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Analog Devices Inc. LTC3210EPD-1#PBF
- Part No.:
- LTC3210EPD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
LTC3210EPD-1#PBF.pdf
- Description:
- IC LED DRV RGLTR /400MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,580
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Product details
Overview
LTC3210EPD-1#PBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump DC/DC converter IC designed to drive four 25mA MAIN LEDs and one 400mA CAM LED in mobile camera lighting systems. It features automatic 1x/1.5x/2x mode switching, 64-step linear brightness control for MAIN outputs, and operates from 2.9V to 4.5V VBAT with 3µA shutdown current.
For engineers reviewing the LTC3210EPD-1#PBF datasheet, LTC3210EPD-1#PBF pinout, LTC3210EPD-1#PBF application, or LTC3210EPD-1#PBF equivalent, key selection criteria include its dual-current-source architecture (MLED + CLED), resistor-programmable full-scale currents, soft-start behavior, open/short LED protection, and QFN thermal performance under pulsed camera loads.
Technical Context
The LTC3210EPD-1#PBF implements a constant-frequency (800kHz) switched-capacitor charge pump with three operating modes: direct pass-through (1x), 1.5× boost, and 2× boost. Mode transitions are triggered by dropout detection at MLED or CLED pins - when voltage headroom falls below 75mV (MLED) or 500mV (CLED), it escalates to higher gain to maintain regulation.
It integrates two independent digital control paths: a 6-bit down-counter/DAC for MAIN LED current (64 linear steps, 0–20mA with RM = 30.1kΩ), and a 3-bit down-counter/DAC for CAM LED current (8 linear steps, 0–380mA with RC = 24.3kΩ). Both use edge-triggered strobing on ENM/ENC with 150µs settling delay and internal 1.215V reference servoing at RM/RC pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.5V - supports single-cell Li-ion battery operation across full discharge curve. |
| MAIN LED Output Current | Up to 25mA per channel × 4 - low-dropout current sources enable efficient driving of white LEDs with VF ≥ 3.0V. |
| CAM LED Output Current | Up to 400mA - high-current capability meets flash illumination requirements for smartphone/PDA cameras. |
| Brightness Control Resolution | 64-step linear DAC for MAIN, 8-step linear DAC for CAM - enables precise analog-matching dimming without PWM noise. |
| Charge Pump Modes | 1x (VBAT→CPO), 1.5x (4.55V regulated), 2x (5.05V regulated) - auto-switching minimizes power loss while guaranteeing LED bias margin. |
| Shutdown Current | 3µA max - enables ultra-low-power standby in always-on camera modules. |
| Package | 16-lead 3mm × 3mm × 0.75mm UTQFN (exposed pad) - optimized for compact mobile PCBs with thermal vias to ground plane. |
Pinout & Package
Package: 16-lead plastic UTQFN (3mm × 3mm × 0.75mm), exposed thermal pad (Pin 17, GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1P, C2P, C1M, C2M (Pins 1, 16, 14, 13) | Flying capacitor connections | Interface with external 2.2µF ceramic flying caps; high dv/dt nodes requiring tight layout and Faraday shielding. |
| CPO (Pin 2) | Charge pump output rail | Common anode supply for all LEDs; regulated at VBAT (1x), 4.55V (1.5x), or 5.05V (2x); requires 2.2µF X5R/X7R output cap. |
| ENM, ENC (Pins 3, 10) | Digital brightness control inputs | Edge-triggered strobe inputs: ENM controls MAIN current (63 pulses = min), ENC controls CAM current (7 pulses = min); both low >150µs = shutdown. |
| MLED1–MLED4 (Pins 4–7) | MAIN LED cathode current sinks | Four independent 25mA low-dropout current sources; each disables individually by shorting to CPO. |
| CLED (Pin 11) | CAM LED cathode current sink | Single 400mA high-current sink; shares CPO anode but uses separate 3-bit DAC and RC programming resistor. |
| RM, RC (Pins 8, 9) | Current set reference pins | Servo to 1.215V; resistors to GND set full-scale MLED/CLED currents via IFS = (1.215V/(R + 500Ω)) × gain factor. |
| GND (Pin 12) | Power and signal ground | Low-impedance return path; must connect exposed pad and all bypass caps directly to solid ground plane. |
| VBAT (Pin 15) | Main input supply | Accepts 2.9–4.5V; requires ≥2.2µF low-ESR ceramic bypass cap close to pin; 10nH series trace reduces input ripple. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI and board area for inductors; relies on ceramic flying/output caps for charge transfer and filtering. |
| Automatic mode switching | Real-time dropout detection triggers seamless 1x → 1.5x → 2x transitions without software intervention or external control logic. |
| Independent MAIN/CAM current programming | Separate RM/RC resistors and ENM/ENC control paths allow simultaneous but distinct brightness tuning for display backlight and flash functions. |
| Open/short LED fault protection | Internal comparators detect open-circuit (4–16µA test current) and short-circuit (0.4–1.3V threshold) conditions on CPO and shut down affected outputs. |
| Thermal shutdown | Activates at ~150°C die temperature; disables all current sources and charge pump until die cools by ~15°C - prevents permanent damage during sustained flash operation. |
Applications
| Smartphone Camera Flash | Tablet Main Display Backlight |
|---|---|
Use Scenario: High-intensity, short-duration illumination for rear-facing camera capture in low-light environments. IC Role / Device Role / Timing Role: CAM LED current source delivering up to 400mA peak current with 8-step linear dimming via ENC strobes. Use Value: Enables consistent flash intensity across battery voltage range (2.9–4.5V) using auto-boost modes, eliminating need for discrete boost converters. |
Use Scenario: Uniform, flicker-free backlighting for 4–6 inch LCD displays in portable computing devices. IC Role / Device Role / Timing Role: Four-channel MAIN LED driver with 64-step linear brightness control synchronized to system UI dimming commands. Use Value: Provides smooth, analog-equivalent dimming without PWM-induced EMI or audible noise - critical for audio-sensitive tablet designs. |
