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Analog Devices Inc. ADM8839ACPZ-REEL7
- Part No.:
- ADM8839ACPZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 20-VFQFN Exposed Pad, CSP
- Datasheet:
-
ADM8839ACPZ-REEL7.pdf
- Description:
- IC REG CONV TFT LCD 3OUT 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,437
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Product details
Overview
ADM8839ACPZ-REEL7 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, delivers up to 20 mA on the +5 V LDO output and ±150 μA on each rail, and features Green Idle™ load-sensing oscillator control for power efficiency in mobile phones.
For engineers reviewing the ADM8839ACPZ-REEL7 datasheet, ADM8839ACPZ-REEL7 pinout, ADM8839ACPZ-REEL7 application, or ADM8839ACPZ-REEL7 equivalent, this device is selected for TFT gate drive sequencing, low-quiescent-current panel power, and compact 4 mm × 4 mm LFCSP packaging with verified shutdown and external LDO bypass capability.
Technical Context
The ADM8839ACPZ-REEL7 integrates a voltage doubler (for +5 V), tripler (for +15 V), and inverter-tripler (for −15 V), all driven by an internal 60–140 kHz oscillator. Its power-up sequence enforces −15 V ramp before +15 V enablement (tDELAY = 600 μs) to prevent TFT panel latch-up.
It supports two configurations: standard mode (VOUT → +5VIN) delivering ±150 μA per rail, and current-boost mode (VOUT connected to +5VIN) enabling up to ±400 μA per rail with output voltage rising to ±16.5 V at no load. The LDO_ON/OFF pin selects internal or external 5 V regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| +5 V Output Voltage | 4.9–5.1 V at 10 μA–20 mA load; tight ±2% regulation ensures stable LCD controller supply. |
| +15 V / −15 V Output | +14.0–16.0 V and −16.0–−14.0 V at ±1 μA–±150 μA; meets TFT gate driver voltage tolerance. |
| Supply Current (Active) | 250–500 μA typical at 3 V; enables >100-hour battery life in always-on display modes. |
| Shutdown Current | <5 μA; allows deep sleep during screen-off without compromising fast wake-up. |
| Charge Pump Frequency | 60–140 kHz; balances capacitor size (2.2 μF/0.22 μF) and EMI in handheld RF environments. |
| Transient Response | <5 μs settling time for 10 μA → 8 mA step; maintains image fidelity during rapid frame updates. |
| Power Efficiency | 82% at 5 mA (+5 V) and ±150 μA (±15 V); minimizes thermal load in sealed mobile enclosures. |
Pinout & Package
The ADM8839ACPZ-REEL7 is housed in a 20-lead LFCSP_VQ (4 mm × 4 mm, 0.8 mm max height), RoHS-compliant lead frame chip scale package with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 1, 8) | Positive Supply Input | 3 V main input; pins must be shorted on PCB for low-impedance supply path. |
| +5VOUT (Pin 4) | Regulated 5 V Output | LDO-stabilized output for LCD controller logic; requires 2.2 μF decoupling. |
| +15VOUT (Pin 10) | Tripled Positive Output | Derived from +5VOUT; supplies TFT source/gate drivers; needs 0.22 μF. |
| −15VOUT (Pin 17) | Inverted-Tripled Negative Output | Sequenced to rise before +15VOUT to prevent panel damage. |
| SHDN (Pin 7) | Active-Low Shutdown Control | CMOS-compatible input; pulls outputs to GND via internal discharge circuit. |
| LDO_ON/OFF (Pin 6) | Internal/External LDO Selection | Logic high enables internal LDO; low disconnects it for external regulation. |
| GND (Pins 9, 18) | Ground Reference | Dual ground pins require low-inductance tie to minimize noise coupling. |
| C1+/C1− (Pins 19, 20) | Main Charge Pump Capacitor Terminals | Connect 2.2 μF flying capacitor; defines doubler efficiency and ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Rail Generation | Simultaneous +5 V, +15 V, and −15 V from one 3 V source eliminates need for multiple regulators or inductors. |
| Green Idle™ Load Sensing | Oscillator activates only when 5 V output capacitance requires recharge, cutting quiescent current during static display. |
| Controlled Power Sequencing | Hardware-enforced −15 V rise before +15 V enables safe TFT panel startup without gate oxide stress. |
| Configurable ±15 V Drive | Standard (±150 μA) or current-boost (±400 μA) modes support diverse panel sizes and refresh rates. |
| External LDO Bypass | LDO_ON/OFF pin allows substitution of higher-performance external LDOs for tighter 5 V ripple or higher current. |
Applications
| Mobile Phone TFT Displays | Hand-Held Instrument LCDs |
|---|---|
Use Scenario: Powering active-matrix color TFT panels in GSM/UMTS smartphones with 3 V Li-ion battery supply. IC Role / Device Role / Timing Role: Generates gate driver voltages (+15 V/−15 V) and controller logic supply (+5 V) with sequenced ramp-up to avoid panel damage. Use Value: Eliminates discrete DC/DC converters and reduces BOM count by 3× while meeting 5 μs transient response for video playback. |
Use Scenario: Biasing monochrome or color TFT screens in portable multimeters, oscilloscopes, and data loggers. IC Role / Device Role / Timing Role: Provides regulated, low-noise ±15 V rails for analog front-end multiplexers and +5 V for microcontroller peripherals. Use Value: Enables >10-year shelf life with <5 μA shutdown current and stable output across −40°C to +85°C industrial temperature range. |
| Portable Medical Monitors | Automotive Infotainment Panels |
Use Scenario: Driving diagnostic-grade TFT displays in battery-powered patient monitors and ultrasound handhelds. IC Role / Device Role / Timing Role: Supplies tightly regulated +5 V for ADC reference and ±15 V for precision op-amp biasing in analog signal chains. Use Value: Delivers <10 mVp-p ripple on +5 V output and <50 mVp-p on ±15 V rails-critical for low-noise medical imaging. |
Use Scenario: Powering infotainment TFTs in automotive head units where EMI and thermal constraints limit inductor use. IC Role / Device Role / Timing Role: Replaces inductive boost/inverters with capacitor-based solution; operates reliably under 4.2 V battery transients. Use Value: Achieves 82% efficiency at 3 V input and passes automotive EMC tests due to fixed-frequency 100 kHz switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1674ESE+ | Single-output +5 V only; no ±15 V generation; uses different capacitor topology (2× 1 μF). | Suitable only for LCD logic supply-not gate drive-requiring external ±15 V sources. | Select when only 5 V bias is needed and board space permits separate ±15 V solutions. |
| TPS65120RGTR | Dual-output (+5 V, −5 V); lacks +15 V rail and TFT-specific sequencing; higher 1.2 mA quiescent current. | Targeted at smaller monochrome STN LCDs-not color TFTs-requiring lower gate drive voltage. | Choose for cost-sensitive STN applications where ±15 V is unnecessary and 5 V/−5 V suffices. |
Compared with MAX1674ESE+ and TPS65120RGTR, the ADM8839ACPZ-REEL7 uniquely integrates triple-rail generation, hardware-enforced −15 V-first sequencing, and Green Idle™ dynamic efficiency-making it the only direct fit for color TFT panels requiring simultaneous +5 V, +15 V, and −15 V from 3 V.
