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Analog Devices Inc. LTC3220IPF#TRPBF
- Part No.:
- LTC3220IPF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-UFQFN Exposed Pad
- Datasheet:
-
LTC3220IPF#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 20MA 28UTQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3220IPF#TRPBF 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 brightness/blink/gradation per channel. It delivers up to 20mA per channel (360mA total), operates from 2.9V–5.5V VIN, and supports 1x/1.5x/2x charge pump modes for efficient LED biasing in space-constrained portable displays.
For engineers reviewing the LTC3220IPF#TRPBF datasheet, LTC3220IPF#TRPBF pinout, LTC3220IPF#TRPBF application, or LTC3220IPF#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating temperature range (–40°C to +125°C), real-world efficiency curves, and two rigorously cross-checked alternative parts for display backlight and keypad lighting designs.
Technical Context
The LTC3220IPF#TRPBF implements a dual-phase non-overlapping 850kHz switched-capacitor charge pump with automatic mode switching: it powers up in 1x (VIN→CPO), transitions to 1.5x upon first LED dropout (targeting ≤4.6V), then to 2x upon subsequent dropout (targeting ≤5.1V). Mode resets to 1x after any I²C register update or gradation ramp completion.
Each of its 18 ULED pins functions as either a precision current source (0–20mA in 64 linear steps) or an I²C-configurable open-drain GPO; dropout detection is disabled in GPO mode. Internal 1.22V reference and slew-limited flying capacitor switching (C1P/C1M/C2P/C2M) minimize EMI while enabling >91% peak efficiency at 200mA CPO load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 5.5V - supports single-cell Li-ion and 3.3V/5V system rails without external LDO. |
| Total Output Current | Up to 360mA - enables full drive of 18×20mA LEDs or mixed RGB+white configurations. |
| Charge Pump Modes | 1x / 1.5x / 2x - auto-switching based on real-time dropout detection; forced mode control via REG0. |
| LED Current Accuracy | ±1.5% matching between any two outputs at 50% full scale - ensures uniform brightness across multi-LED arrays. |
| I²C Address | 0011100 (7-bit) - fixed slave address; LTC3220-1 variant uses 0011101; no address pins required. |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive cabin ambient environments. |
| Package | 28-lead 4mm × 4mm UTQFN (0.55mm height) with exposed pad - optimized for thermal dissipation in thin-profile handhelds. |
Pinout & Package
28-lead ultrathin QFN (PF package), 4mm × 4mm, 0.55mm profile, exposed thermal pad (Pin 29 = GND). Pin pitch: 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ULED1–ULED18 (Pins 1–9, 13–21) | Universal current source / GPO output | Configurable per-channel 0–20mA sink; disables dropout detection when set to GPO mode via REG1–REG18 Bit6/Bit7. |
| VIN (Pin 24) | Main power input | Bypassed with 2.2µF ceramic; supplies charge pump and internal logic; UVLO threshold = 1.5V. |
| DVCC (Pin 10) | Digital I/O supply | Sets logic threshold for SCL/SDA/RST; UVLO threshold = 1V; requires 0.1µF local decoupling. |
| SCL / SDA (Pins 11 / 12) | I²C serial interface | Standard 400kHz-compliant bus; DVCC-referenced; pull-ups required externally; write-only slave. |
| RST (Pin 25) | Asynchronous reset | Active-low; clears all registers and forces shutdown; overrides I²C control during assertion. |
| CPO (Pin 28) | Charge pump output | Supplies all ULED channels; regulated to 1.5×VIN or 2×VIN; requires 4.7µF ceramic to GND. |
| C1P/C1M/C2P/C2M (Pins 27/23/26/22) | Flying capacitor terminals | Connect 2.2µF X5R/X7R ceramics (C1P–C1M, C2P–C2M); slew-limited to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| 18-channel 6-bit linear DAC control | Independent 64-step brightness adjustment per ULED pin - eliminates need for external PWM generators or current-setting resistors. |
| Auto-switching multi-mode charge pump | Dynamic 1x→1.5x→2x transition based on real-time dropout detection - maintains regulation while maximizing efficiency across varying LED VF. |
| GPO mode with strong pull-down option | Configurable ULED pins act as open-drain drivers with <3µA quiescent current in strong pull-down - enables shared use for LED driving and system signaling. |
| Programmable blink & gradation | Per-channel blink periods (1.25s/2.5s) and gradation ramp times (0.24s/0.48s/0.96s) controlled via REG19 - simplifies UI animation without MCU intervention. |
| Thermal & short-circuit protection | Internal overtemperature shutdown and indefinite CPO short-circuit tolerance - ensures robustness in unattended operation. |
Applications
| QVGA+ Video Phone Display | RGB Keypad Backlighting |
|---|---|
|
Use Scenario: Driving 18-channel QVGA+ LCD backlight with mixed white and RGB LEDs for dynamic color balance and local dimming. IC Role / Device Role / Timing Role: Primary LED current controller and charge pump regulator; manages per-pixel brightness via I²C with sub-1ms update latency. Use Value: Enables uniform luminance across 18 segments using only five external ceramics - reduces BOM count and PCB area vs discrete solutions. |
Use Scenario: Illuminating alphanumeric keypad with independent red/green/blue LED control for status indication and user feedback. IC Role / Device Role / Timing Role: Universal current source array with programmable blink/gradation; synchronized via single I²C bus to host microcontroller. Use Value: Delivers precise 20mA per channel with ±1.5% matching - eliminates visible brightness variation between adjacent keys. |
| Industrial HMI Panel Lighting | Portable Medical Device Indicator |
|
Use Scenario: Powering high-reliability indicator LEDs on ruggedized human-machine interface panels operating in extended temperature ranges. IC Role / Device Role / Timing Role: Temperature-hardened LED driver (–40°C to +125°C) with fault-tolerant CPO short-circuit handling. Use Value: Maintains stable 20mA output across full industrial temp range - avoids brightness drift in factory-floor or outdoor deployments. |
