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Analog Devices Inc. ADM8829ARTZ-REEL
- Part No.:
- ADM8829ARTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6
- Datasheet:
-
ADM8829ARTZ-REEL.pdf
- Description:
- IC REG CHARGE PUMP 25MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
ADM8829ARTZ-REEL from Analog Devices is a switched-capacitor voltage inverter IC that generates a regulated negative output voltage from a positive input supply. It operates across +1.5 V to +5.5 V input, delivers up to 25 mA output current, achieves ≥99% voltage conversion efficiency at no load, and features a 6-lead SOT-23 package with NC pin for simplified layout. It is used in op amp dual-rail power supplies where space-constrained single-supply systems require clean negative bias.
For engineers reviewing the ADM8829ARTZ-REEL datasheet, ADM8829ARTZ-REEL pinout, ADM8829ARTZ-REEL application, or ADM8829ARTZ-REEL equivalent, key selection criteria include input voltage range compatibility, shutdown absence (vs. ADM8828), output resistance under load, capacitor ESR sensitivity, and thermal performance in handheld instrumentation PCBs.
Technical Context
The ADM8829 implements a two-phase charge-pump topology using internal MOSFET switches driven by an on-chip oscillator (50–190 kHz). It requires only two external low-ESR electrolytic capacitors (C1 = flying, C2 = output) to invert VIN to –VIN without inductors. Unlike the ADM8828, it lacks a shutdown pin-Pin 4 is NC, eliminating control logic overhead and leakage paths.
Its output impedance is 18 Ω (typ) at 5 mA load and rises with temperature and decreasing input voltage. Ripple is tightly coupled to capacitor value and ESR: 25 mV p-p at 5 mA with 1 µF/low-ESR caps, increasing to 130 mV p-p at full 25 mA load. No internal regulation loop is present-output follows inverted input minus losses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5 V to +5.5 V - supports Li-ion, alkaline, and regulated 3.3 V/5 V rails without external LDO pre-regulation. |
| Output Current | 25 mA max - sufficient to power rail-to-rail op amps (e.g., AD8605) or small LCD bias circuits. |
| Voltage Conversion Efficiency | 99.5% to 99.96% (no load) - minimizes heat rise and extends battery life in portable devices. |
| Output Resistance | 18 Ω (typ), 28 Ω (max) at 5 mA - defines load regulation error: ~140 mV drop at 7.5 mA load. |
| Charge-Pump Frequency | 65 kHz (at VIN = +2.25 V) to 190 kHz (at VIN = +5 V) - higher frequency enables smaller external capacitors but increases EMI risk. |
| Output Ripple | 25 mV p-p (5 mA), 130 mV p-p (25 mA) - dictates need for post-filtering in noise-sensitive analog signal chains. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable consumer environments without derating. |
Pinout & Package
ADM8829ARTZ-REEL is housed in a RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178-AB, package option RJ-6), with 1.9 mm × 2.9 mm footprint and 1.3 mm height. Pin 4 is NC (no connect), distinguishing it electrically and physically from the ADM8828.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Negative output terminal | Delivers inverted voltage (–VIN ± loss); must be decoupled with low-ESR capacitor to GND. |
| 2 - IN | Positive input supply | Accepts +1.5 V to +5.5 V; requires local 1 µF bypass capacitor to GND for transient current delivery. |
| 3 - CAP+ | Positive flying capacitor node | Connects to + terminal of C1; switching node with high dv/dt-keep trace short and away from analog signals. |
| 4 - NC | No connect | Unbonded die pad; must remain unconnected on PCB-no pull-up/down or routing allowed. |
| 5 - GND | Power ground reference | Primary return path for charge pump and load; tie directly to system ground plane with low-inductance connection. |
| 6 - CAP– | Negative flying capacitor node | Connects to – terminal of C1; complements CAP+ in charge transfer phase; sensitive to parasitic capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| No shutdown pin (NC at Pin 4) | Eliminates external control logic and SHDN-related leakage; simplifies BOM and layout for fixed-operation applications. |
| 99%+ voltage conversion efficiency | Reduces power loss to <1% at light loads-critical for battery runtime in PDAs and remote sensors. |
| Two-capacitor operation | Removes need for inductors or transformers-enables ultra-thin designs in cellular phone backlight and LCD bias rails. |
| Low output resistance (18 Ω typ) | Supports stable –3 V or –5 V rails under dynamic loads up to 25 mA without significant sag or oscillation. |
| Wide input range (+1.5 V to +5.5 V) | Enables direct use across multiple battery chemistries (1× Li-ion, 2× alkaline, USB 5 V) without input stage redesign. |
Applications
| Op Amp Dual-Rail Supply | LCD Bias Generation |
|---|---|
|
Use Scenario: Powering rail-to-rail CMOS op amps (e.g., AD8603) from a single 3.3 V supply in portable data loggers. IC Role / Device Role / Timing Role: Voltage inverter providing clean –3.3 V rail to complement +3.3 V input, enabling true bipolar signal swing. Use Value: Eliminates need for discrete inductor-based DC/DC converters-reducing board area by >40% and EMI emissions. |
Use Scenario: Generating negative gate bias (–15 V to –20 V) for STN/TN LCD panels in handheld test equipment. IC Role / Device Role / Timing Role: Charge-pump inverter stepping down and inverting 3.3 V or 5 V to stable negative bias voltage. Use Value: Achieves <200 mV p-p ripple at 10 mA load with 2.2 µF low-ESR tantalum caps-meeting contrast stability specs. |
| Cellular Phone Audio Codec Bias | Remote Sensor Signal Conditioning |
|
