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Analog Devices Inc. LTC3230EUD#PBF
- Part No.:
- LTC3230EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3230EUD#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 25MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:242
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Product details
Overview
LTC3230EUD#PBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump DC/DC converter with integrated dual 200mA LDOs and five LED current sources - four 25mA main (MLED1–4) and one 25mA sub (SLED) - designed for backlight and display power in portable consumer electronics. It operates from 2.7V to 5.5V input, delivers up to 125mA total LED current, features automatic 1x/1.5x/2x mode switching, and uses only four 1μF ceramic capacitors and one RSET resistor.
For engineers reviewing the LTC3230EUD#PBF datasheet, LTC3230EUD#PBF pinout, LTC3230EUD#PBF application, or LTC3230EUD#PBF equivalent, key selection considerations include its 20-lead 3mm × 3mm QFN package, single-wire brightness control via ENM/ENS strobing, 32:1 linear DAC dimming, open/short LED protection, and independent LDO voltage selection (1.2/1.5/1.8V for LDO1; 1.8/2.8/3.3V for LDO2).
Technical Context
The LTC3230EUD#PBF implements a constant-frequency 900kHz switched-capacitor charge pump with automatic mode transition: it powers up in 1x mode (VIN → CPO), switches to 1.5x mode (target VCPO = 4.5V) upon LED dropout detection, then to 2x mode (target VCPO = 5.0V) if further dropout occurs. Mode switching delay is 0.5ms, and soft-start limits inrush during startup and mode changes.
LED current is set by an external RSET resistor (VRSET = 768–832mV, IRSET = 70μA typical) and digitally trimmed via 5-bit linear DACs controlled by ENM (MLED1–4) and ENS (SLED) strobe pulses - each pulse decrements output from full scale (e.g., 25.5mA) down to 1 LSB (0.860mA). The two LDOs operate independently, with tri-level V1/V2 pins selecting output voltages and shutdown current as low as 3μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - supports single-cell Li-ion and Li-poly battery operation without external regulation. |
| Total LED Current | Up to 125mA - enables simultaneous drive of 4×25mA main LEDs + 1×25mA sub LED for dual-display systems. |
| Charge Pump Modes | 1x / 1.5x / 2x - auto-switching based on LED dropout; 1.5x mode delivers 4.5V, 2x mode delivers 5.0V at CPO. |
| LDO Output Options | LDO1: 1.2V/1.5V/1.8V; LDO2: 1.8V/2.8V/3.3V - selectable via tri-level V1/V2 pins, enabling flexible system rail generation. |
| Brightness Control | 32:1 linear dimming - achieved via 5-bit DAC strobing on ENM/ENS, supporting precise analog-like intensity adjustment. |
| Shutdown Current | 3μA max - ensures ultra-low quiescent draw when both ENM and ENS are held low ≥250μs. |
| Package | 20-lead 3mm × 3mm QFN, 0.75mm profile - compact footprint with exposed pad for thermal management and grounding. |
Pinout & Package
Package: 20-lead (3mm × 3mm) plastic QFN with exposed ground pad (Pin 21), 0.75mm height. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPO (1) | Charge pump output | Supplies all LED anodes; regulated at 1x (VIN), 1.5x (4.5V), or 2x (5.0V); requires 1μF ceramic to GND. |
| ENLDO1 (2), ENLDO2 (3) | LDO enable inputs | Logic-high enables respective LDO; independent control allows selective powering of system rails. |
| RSET (4) | LED current reference | Serves 0.8V internal reference; sets full-scale MLED/SLED current (e.g., 17.4kΩ → 25.5mA). |
| ENS (5), ENM (11) | Sub/Main LED control | Strobe inputs for 5-bit DAC dimming; each pulse decrements current; hold low ≥250μs enters shutdown. |
| SLED (6), MLED1–4 (7–10) | LED cathode current sinks | Low-dropout current sources; SLED drives sub-display, MLED1–4 drive main display LEDs. |
| V1 (12), V2 (13) | LDO voltage select | Tie to GND/FLOAT/VIN to set LDO1 (1.2/1.5/1.8V) and LDO2 (1.8/2.8/3.3V) outputs. |
| LDO1 (14), LDO2 (15) | LDO regulated outputs | Each delivers up to 200mA; bypassed with 1μF ceramic to GND; dropout ≤250mV at full load. |
| C1P/C1M/C2P/C2M (16,17,19,20) | Flying capacitor terminals | Connect two 1μF ceramic caps (C1, C2) in flying-capacitor topology; polarity-insensitive, must be ceramic. |
