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Analog Devices Inc. ADM8845ACPZ-REEL7
- Part No.:
- ADM8845ACPZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad, CSP
- Datasheet:
-
ADM8845ACPZ-REEL7.pdf
- Description:
- IC LED DRV RGLTR PWM 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,200
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Product details
Overview
ADM8845ACPZ-REEL7 from Analog Devices is a 16-pin LFCSP charge pump LED driver IC designed to power up to six white LEDs for LCD backlighting in portable devices. It supports 2.6 V–5.5 V Li-ion input, delivers up to 30 mA per LED with ≤1% current matching, and features automatic 1×/1.5×/2× gain switching for >88% efficiency - used in dual-display cellular phones and micro-TFT color displays.
For engineers reviewing the ADM8845ACPZ-REEL7 datasheet, ADM8845ACPZ-REEL7 pinout, ADM8845ACPZ-REEL7 application, or ADM8845ACPZ-REEL7 equivalent, key selection criteria include LED current matching accuracy, fractional charge pump mode thresholds (e.g., 1.5×→2× at 3.33 V ±4%), ISET-based current programming (RSET = 7.08 kΩ for 20 mA), soft-start behavior, and dual independent shutdown control via CTRL1/CTRL2.
Technical Context
The ADM8845ACPZ-REEL7 integrates six independent current-controlled sinks with feedback pins FB1–FB6, enabling precise per-LED current regulation and 1% matching across temperature and supply voltage. Its charge pump operates at 1.5 MHz and automatically selects 1×, 1.5×, or 2× gain based on VCC and LED forward voltage headroom requirements.
Control logic interprets digital inputs CTRL1 and CTRL2 to manage main/sub display enable states and support PWM dimming (100 Hz–200 kHz) without chromatic shift. The ISET pin sets reference current (1.18 V / RSET), internally scaled 120× to drive LEDs - ensuring compliance voltage ≥0.20 V (typ.) at 20 mA/LED.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6 V to 5.5 V - compatible with single-cell Li-ion battery operation across full discharge curve. |
| Max LED Current | 30 mA per channel - guaranteed by design (not 100% production tested); enables high-brightness backlighting. |
| Current Matching | ±1% max - ensures uniform brightness across multi-LED color LCD panels without visual banding. |
| Charge Pump Efficiency | 88% typical - achieved at VCC = 3.4 V, 20 mA/LED, minimizing thermal load in space-constrained handsets. |
| Charge Pump Modes | 1×/1.5×/2× auto-switching - thresholds at 3.33 V (1.5×→2×), 4.77 V (1×→1.5×), with 40 mV hysteresis for stable mode transitions. |
| ISET Scaling Factor | 120× - converts ISET current (set by RSET to GND) into precise LED current; e.g., 167 µA ISET → 20 mA LED. |
| Shutdown Current | 5 µA - ultra-low quiescent draw during display-off states, extending battery life in always-on UIs. |
Pinout & Package
ADM8845ACPZ-REEL7 is housed in a 3 mm × 3 mm × 0.75 mm, 16-lead LFCSP (CP-16-222) with exposed paddle soldered to GND for thermal performance (θJA = 39.25°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Charge pump output | Drives anode side of all LEDs; requires 2.2 µF capacitor to GND for stability and ripple suppression. |
| ISET (Pin 3) | Bias current reference input | Sets LED current via external RSET (e.g., 7.08 kΩ → 20 mA); internal 1.18 V reference enables accurate scaling. |
| FB1–FB6 (Pins 4–9) | LED cathode current-sense terminals | Each connects to one LED cathode; enables individual current regulation and 1% matching across all six channels. |
| CTRL1 / CTRL2 (Pins 12–13) | Digital control inputs | CMOS-level pins defining main/sub display enable state (truth table) and supporting PWM dimming (100 Hz–200 kHz). |
| VCC (Pin 15) | Main supply input | Accepts 2.6–5.5 V; requires 4.7 µF decoupling capacitor to maintain charge pump regulation under dynamic load. |
| GND (Pin 10) | Ground reference | Common return for all circuitry; exposed paddle must be connected to GND plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching fractional charge pump | 1×/1.5×/2× modes dynamically selected to maximize efficiency across Li-ion voltage range (2.6–5.5 V). |
| Independent main/sub display control | CTRL1/CTRL2 enable separate on/off and PWM dimming for two display zones - critical for clamshell phone UIs. |
| Soft-start circuitry | Limits in-rush current at power-up (see Figure 13), preventing VCC droop and system reset in battery-powered designs. |
| Robust short-circuit tolerance | Continues driving remaining LEDs at programmed current even if one LED shorts - improves field reliability. |
| Low-profile package | 3 mm × 3 mm × 0.75 mm LFCSP footprint (9 mm²) fits tight mobile PCB layouts while enabling efficient heat dissipation. |
Applications
| Cellular Phone Dual Display | Micro TFT Color Display |
|---|---|
|
Use Scenario: Clamshell or slider handset with separate main (4-LED) and sub (2-LED) LCD panels requiring independent brightness control and low standby power. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL7 acts as constant-current charge pump driver, regulating LED current via FBx pins and managing zone enable/dimming via CTRL1/CTRL2 logic. Use Value: Enables simultaneous high-brightness main display and low-power sub-display operation with <1% current mismatch - eliminating visible brightness gradients. |
Use Scenario: Portable medical monitor or industrial HMI using compact color TFT with limited board area and strict thermal budget. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL7 provides regulated LED backlighting with minimal external components (4 capacitors + RSET), reducing BOM count and layout complexity. Use Value: 88% peak efficiency and 5 µA shutdown current extend battery runtime; 0.75 mm height allows integration beneath thin bezels. |
| Camera Flash Support | DSC Backlighting |
|
