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Analog Devices Inc. ADM8839ACPZ-REEL
- Part No.:
- ADM8839ACPZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 20-VFQFN Exposed Pad, CSP
- Datasheet:
-
ADM8839ACPZ-REEL.pdf
- Description:
- IC REG CONV TFT LCD 3OUT 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,435
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Product details
Overview
ADM8839ACPZ-REEL from Analog Devices is a CMOS charge pump regulator IC designed specifically for color TFT LCD panel bias supply, generating +5 V (±2%), +15 V, and −15 V from a single 3 V input. It integrates voltage doubler, tripler, inverter, and low-dropout (LDO) regulation with Green Idle™ load-sensing oscillator control. Key confirmed parameters: 5 mA max +5 V output current, ±150 μA ±15 V output current, 82% power efficiency at nominal load, 60–140 kHz charge pump frequency, and 20-lead LFCSP_VQ package.
For engineers reviewing the ADM8839ACPZ-REEL datasheet, ADM8839ACPZ-REEL pinout, ADM8839ACPZ-REEL application, or ADM8839ACPZ-REEL equivalent, this page delivers verified specifications, functional pin roles, real-world TFT panel sequencing behavior, LDO bypass capability, and validated alternative options for mobile display power design.
Technical Context
The ADM8839ACPZ-REEL implements a multi-stage charge pump architecture: a voltage doubler feeds an internal LDO to produce regulated +5 VOUT, while that +5 V output drives separate tripler and inverter circuits to generate +15 VOUT and −15VOUT. Power-up sequencing is hardwired - −15 V ramps first, then +15 V enables only after −15 V reaches −3 V - ensuring safe TFT gate driver startup.
It features dual control inputs: SHDN (active-low shutdown with discharge circuit) and LDO_ON/OFF (CMOS-selectable internal/external LDO regulation). The Green Idle™ scheme dynamically enables the doubler oscillator only when load demand exceeds threshold, reducing quiescent current to 250–500 μA under no load and <5 μA in shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| +5 V Output Voltage | 4.9–5.1 V at 10 μA–20 mA load; ±2% regulation ensures stable LCD controller supply. |
| +15 V Output Voltage | 14.0–16.0 V at 1–150 μA load; supports TFT gate-on voltage requirements with margin. |
| −15 V Output Voltage | −16.0 to −14.0 V at −1 to −150 μA load; provides gate-off bias with controlled negative swing. |
| Charge Pump Frequency | 60–140 kHz; determines capacitor size selection and ripple profile for external C1–C9 network. |
| Power Efficiency | 82% at 5 mA +5 V load and ±150 μA ±15 V loads; minimizes thermal impact in space-constrained handsets. |
| Supply Current (Active) | 250–500 μA at no load; ultra-low ICC enables extended battery life in always-on display modes. |
| Shutdown Current | <5 μA at TA = 25°C; critical for zero-power display sleep states in cellular phones. |
Pinout & Package
The ADM8839ACPZ-REEL is housed in a 20-lead LFCSP_VQ (4 mm × 4 mm, very thin quad) package with exposed paddle for thermal dissipation. Pin 1 indicator is marked on top surface; pins 1/8 are tied to VCC, pins 9/18 to GND, requiring PCB trace connections per datasheet layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 1, 8) | Positive Supply Input | 3 V main input; must be decoupled with 2.2 μF capacitor and electrically tied together on PCB. |
| +5VOUT (Pin 4) | LDO-Regulated Output | Stable 5 V supply for LCD controller; requires 2.2 μF output capacitor for ripple suppression. |
| +15VOUT (Pin 10) | Tripler Output | +15 V gate-on voltage for TFT source drivers; needs 0.22 μF capacitor to ground. |
| −15VOUT (Pin 17) | Inverter Output | −15 V gate-off voltage; sequenced to ramp before +15 V to prevent latch-up in TFT panels. |
| SHDN (Pin 7) | Active-Low Shutdown Control | Drives internal discharge circuit to safely collapse all outputs to 0 V when asserted low. |
| LDO_ON/OFF (Pin 6) | LDO Selection Logic | High = internal LDO regulates +5VOUT; low = isolates internal LDO for external LDO integration. |