| VIN (18) | Main supply input | 2.7V–5.5V input; bypass with ≥2.2μF low-ESR ceramic capacitor to suppress high-frequency noise. |
| GND (21, Exposed Pad) | Power and signal ground | Exposed thermal pad is electrically GND; must be soldered to large PCB ground plane for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and EMI concerns; uses only ceramic capacitors for compact, low-profile design. |
| Automatic mode switching | Transitions from 1x → 1.5x → 2x based on real-time LED dropout detection, maximizing efficiency across input/LED VF range. |
| Dual independent LDOs | Each supplies up to 200mA with selectable output voltage and independent enable, enabling flexible power tree partitioning. |
| Single-wire digital dimming | ENM/ENS strobe interface provides 32 linear steps without PWM or external DAC, reducing component count and layout complexity. |
| Integrated protection | Includes open/short LED detection, thermal shutdown, and overcurrent limiting - no external fault monitoring required. |
| Low-noise constant-frequency operation | 900kHz fixed-frequency switching minimizes audible noise and simplifies EMI filtering vs variable-frequency alternatives. |
Applications
| Cell Phone Main/Sub Display | Digital Camera Backlight |
|---|---|
|
Use Scenario: Dual-panel smartphone with primary LCD and secondary status OLED. IC Role / Device Role / Timing Role: LTC3230EUD#PBF drives 4 main LEDs for primary display and 1 sub LED for secondary panel, while powering camera ISP core (via LDO1) and sensor interface (via LDO2). Use Value: Single-chip solution eliminates need for separate LED driver and dual-LDO ICs, reducing BOM count and PCB area by >30%. |
Use Scenario: High-resolution digital camera with bright white LED flash and image sensor bias rails. IC Role / Device Role / Timing Role: LTC3230EUD#PBF supplies 125mA LED current for flash illumination and generates stable 2.8V (LDO2) for CMOS sensor and 1.5V (LDO1) for digital core. Use Value: Integrated charge pump + LDOs deliver flash-ready LED current within 250μs of enable, with <100mV dropout ensuring consistent sensor bias under load. |
| PDA System Power Management | Portable Navigation Device (PND) |
|
Use Scenario: Legacy PDA requiring simultaneous backlight, touchscreen controller, and memory interface power. IC Role / Device Role / Timing Role: LTC3230EUD#PBF powers 4×25mA main display LEDs and provides 1.8V (LDO1) for NAND flash and 3.3V (LDO2) for touch controller ASIC. Use Value: Tri-level LDO selection matches exact voltage requirements of legacy peripherals, avoiding inefficient linear regulators or discrete LDOs. |
Use Scenario: Automotive-grade PND with sunlight-readable display and GPS baseband processor. IC Role / Device Role / Timing Role: LTC3230EUD#PBF drives high-brightness main display LEDs and supplies 1.2V (LDO1) to GPS RF front-end and 2.8V (LDO2) to baseband SoC I/O. Use Value: 32:1 linear dimming enables seamless brightness adaptation from indoor to direct sunlight, maintaining display readability without PWM flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver and dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1698ETD+T | Single-output boost LED driver (no LDOs); 36V max input; requires external current sense resistor and compensation network. | Only drives LEDs - cannot replace LTC3230EUD#PBF's dual-LDO functionality; suitable only when system has separate LDOs. | Select when LED current >125mA is needed or higher input voltage (>5.5V) is required; not a functional substitute for integrated LDO capability. |
| TPS61165DRVR | Single-output boost LED driver with I²C interface; no integrated LDOs; supports up to 40mA per channel (max 160mA total) but lacks sub-display channel. | Requires external LDOs and I²C host control; no native single-wire dimming or dual-display segmentation. | Choose for designs needing programmable fault reporting or I²C-based dynamic brightness updates; not drop-in for LTC3230EUD#PBF's analog-dimming simplicity. |
Compared with MAX1698ETD+T and TPS61165DRVR, the LTC3230EUD#PBF uniquely integrates five independent LED current sources with dual programmable LDOs in a single 3mm × 3mm QFN, eliminating external regulators and simplifying dual-display power architecture - a capability neither alternative provides.