| PDA Front-Facing Video Light | Ultra-Compact DSC Auxiliary Illumination |
Use Scenario: Low-power, always-available fill light for video conferencing in handheld PDAs. IC Role / Device Role / Timing Role: Dual-role controller managing both MAIN (UI backlight) and CAM (front camera assist) LEDs from shared VBAT rail. Use Value: Reduces BOM count by integrating two independent LED drivers with shared charge pump and protection circuitry in 3mm × 3mm footprint. |
Use Scenario: Space-constrained digital still cameras requiring minimal component count for auxiliary focus assist or macro lighting. IC Role / Device Role / Timing Role: Compact, capacitor-based LED power solution replacing inductor-based boost ICs and discrete current regulators. Use Value: Achieves <12mm² total solution size (IC + 4×2.2µF caps + 2 resistors) - fits within narrow camera module bezels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Inductor-based 28V boost converter; 30mA per channel × 4; no CAM-dedicated output; I²C interface instead of EN strobe. | Requires external inductor and compensation; better suited for high-VF LED strings (>4V) than low-VF mobile LEDs. | Choose TPS61165DRVR only if system already uses inductor-based power architecture and needs I²C configurability over strobe simplicity. |
| MAX16823ATI+T | High-side current regulator; supports up to 1.5A total; requires external MOSFET and sense resistor; no integrated charge pump. | Designed for automotive and industrial LED arrays; lacks integrated brightness DAC and auto-mode switching logic. | Choose MAX16823ATI+T for high-power, thermally robust applications where external FET control and wide input range (4.5–28V) outweigh integration benefits. |
Compared with TPS61165DRVR and MAX16823ATI+T, the LTC3210EPD-1#PBF delivers superior integration for space-limited mobile camera modules - combining charge pump, dual-current-sink topology, and strobe-based dimming in a single UTQFN package without inductors or communication interfaces.
Availability
LTC3210EPD-1#PBF is available at Aetrix Electronics and suitable for smartphone camera flash, tablet display backlight, PDA video assist, and compact DSC illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3210EPD-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 precision instrumentation, communications, and industrial markets.
The LTC3210EPD-1#PBF belongs to Linear's legacy LED driver product line, specifically engineered for low-noise, inductorless camera lighting in battery-powered portable electronics - emphasizing efficiency across varying input voltage and minimal EMI in RF-sensitive layouts.
FAQ
What is the maximum total output current supported by the LTC3210EPD-1#PBF?
The LTC3210EPD-1#PBF supports up to 4 × 25mA = 100mA on the MAIN outputs and up to 400mA on the CAM output, for a total of 500mA. However, continuous operation above 300mA is limited by thermal constraints and duty cycle; the datasheet specifies 300mA as the maximum continuous current under absolute maximum conditions.
How does the LTC3210EPD-1#PBF handle LED open-circuit faults?
The LTC3210EPD-1#PBF detects open-circuit conditions on MLED pins by sourcing 4–16µA test current and measuring voltage drop; if VCPO – VMLED exceeds 0.5–1.5V, it flags an open fault. For CPO, it monitors short-circuit threshold (0.4–1.3V) and disables outputs to prevent damage - all without external circuitry.
Can the LTC3210EPD-1#PBF drive LEDs with forward voltages exceeding 4.5V?
Yes - the LTC3210EPD-1#PBF's 2x charge pump mode regulates CPO at 5.05V, enabling reliable operation with LEDs having VF up to ~4.5V (accounting for 500mV dropout on CLED). In 1.5x mode, CPO is regulated at 4.55V, supporting LEDs up to ~3.8V with margin.
What is the purpose of the exposed thermal pad on the LTC3210EPD-1#PBF UTQFN package?
The exposed pad (Pin 17) on the LTC3210EPD-1#PBF is electrically and thermally connected to GND. It must be soldered to a large PCB copper area with multiple thermal vias to a solid ground plane - this reduces θJA from 68°C/W to ~40°C/W and prevents thermal shutdown during 400mA CAM LED pulses.
Is the LTC3210EPD-1#PBF pin-compatible with the LTC3210EUD-1#PBF?
No - the LTC3210EPD-1#PBF uses a 16-lead UTQFN package (LCXT marking), while the LTC3210EUD-1#PBF uses a 16-lead QFN (LCBT marking). Although both have identical pin counts and functions, their land patterns differ: UTQFN has smaller pitch and requires tighter solder mask definition. PCB redesign is required for substitution.
LTC3210EPD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-UFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA, 400mA
- Frequency:
- 800kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3210EPD-1#PBF FAQ
1.How can I place an order for LTC3210EPD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3210EPD-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 LTC3210EPD-1#PBF reliable?
The price and inventory of LTC3210EPD-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 LTC3210EPD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3210EPD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3210EPD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3210EPD-1#PBF?
LTC3210EPD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3210EPD-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 LTC3210EPD-1#PBF?
For technical support, including LTC3210EPD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3210EPD-1#PBF requirements.
6.How does Aetrix verify that LTC3210EPD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3210EPD-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 LTC3210EPD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3210EPD-1#PBF?
All LTC3210EPD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3210EPD-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 LTC3210EPD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3210EPD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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