Use Scenario: Digital camera module requiring brief high-current flash (60 mA/LED) alongside standard display backlighting. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL7 configures parallel FBx pins (e.g., FB1+FB2) to double sink current for flash LEDs while retaining main display control. Use Value: Eliminates need for separate flash driver IC; leverages same RSET and charge pump architecture for both functions - simplifying power tree. |
Use Scenario: Compact digital still camera with color LCD viewfinder needing uniform edge-lit backlight and smooth dimming response. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL7 drives 4–6 white LEDs with PWM-dimming via CTRL1/CTRL2, maintaining consistent CCT across 0–100% brightness. Use Value: 100 Hz–200 kHz PWM dimming avoids visible flicker and eliminates chromaticity shift - preserving accurate color reproduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | Uses I²C interface for brightness control; no auto-gain charge pump - fixed 1.5× boost only. | Requires MCU firmware integration; less suitable for simple GPIO-only systems. | Choose LM3530TMX/NOPB when programmable dimming curves and fault reporting via I²C are needed. |
| TPS61165DRVR | Single-output boost converter (not multi-channel); supports up to 30 mA total, not per LED. | Limited to monochrome or single-zone backlighting; no independent main/sub control. | Choose TPS61165DRVR for cost-sensitive, single-display applications where per-LED matching is unnecessary. |
Compared with LM3530TMX/NOPB and TPS61165DRVR, the ADM8845ACPZ-REEL7 uniquely delivers six independently regulated current sinks with auto-switching charge pump gain - making it the only option supporting dual-zone, high-matching backlighting in a single 3×3 mm package without serial interface overhead.
Availability
ADM8845ACPZ-REEL7 is available at Aetrix Electronics and suitable for cellular phone dual-display modules, micro-TFT color displays, DSC backlighting, and camera flash subsystems requiring stable component supply and long-term production continuity.
Supply support for ADM8845ACPZ-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, serving precision instrumentation, communications, and power management markets since 1965.
The ADM8845ACPZ-REEL7 belongs to Analog Devices' dedicated LCD backlight driver product line, engineered specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, multi-zone LED current regulation.
FAQ
What is the maximum number of LEDs the ADM8845ACPZ-REEL7 can drive simultaneously?
The ADM8845ACPZ-REEL7 can drive up to six white LEDs simultaneously - four assigned to the main display (FB1–FB4) and two to the sub display (FB5–FB6). Each LED channel supports up to 30 mA with ≤1% current matching, and unused FBx pins may be left floating or tied to GND without affecting operation.
How does the ADM8845ACPZ-REEL7 achieve 1% LED current matching?
The ADM8845ACPZ-REEL7 achieves ≤1% LED current matching through six independent current-controlled sinks, each sensing its respective LED current via dedicated FBx pins and referencing a common 1.18 V ISET voltage. This architecture maintains matching across temperature (−40°C to +85°C) and supply voltage (2.6 V to 5.5 V), as verified in Figures 5 and 6 of the Rev. D datasheet.
Can the ADM8845ACPZ-REEL7 support PWM dimming without external components?
Yes - the ADM8845ACPZ-REEL7 supports direct PWM dimming via its CTRL1 and CTRL2 pins, accepting 100 Hz–200 kHz digital signals to modulate main and/or sub display brightness. No external RC filters or DACs are required; duty cycle directly controls average LED current while preserving color consistency.
What is the purpose of the exposed paddle on the ADM8845ACPZ-REEL7 package?
The exposed paddle on the ADM8845ACPZ-REEL7 must be soldered to the PCB ground plane to ensure proper thermal dissipation (θJA = 39.25°C/W) and electrical stability. It is not optional - failure to connect it degrades efficiency, increases junction temperature, and risks thermal shutdown or long-term reliability issues.
Does the ADM8845ACPZ-REEL7 require different external capacitors for each charge pump mode?
No - the ADM8845ACPZ-REEL7 uses the same external capacitor set (C1 = 1 µF, C2 = 1 µF, C3 = 2.2 µF, C4 = 4.7 µF) across all 1×, 1.5×, and 2× charge pump modes. These values are optimized for stability and ripple suppression regardless of operating gain, as confirmed in Table 1 and Figure 11–15 of the datasheet.
ADM8845ACPZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 2.6V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.5MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LFCSP-VQ (3x3)
ADM8845ACPZ-REEL7 FAQ
1.How can I place an order for ADM8845ACPZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8845ACPZ-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 ADM8845ACPZ-REEL7 reliable?
The price and inventory of ADM8845ACPZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8845ACPZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM8845ACPZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8845ACPZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8845ACPZ-REEL7?
ADM8845ACPZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8845ACPZ-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 ADM8845ACPZ-REEL7?
For technical support, including ADM8845ACPZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8845ACPZ-REEL7 requirements.
6.How does Aetrix verify that ADM8845ACPZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM8845ACPZ-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 ADM8845ACPZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM8845ACPZ-REEL7?
All ADM8845ACPZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8845ACPZ-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 ADM8845ACPZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM8845ACPZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM8845ACPZ-REEL7 Tags
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BCR402RE6327HTSA1
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