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Analog Devices Inc. LTC3214EDD#TRPBF
- Part No.:
- LTC3214EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3214EDD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
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Product details
Overview
LTC3214EDD#TRPBF from Analog Devices (formerly Linear Technology) is a high-current, low-noise fractional charge pump LED driver IC designed for camera flash/torch applications in portable devices. It delivers up to 500mA regulated LED current from a 2.9V–4.5V input, operates in automatic 1x/1.5x/2x boost modes, features internal 110mΩ current sensing, and uses only two flying capacitors and one programming resistor. It is deployed in smartphone camera modules requiring compact, inductorless, high-efficiency lighting.
For engineers reviewing the LTC3214EDD#TRPBF datasheet, LTC3214EDD#TRPBF pinout, LTC3214EDD#TRPBF application, or LTC3214EDD#TRPBF equivalent, key selection considerations include its 3mm × 3mm 10-lead DFN package, programmable LED current via ISET resistor, automatic mode switching based on dropout detection, open/short LED protection, and thermal shutdown at ~165°C - all critical for battery-powered imaging systems with strict EMI and layout constraints.
Technical Context
The LTC3214EDD#TRPBF implements a 2-phase nonoverlapping oscillator (~900kHz typical) driving a switched-capacitor charge pump with three discrete gain modes: direct pass-through (1x), fractional 1.5x, and 2x voltage multiplication. Mode transitions are triggered by real-time monitoring of the voltage drop across the internal 110mΩ sense resistor at the ILED pin, enabling dynamic efficiency optimization without external control logic.
Current regulation is achieved through an internal programmable current source referenced to a stable 1.21V bandgap at the ISET pin; LED current is set by RSET = 3570 / ILED (e.g., 7.14kΩ for 500mA). The device integrates soft-start (150μs ramp), output disconnect in shutdown, and CPO short-circuit detection with 0.5–1.5V threshold and 12–66mA test current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.5V - supports single-cell Li-ion/Li-poly battery operation with headroom for discharge curve. |
| Max LED Current | 500mA pulsed (300mA continuous) - enables high-intensity flash while managing thermal limits in compact DFN package. |
| Charge Pump Modes | 1x / 1.5x / 2x - automatically selected to minimize power loss; 1x mode provides lowest noise and highest efficiency when VF ≤ VIN. |
| Oscillator Frequency | 0.6–1.2MHz (typ 0.9MHz) - enables use of small 2.2μF ceramic flying capacitors and reduces EMI compared to lower-frequency inductive solutions. |
| LED Current Sense | Internal 110mΩ resistor - eliminates external sense resistor, reduces BOM count, and improves accuracy over temperature. |
| Shutdown Current | 2.5–7.5μA - preserves battery life during idle periods in always-on camera subsystems. |
| Package | 10-lead 3mm × 3mm DFN with exposed pad - provides low thermal resistance (θJA = 43°C/W) and compact footprint for space-constrained mobile PCBs. |
Pinout & Package
Package: 10-lead plastic DFN (3mm × 3mm), exposed pad (Pin 11) soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+, C1−, C2+, C2− (Pins 1, 2, 8, 10) | Flying capacitor interfaces | Connect 2.2μF X5R/X7R ceramic capacitors; bidirectional high-dv/dt nodes requiring tight layout to minimize EMI coupling. |
| CPO (Pin 3) | Charge pump output | Drives LED anode; requires 4.7μF ceramic bypass to GND; clamped to 5V max; short-circuit protected. |
| ILED (Pin 4) | LED cathode current return | Connects LED cathode; internal 110mΩ sense path feeds regulation loop; detects open/short LED faults. |
| ISET (Pin 5) | Current programming reference | 1.21V ±30mV reference; sets LED current via external RSET; 184μA input bias current affects precision at high resistance values. |
| EN (Pin 6) | Enable/shutdown control | Active-high logic input (VIH ≥1.4V); internal 250kΩ pull-down; controls soft-start initiation and output disconnect. |
| VIN (Pin 7) | Main power input | 2.9–4.5V supply; requires 2.2–4.7μF low-ESR ceramic bypass close to pin to suppress high-frequency switching noise. |
