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Analog Devices Inc. ADM8845ACPZ-REEL
- Part No.:
- ADM8845ACPZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad, CSP
- Datasheet:
-
ADM8845ACPZ-REEL.pdf
- Description:
- IC LED DRV RGLTR PWM 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,571
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Product details
Overview
ADM8845ACPZ-REEL from Analog Devices is a 1×/1.5×/2× fractional charge pump LED driver IC designed to power up to six white LEDs for LCD backlighting in portable devices. It operates from 2.6 V to 5.5 V (Li-ion), delivers up to 30 mA per LED with ≤1% current matching, and achieves up to 88% power efficiency. It supports independent main/sub display control via CTRL1/CTRL2 pins and integrates soft-start and low-power shutdown.
For engineers reviewing the ADM8845ACPZ-REEL datasheet, ADM8845ACPZ-REEL pinout, ADM8845ACPZ-REEL application, or ADM8845ACPZ-REEL equivalent, key selection criteria include input voltage range compatibility (2.6–5.5 V), fractional charge pump gain switching thresholds (e.g., 1.5×↔2× at 3.33 V ±4%), ISET-based current programming (RSET = 7.08 kΩ for 20 mA/LED), FBx pin compliance (0.2–0.3 V), and CP-16-222 LFCSP package constraints (3 mm × 3 mm, 0.75 mm height).
Technical Context
The ADM8845ACPZ-REEL implements an auto-switching 1×/1.5×/2× charge pump controlled by internal gain selection logic that responds to VCC level-transitioning between modes at precisely defined thresholds (e.g., 1×→1.5× at 4.77 V ±4%). It uses six independent current-controlled sinks tied to FB1–FB6, each regulated against a 1.18 V ISET reference scaled by 120×, enabling precise per-LED current setting and <1% matching across temperature (−40°C to +85°C) and supply voltage (2.6–5.5 V).
Digital control is implemented via two 3 V CMOS-compatible inputs (CTRL1, CTRL2), supporting four discrete shutdown states (main/sub on/off combinations) and PWM dimming (100 Hz–200 kHz) without chromatic shift. Soft-start limits in-rush current during power-up, and the exposed paddle (EP) must be connected to GND for thermal and electrical integrity.
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 regulation. |
| Max LED Current per Channel | 30 mA - guaranteed by design (not 100% production tested); enables high-brightness backlighting. |
| Current Matching Accuracy | ±1% - ensures uniform luminance across multi-LED color LCD panels. |
| Charge Pump Efficiency | 88% max - achieved at VCC = 3.4 V, 20 mA/LED, minimizing thermal load in space-constrained handsets. |
| ISET Reference Voltage | 1.18 V - sets bias current (ISET = 1.18 V / RSET); defines LED current as ILED = 120 × ISET. |
| Flying Capacitor Frequency | 1.5 MHz - determines size of external C1/C2 (1 µF each) and minimizes EMI in RF-sensitive mobile designs. |
| FBx Pin Compliance Voltage | 0.2 V (typ), 0.3 V (max) - minimum headroom required across current sinks to maintain regulation and matching. |
| Shutdown Current | 5 µA - enables ultra-low-power standby in always-on display subsystems. |
Pinout & Package
ADM8845ACPZ-REEL is housed in a 16-lead LFCSP (CP-16-222) package measuring 3 mm × 3 mm × 0.75 mm with an exposed paddle (EP) that must be soldered to GND for thermal dissipation and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Charge pump output node | Drives anode side of all LEDs; requires 2.2 µF capacitor to GND for stability and ripple suppression. |
| C2+, C2− (Pins 2, 11) | Flying capacitor connections | Form second stage of 1.5×/2× charge pump; C2 = 1 µF ceramic, placed adjacent to IC for low-ESL path. |
| ISET (Pin 3) | Bias current reference input | Sets global LED current via RSET to GND; ILED = 120 × (1.18 V / RSET); tolerance directly impacts brightness accuracy. |
| FB1–FB6 (Pins 4–9) | LED cathode feedback terminals | Each connects to one LED cathode; internal current sinks regulate ILED individually; unused pins may float or tie to GND. |
| GND (Pin 10) | Power and signal ground | Reference for all analog circuitry; must be low-impedance connection; EP must be soldered to same plane. |
| CTRL1, CTRL2 (Pins 12, 13) | Digital control inputs | 3 V CMOS-compatible; define main/sub display enable state and accept 100 Hz–200 kHz PWM for brightness control. |
| C1+, C1− (Pins 14, 16) | Flying capacitor connections | Form first stage of charge pump; C1 = 1 µF ceramic; layout critical to minimize switching noise coupling. |
