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Analog Devices Inc. ADM8839ACP
- Part No.:
- ADM8839ACP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 20-VFQFN Exposed Pad, CSP
- Datasheet:
-
ADM8839ACP.pdf
- Description:
- IC CHARGE PUMP REG TFT 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,313
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Product details
Overview
ADM8839ACP from Analog Devices is a triple-output charge pump regulator IC designed specifically for biasing color TFT LCD panels in portable electronics. It generates +5 V (±2%), +15 V, and −15 V from a single 3 V supply, supports ≤20 mA on the regulated 5 V output, delivers ±150 μA on each rail of the ±15 V outputs, and features Green Idle™ load-sensing oscillator control for power efficiency in mobile phone displays.
For engineers reviewing the ADM8839ACP datasheet, ADM8839ACP pinout, ADM8839ACP application, or ADM8839ACP equivalent, this page provides verified specifications, validated pin functions, confirmed TFT panel sequencing behavior, real-world ripple and transient response data, and qualified alternative options for display power management design.
Technical Context
The ADM8839ACP integrates a voltage doubler (for +5 V), a tripler (for +15 V), and an inverting tripler (for −15 V), all driven by a 60–140 kHz internal oscillator. Its power-up sequence enforces −15 V ramp-up before +15 V enablement to prevent TFT gate oxide stress, with tDELAY = 600 μs between −15 V fall and +15 V rise during shutdown.
It employs CMOS fabrication for low quiescent current (250–500 μA active, <5 μA shutdown) and includes dual LDO control: internal LDO regulates +5 VOUT (4.9–5.1 V at 10 μA–20 mA), while LDO_ON/OFF allows external LDO substitution via +5VIN feed into tripler/inverter stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| +5 V Output Voltage | 4.9 V to 5.1 V at 10 μA–20 mA load; ensures stable LCD controller supply within ±2% tolerance. |
| +15 V Output Voltage | 14.0 V to 16.0 V at 1 μA–150 μA load; supplies TFT gate drive with sufficient headroom for panel variation. |
| −15 V Output Voltage | −16.0 V to −14.0 V at −1 μA to −150 μA load; enables complementary gate biasing without polarity inversion. |
| Charge Pump Frequency | 60–140 kHz; balances capacitor size (2.2 μF/0.22 μF) and EMI in handheld form factors. |
| Power Efficiency | 82% at 5 mA +5 V load and ±150 μA ±15 V loads; minimizes battery drain in always-on display modes. |
| Transient Response | 5 μs settling time for 10 μA → 8 mA step on +5 VOUT; maintains image integrity during rapid frame updates. |
| Shutdown Current | <5 μA at 25°C; meets ultra-low standby requirements for cellular phone sleep states. |
Pinout & Package
The ADM8839ACP is housed in a 20-lead LFCSP_VQ (4 mm × 4 mm, very thin quad) package with exposed thermal pad. Pin 1 indicator is marked on top surface; pins 1/8 and 9/18 must be electrically tied on PCB for proper VCC/GND distribution.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 1, 8) | Positive Supply Input | 3 V input requiring 2.2 μF decoupling; dual-pin layout reduces IR drop and improves PSRR. |
| +5VOUT (Pin 4) | Regulated 5 V Output | LDO-stabilized output for LCD controller; requires 2.2 μF capacitor to ground for ripple suppression. |
| +15VOUT (Pin 10) | Tripled Positive Output | Derived from +5VIN; supplies TFT source/gate drivers; needs 0.22 μF capacitor for stability. |
| −15VOUT (Pin 17) | Inverted Tripled Negative Output | Generated via charge pump inversion; sequenced to ramp before +15VOUT to prevent panel damage. |
| SHDN (Pin 7) | Active-Low Shutdown Control | CMOS-compatible logic input; asserts discharge circuit to drive all outputs to 0 V during shutdown. |
| LDO_ON/OFF (Pin 6) | Internal/External LDO Selection | Logic high enables internal LDO; low isolates it, allowing external LDO to regulate +5VIN and feed tripler/inverter. |
