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Analog Devices Inc. ADM8843ACPZ-REEL7
- Part No.:
- ADM8843ACPZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad, CSP
- Datasheet:
-
ADM8843ACPZ-REEL7.pdf
- Description:
- IC LED DRV RGLTR PWM 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
ADM8843ACPZ-REEL7 from Analog Devices is a four-channel white LED backlight driver IC using fractional charge pump architecture (1×/1.5×/2×) to power main and sub display LEDs from 2.6 V to 5.5 V Li-ion supply. It delivers 20 mA per LED with 0.3% typical current matching, 88% peak efficiency, and supports independent digital shutdown via CTRL1/CTRL2 pins for portable color LCD applications.
For engineers reviewing the ADM8843ACPZ-REEL7 datasheet, ADM8843ACPZ-REEL7 pinout, ADM8843ACPZ-REEL7 application, or ADM8843ACPZ-REEL7 equivalent, this page provides verified technical context, exact pin functions, real-world efficiency data across Li-ion voltage range, confirmed LED current regulation accuracy, and validated alternatives for dual-display backlight systems.
Technical Context
The ADM8843ACPZ-REEL7 implements automatic gain control that dynamically selects 1×, 1.5×, or 2× charge pump mode based on input voltage thresholds (e.g., 1.5×→2× at 3.33 V), maintaining sufficient anode drive while maximizing efficiency. Its four independent current-controlled sinks regulate LED current via ISET pin (1.18 V reference) with 120× internal gain and ±5% ILED-to-ISET ratio accuracy.
It supports three brightness control methods: digital PWM applied to CTRL1/CTRL2 (100 Hz–200 kHz), DC voltage on VBRIGHT (0–2.5 V), or filtered PWM on ISET. Soft-start limits in-rush current, and shorted-LED fault tolerance preserves operation of remaining LEDs at full programmed current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6 V to 5.5 V - Supports full Li-ion battery discharge curve without external LDO. |
| LED Current per Channel | 20 mA - Programmable via RSET; stable over −40°C to +85°C with <0.1% variation. |
| Current Matching Accuracy | 0.3% typical - Ensures uniform brightness across RGB subpixels in TFT displays. |
| Charge Pump Efficiency | 88% peak - Measured at VCC = 3.4 V, 20 mA/LED, VF = 4.0 V; enables longer battery life. |
| Shutdown Current | 5 µA - Enables ultra-low-power standby in always-on sub-display modes. |
| Charge Pump Frequency | 1.5 MHz - Reduces required capacitor size (C1/C2 = 1 µF) and EMI footprint. |
| VOUT Ripple | 30 mV - Maintains stable LED bias under full load; meets micro-TFT display noise requirements. |
Pinout & Package
ADM8843ACPZ-REEL7 uses a 16-lead Lead Frame Chip Scale Package (LFCSP), 3 mm × 3 mm body, 0.75 mm height, with exposed paddle thermally and electrically connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Charge pump output node | Drives anodes of all four LEDs; requires 2.2 µF capacitor to GND for stability. |
| ISET (Pin 3) | Bias current reference input | Sets LED current via external RSET (e.g., 7.08 kΩ → 20 mA); 1.18 V internal reference. |
| FB1–FB4 (Pins 5–8) | LED cathode feedback terminals | Each connects to one LED cathode; enables individual current sensing and 0.3% matching. |
| CTRL1 / CTRL2 (Pins 12–13) | Digital control inputs | CMOS-level pins controlling main/sub display enable/shutdown and PWM brightness. |
| VCC (Pin 15) | Main power input | Accepts 2.6–5.5 V; requires 4.7 µF decoupling capacitor for charge pump stability. |
| GND (Pins 4,9,10) | Ground reference | Three dedicated ground pins minimize IR drop; exposed paddle must be soldered to GND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Fractional charge pump modes | 1×/1.5×/2× auto-switching maximizes efficiency across full Li-ion range (2.6–5.5 V). |
| Independent main/sub display control | CTRL1/CTRL2 truth table enables discrete on/off and PWM dimming for dual-display systems. |
| 0.3% LED current matching | Ensures consistent luminance across RGB subpixels-critical for color fidelity in micro-TFTs. |
| Soft-start circuitry | Limits in-rush current during power-up, preventing VCC droop and display flicker. |
| Shorted-LED fault resilience | Continues driving remaining LEDs at full programmed current if one LED fails short. |
Applications
| Cellular Phone Dual Display | Micro TFT Color Display |
|---|---|
|
Use Scenario: Main display (3 LEDs) and sub display (1 LED) in clamshell or slider phones powered by single Li-ion cell. IC Role / Device Role / Timing Role: LED current regulator and charge pump voltage booster; provides independent brightness control per display via CTRL1/CTRL2. Use Value: Eliminates need for separate boost converters; 0.3% matching prevents visible color banding between displays. |
Use Scenario: High-resolution micro-TFT in wearable devices requiring uniform edge-lit backlight with minimal board area. IC Role / Device Role / Timing Role: Constant-current sink driver with integrated 1.5× charge pump; regulates four parallel LEDs from low-voltage rail. Use Value: 3 mm × 3 mm package fits tight space constraints; 88% efficiency extends battery runtime in always-on UI modes. |
| Camera Movie Light | PDA Backlight System |
|
Use Scenario: Compact white LED array used as continuous video illumination in smartphone cameras. IC Role / Device Role / Timing Role: Precision current source with soft-start and PWM dimming; drives up to four high-brightness LEDs at 20 mA each. Use Value: 30 mV VOUT ripple ensures flicker-free video capture; 5 µA shutdown current enables instant-on activation. |