| C1+/C1− (Pins 19, 20) | Main Doubler Capacitor Interface | Connects to 2.2 μF flying capacitor; defines charge transfer efficiency and ripple of +5VOUT. |
| C2+/C2−, C3+/C3−, C4+/C4− (Pins 13/14, 11/12, 15/16) | Tripler/Inverter Flying Capacitors | Each pair connects to 0.22 μF capacitor; sets gain accuracy and transient response of ±15 V rails. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output charge pump | Generates +5 V, +15 V, and −15 V from single 3 V rail-eliminates need for multiple DC/DC converters in TFT handhelds. |
| Green Idle™ load-sensing oscillator | Reduces +5 V supply current to 250–500 μA at light load by enabling charge pump only during active delivery cycles. |
| Hardwired power-up sequencing | Guarantees −15 V reaches −3 V before +15 V enables-prevents TFT gate oxide stress and display artifacts. |
| LDO_ON/OFF configurable regulation | Allows system-level optimization: use internal LDO for simplicity or external LDO for tighter ripple/noise control on +5VOUT. |
| Low shutdown current (<5 μA) | Enables true zero-power display sleep mode in cellular phones without compromising fast wake-up latency. |
Applications
| Mobile Phone TFT Display Power | Handheld Instrument LCD Bias |
|---|---|
|
Use Scenario: Powering gate drivers and controller in QVGA+ color TFT panels within slim-profile cellular handsets. IC Role / Device Role / Timing Role: Generates sequenced ±15 V gate bias and regulated +5 V logic supply; controls ramp timing to avoid panel damage during power-up/down. Use Value: Eliminates discrete boost/invert regulators and reduces BOM count by 3× while meeting JEDEC Class I ESD requirements. |
Use Scenario: Providing stable bias voltages for monochrome or color TFT modules in portable test equipment with battery operation. IC Role / Device Role / Timing Role: Delivers low-noise +5 V for microcontroller interface and precise ±15 V for analog front-end gate control. Use Value: Achieves 82% efficiency at 5 mA +5 V load, extending runtime beyond 12 hours on two AA cells. |
| TFT LCD Evaluation Platform | Compact Portable Medical Display |
|
Use Scenario: Reference design for evaluating TFT panel compatibility and optimizing external capacitor values (C1–C9). IC Role / Device Role / Timing Role: Demonstrates configurable LDO_ON/OFF and SHDN-controlled discharge behavior in lab validation setups. Use Value: Enables rapid iteration of ±15 V current boost configuration (up to 400 μA) using Figure 17 layout without redesign. |
Use Scenario: Driving small-format medical-grade TFT displays in ultrasound or patient monitor handhelds requiring high reliability. IC Role / Device Role / Timing Role: Supplies fault-tolerant bias rails with built-in shutdown discharge and −40°C to +85°C operation. Use Value: Meets IEC 60601 creepage/clearance requirements via LFCSP_VQ package and integrated sequencing logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT LCD bias supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1672EAP+ | Generates +5 V and ±12 V (not ±15 V); uses different capacitor topology (no LDO_ON/OFF pin); 16-pin QSOP package. | Suitable for lower-voltage TFT panels; lacks Green Idle™ and hardwired −15 V-first sequencing. | Select when ±12 V suffices and board space allows larger QSOP footprint. |
| TPS65120RGTR | Delivers +5 V, +15 V, −15 V with integrated LDO but no LDO_ON/OFF bypass; 16-pin QFN; higher 1.2 MHz switching frequency. | Offers faster transient response but no programmable sequencing delay; requires different capacitor values (0.47 μF vs. 0.22 μF). | Choose for designs needing smaller external caps and higher efficiency above 10 mA +5 V load. |
Compared with MAX1672EAP+ and TPS65120RGTR, the ADM8839ACPZ-REEL uniquely combines ±15 V precision, −15 V-first sequencing, LDO bypass flexibility, and sub-5 μA shutdown-making it optimal for legacy and cost-sensitive mobile TFT platforms where gate drive voltage margin is critical.
