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Analog Devices Inc. ADM8829ART-REEL7
- Part No.:
- ADM8829ART-REEL7
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6
- Datasheet:
-
ADM8829ART-REEL7.pdf
- Description:
- IC CHRG PUMP INV SW/CAP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:498,387
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Product details
Overview
ADM8829ART-REEL7 from Analog Devices is a switched-capacitor voltage inverter IC that generates a regulated negative output voltage (–1.5 V to –5.5 V) from a positive input supply (+1.5 V to +5.5 V), delivering up to 25 mA with 99% voltage conversion efficiency. It operates without an inductor, requires only two 1 µF external capacitors, and features no shutdown pin-distinguishing it from the ADM8828. It is used in op amp dual-rail power supplies and LCD bias generation.
For engineers reviewing the ADM8829ART-REEL7 datasheet, ADM8829ART-REEL7 pinout, ADM8829ART-REEL7 application, or ADM8829ART-REEL7 equivalent, key selection criteria include input voltage range, output current capability, charge-pump frequency, output resistance, and SOT-23-6 package compatibility for space-constrained portable designs.
Technical Context
The ADM8829 implements a two-phase switched-capacitor inversion topology using internal MOSFET switches controlled by an on-chip oscillator (50–190 kHz). Unlike the ADM8828, it lacks a SHDN pin-Pin 4 is NC-and relies on continuous operation with no enable/disable control.
It uses external flying (C1) and output (C2) capacitors to transfer and store charge; output ripple (25 mV p-p at 5 mA) and source resistance (18 Ω typical) are directly dependent on capacitor ESR and value. The device achieves >99% voltage conversion efficiency under no-load conditions and maintains stable inversion across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5 V to +5.5 V - supports single-cell Li-ion, alkaline, and regulated 3.3 V/5 V rails |
| Output Voltage Range | –1.5 V to –5.5 V - inverted, rail-to-rail complementary to input |
| Max Output Current | 25 mA - sufficient for biasing op amps, LCD segment drivers, and low-power analog circuitry |
| Voltage Conversion Efficiency | 99.5% typ. (no load) - minimizes input power waste and thermal rise in battery-powered systems |
| Charge-Pump Frequency | 65 kHz (at VIN = +2.25 V) to 190 kHz (at VIN = +5 V) - higher frequency enables smaller external capacitors |
| Output Resistance | 18 Ω typ. (IL = 5 mA) - defines load regulation and voltage droop under dynamic current demand |
| Output Ripple | 25 mV p-p (IL = 5 mA) - determines noise sensitivity in precision analog signal chains |
Pinout & Package
The ADM8829ART-REEL7 is housed in a 6-lead SOT-23 package (JEDEC MO-178-AB, package option RJ-6), with 1.3 mm × 2.9 mm footprint and 1.15 mm height. Pin 1 is marked with a dot; leads are gull-wing, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Negative output terminal | Delivers inverted voltage rail; connects to load ground reference or op amp negative supply pin |
| 2 (IN) | Positive input supply | Accepts +1.5 V to +5.5 V; must be bypassed with ≥1 µF capacitor to GND for transient stability |
| 3 (CAP+) | Positive flying capacitor node | Connects to positive plate of C1; switching node driven by internal oscillator phase φ1 |
| 4 (NC) | No connect | Unbonded pad; must remain floating-no PCB trace or pull-up/pull-down allowed |
| 5 (GND) | Power ground reference | Common return for IN, CAP–, and load; requires low-impedance plane connection |
| 6 (CAP–) | Negative flying capacitor node | Connects to negative plate of C1; switching node driven by internal oscillator phase φ2 |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor negative voltage generation | Enables compact, EMI-quiet DC/DC inversion without magnetic components or layout-sensitive routing |
| Two-capacitor operation | Reduces BOM count and board area-only C1 (flying) and C2 (output) required, both 1 µF low-ESR electrolytic |
| High voltage conversion efficiency | 99.5% typical no-load efficiency preserves battery life and avoids thermal derating in sealed enclosures |
| Wide input voltage support | +1.5 V minimum enables use with single alkaline or NiMH cells; +5.5 V max accommodates 5 V logic rails |
| SOT-23-6 footprint | Standardized, hand-solderable, and reflow-compatible package compatible with automated assembly and IPC-7351B land patterns |
Applications
| Op Amp Dual-Rail Supply | LCD Panel Bias Generation |
|---|---|
Use Scenario: Providing symmetric ±V supply to rail-to-rail op amps in portable data acquisition front-ends where only a single positive battery rail is available. IC Role / Device Role / Timing Role: Voltage inverter generating clean, low-noise negative rail referenced to system ground. Use Value: Enables true bipolar signal conditioning without inductors or complex regulators-reducing size, cost, and EMI in handheld instruments. | Use Scenario: Generating negative gate bias (e.g., –3 V to –5 V) for STN or segment LCD displays in PDAs and medical handhelds. IC Role / Device Role / Timing Role: Fixed-ratio charge-pump inverter delivering stable negative voltage independent of display refresh rate. Use Value: Eliminates need for discrete transistor-based inverters or transformer-based solutions-improving reliability and simplifying layout. |
| Cellular Phone Audio Codec Bias | Remote Sensor Signal Conditioning |