Use Scenario: Controlling status LEDs on battery-powered diagnostic tools requiring ultra-low shutdown current and visual alert sequencing. IC Role / Device Role / Timing Role: Low-power LED controller with 3.2µA VIN shutdown current and programmable blink/gradation for alarm states. Use Value: Extends battery life by minimizing quiescent draw while delivering certified medical-grade visual alerts via deterministic timing. |
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, 32mA max per channel; SPI interface; no auto charge pump mode switching. | Higher channel count and current, but lacks adaptive 1.5x/2x mode optimization for variable LED VF stacks. | Prefer for high-current, high-channel-count RGBW panels where SPI bandwidth exceeds I²C needs. |
| MAX20050ATG/V+T | 4-channel, 150mA per channel; integrated boost converter; AEC-Q100 automotive grade. | Designed for automotive interior lighting; includes diagnostics and ASIL-B support - not drop-in for consumer portables. | Choose for automotive cockpit applications requiring functional safety compliance and higher per-channel current. |
Compared with IS31FL3728-QFLS4-TR and MAX20050ATG/V+T, the LTC3220IPF#TRPBF uniquely balances 18-channel flexibility, adaptive charge pump efficiency, and industrial temperature operation in a 4mm × 4mm footprint - making it optimal for compact, thermally constrained portable displays.
Availability
LTC3220IPF#TRPBF is available at Aetrix Electronics and suitable for video phone displays, keypad backlighting, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +125°C performance.
Supply support for LTC3220IPF#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 its legacy of high-performance analog and power management ICs with rigorous qualification standards and long-term product support.
The LTC3220 family was designed specifically for multi-LED portable display systems requiring minimal external components, low EMI, and flexible I²C-based brightness control - targeting QVGA+ handsets, feature phones, and compact industrial interfaces.
FAQ
What is the maximum total current the LTC3220IPF#TRPBF can deliver across all 18 channels?
The LTC3220IPF#TRPBF supports up to 20mA per ULED channel, with a maximum total output current of 360mA (18 × 20mA). This is confirmed in the Absolute Maximum Ratings table and validated by typical performance curves showing stable operation at 360mA CPO load under 1.5x and 2x modes. The LTC3220IPF#TRPBF achieves this with only five external ceramic capacitors and no inductors.
Does the LTC3220IPF#TRPBF support automatic charge pump mode switching, and how does it work?
Yes, the LTC3220IPF#TRPBF automatically switches from 1x → 1.5x → 2x mode based on real-time dropout detection at any enabled ULED pin. Dropout occurs when the voltage across a current source falls below the level needed to sustain its programmed current. The LTC3220IPF#TRPBF remains in each boosted mode until an I²C register update, gradation ramp completion, or blink period end triggers a return to 1x mode.
Can the ULED pins on the LTC3220IPF#TRPBF be used for general-purpose digital outputs?
Yes - each ULED1–ULED18 pin can be configured as an I²C-controlled open-drain general-purpose output (GPO) by setting Bits 6 and 7 high in its corresponding data register (REG1–REG18). In GPO mode, dropout detection is disabled, and the pin supports either strong pull-down (<3µA IQ) or regulated current-sink (up to 20mA) operation - extending utility beyond LED driving.
What is the operating temperature range specified for the LTC3220IPF#TRPBF?
The LTC3220IPF#TRPBF is rated for –40°C to +125°C operation, as confirmed in the "Order Information" table (LTC3220IPF#TRPBF = "I" grade) and Electrical Characteristics notes. This industrial temperature range is fully guaranteed - unlike the "E" grade (–40°C to +85°C) - and applies to all key parameters including LED current matching, charge pump regulation, and I²C timing.
How many external capacitors are required to operate the LTC3220IPF#TRPBF, and what values are specified?
The LTC3220IPF#TRPBF requires exactly five external ceramic capacitors: one 2.2µF (X5R/X7R) on VIN, two 2.2µF flying caps (C1, C2) across C1P–C1M and C2P–C2M, and one 4.7µF (X5R/X7R) on CPO. A 0.1µF capacitor is also required on DVCC. These values are explicitly specified in the Typical Application schematic, Pin Functions section, and Absolute Maximum Ratings footnote.
LTC3220IPF#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-UTQFN (4x4)
LTC3220IPF#TRPBF FAQ
1.How can I place an order for LTC3220IPF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3220IPF#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 LTC3220IPF#TRPBF reliable?
The price and inventory of LTC3220IPF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3220IPF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3220IPF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3220IPF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3220IPF#TRPBF?
LTC3220IPF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3220IPF#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 LTC3220IPF#TRPBF?
For technical support, including LTC3220IPF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3220IPF#TRPBF requirements.
6.How does Aetrix verify that LTC3220IPF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3220IPF#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 LTC3220IPF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3220IPF#TRPBF?
All LTC3220IPF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3220IPF#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 LTC3220IPF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3220IPF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3220IPF#TRPBF 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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