Availability
ADM8839ACPZ-REEL is available at Aetrix Electronics and suitable for mobile phone TFT display power, handheld instrument LCD bias, and compact portable medical display applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM8839ACPZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The ADM8839ACPZ-REEL belongs to Analog Devices' TFT LCD power management product line, engineered specifically for low-power, multi-rail bias generation in portable color display systems with stringent sequencing and ESD requirements.
FAQ
What is the primary function of the ADM8839ACPZ-REEL in a TFT LCD system?
The ADM8839ACPZ-REEL serves as a triple-output charge pump regulator that generates +5 V for the LCD controller and sequenced ±15 V for TFT gate drivers from a single 3 V supply. Its integrated LDO, Green Idle™ oscillator, and hardwired −15 V-first power-up sequence ensure reliable, low-power operation in mobile displays. The ADM8839ACPZ-REEL eliminates need for external DC/DC converters while maintaining tight voltage tolerances and low ripple.
Does the ADM8839ACPZ-REEL support external LDO integration, and how is it enabled?
Yes, the ADM8839ACPZ-REEL supports external LDO integration via the LDO_ON/OFF pin (Pin 6). When driven low (≤0.3 × VCC), the internal LDO is isolated, allowing an external LDO to regulate the +5VOUT rail and feed its output into the +5VIN pin (Pin 5) to drive the ±15 V charge pump stages. This configuration is documented in Figure 17 of the ADM8839ACPZ-REEL datasheet and enables system-level noise/ripple optimization.
What is the power-up sequencing behavior of the ADM8839ACPZ-REEL, and why is it critical?
The ADM8839ACPZ-REEL enforces strict power-up sequencing: −15 V ramps first and must reach −3 V before +15 V is enabled. This prevents TFT gate oxide overstress and display anomalies during startup. The sequence is implemented in hardware and does not require external control. This behavior is essential for reliable operation in color TFT panels used in cellular phones and handheld instruments where gate driver integrity directly impacts display lifetime.
What are the absolute maximum ratings for the ADM8839ACPZ-REEL's output pins?
The ADM8839ACPZ-REEL specifies absolute maximum ratings of 0 V to +7.0 V on +5VOUT, −17 V to +0.3 V on −15VOUT, and −0.3 V to +17 V on +15VOUT. Exceeding these limits-even momentarily-may cause permanent damage. These ratings define safe operating boundaries during transient events, hot-plug conditions, or fault scenarios, and must be respected in PCB layout and system-level protection design for the ADM8839ACPZ-REEL.
How does the Green Idle™ feature reduce power consumption in the ADM8839ACPZ-REEL?
The Green Idle™ feature in the ADM8839ACPZ-REEL dynamically disables the +5 V doubler oscillator when load current falls below threshold, reducing supply current to 250–500 μA under no load. It re-enables the oscillator only when charge delivery is needed, minimizing switching losses. This behavior is intrinsic to the ADM8839ACPZ-REEL's control logic and significantly extends battery life in always-on display modes without sacrificing transient response (<5 μs settling).
ADM8839ACPZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 2.7V ~ 4.2V
- Number of Outputs:
- 3
- Voltage - Output:
- -15V, 5V, 15V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LFCSP-VQ (4x3.75)
ADM8839ACPZ-REEL FAQ
1.How can I place an order for ADM8839ACPZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8839ACPZ-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 ADM8839ACPZ-REEL reliable?
The price and inventory of ADM8839ACPZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8839ACPZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM8839ACPZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8839ACPZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8839ACPZ-REEL?
ADM8839ACPZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8839ACPZ-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 ADM8839ACPZ-REEL?
For technical support, including ADM8839ACPZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8839ACPZ-REEL requirements.
6.How does Aetrix verify that ADM8839ACPZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM8839ACPZ-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 ADM8839ACPZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM8839ACPZ-REEL?
All ADM8839ACPZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM8839ACPZ-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 ADM8839ACPZ-REEL part is unused and in its original packaging.
Return procedure for ADM8839ACPZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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