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Analog Devices Inc. LTC3220EPF#TRPBF
- Part No.:
- LTC3220EPF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-UFQFN Exposed Pad
- Datasheet:
-
LTC3220EPF#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 20MA 28UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
LTC3220EPF#TRPBF from Analog Devices (formerly Linear Technology) is a 18-channel universal LED driver IC with integrated multi-mode charge pump, 6-bit linear DACs per channel, and I²C interface. It delivers up to 20mA per channel (360mA total), supports 1x/1.5x/2x charge pump modes, operates from 2.9V to 5.5V input, and targets compact backlighting and keypad illumination in space-constrained portable electronics.
For engineers reviewing the LTC3220EPF#TRPBF datasheet, LTC3220EPF#TRPBF pinout, LTC3220EPF#TRPBF application, or LTC3220EPF#TRPBF equivalent, key selection criteria include its 28-pin 4mm × 4mm UTQFN package, -40°C to +85°C temperature grade, I²C address 0011100, automatic dropout-driven mode switching, and 64-step linear brightness control per ULED output.
Technical Context
The LTC3220EPF#TRPBF implements an adaptive switched-capacitor charge pump with three fixed-gain modes (1x, 1.5x, 2x) that auto-switch based on real-time LED current source dropout detection - not voltage thresholds alone. Mode transitions occur after ~400µs of sustained dropout and reset to 1x upon any I²C register write or gradation completion.
Each of its eighteen ULED pins functions as either a precision current source (0–20mA in 64 linear steps) or an I²C-controlled open-drain general-purpose output (GPO), with independent blink (1.25s/2.5s period), gradation (0.24s/0.48s/0.96s ramp), and on/off control via dedicated registers REG1–REG18 and REG19.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 5.5V - supports single-cell Li-ion, Li-poly, or 3.3V/5V rail operation without external LDO. |
| Total Output Current | Up to 360mA - enables full drive of 18×20mA LEDs or mixed configurations (e.g., 6 main + 4 RGB). |
| Charge Pump Modes | 1x (direct VIN→CPO), 1.5x (up to 4.6V), 2x (up to 5.1V) - dynamically selected to maintain LED current regulation while maximizing efficiency. |
| LED Current Accuracy | ±1.5% matching between any two outputs at 50% full scale - ensures uniform brightness across multi-LED arrays. |
| I²C Interface | Standard-mode (400kHz max), 7-bit address 0011100 - compatible with most microcontrollers; no pull-up voltage dependency on VIN. |
| Package | 28-lead UTQFN (4mm × 4mm, 0.55mm height) with exposed thermal pad - optimized for thin portable designs and thermal dissipation. |
| Operating Temp | -40°C to +85°C (E-grade) - qualified for consumer and industrial handheld applications including video phones and feature keypads. |
Pinout & Package
28-lead ultrathin QFN (UTQFN), 4mm × 4mm, 0.55mm profile, exposed thermal pad (Pin 29 = GND). Pin pitch: 0.5mm. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ULED1–ULED18 (Pins 1–9, 13–21) | Universal current source / GPO outputs | Each provides 0–20mA programmable current or open-drain logic-level output; dropout detection disabled in GPO mode. |
| VIN (Pin 24) | Main power input | Supplies entire IC; requires 2.2µF ceramic bypass capacitor; powers charge pump and internal logic. |
| DVCC (Pin 10) | Digital I/O supply | Sets logic reference for SCL/SDA/RST; UVLO threshold = 1V; requires 0.1µF ceramic decoupling. |
| SCL / SDA (Pins 11, 12) | I²C serial interface | Standard 2-wire bus; DVCC-referenced inputs; support 400kHz clock; no external level shifters needed. |
| RST (Pin 25) | Asynchronous reset | Active-low shutdown; clears all registers and disables charge pump; overrides I²C control. |
| CPO (Pin 28) | Charge pump output | Regulated high-voltage rail for all ULEDs; requires 4.7µF ceramic output capacitor; short-circuit protected. |
| C1P/C1M/C2P/C2M (Pins 27, 23, 26, 22) | Flying capacitor connections | Support 2.2µF ceramic flying caps; slew-limited switching reduces EMI; critical for charge pump stability. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching multi-mode charge pump | Eliminates need for external boost converter; maintains >91% efficiency across input/LED voltage combinations by selecting optimal gain mode in real time. |
| 18 independent 6-bit linear DACs | Enables precise, channel-specific brightness tuning (64 steps, 0.314mA LSB) without requiring external resistors or PWM controllers. |
| Slew-limited flying capacitor drivers | Reduces conducted/radiated EMI - critical for meeting FCC/CE emissions limits in handheld RF-sensitive devices. |
| GPO mode with strong pull-down option | Allows reuse of ULED pins as logic-level switches consuming only ~3µA quiescent current when configured for low-power GPIO. |
| Integrated soft-start & short-circuit protection | Prevents inrush current during mode transitions and protects CPO from damage during LED short events - no external circuitry required. |
Applications
| Video Phone Backlighting | Keypad Illumination |
|---|---|
Use Scenario: Driving QVGA+ display backlight with 12–18 white LEDs in series-parallel configuration. IC Role / Device Role / Timing Role: Primary LED current controller and voltage booster; manages dynamic brightness scaling via I²C during UI transitions. Use Value: Delivers uniform luminance across all segments using ±1.5% current matching and eliminates flicker via 0.24s gradation ramp. | Use Scenario: Illuminating alphanumeric keypads in ruggedized industrial handsets with variable ambient light conditions. IC Role / Device Role / Timing Role: Multi-channel current source with independent on/off and blink control per key group. Use Value: Enables user-configurable blink patterns (1.25s/2.5s) and low-power standby via GPO mode with <3µA quiescent draw. |
| RGB Indicator Lighting | Multi-Zone Status Panels |
