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Analog Devices Inc. LTC3220EPF-1#PBF
- Part No.:
- LTC3220EPF-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-UFQFN Exposed Pad
- Datasheet:
-
LTC3220EPF-1#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 20MA 28UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
LTC3220EPF-1#PBF from Analog Devices (formerly Linear Technology) is an 18-channel universal LED driver IC with integrated multi-mode charge pump, I²C-controlled 6-bit linear DACs, and independent blinking/gradation per channel. It delivers up to 20mA per channel (360mA total), operates from 2.9V–5.5V input, and features automatic 1x/1.5x/2x mode switching for optimal efficiency in keypad backlighting and QVGA+ display systems.
For engineers reviewing the LTC3220EPF-1#PBF datasheet, LTC3220EPF-1#PBF pinout, LTC3220EPF-1#PBF application, or LTC3220EPF-1#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready availability details - all specific to the -1 variant with I²C address 0011101 and industrial-grade temperature range.
Technical Context
The LTC3220EPF-1#PBF integrates a 850kHz non-overlapping switched-capacitor charge pump with three operating modes (1x direct pass-through, 1.5x series-parallel, 2x voltage-doubling), dynamically selected based on dropout detection at any ULED output. Each of the 18 current sources includes a dedicated 6-bit linear DAC (64-step resolution) and independent control bits for blink, gradation, GPO mode, and enable/disable.
It uses a single 2-wire I²C interface (slave-only, address 0011101) to configure all registers, supports parallel write to all 18 ULED channels, and implements slew-limited switching on flying capacitor pins (C1P/C1M/C2P/C2M) to minimize conducted/radiated EMI. Internal soft-start limits inrush current during mode transitions and power-up.
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 system rails without external LDO. |
| Total Output Current | Up to 360mA - enables full drive of 18×20mA LEDs simultaneously for high-brightness multi-zone lighting. |
| ULED Current Accuracy | ±1.5% matching between any two outputs at 50% full scale - ensures uniform brightness across display segments. |
| Charge Pump Efficiency | Up to 91% - minimizes thermal load and extends battery life in portable devices. |
| I²C Address | 0011101 (7-bit) - distinct from LTC3220 (0011100), enabling co-location of both variants on same bus. |
| Operating Temp | –40°C to +85°C - qualified for industrial and consumer handheld applications including video phones and ruggedized UIs. |
| Package | 28-lead 4mm × 4mm UTQFN, 0.55mm height - ultra-thin footprint ideal for space-constrained mobile PCBs. |
Pinout & Package
28-lead ultrathin QFN (UTQFN) package, 4mm × 4mm, 0.55mm profile, exposed pad (Pin 29) soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ULED1–ULED18 (Pins 1–9, 13–21) | Universal current source outputs | Each programmable 0–20mA sink with 6-bit DAC; configurable as open-drain GPO with strong pull-down or current-limited mode. |
| VIN (Pin 24) | Main power input | Supplies entire IC and charge pump; requires 2.2µF ceramic bypass capacitor to ensure stable operation under dynamic load. |
| CPO (Pin 28) | Charge pump output | Regulated boosted rail (up to 5.1V); powers all ULED channels; requires 4.7µF ceramic output capacitor for ripple suppression. |
| C1P/C1M/C2P/C2M (Pins 27, 23, 26, 22) | Flying capacitor connections | Interface internal charge pump stages; each pair requires 2.2µF X5R/X7R ceramic capacitor for optimal mode-switching efficiency. |
| SCL/SDA (Pins 11/12) | I²C serial interface | Standard 2-wire bus (400kHz max); logic levels referenced to DVCC; external pull-ups required. |
| RST (Pin 25) | Active-low reset | Asynchronously clears all registers and forces shutdown; also used for hardware-initiated recovery after fault conditions. |
| DVCC (Pin 10) | Digital supply reference | Sets logic threshold for SCL/SDA/RST; must be ≥1.5V; UVLO triggers register reset if dropped below 1V. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching charge pump modes | 1x → 1.5x → 2x transition triggered by ULED dropout detection; resets to 1x after I²C register update or gradation completion - eliminates manual mode selection and improves system robustness. |
| Independent per-channel control | Each ULED output supports simultaneous configuration of brightness (64-step DAC), blink period (1.25/2.5s), gradation ramp time (0.24/0.48/0.96s), and GPO mode - enables complex UI animations without host CPU overhead. |
| Slew-limited flying capacitor switching | Controlled edge rates on C1P/C1M/C2P/C2M reduce peak EMI by >10dB compared to unslew-limited charge pumps - simplifies EMC compliance in compact handheld designs. |
| Internal soft-start | 125µs linear current ramp during 1.5x/2x mode entry prevents input rail droop and avoids false UVLO triggering in battery-powered systems. |
| Short-circuit & thermal protection | Indefinite CPO short-circuit tolerance plus junction temperature monitoring - allows safe operation under fault conditions without external circuitry. |
Applications
| Keypad Backlighting | QVGA+ Display Lighting |
|---|---|
Use Scenario: Illuminating alphanumeric keypads in industrial handheld terminals with variable ambient light conditions. IC Role / Device Role / Timing Role: LED driver providing independent brightness control per key group via I²C, synchronized to user interaction events. Use Value: Enables localized dimming and animated feedback (e.g., key press glow-up) using only one IC and five external capacitors - reduces BOM count and layout area by 40% vs discrete solutions. |
Use Scenario: Driving segmented backlight zones behind QVGA+ LCD panels in video phones and portable medical displays. IC Role / Device Role / Timing Role: Multi-channel current source delivering matched 20mA to 18 LED strings, with gradation timing precisely controlled via REG19. Use Value: Achieves <1.5% current matching across zones, ensuring uniform luminance without software calibration - critical for diagnostic image clarity. |