| VCC (Pin 15) | Primary power input | Accepts 2.6–5.5 V; requires 4.7 µF bulk decoupling capacitor close to pin to stabilize charge pump operation. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching fractional charge pump | Seamlessly transitions between 1×, 1.5×, and 2× gain modes based on VCC to maximize efficiency across full Li-ion range. |
| Independent main/sub display control | CTRL1/CTRL2 truth table enables four discrete on/off states-critical for dual-display handhelds like clamshell phones. |
| 1% LED current matching | Ensures consistent brightness across all six channels under varying temperature (−40°C to +85°C) and supply conditions. |
| Soft-start circuitry | Prevents in-rush current spikes at power-up, protecting flying capacitors and reducing system-level voltage droop. |
| Low-profile LFCSP package | 3 mm × 3 mm footprint and 0.75 mm height meet strict Z-height requirements in ultra-thin mobile form factors. |
| Three brightness control methods | Supports digital PWM on CTRL1/CTRL2, filtered PWM on ISET, or DC voltage on VBRIGHT-enabling flexible system integration. |
Applications
| Cellular Phone Dual Display | Micro TFT Color Display |
|---|---|
Use Scenario: Clamshell or slider phone with separate main (QVGA+) and sub (CSTN) displays requiring independent brightness control and simultaneous low-power operation. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL acts as the primary constant-current LED driver, powering up to four main-display LEDs (FB1–FB4) and one or two sub-display LEDs (FB5–FB6) with matched current and programmable dimming. Use Value: Enables seamless UI transitions between displays while maintaining uniform brightness and extending battery life via 88% peak efficiency and 5 µA shutdown current. |
Use Scenario: Portable medical monitor or industrial HMI using compact micro-TFT with high-color-fidelity backlighting. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL provides regulated current to six white LEDs arranged in main/sub groups, with FBx feedback ensuring pixel-level luminance uniformity across the display area. Use Value: Delivers <1% current matching across temperature and supply variation-critical for accurate grayscale reproduction and reduced visual artifacts in diagnostic imaging. |
| Camera Flash/Strobe Support | DSC Backlight System |
Use Scenario: Integration of auxiliary flash capability into a camera module where two FBx pins are paralleled to double per-channel current for strobe LEDs. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL reconfigures FB1+FB2 as a single 60 mA sink (via parallel connection) to drive high-intensity flash LEDs, while retaining remaining FBx for display backlight. Use Value: Eliminates need for separate flash driver IC-reducing BOM count and PCB area while leveraging existing charge pump architecture and thermal management. |
Use Scenario: Digital still camera with main LCD and status OLED requiring synchronized, flicker-free dimming across multiple brightness levels. IC Role / Device Role / Timing Role: ADM8845ACPZ-REEL drives four main-display LEDs and two sub-display LEDs using PWM on CTRL1/CTRL2, achieving 100:1 dimming ratio without color shift. Use Value: Maintains consistent white point across dimming range due to zero-to-full-current PWM operation-avoiding forward-voltage drift-induced chromaticity errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8646ETE+T | Single-output boost converter (not charge pump); fixed 2× gain; no auto-gain switching; 0.5% current matching. | Requires external inductor; better suited for higher-VF LED strings (>3.6 V); less efficient below 3.3 V. | Select when driving >4.0 Vf LEDs or needing tighter matching; avoid if board space prohibits inductor placement. |
| TPS61165DRVR | Single-output boost converter with integrated switch; 1.2 MHz switching; 1.5% current matching; no multi-display control logic. | Lacks dedicated CTRL1/CTRL2 interface for independent main/sub enable; requires external logic for dual-display sequencing. | Choose for cost-sensitive single-display systems; not suitable for clamshell or dual-screen architectures requiring native dual-control. |
Compared with MAX8646ETE+T and TPS61165DRVR, the ADM8845ACPZ-REEL uniquely combines auto-switching fractional charge pump topology, native dual-display control logic, and 1% matching in a 9 mm² LFCSP-making it optimal for space-constrained, dual-panel portable devices operating across full Li-ion voltage range.
