connect terminal | Internally unconnected; must remain floating-no routing, soldering, or grounding permitted. |
| 7 (VOUT) | Regulated negative output | Delivers −3 V to −6 V output; requires ≥4.7 µF low-ESR capacitor to ground to minimize ripple (≤75 mV at 120 mA). |
| 8 (VIN) | Positive supply input | Accepts 3 V–6 V input; requires local 1 µF low-ESR bypass capacitor to suppress switching transients and supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components, reducing board area, BOM count, and EMI emissions in portable designs. |
| Adjustable regulated output | Set from −3 V to −6 V using single external resistor between VSENSE and VOUT-no divider network required. |
| Low-noise 250 kHz operation | Enables use of small, low-ESR MLCC or solid tantalum capacitors (e.g., 4.7 µF) while maintaining <75 mV ripple at full load. |
| Ultra-low shutdown current | 2 µA typical draw in shutdown preserves battery capacity in always-on or intermittent-use applications like radio receivers. |
| Robust thermal design | 660 mW maximum power dissipation and 150°C/W θJA allow full 120 mA output at +85°C ambient with minimal derating. |
Applications
| Portable Instrumentation | Battery-Powered Audio |
|---|---|
|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring dual-rail analog front-ends from single Li-ion cells. IC Role / Device Role / Timing Role: Generates stable −3.3 V rail for op-amp biasing and ADC reference buffers, synchronized to main system clock via shared VIN domain. Use Value: Enables true bipolar signal acquisition without external inductors or complex layout-reducing size and cost while meeting ±3% accuracy spec over temperature. |
Use Scenario: Compact Bluetooth speakers and headphone amplifiers needing clean negative supply for Class-AB audio output stages. IC Role / Device Role / Timing Role: Provides low-ripple −5 V rail for amplifier bias; switching frequency falls outside audible band and avoids interference with DAC clocks. Use Value: Delivers 120 mA at <75 mV ripple using only three 4.7 µF capacitors-eliminating inductor-induced buzz and simplifying EMC compliance. |
| Disk Drive Electronics | Mobile Radio Receivers |
|
Use Scenario: 2.5-inch HDD servo controllers and spindle motor drivers operating from 5 V USB bus power. IC Role / Device Role / Timing Role: Supplies regulated −3 V for preamplifier ICs and read-channel analog circuits; shutdown pin enables power gating during idle states. Use Value: Achieves 2 µA shutdown current and ±3% regulation across −40°C to +85°C-ensuring consistent head positioning accuracy in varying environmental conditions. |
Use Scenario: Sub-GHz remote control receivers and pager basebands powered by coin-cell batteries. IC Role / Device Role / Timing Role: Generates −3 V bias for RF mixer and IF amplifier stages; low quiescent current extends operational lifetime between battery replacements. Use Value: Supports >1-year shelf life in standby with 2 µA shutdown draw, while maintaining fast 2 ms turn-on time under full load per Figure 11. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated switched-capacitor inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP3604ARZ | Pin-for-pin compatible but fixed −3 V output; lacks VSENSE pin and external adjustability. | Suitable only for fixed −3 V systems; cannot support −4 V or −5 V configurations without redesign. | Select ADP3604ARZ when output voltage is fixed and board space is constrained-no external resistor needed. |
| MAX680ESA+ | Higher 140 mA output; ±5% regulation; 100 kHz switching; requires external feedback resistors for adjustment. | Lower switching frequency increases capacitor size requirements; wider regulation tolerance affects precision analog rails. | Choose MAX680ESA+ only if legacy design compatibility or higher temperature rating (+125°C) is mandatory. |
Compared with ADP3605ARU-3-REEL7, ADP3604ARZ offers simpler implementation for fixed −3 V needs but sacrifices adjustability, while MAX680ESA+ trades regulation accuracy and frequency for extended temperature range-making ADP3605ARU-3-REEL7 optimal for precision, compact, battery-sensitive dual-rail systems.
Availability
ADP3605ARU-3-REEL7 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered audio subsystems, and disk drive electronics requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for ADP3605ARU-3-REEL7 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 ADP36xx family was designed specifically for inductorless, regulated negative voltage generation in space- and power-constrained portable electronics-emphasizing low EMI, wide input range, and simple capacitor-based implementation.
FAQ
What output voltage range does the ADP3605ARU-3-REEL7 support?
The ADP3605ARU-3-REEL7 supports an adjustable regulated output from −3 V to −6 V, set by a single external resistor between VSENSE and VOUT using the formula R = 5.9 kΩ × |VOUT|. This allows precise tailoring of the negative rail without additional divider components or trimming, and the ±3% regulation holds across load and temperature.
Can the ADP3605ARU-3-REEL7 operate from a 3.3 V input supply?
Yes, the ADP3605ARU-3-REEL7 operates from 3 V to 6 V, making it fully compatible with 3.3 V logic rails and single-cell Li-ion sources. At 3.3 V input, it can deliver up to −3.0 V at 120 mA with maintained regulation accuracy and 250 kHz switching-verified in Figure 8 and Table 1 of the Rev. B datasheet.
What capacitor types are recommended for CP and CO in the ADP3605ARU-3-REEL7?
Analog Devices recommends low-ESR solid tantalum or multilayer ceramic capacitors (MLCC) for both CP and CO-specifically 4.7 µF units such as TOKIN MLCC or Sprague 675D series. These minimize output ripple (<75 mV at 120 mA) and voltage drop across CP, which directly impacts achievable |VOUT| due to its 2× load current stress.
How does the shutdown function work on the ADP3605ARU-3-REEL7?
The ADP3605ARU-3-REEL7 enters shutdown when SD (Pin 4) is pulled high to ≥2.4 V, disabling the internal oscillator and reducing quiescent current to 2 µA typical. Pulling SD low (≤0.4 V) or grounding it restores normal operation. If unused, SD must be tied to GND-floating is not allowed per Pin Function Descriptions (Table 5).
Is the ADP3605ARU-3-REEL7 pin-compatible with other devices in the ADP36xx family?
Yes-the ADP3605ARU-3-REEL7 is pin-for-pin and functionally compatible with the ADP3604, sharing identical 8-lead SOIC_N (R-8) pinout and core switching architecture. However, ADP3605 adds the VSENSE pin for output adjustability, while ADP3604 fixes output at −3 V and omits VSENSE-requiring different external component layouts.
ADP3605ARU-3-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
ADP3605ARU-3-REEL7 FAQ
1.How can I place an order for ADP3605ARU-3-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3605ARU-3-REEL7 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 ADP3605ARU-3-REEL7 reliable?
The price and inventory of ADP3605ARU-3-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3605ARU-3-REEL7 is usually 5 days.
3.What payment methods are accepted for ADP3605ARU-3-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3605ARU-3-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3605ARU-3-REEL7?
ADP3605ARU-3-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3605ARU-3-REEL7 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 ADP3605ARU-3-REEL7?
For technical support, including ADP3605ARU-3-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3605ARU-3-REEL7 requirements.
6.How does Aetrix verify that ADP3605ARU-3-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADP3605ARU-3-REEL7 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 ADP3605ARU-3-REEL7 meets industry standards.
7.What is the process for return or replacement of ADP3605ARU-3-REEL7?
All ADP3605ARU-3-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3605ARU-3-REEL7, 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 ADP3605ARU-3-REEL7 part is unused and in its original packaging.
Return procedure for ADP3605ARU-3-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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