Use Scenario: Backlight for monochrome or color PDA display operating across wide temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: Temperature-stable LED driver with 0.1% current drift over −40°C to +85°C. Use Value: Maintains consistent brightness in outdoor environments; 16-pin LFCSP withstands thermal cycling in handheld form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8647ETE+T | 4-channel, 30 mA max per LED; uses inductive boost; no fractional charge pump modes. | Higher peak current supports brighter LEDs but requires external inductor and generates more EMI. | Choose MAX8647ETE+T when higher LED current (>20 mA) or tighter dimming linearity is required. |
| TPS61165DRVR | Single-output, 40 mA boost converter; supports analog + PWM dimming; no multi-display control logic. | Designed for single-display systems; lacks CTRL1/CTRL2 dual-shutdown functionality. | Choose TPS61165DRVR for cost-sensitive single-display designs where independent sub-display control is unnecessary. |
Compared with ADM8843ACPZ-REEL7, MAX8647ETE+T offers higher current headroom at the cost of inductor-based complexity and EMI, while TPS61165DRVR simplifies BOM for single-display use but removes dual-display flexibility and precision matching.
Availability
ADM8843ACPZ-REEL7 is available at Aetrix Electronics and suitable for cellular phone dual-display systems, micro TFT color displays, camera movie lights, and PDA backlight systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM8843ACPZ-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, automotive, and communications markets.
The ADM8843ACPZ-REEL7 belongs to Analog Devices' LED backlight driver product line, designed specifically for space-constrained, battery-powered portable devices requiring dual-display support, high current matching, and efficient fractional charge pump operation.
FAQ
What is the maximum LED forward voltage supported by ADM8843ACPZ-REEL7?
The ADM8843ACPZ-REEL7 supports LED forward voltages up to 4.3 V per LED in 1.5× mode and up to 5.5 V in 2× mode, as confirmed by charge pump output resistance specs (3.5 Ω in 1.5× mode, 8.0 Ω in 2× mode) and efficiency curves across VF = 3.2–4.3 V. Operation remains stable with four 4.0 V LEDs at 20 mA each when VCC ≥ 3.6 V.
How does ADM8843ACPZ-REEL7 achieve 0.3% LED current matching?
The ADM8843ACPZ-REEL7 achieves 0.3% typical LED current matching through four independent current-controlled sinks, each fed by the same ISET reference current (1.18 V / RSET) with 120× internal gain. Each FBx pin senses its respective LED cathode current directly, enabling per-channel feedback without shared current paths or resistor tolerances affecting matching.
Can ADM8843ACPZ-REEL7 drive fewer than four LEDs?
Yes, ADM8843ACPZ-REEL7 can drive one to four LEDs. Unused FBx pins (e.g., FB3/FB4 when using only two LEDs) may be left floating or tied to GND per datasheet guidance. The charge pump and current regulation remain fully functional, and matching accuracy is preserved across active channels.
What is the purpose of the exposed paddle on ADM8843ACPZ-REEL7?
The exposed paddle on ADM8843ACPZ-REEL7 must be soldered to a GND plane to serve dual roles: thermal dissipation (θJC1 = 7.5°C/W) and electrical grounding. Per datasheet Pin Configuration section, failure to connect it degrades thermal performance and may cause instability due to increased junction temperature and ground impedance.
Does ADM8843ACPZ-REEL7 support analog dimming?
Yes, ADM8843ACPZ-REEL7 supports analog dimming via DC voltage applied to VBRIGHT (0–2.5 V), which modulates ISET current linearly. At 0 V, ILED = 20 mA; at 2.5 V, ILED ≈ 0 mA. This method avoids PWM-induced EMI and is documented in Figure 22 and the "LED Brightness Control Using a DC Voltage Applied to VBRIGHT" section.
ADM8843ACPZ-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:
- 4
- Voltage - Supply (Min):
- 2.6V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- 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)
ADM8843ACPZ-REEL7 FAQ
1.How can I place an order for ADM8843ACPZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8843ACPZ-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 ADM8843ACPZ-REEL7 reliable?
The price and inventory of ADM8843ACPZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8843ACPZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM8843ACPZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8843ACPZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8843ACPZ-REEL7?
ADM8843ACPZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8843ACPZ-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 ADM8843ACPZ-REEL7?
For technical support, including ADM8843ACPZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8843ACPZ-REEL7 requirements.
6.How does Aetrix verify that ADM8843ACPZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM8843ACPZ-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 ADM8843ACPZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM8843ACPZ-REEL7?
All ADM8843ACPZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8843ACPZ-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 ADM8843ACPZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM8843ACPZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM8843ACPZ-REEL7 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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