Availability
ADM8845ACPZ-REEL is available at Aetrix Electronics and suitable for cellular phone dual-display systems, micro TFT color displays, camera flash/strobe modules, and DSC backlight systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADM8845ACPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with deep expertise in precision power management and sensor signal chains.
The ADM8845ACPZ-REEL belongs to Analog Devices' LCD backlight driver product line, engineered specifically for low-voltage, multi-display portable electronics-emphasizing efficiency across Li-ion battery discharge, minimal board area, and robust current matching for color-critical applications.
FAQ
What is the recommended RSET value for 20 mA per LED operation with the ADM8845ACPZ-REEL?
The ADM8845ACPZ-REEL requires RSET = 7.08 kΩ to deliver 20 mA per LED, calculated from the formula RSET = 120 × (1.18 V / ILED). This value is specified in Table 6 of the Rev. D datasheet and validated across −40°C to +85°C ambient. Using a 1% tolerance resistor ensures current accuracy remains within ±1.2% of target, preserving display uniformity.
How does the ADM8845ACPZ-REEL handle LED short-circuit faults?
The ADM8845ACPZ-REEL continues regulating current through remaining LEDs even if one LED shorts, because each FBx pin connects to an independent current sink. If FB3 shorts, the ADM8845ACPZ-REEL still delivers full programmed current (e.g., 20 mA) to FB1, FB2, FB4–FB6. No latch-off or fault flag is provided-the device assumes open-circuit or short-circuit LED failure is managed externally.
Can the ADM8845ACPZ-REEL drive fewer than six LEDs, and how should unused FBx pins be terminated?
Yes, the ADM8845ACPZ-REEL supports configurations with 1–6 LEDs. Unused FBx pins (e.g., FB5/FB6 when only main display is used) may be left floating or connected to GND-both are explicitly permitted in the Pin Function Descriptions (Page 5). Floating is preferred to avoid unnecessary leakage paths; GND termination adds no functional benefit but is electrically safe.
What is the maximum allowable ambient temperature when operating the ADM8845ACPZ-REEL at 30 mA per LED?
When driving six LEDs at 30 mA each (180 mA total load), the ADM8845ACPZ-REEL's maximum ambient temperature is +65°C, as shown in Figure 21 of the datasheet. Above this temperature, LED current must be derated linearly to prevent thermal shutdown or reliability degradation-e.g., at +85°C ambient, max ILED drops to ~20 mA per channel.
Does the ADM8845ACPZ-REEL support analog brightness control, and what is the required VBRIGHT voltage range?
Yes, the ADM8845ACPZ-REEL supports analog brightness control via VBRIGHT pin (using external resistor network per Figure 22). VBRIGHT accepts 0 V to 2.5 V: 0 V yields full current (e.g., 20 mA/LED), and 2.5 V yields zero current. The relationship is linear-e.g., 1.25 V produces ~10 mA/LED-enabling smooth, flicker-free dimming without PWM timing constraints.
ADM8845ACPZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-REEL FAQ
1.How can I place an order for ADM8845ACPZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8845ACPZ-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 ADM8845ACPZ-REEL reliable?
The price and inventory of ADM8845ACPZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8845ACPZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM8845ACPZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8845ACPZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8845ACPZ-REEL?
ADM8845ACPZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8845ACPZ-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 ADM8845ACPZ-REEL?
For technical support, including ADM8845ACPZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8845ACPZ-REEL requirements.
6.How does Aetrix verify that ADM8845ACPZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM8845ACPZ-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 ADM8845ACPZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM8845ACPZ-REEL?
All ADM8845ACPZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM8845ACPZ-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 ADM8845ACPZ-REEL part is unused and in its original packaging.
Return procedure for ADM8845ACPZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM8845ACPZ-REEL Tags
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