Use Scenario: Powering 4×RGB LEDs (12 channels) for status indication with color mixing capability. IC Role / Device Role / Timing Role: Precision current driver with per-channel 6-bit DAC control enabling accurate RGB intensity balancing. Use Value: Achieves consistent color point across temperature via matched current sources and internal reference. | Use Scenario: Controlling discrete LED zones (e.g., battery, signal strength, connectivity) on medical or test equipment front panels. IC Role / Device Role / Timing Role: Centralized LED management IC interfacing to host MCU via I²C; handles all timing-critical functions (blink, gradation). Use Value: Reduces firmware overhead by offloading LED timing logic; supports asynchronous reset for fail-safe panel blanking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3729-QFLS4-TR | 28-channel, 40mA/channel, I²C, same 4mm × 4mm QFN but 32-pin; no auto charge pump mode switching. | Higher per-channel current and count; requires external boost if VF > VIN; better suited for high-brightness signage. | Select IS31FL3729 when >20mA/channel or >18 channels are required; avoid if adaptive voltage boosting is essential. |
| MAX20057ATG/V+T | 12-channel, 30mA/channel, SPI interface, integrated 5.5V boost converter, 24-pin TQFN; no gradation or blink registers. | Fixed 2x boost only; higher integration (no external flying caps); lacks built-in animation features. | Select MAX20057 for automotive-grade designs needing AEC-Q100 qualification and SPI compatibility; not drop-in for I²C-based gradation systems. |
Compared with IS31FL3729-QFLS4-TR and MAX20057ATG/V+T, the LTC3220EPF#TRPBF uniquely combines adaptive charge pump gain selection, per-channel gradation timing, and GPO reconfigurability in a 28-pin footprint - making it optimal for cost- and space-sensitive portable UI lighting where dynamic voltage headroom management is critical.
Availability
LTC3220EPF#TRPBF is available at Aetrix Electronics and suitable for video phone backlighting, keypad illumination, and RGB indicator lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3220EPF#TRPBF 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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear IC products, including robust quality systems and long-term product roadmaps.
The LTC3220EPF#TRPBF belongs to Linear's high-integration LED driver family designed specifically for ultra-thin portable electronics requiring minimal external components, low EMI, and intelligent current control without MCU intervention.
FAQ
What is the I²C slave address for the LTC3220EPF#TRPBF?
The LTC3220EPF#TRPBF uses the factory-programmed 7-bit I²C address 0011100 (0x38 in hexadecimal). This distinguishes it from the LTC3220-1 variant (0011101 / 0x39). The R/W bit must be 0 (write-only operation), so the full byte sent is 0x70. No address conflict occurs with other devices using standard I²C addressing schemes.
Does the LTC3220EPF#TRPBF require external flying capacitors, and what values are recommended?
Yes, the LTC3220EPF#TRPBF requires four external ceramic flying capacitors: two 2.2µF X5R/X7R devices connected between C1P–C1M and C2P–C2M. These are mandatory for charge pump operation. A 4.7µF X5R/X7R capacitor is also required from CPO to GND. All capacitors must be placed close to their respective pins to ensure stability and low EMI.
How does the LTC3220EPF#TRPBF handle thermal overload or short-circuit conditions?
The LTC3220EPF#TRPBF includes internal thermal shutdown and CPO short-circuit protection. If junction temperature exceeds 125°C, the device disables the charge pump and ULED outputs until temperature falls below the hysteresis threshold. CPO short-circuit detection triggers at 0.4–1.3V and limits output current to 10–30mA - protecting both the IC and connected LEDs without external circuitry.
Can unused ULED pins on the LTC3220EPF#TRPBF be left floating?
No. Unused ULED pins (ULED1–ULED18) must be connected to GND. Leaving them floating may cause unpredictable current leakage, increased noise coupling, or unintended activation in GPO mode. Grounding ensures defined logic state, minimizes EMI susceptibility, and prevents parasitic turn-on during startup or reset sequences.
What is the minimum programmable LED current step size for the LTC3220EPF#TRPBF?
The LTC3220EPF#TRPBF provides a minimum programmable LED current step of 0.314mA (LSB of the 6-bit linear DAC), with full-scale current specified as 18–22mA (typical 20mA) per channel at ULED = 1V. The smallest non-zero current is 0.395mA when REGx is set to 0b00000001 - verified across the full -40°C to +85°C operating range.
LTC3220EPF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- -
- Number of Outputs:
- 18
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- 850kMz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-UTQFN (4x4)
LTC3220EPF#TRPBF FAQ
1.How can I place an order for LTC3220EPF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3220EPF#TRPBF 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 LTC3220EPF#TRPBF reliable?
The price and inventory of LTC3220EPF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3220EPF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3220EPF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3220EPF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3220EPF#TRPBF?
LTC3220EPF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3220EPF#TRPBF 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 LTC3220EPF#TRPBF?
For technical support, including LTC3220EPF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3220EPF#TRPBF requirements.
6.How does Aetrix verify that LTC3220EPF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3220EPF#TRPBF 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 LTC3220EPF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3220EPF#TRPBF?
All LTC3220EPF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3220EPF#TRPBF, 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 LTC3220EPF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3220EPF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3220EPF#TRPBF Tags
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