Use Scenario: Supplying negative bias to audio codec line drivers and headphone amplifiers in GSM/3G feature phones with tight power budgets. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supporting burst-mode audio playback while maintaining low standby drain. Use Value: Delivers 25 mA peak current with <25 mV ripple-preserving SNR in analog audio paths without requiring LDO post-regulation. | Use Scenario: Powering isolated instrumentation amplifiers and ADC reference buffers in battery-operated remote sensor nodes. IC Role / Device Role / Timing Role: Compact, high-efficiency negative rail generator enabling true differential input measurement against grounded sensors. Use Value: Supports –40°C to +85°C operation with <18 Ω output impedance-ensuring stable offset performance across industrial temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Higher quiescent current (1.2 mA vs. 0.6 mA), fixed 100 kHz frequency, same SOT-23-8 package (pinout incompatible) | Requires different capacitor values (2.2 µF); less efficient at light loads (92% vs. 99.5%) | Choose when higher output current (±50 mA) is needed and board layout allows larger caps and different footprint |
| TC7660COA | Lower max input voltage (+3.5 V), no guaranteed 25 mA output, 10 kHz fixed frequency, SOIC-8 package | Not suitable for 5 V systems or >15 mA loads; higher output ripple (100 mV p-p) | Consider only for legacy 3 V designs with relaxed ripple and current requirements and SOIC-compatible layouts |
Compared with MAX680ESA+ and TC7660COA, the ADM8829ART-REEL7 offers superior voltage conversion efficiency (>99%), wider input range (+1.5 V to +5.5 V), lower output resistance (18 Ω), and SOT-23-6 compatibility-making it optimal for modern space- and power-constrained portable analog subsystems.
Availability
ADM8829ART-REEL7 is available at Aetrix Electronics and suitable for handheld instruments, LCD panels, cellular phones, and remote data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM8829ART-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADM8828/ADM8829 product line was designed specifically for compact, inductorless negative voltage generation in battery-powered portable electronics-emphasizing efficiency, minimal external components, and robust operation across industrial temperatures.
FAQ
What is the function of Pin 4 (NC) on the ADM8829ART-REEL7?
Pin 4 on the ADM8829ART-REEL7 is explicitly designated as "No Connect" (NC) in the datasheet and functional block diagram. It corresponds to the SHDN pin on the ADM8828 but is unconnected internally in the ADM8829ART-REEL7. This pin must remain electrically floating-no trace, pull-up, pull-down, or grounding is permitted, as it is not bonded to die. The ADM8829ART-REEL7 operates continuously and has no shutdown capability.
Does the ADM8829ART-REEL7 require specific capacitor types or ratings?
Yes-the ADM8829ART-REEL7 requires two low-ESR electrolytic capacitors: C1 (flying) and C2 (output), each rated at 1 µF minimum. Per the datasheet, ESR must be <0.2 Ω to maintain efficiency and low ripple. Tantalum or aluminum polymer capacitors meeting this ESR spec are recommended; standard ceramic capacitors are unsuitable due to insufficient capacitance retention under bias and higher effective ESR at switching frequencies.
How does the ADM8829ART-REEL7 differ from the ADM8828ART-REEL7?
The ADM8829ART-REEL7 omits the shutdown (SHDN) function present in the ADM8828ART-REEL7: Pin 4 is NC instead of SHDN, and quiescent current remains at 600 µA (not reducible to 20 nA). Both share identical voltage inversion architecture, SOT-23-6 package, input/output specs, and capacitor requirements-but only the ADM8828 supports active power gating. The ADM8829ART-REEL7 is selected when continuous operation is preferred and board space precludes adding a control signal.
What is the maximum allowable output current for the ADM8829ART-REEL7 at 3.3 V input?
At VIN = +3.3 V, the ADM8829ART-REEL7 delivers up to 25 mA continuous output current, as confirmed by Figure 4 (Output Current vs. Capacitance) and the Absolute Maximum Ratings table. Derating is not required at this input level; however, output voltage drops linearly with load (e.g., –3.0 V at 25 mA per Figure 7), and output resistance increases slightly with temperature-so thermal design should ensure ambient stays within –40°C to +85°C.
Is the ADM8829ART-REEL7 suitable for automotive applications?
No-the ADM8829ART-REEL7 is specified only for the industrial temperature range (–40°C to +85°C) and lacks AEC-Q200 qualification, automotive-grade screening, or extended temperature support (e.g., –40°C to +125°C). Its absolute maximum input voltage (+6 V) also falls short of automotive 12 V battery transient requirements. For automotive use, designers should select qualified alternatives such as the ADP5600 or LTC3260, not the ADM8829ART-REEL7.
ADM8829ART-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 120kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
ADM8829ART-REEL7 FAQ
1.How can I place an order for ADM8829ART-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8829ART-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 ADM8829ART-REEL7 reliable?
The price and inventory of ADM8829ART-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8829ART-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM8829ART-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8829ART-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8829ART-REEL7?
ADM8829ART-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8829ART-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 ADM8829ART-REEL7?
For technical support, including ADM8829ART-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8829ART-REEL7 requirements.
6.How does Aetrix verify that ADM8829ART-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM8829ART-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 ADM8829ART-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM8829ART-REEL7?
All ADM8829ART-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8829ART-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 ADM8829ART-REEL7 part is unused and in its original packaging.
Return procedure for ADM8829ART-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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