| GND (Pin 9) | Signal and charge pump ground | Low-impedance connection to PCB ground plane; separate from exposed pad but electrically tied internally. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Mandatory solder connection to large copper pour; primary heat dissipation path; reduces θJA and improves stability. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic multi-mode switching | Transitions between 1x→1.5x→2x based on real-time ILED dropout detection, eliminating need for external mode control and maximizing efficiency across varying LED VF. |
| No-inductor architecture | Uses only ceramic capacitors (no magnetics), reducing EMI, board area, and cost - critical for thin mobile form factors where inductors cause height and placement conflicts. |
| Integrated 110mΩ current sense | Enables accurate, temperature-stable LED current regulation without external sense resistor, improving layout simplicity and reducing power loss in sensing path. |
| Open/short LED protection | Detects fault conditions via ILED pin voltage monitoring and disables output, preventing damage to IC or LED string during assembly or field operation. |
| Thermal shutdown | Activates at ~165°C junction temperature and auto-recovers at ~150°C, allowing safe operation under transient overload without latch-up or permanent failure. |
Applications
| Smartphone Camera Flash | Tablet Torch Lighting |
|---|---|
Use Scenario: High-intensity, short-duration illumination for still image capture in low-light environments. IC Role / Device Role / Timing Role: Constant-current LED driver with programmable 500mA flash current, controlled by baseband processor EN signal with <100μs turn-on delay. Use Value: Enables bright, consistent flash output using only ceramic capacitors - avoids inductor height constraints and meets stringent RF coexistence requirements in antenna-proximate layouts. |
Use Scenario: Continuous, medium-brightness illumination for video recording or ambient lighting in handheld tablets. IC Role / Device Role / Timing Role: Regulated 200–300mA torch-mode LED driver with automatic 1x/1.5x mode selection to maintain efficiency as battery voltage drops from 4.2V to 3.3V. Use Value: Delivers stable light output over full battery range without firmware intervention, leveraging built-in soft-start and thermal protection for reliable long-duration operation. |
| Digital Camera Auxiliary Light | Portable Medical Imaging Device |
Use Scenario: Focus assist and preview illumination in compact digital cameras with dual-LED arrays. IC Role / Device Role / Timing Role: Dual-channel capable driver (via parallel configuration) delivering matched 250mA per channel with independent EN control for staggered timing. Use Value: Supports precise white balance calibration by ensuring identical current drive and thermal behavior across multiple LEDs, minimizing color shift. |
Use Scenario: Sterile-field-compatible illumination in handheld dermatoscopes or otoscopes requiring low EMI and no magnetic components. IC Role / Device Role / Timing Role: Low-noise, inductorless LED driver powering high-CRI LEDs for accurate tissue color rendering under battery power. Use Value: Meets IEC 60601-1 EMI limits without shielding, thanks to constant-frequency operation and absence of radiating inductors - simplifying medical certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED charge pump driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3215 | Higher 700mA peak current; wider 2.9–4.4V input; 3mm × 3mm DFN same footprint; higher quiescent current (300μA vs 6.7mA in 2x mode). | Better suited for higher-power flash requiring >500mA; same PCB layout possible but requires revalidation of thermal performance at elevated current. | Select LTC3215 if system requires >500mA flash current and can accommodate slightly higher static power draw. |
| LTC3206 | Lower 400mA max current; 800kHz oscillator; optimized for multi-display backlight (not flash); different pinout (12-lead DFN); no 2x mode. | Designed for continuous backlighting with PWM dimming support; lacks flash-specific protections (e.g., no open/short LED detection). | Choose LTC3206 only for always-on display lighting applications - not recommended as functional replacement for flash/torch use cases. |
Compared with LTC3214EDD#TRPBF, LTC3215 offers higher current headroom in the same package but trades off higher operating current, while LTC3206 targets fundamentally different (continuous backlight) applications and lacks critical flash-mode features like automatic mode switching and robust fault protection - making LTC3214EDD#TRPBF the optimal choice for compact, high-reliability camera lighting.
