My Inquiry
My Account
Analog Devices Inc. LTC3214EDD#PBF
- Part No.:
- LTC3214EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3214EDD#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:174
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3214EDD#PBF from Analog Devices (formerly Linear Technology) is a low-noise, high-current fractional charge pump LED driver IC designed to deliver up to 500mA regulated current to white LEDs from a 2.9V–4.5V input supply. It integrates automatic 1x/1.5x/2x mode switching, internal 110mΩ current sense, and soft-start circuitry. It serves as the primary LED current source in mobile camera flash/torch circuits.
For engineers reviewing the LTC3214EDD#PBF datasheet, LTC3214EDD#PBF pinout, LTC3214EDD#PBF application, or LTC3214EDD#PBF equivalent, key selection considerations include its 3mm × 3mm 10-lead DFN package, programmable LED current via external RSET, dropout-based multi-mode operation, and absence of inductors in the power path.
Technical Context
The LTC3214EDD#PBF implements a two-phase nonoverlapping oscillator (typ. 900kHz) driving flying capacitors to generate boosted output voltages. Its control loop regulates LED current by sensing voltage at the ILED pin and modulating charge pump strength - not by PWM dimming or external feedback.
Mode transitions (1x → 1.5x → 2x) occur only upon detection of dropout at the ILED pin, with a fixed 2.5ms delay to accommodate LED forward voltage thermal settling. Output disconnect and 43kΩ pull-down during shutdown ensure safe LED biasing when disabled.
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 without pre-regulation |
| Max LED Current | 500mA pulsed - enables high-intensity camera flash; 300mA continuous for torch mode |
| Charge Pump Modes | 1x (direct pass), 1.5x, and 2x - automatically selected to maintain regulation while maximizing efficiency |
| Switching Frequency | Typ. 900kHz - enables use of small 2.2μF ceramic flying capacitors and minimizes EMI filtering needs |
| Current Sense Resistor | Internal 110mΩ - eliminates external sense resistor, reducing BOM count and PCB area |
| LED Current Accuracy | ±5% over temperature - achieved via trimmed 1.21V reference and ratio-metric ISET/ILED transfer function |
| Shutdown Current | ≤7.5μA - preserves battery life during idle periods in portable devices |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11), rated for –40°C to +85°C ambient operation. Exposed pad must be 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 interface | Connect 2.2μF X5R/X7R ceramic capacitors; polarity reversal occurs during operation - polarized caps prohibited |
| CPO (Pin 3) | Charge pump output | Drives LED anode; requires 4.7μF ceramic bypass to GND; clamped at 5V max |
| ILED (Pin 4) | LED cathode current return | Sense node for internal current regulation; connects directly to LED cathode |
| ISET (Pin 5) | Current programming reference | Accepts resistor to GND (RSET = 3570/ILED) to set output current; 1.21V internal reference |
| EN (Pin 6) | Enable/shutdown control | Active-high logic input; internal 250kΩ pull-down; <100μs turn-on delay |
| VIN (Pin 7) | Main power input | 2.9V–4.5V supply; requires 2.2–4.7μF low-ESR ceramic bypass to GND |
| GND (Pin 9) | Signal ground | Dedicated ground return for control circuitry; separate from exposed pad thermal ground |
| Exposed Pad (Pin 11) | Thermal & power ground | Mandatory solder connection to PCB ground plane; primary heat dissipation path |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, EMI filters, and layout-sensitive inductor placement - reduces solution size to <9mm² |
| Automatic mode switching | Transitions between 1x/1.5x/2x based solely on real-time ILED dropout detection - no external control or configuration required |
| Integrated soft-start | Linearly ramps output current over ~150μs - prevents inrush into LED and output capacitor during enable or mode change |
| Open/short LED protection | Disables output if CPO fails to reach >1V (short) or ILED remains open (no load); re-enables after EN toggle |
| Thermal shutdown | Activates at ~165°C junction temperature and auto-recovers at ~150°C - prevents permanent damage under sustained overload |
Applications
| Smartphone Camera Flash | Tablet Torch Lighting |
|---|---|
Use Scenario: High-intensity, short-duration illumination for still image capture in low-light conditions. IC Role / Device Role / Timing Role: Primary current-regulated LED driver delivering 300–500mA pulses synchronized to camera shutter timing. Use Value: Enables consistent flash brightness across varying battery voltage (2.9–4.5V) without requiring DC-DC pre-regulation or external current DACs. |
Use Scenario: Continuous, adjustable-brightness illumination for video recording or ambient lighting in handheld tablets. IC Role / Device Role / Timing Role: Constant-current LED driver operating in 1x or 1.5x mode for stable torch output with minimal thermal rise. Use Value: Delivers up to 300mA continuous current with <5% accuracy and built-in thermal foldback - avoids manual derating or external thermal sensors. |
| Digital Camera Auxiliary Light | Portable Medical Imaging Device |
Use Scenario: Focus assist and preview illumination in compact digital cameras with space-constrained PCBs. IC Role / Device Role / Timing Role: Low-noise, inductorless LED driver powering multiple parallel white LEDs from a single Li-ion cell. Use Value: Achieves >90% efficiency in 1x mode while maintaining <50mV dropout - extends battery runtime without compromising optical performance. |
Use Scenario: Sterile-field-compatible illumination in handheld diagnostic tools requiring reliable, low-EMI LED drive. IC Role / Device Role / Timing Role: Safety-critical LED current source with open/short fault detection and automatic shutdown on abnormal conditions. Use Value: Built-in CPO short-circuit detection and thermal shutdown eliminate need for external monitoring circuitry - simplifies FDA-compliant design validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3215EDD#PBF | Higher 700mA peak current; identical 3mm × 3mm DFN package; 2.9–4.4V input range | Better suited for dual-LED flash arrays requiring >500mA total current | Select when higher peak current is needed without increasing board area |
| LTC3216EDE#PBF | Separate torch/flash current programming; 3mm × 4mm DFN; adds independent EN/CTRL pins | Supports simultaneous dual-current operation (e.g., 100mA torch + 500mA flash) | Choose when independent control of steady-state and pulse modes is required |
Compared with LTC3214EDD#PBF, LTC3215EDD#PBF offers +40% peak current in the same footprint but lacks independent torch/flash control; LTC3216EDE#PBF provides dual-current flexibility at the cost of larger package and added pin count - neither is pin-compatible, but all share identical flying capacitor and layout requirements.