Use Scenario: Providing –1.8 V bias for audio codec line drivers in GSM/GPRS handsets operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Low-noise inverter delivering stable negative rail during RF transmit bursts with minimal supply coupling. Use Value: 20 nA shutdown not required-NC pin ensures zero control overhead; 65 kHz base frequency avoids AM band interference. |
Use Scenario: Enabling precision instrumentation amplifiers (e.g., AD8226) in battery-powered remote RTD transmitters. IC Role / Device Role / Timing Role: Generating –2.5 V reference rail for ADC driver stages in 4–20 mA loop-powered nodes. Use Value: 99.5% efficiency preserves battery capacity over multi-year deployments; 18 Ω output resistance ensures <1 LSB error at 24-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8828ARTZ-REEL7 | Includes SHDN pin (Pin 4 active); 20 nA shutdown current; identical pinout except Pin 4 function. | Required where host MCU must dynamically enable/disable negative rail (e.g., power-gated sensor subsystems). | Select ADM8828ARTZ-REEL7 only if active shutdown control is needed-otherwise ADM8829ARTZ-REEL reduces component count. |
| MAX680ESA+ | Higher 100 mA output; 120 kHz fixed frequency; requires 1 µF ceramic caps; ±5 V output capability. | Suitable for higher-current analog front-ends (e.g., photodiode TIA bias) but consumes more board area and cost. | Choose MAX680ESA+ when >25 mA or tighter output regulation is required-ADM8829ARTZ-REEL excels in ultra-low-power, space-constrained roles. |
Compared with ADM8828ARTZ-REEL7, ADM8829ARTZ-REEL removes shutdown control to reduce quiescent leakage and simplify layout; compared with MAX680ESA+, it trades output current and regulation for lower cost, smaller size, and superior light-load efficiency in portable instrumentation.
Availability
ADM8829ARTZ-REEL is available at Aetrix Electronics and suitable for handheld instruments, LCD panels, and op amp power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM8829ARTZ-REEL 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 family was designed specifically for compact, low-power voltage inversion in battery-operated portable electronics-emphasizing capacitor-only operation, wide input range, and minimal external components.
FAQ
What is the function of Pin 4 on the ADM8829ARTZ-REEL?
Pin 4 on the ADM8829ARTZ-REEL is NC (No Connect)-it is internally unconnected and must remain unconnected on the PCB. This distinguishes the ADM8829ARTZ-REEL from the ADM8828, which uses Pin 4 as an active SHDN control input. Using ADM8829ARTZ-REEL in a design intended for ADM8828 requires verifying that Pin 4 is left floating and not pulled or routed.
Can the ADM8829ARTZ-REEL generate –5 V from a +5 V input?
Yes-the ADM8829ARTZ-REEL inverts the input supply with minimal loss: from +5.0 V input, it delivers approximately –4.8 V to –4.9 V under light load due to switch on-resistance and capacitor ESR. At 25 mA load, output drops to ~–4.5 V (based on 18 Ω output resistance). For precise –5.0 V, external regulation or feedback is required-ADM8829ARTZ-REEL is an unregulated inverter.
What capacitor types and values are recommended for ADM8829ARTZ-REEL?
Analog Devices specifies low-ESR electrolytic capacitors (≤0.2 Ω) of 1 µF for both C1 (flying) and C2 (output). Tantalum or polymer aluminum electrolytics meet this requirement. Ceramic capacitors are not recommended due to microphonic effects and voltage coefficient issues. Increasing C1 lowers output resistance; increasing C2 reduces ripple-both should match in value per datasheet guidance.
How does temperature affect the performance of ADM8829ARTZ-REEL?
Over –40°C to +85°C, ADM8829ARTZ-REEL output resistance increases by ~2× (from ~15 Ω to ~30 Ω), and charge-pump frequency decreases ~15% at cold extremes. Efficiency remains >98% at 1 kΩ load across the range. These shifts are characterized in Figures 9 and 10 of the datasheet-designs requiring tight regulation at temperature extremes should include margin in output impedance calculations.
Is ADM8829ARTZ-REEL pin-compatible with any other Analog Devices inverters?
ADM8829ARTZ-REEL shares the same 6-lead SOT-23 (RJ-6) package and pinout as ADM8828ARTZ-REEL7, except Pin 4 is NC instead of SHDN. Mechanical mounting is identical, but electrical substitution requires confirming that shutdown functionality is unnecessary-no PCB changes are needed for footprint, but Pin 4 must be left unconnected in ADM8829ARTZ-REEL layouts.
ADM8829ARTZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
ADM8829ARTZ-REEL FAQ
1.How can I place an order for ADM8829ARTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8829ARTZ-REEL 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 ADM8829ARTZ-REEL reliable?
The price and inventory of ADM8829ARTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8829ARTZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM8829ARTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8829ARTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8829ARTZ-REEL?
ADM8829ARTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8829ARTZ-REEL 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 ADM8829ARTZ-REEL?
For technical support, including ADM8829ARTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8829ARTZ-REEL requirements.
6.How does Aetrix verify that ADM8829ARTZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM8829ARTZ-REEL 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 ADM8829ARTZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM8829ARTZ-REEL?
All ADM8829ARTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM8829ARTZ-REEL, 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 ADM8829ARTZ-REEL part is unused and in its original packaging.
Return procedure for ADM8829ARTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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