| GND (Pins 9, 18) | Ground Reference | Dual ground pins reduce impedance and improve noise immunity for sensitive analog outputs. |
| C1+/C1− (Pins 20, 19) | Main Doubler Capacitor Interface | Connects to 2.2 μF flying capacitor; defines primary charge transfer path for +5 V generation. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output architecture (+5 V, +15 V, −15 V) | Eliminates need for three separate regulators; reduces BOM count and board space in compact TFT modules. |
| Green Idle™ load-sensing oscillator | Activates charge pump only when output capacitance requires replenishment, cutting idle power in low-frame-rate modes. |
| Controlled power sequencing | Enforces −15 V rise before +15 V rise (tDELAY = 600 μs), preventing gate-to-source overvoltage in TFT pixel transistors. |
| Configurable LDO path | Allows system-level optimization: internal LDO for simplicity or external LDO for tighter ripple/noise specs on +5 V rail. |
| Low-noise 5 V LDO output | Delivers 10 mVp-p ripple at 8 mA load, meeting stringent noise requirements for analog display interface circuits. |
Applications
| Mobile Phone Display Power | TFT LCD Bias Supply |
|---|---|
|
Use Scenario: Powering gate driver ICs and column drivers in QVGA–WVGA color TFT panels within slim smartphone bezels. IC Role / Device Role / Timing Role: Generates synchronized +15 V and −15 V gate bias rails with enforced sequencing, plus clean 5 V logic supply for timing controller. Use Value: Prevents gate oxide breakdown during power-up/down by ensuring −15 V reaches −3 V before enabling +15 V output. |
Use Scenario: Providing bias voltages for industrial handheld instruments with sunlight-readable TFT displays operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Delivers temperature-stable ±15 V outputs (±1 V variation over full range) and 5 V LDO output with <5 μA shutdown current. Use Value: Enables extended battery life in field-deployed devices via ultra-low quiescent current and efficient charge pumping. |
| Portable Medical Monitor Display | Automotive Infotainment TFT Panel |
|
Use Scenario: Supplying bias rails for monochrome or color TFTs in battery-powered patient monitors requiring ESD-hardened design. IC Role / Device Role / Timing Role: Provides Class I ESD-protected ±15 V outputs and 5 V LDO with fast 5 μs transient response for artifact-free waveform rendering. Use Value: Maintains display fidelity during sudden load changes (e.g., touch-screen activation) without visible flicker or distortion. |
Use Scenario: Driving small-format TFTs in automotive cluster or center-stack displays where thermal dissipation is constrained. IC Role / Device Role / Timing Role: Delivers 82% power efficiency at typical loads and uses LFCSP_VQ package (θJA = 31°C/W) for direct PCB heat sinking. Use Value: Reduces thermal stress in sealed enclosures by minimizing power loss in the bias generation stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1674EUA+ | Single-output +5 V charge pump; no ±15 V generation; higher 1 MHz switching frequency. | Suitable only for 5 V-only TFT logic supply; cannot replace ADM8839ACP's triple-rail functionality. | Select when only regulated 5 V is needed and board space permits larger external capacitors for 1 MHz operation. |
| TPS60403DBVR | Dual-output (±5 V); lacks +15 V/−15 V capability; 600 kHz fixed frequency; no sequencing control. | Applicable for low-voltage analog biasing but incompatible with standard TFT gate drive voltage requirements. | Choose for systems requiring dual-rail analog supplies, not for TFT panel gate driver biasing. |
Compared with MAX1674EUA+ and TPS60403DBVR, the ADM8839ACP uniquely integrates triple-rail generation with hardware-enforced sequencing, making it irreplaceable in designs requiring simultaneous +5 V, +15 V, and −15 V with safe power-up order for TFT panels.