Availability
LTC3214EDD#PBF is available at Aetrix Electronics and suitable for smartphone camera flash modules, tablet torch lighting systems, and portable medical imaging devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3214EDD#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 acquired Linear Technology in 2017 and maintains full product support, datasheet documentation, and technical resources for legacy Linear parts including the LTC3214EDD#PBF.
The LTC3214EDD#PBF belongs to Linear's high-efficiency LED driver product line, engineered specifically for space-constrained, battery-powered imaging applications where inductor-free operation and precise current regulation are critical.
FAQ
What is the maximum continuous LED current supported by the LTC3214EDD#PBF?
The LTC3214EDD#PBF supports up to 300mA continuous LED current. Its 500mA rating applies only to pulsed operation (e.g., camera flash), with duty cycle limitations defined in the datasheet. Continuous operation above 300mA risks thermal shutdown due to power dissipation limits in the 3mm × 3mm DFN package. For sustained 500mA loads, thermal design - including exposed pad soldering and PCB copper area - must be rigorously validated using the θJA = 43°C/W specification.
How does the LTC3214EDD#PBF determine when to switch between 1x, 1.5x, and 2x charge pump modes?
The LTC3214EDD#PBF monitors voltage at the ILED pin to detect dropout conditions. When the voltage drop across the internal 110mΩ sense resistor indicates insufficient headroom for regulation in the current mode, it triggers a transition after a fixed 2.5ms delay. This delay allows the LED's forward voltage to stabilize thermally before committing to a higher-voltage mode. No external signals or configuration registers are involved - mode selection is fully autonomous and analog.
Can the LTC3214EDD#PBF drive multiple LEDs in series?
No, the LTC3214EDD#PBF is designed exclusively for single-string, common-anode LED configurations where the LED anode connects to CPO and the cathode connects to ILED. Its maximum output voltage is limited to ~5V (clamp), and its regulation mechanism relies on sensing current through a single cathode return path. Driving series LEDs would require higher output voltage capability and a different sensing topology - use the LTC3208 or LTC3453 for multi-LED string applications.
What is the recommended value for the RSET resistor to achieve 200mA LED current with the LTC3214EDD#PBF?
Using the datasheet equation RSET = 3570 / ILED, a 200mA target yields RSET = 3570 / 0.2 = 17.85kΩ. A standard 1% tolerance 17.8kΩ resistor meets this requirement with <0.3% error. The ISET pin reference voltage is tightly trimmed to 1.21V ±1%, ensuring accurate current setting across temperature and unit-to-unit variation without calibration.
Does the LTC3214EDD#PBF require external compensation components for stability?
No, the LTC3214EDD#PBF uses an internally compensated control loop. Stability depends entirely on proper selection of external capacitors: CCPO must provide ≥3μF effective capacitance (X5R/X7R ceramic) with ESR <50mΩ, and CVIN should be 2.2–4.7μF low-ESR ceramic. Layout adherence - especially minimizing trace inductance to CPO, VIN, and flying capacitors - is more critical than component selection for avoiding oscillation or ringing.
LTC3214EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3214EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3214EDD#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 LTC3214EDD#PBF reliable?
The price and inventory of LTC3214EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3214EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3214EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3214EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3214EDD#PBF?
LTC3214EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3214EDD#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 LTC3214EDD#PBF?
For technical support, including LTC3214EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3214EDD#PBF requirements.
6.How does Aetrix verify that LTC3214EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3214EDD#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 LTC3214EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3214EDD#PBF?
All LTC3214EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3214EDD#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 LTC3214EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3214EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3214EDD#PBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