| RGB Indicator Arrays | General/Miscellaneous Lighting |
Use Scenario: Controlling tri-color RGB status indicators in networking equipment with programmable color sequences. IC Role / Device Role / Timing Role: Three ULED channels assigned to R/G/B LEDs, driven with synchronized blink/gradation via shared REG19 settings. Use Value: Supports smooth hue transitions (e.g., green→yellow→red) using hardware-ramped current - eliminates microcontroller PWM timing jitter and reduces firmware complexity. |
Use Scenario: Providing adjustable ambient lighting in smart home controllers and automotive infotainment bezels. IC Role / Device Role / Timing Role: Universal current source configured in GPO mode for driving external MOSFETs or discrete LEDs beyond 20mA capability. Use Value: Leverages ULED pins as programmable open-drain drivers with selectable strong-pull-down or current-limit modes - extends functionality without adding driver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3728-QFLS4-TR | 28-channel, 40mA/channel, SPI interface, no auto charge pump mode switching | Higher channel count and current, but requires external boost converter and lacks dynamic mode optimization | Choose when >18 channels or >20mA/channel is needed; accept added board area and complexity for higher brightness. |
| MAX20050ATG/V+T | 4-channel, 150mA/channel, CAN/LIN-compatible, integrated diagnostics | Automotive AEC-Q100 qualified, supports functional safety, but fewer channels and no I²C interface | Choose for automotive body electronics requiring ASIL-B compliance; not suitable for consumer display backlighting due to channel count and protocol mismatch. |
Compared with IS31FL3728-QFLS4-TR and MAX20050ATG/V+T, the LTC3220EPF-1#PBF uniquely balances 18-channel integration, autonomous charge pump optimization, and I²C simplicity - making it optimal for space-constrained, battery-sensitive consumer displays where efficiency and firmware offload matter most.
Availability
LTC3220EPF-1#PBF is available at Aetrix Electronics and suitable for keypad backlighting, QVGA+ display lighting, and RGB indicator arrays requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LTC3220EPF-1#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3220 family was designed specifically for compact, low-noise, multi-LED backlighting and UI lighting in portable electronics - emphasizing minimal external components, I²C configurability, and adaptive power conversion efficiency.
FAQ
What is the I²C slave address for LTC3220EPF-1#PBF?
The LTC3220EPF-1#PBF has a fixed 7-bit I²C slave address of 0011101 (0x3A in hexadecimal). This distinguishes it from the standard LTC3220 (0011100 / 0x38), allowing both variants to coexist on the same I²C bus. The R/W bit must be 0 for write operations, as the device is write-only.
How does the LTC3220EPF-1#PBF handle LED dropout conditions?
The LTC3220EPF-1#PBF monitors voltage headroom at each ULED output. When any enabled current source enters dropout (i.e., insufficient voltage to maintain programmed current), it automatically switches from 1x to 1.5x mode after ~400µs; a second dropout triggers transition to 2x mode. Mode reverts to 1x after any I²C register write, gradation ramp-down completion, or blink cycle end.
Can ULED pins on the LTC3220EPF-1#PBF be used as general-purpose outputs?
Yes - ULED1–ULED18 on the LTC3220EPF-1#PBF can operate in GPO mode by setting Bits 6 and 7 of their respective data registers (REG1–REG18) to '1'. In this mode, they function as I²C-controlled open-drain drivers, supporting either strong pull-down (≈3µA quiescent) or regulated current-limit (up to 20mA) configurations.
What capacitors are required for proper operation of the LTC3220EPF-1#PBF?
The LTC3220EPF-1#PBF requires five ceramic capacitors: one 2.2µF (X5R/X7R) on VIN, two 2.2µF capacitors across C1P–C1M and C2P–C2M (flying caps), one 4.7µF capacitor on CPO (output), and one 0.1µF capacitor on DVCC. All must be placed close to respective pins to ensure stability and low EMI.
Does the LTC3220EPF-1#PBF support independent brightness control per channel?
Yes - the LTC3220EPF-1#PBF includes 18 independent 6-bit linear DACs (64-step resolution), allowing precise 0–20mA current programming for each ULED output. Brightness is set via REG1–REG18 data bytes, and changes take effect immediately after I²C stop-bit acknowledgment and internal load pulse generation.
LTC3220EPF-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-UFQFN Exposed Pad
- Packaging:
- Tube
- 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-1#PBF FAQ
1.How can I place an order for LTC3220EPF-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3220EPF-1#PBF 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-1#PBF reliable?
The price and inventory of LTC3220EPF-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3220EPF-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3220EPF-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3220EPF-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3220EPF-1#PBF?
LTC3220EPF-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3220EPF-1#PBF 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-1#PBF?
For technical support, including LTC3220EPF-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3220EPF-1#PBF requirements.
6.How does Aetrix verify that LTC3220EPF-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3220EPF-1#PBF 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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3220EPF-1#PBF?
All LTC3220EPF-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3220EPF-1#PBF, 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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3220EPF-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3220EPF-1#PBF Tags
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