Availability
ADM8839ACP is available at Aetrix Electronics and suitable for mobile phone display power, handheld instrument TFT biasing, portable medical monitor displays, automotive infotainment panels, and industrial HMI applications requiring stable component supply across extended temperature ranges.
Supply support for ADM8839ACP 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, headquartered in Norwood, MA, with decades of expertise in precision power management and signal conditioning.
The ADM8839ACP belongs to Analog Devices' TFT LCD power management product line, engineered specifically to deliver sequenced, low-noise, multi-rail bias supplies for color thin-film transistor displays in space-constrained portable electronics.
FAQ
What is the function of the LDO_ON/OFF pin on the ADM8839ACP?
The LDO_ON/OFF pin (Pin 6) selects between internal and external regulation of the +5 V rail. When driven high, the ADM8839ACP uses its integrated LDO to regulate +5VOUT; when driven low, the internal LDO is isolated, allowing an external LDO to regulate the +5VIN node that feeds the ±15 V charge pump stages. This flexibility supports system-level noise and efficiency trade-offs without redesigning the core ADM8839ACP circuit.
Does the ADM8839ACP support automatic power sequencing for TFT panels?
Yes, the ADM8839ACP implements hardware-controlled power sequencing: the −15 V output ramps first, and the +15 V output is held off until −15 V reaches −3 V. This delay (tDELAY = 600 μs) prevents gate-to-source overvoltage stress in TFT transistors during startup. The ADM8839ACP enforces this sequence internally-no external timing components or firmware control are required.
What is the maximum load current the ADM8839ACP can deliver on its ±15 V outputs?
In the typical configuration shown in Figure 15, the ADM8839ACP delivers up to +150 μA on +15VOUT and −150 μA on −15VOUT. In the current-boost configuration (Figure 17), it supports up to ±400 μA on each rail. However, total combined current from both ±15 V outputs must not exceed 300 μA in typical mode or 800 μA in boost mode to maintain specified output voltage accuracy.
How does the Green Idle™ feature improve efficiency in the ADM8839ACP?
The Green Idle™ feature in the ADM8839ACP dynamically enables the charge pump oscillator only when the +5 V output capacitor requires recharging-based on real-time load current sensing. This eliminates continuous switching losses during light or no-load conditions, reducing quiescent current to 250–500 μA and extending battery life in always-on display applications such as mobile phones and medical monitors using the ADM8839ACP.
What package type and thermal characteristics apply to the ADM8839ACP?
The ADM8839ACP uses a 20-lead LFCSP_VQ package (4 mm × 4 mm body, CP-20-1), with θJA = 31°C/W. Its exposed thermal pad must be soldered to a PCB copper pour for effective heat dissipation. The package operates across −40°C to +85°C and supports reflow soldering per JEDEC J-STD-020. This compact, thermally enhanced footprint suits high-density portable electronics where the ADM8839ACP is deployed.
ADM8839ACP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad, CSP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 2.7V ~ 4.2V
- Number of Outputs:
- -
- Voltage - Output:
- -15V, 5V, 15V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LFCSP-VQ (4x3.75)
ADM8839ACP FAQ
1.How can I place an order for ADM8839ACP through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8839ACP 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 ADM8839ACP reliable?
The price and inventory of ADM8839ACP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8839ACP is usually 5 days.
3.What payment methods are accepted for ADM8839ACP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8839ACP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8839ACP?
ADM8839ACP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8839ACP 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 ADM8839ACP?
For technical support, including ADM8839ACP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8839ACP requirements.
6.How does Aetrix verify that ADM8839ACP is sourced from the original manufacturer or authorized distributors?
All ADM8839ACP 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 ADM8839ACP meets industry standards.
7.What is the process for return or replacement of ADM8839ACP?
All ADM8839ACP units undergo pre-shipment inspection (PSI). If there is an issue with ADM8839ACP, 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 ADM8839ACP part is unused and in its original packaging.
Return procedure for ADM8839ACP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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