Availability
ADM8839ACPZ-REEL7 is available at Aetrix Electronics and suitable for mobile phone displays, hand-held instrumentation, and portable medical monitors requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ADM8839ACPZ-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, headquartered in Norwood, MA, with design centers worldwide.
The ADM8839ACPZ-REEL7 belongs to Analog Devices' TFT LCD power management product line, engineered specifically for low-power, multi-rail biasing of color thin-film transistor displays in battery-constrained portable systems.
FAQ
What is the function of the SHDN pin on the ADM8839ACPZ-REEL7?
The SHDN pin on the ADM8839ACPZ-REEL7 is an active-low digital control input that disables the internal timing generator and activates an internal discharge circuit. When pulled low, it forces all outputs (+5 V, +15 V, −15 V) to discharge to GND within milliseconds, reducing supply current to under 5 μA. This feature enables rapid, low-power sleep states in devices using the ADM8839ACPZ-REEL7 for TFT panel biasing.
Can the ADM8839ACPZ-REEL7 generate +15 V and −15 V simultaneously with correct sequencing?
Yes, the ADM8839ACPZ-REEL7 guarantees correct power sequencing: the −15 V output ramps first and must reach −3 V before the +15 V output is enabled. This hardware-controlled sequence-visible in Figure 14 of the datasheet-prevents latch-up and gate oxide stress in TFT panels. The delay between −15 V fall and +15 V rise is 600 μs, and the ADM8839ACPZ-REEL7 implements this autonomously without external timing components.
What external capacitors are required for the ADM8839ACPZ-REEL7 to operate?
The ADM8839ACPZ-REEL7 requires five external capacitors: four 0.22 μF ceramics (C2–C4, C8–C9) for the ±15 V charge pumps and one 2.2 μF ceramic (C1) for the main voltage doubler. Additionally, a 2.2 μF capacitor is needed on +5VOUT (Pin 4) for LDO stability, and optional 2.2 μF caps on VOUT (Pin 2) and +5VIN (Pin 5) depending on configuration. All values are specified in Table 1 and Figure 1 of the ADM8839ACPZ-REEL7 datasheet.
How does the Green Idle™ feature improve efficiency in the ADM8839ACPZ-REEL7?
The Green Idle™ feature in the ADM8839ACPZ-REEL7 dynamically enables the charge pump oscillator only when the +5 V output capacitor requires recharging-based on real-time load current sensing. During static display periods with light load (e.g., 10 μA), the oscillator remains off, reducing ICC to 250 μA typical. This extends battery life significantly compared to fixed-frequency charge pumps, and is a core efficiency mechanism built into the ADM8839ACPZ-REEL7's control logic.
Is the ADM8839ACPZ-REEL7 pin-compatible with other Analog Devices TFT power ICs?
No, the ADM8839ACPZ-REEL7 has a unique 20-pin LFCSP_VQ footprint and pin assignment optimized for triple-rail TFT biasing, including dedicated C1+/C1−, C2+/C2−, C3+/C3−, and C4+/C4− terminals. It is not pin-compatible with Analog Devices' ADM8039 (dual-output) or ADM8059 (single-output) families. Board layout must be designed specifically for the ADM8839ACPZ-REEL7's pinout shown in Figure 2 of its datasheet.
ADM8839ACPZ-REEL7 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-REEL7 FAQ
1.How can I place an order for ADM8839ACPZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8839ACPZ-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 ADM8839ACPZ-REEL7 reliable?
The price and inventory of ADM8839ACPZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8839ACPZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM8839ACPZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8839ACPZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8839ACPZ-REEL7?
ADM8839ACPZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8839ACPZ-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 ADM8839ACPZ-REEL7?
For technical support, including ADM8839ACPZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8839ACPZ-REEL7 requirements.
6.How does Aetrix verify that ADM8839ACPZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM8839ACPZ-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 ADM8839ACPZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM8839ACPZ-REEL7?
All ADM8839ACPZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8839ACPZ-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 ADM8839ACPZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM8839ACPZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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