Availability
LTC3230EUD#PBF is available at Aetrix Electronics and suitable for cell phone display, digital camera backlight, and portable navigation device applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3230EUD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3230EUD#PBF belongs to ADI's precision power management portfolio, engineered specifically for space-constrained portable electronics requiring integrated LED backlighting and auxiliary system rail generation without inductors.
FAQ
What is the maximum total LED current supported by the LTC3230EUD#PBF?
The LTC3230EUD#PBF supports up to 125mA total LED current - composed of four 25mA main LED current sources (MLED1–4) and one 25mA sub LED current source (SLED). This is confirmed in the "Features" section and Electrical Characteristics table, where full-scale MLED/SLED current is specified as 25.5mA (typical) at RSET = 17.4kΩ, and the "Up to 125mA Total LED Current" feature is explicitly listed.
How does brightness control work on the LTC3230EUD#PBF?
The LTC3230EUD#PBF implements 32:1 linear LED brightness control using 5-bit DACs driven by strobe pulses on ENM (for MLED1–4) and ENS (for SLED). Each positive pulse decrements the DAC value; 0 pulses = full scale (e.g., 25.5mA), 31 pulses = minimum (0.860mA). The LTC3230EUD#PBF datasheet specifies this timing in Figure 1 and the "PIN FUNCTIONS" section, with 150μs delay before output update.
What are the LDO output voltage options for the LTC3230EUD#PBF?
The LTC3230EUD#PBF provides three selectable output voltages per LDO: LDO1 (pins V1/LDO1) offers 1.2V, 1.5V, or 1.8V; LDO2 (pins V2/LDO2) offers 1.8V, 2.8V, or 3.3V. These are set by tying V1/V2 to GND, floating, or VIN - as defined in Table 2 ("LDO1 and LDO2 Output Voltage Control") and verified in the "PIN FUNCTIONS" description on page 7 of the datasheet.
Does the LTC3230EUD#PBF require inductors in its circuit?
No, the LTC3230EUD#PBF uses a switched-capacitor charge pump architecture and requires no inductors. It operates with only four 1μF ceramic capacitors (C1, C2, C4, C5), one 2.2μF input capacitor (C3), and one RSET resistor - as stated in the "DESCRIPTION" section and confirmed in the Typical Application schematic (TA01a). The "No Inductors" feature is explicitly called out in the datasheet's FEATURES list.
What protection features are built into the LTC3230EUD#PBF?
The LTC3230EUD#PBF includes open/short LED detection, thermal shutdown, overcurrent limiting on LDO outputs (280–750mA), and internal soft-start to limit inrush current during startup and mode transitions. These protections are documented in the "FEATURES" list ("Open/Short LED Protection"), Electrical Characteristics table (LDO current limit), and "OPERATION" section (soft-start timing and thermal protection notes).
LTC3230EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- 900kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
LTC3230EUD#PBF FAQ
1.How can I place an order for LTC3230EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3230EUD#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 LTC3230EUD#PBF reliable?
The price and inventory of LTC3230EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3230EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3230EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3230EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3230EUD#PBF?
LTC3230EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3230EUD#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 LTC3230EUD#PBF?
For technical support, including LTC3230EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3230EUD#PBF requirements.
6.How does Aetrix verify that LTC3230EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3230EUD#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 LTC3230EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3230EUD#PBF?
All LTC3230EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3230EUD#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 LTC3230EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3230EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3230EUD#PBF 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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