Availability
LTC3214EDD#TRPBF is available at Aetrix Electronics and suitable for smartphone camera modules, portable medical imaging devices, and tablet torch lighting requiring stable component supply, RoHS-compliant lead-free packaging, and long-term production continuity.
Supply support for LTC3214EDD#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 high-performance analog/mixed-signal product lines, including precision power management ICs for demanding portable applications.
The LTC3214EDD#TRPBF belongs to Linear's LED charge pump driver family, engineered specifically for inductorless, low-EMI, high-current lighting in space- and noise-constrained mobile electronics - emphasizing integration, thermal robustness, and autonomous efficiency optimization.
FAQ
What is the maximum continuous LED current supported by the LTC3214EDD#TRPBF?
The LTC3214EDD#TRPBF supports up to 300mA continuous LED current. Its 500mA rating applies to pulsed operation (e.g., camera flash), where duty cycle and thermal management allow brief high-current bursts. Continuous operation above 300mA risks exceeding the 125°C maximum junction temperature, triggering thermal shutdown. Designers must verify PCB copper area and airflow per the datasheet's thermal guidelines when operating near this limit.
How does the LTC3214EDD#TRPBF achieve automatic mode switching between 1x, 1.5x, and 2x charge pump operation?
The LTC3214EDD#TRPBF monitors the voltage drop across its internal 110mΩ sense resistor at the ILED pin. When this dropout voltage exceeds ~40mV (indicating insufficient headroom in the current mode), the device waits ~2.5ms-allowing LED warm-up and VF reduction-then transitions to the next higher gain mode. This closed-loop, hardware-based switching requires no external control signals and ensures optimal efficiency across varying input voltage and LED forward voltage conditions.
Can the LTC3214EDD#TRPBF drive multiple LEDs in series or parallel?
The LTC3214EDD#TRPBF is designed for single-string LED operation with the LED anode connected to CPO and cathode to ILED. Driving multiple LEDs in series exceeds its maximum CPO output voltage (5V clamp), while parallel strings cause current mismatch due to VF variations. For multi-LED arrays, use separate LTC3214EDD#TRPBF units per string or select a multi-channel driver like LTC3208. Layout symmetry and thermal coupling must be carefully managed in parallel configurations.
What capacitor types and values are mandatory for stable operation of the LTC3214EDD#TRPBF?
The LTC3214EDD#TRPBF requires X5R or X7R ceramic capacitors: 2.2μF for C1/C2 (flying), 2.2–4.7μF for CIN (input), and 4.7μF for CCPO (output). Polarized capacitors (tantalum/aluminum) are strictly prohibited for flying caps due to reverse voltage risk. Output capacitance must maintain ≥3μF effective value over temperature/voltage; ESR must stay below 50mΩ to ensure loop stability and low ripple. MLCCs meeting these specs are mandatory - not optional.
Does the LTC3214EDD#TRPBF provide protection against LED open-circuit or short-circuit faults?
Yes, the LTC3214EDD#TRPBF includes both open-LED and shorted-LED protection. An open LED causes the ILED pin voltage to rise above the regulation threshold, triggering shutdown. A shorted LED pulls CPO below 1V during startup or operation, disabling the charge pump. These protections are implemented in hardware and do not require external circuitry. Fault recovery is automatic upon removal of the fault condition and re-enabling via the EN pin.
LTC3214EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 500mA
- Frequency:
- 900kHz
- Dimming:
- -
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3214EDD#TRPBF FAQ
1.How can I place an order for LTC3214EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3214EDD#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 LTC3214EDD#TRPBF reliable?
The price and inventory of LTC3214EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3214EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3214EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3214EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3214EDD#TRPBF?
LTC3214EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3214EDD#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 LTC3214EDD#TRPBF?
For technical support, including LTC3214EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3214EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3214EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3214EDD#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 LTC3214EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3214EDD#TRPBF?
All LTC3214EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3214EDD#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 LTC3214EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3214EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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