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Analog Devices Inc. LTC3215EDD#PBF
- Part No.:
- LTC3215EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3215EDD#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 700MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:515
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Product details
Overview
LTC3215EDD#PBF from Analog Devices (formerly Linear Technology) is a low-noise, high-current charge pump LED driver IC designed for camera flash and torch applications in portable devices. It delivers up to 700mA LED current with programmable accuracy (±4%), operates from 2.9V–4.4V input, supports automatic 1x/1.5x/2x mode switching, and features ultralow dropout current regulation - enabling stable drive of white LEDs even at low forward voltages in smartphones and digital cameras.
For engineers reviewing the LTC3215EDD#PBF datasheet, LTC3215EDD#PBF pinout, LTC3215EDD#PBF application, or LTC3215EDD#PBF equivalent, key selection criteria include its 10-lead DFN package thermal performance, ILED current programming via external resistor (RSET), CPO output impedance in each boost mode, open/short LED protection behavior, and shutdown current (2.5µA typical).
Technical Context
The LTC3215EDD#PBF implements a fractional switched-capacitor charge pump with nonoverlapping 900kHz oscillator driving four flying capacitor switches (C1+, C1−, C2+, C2−). Its control loop regulates CPO voltage to 4.6V (1.5x) or 5.1V (2x) while maintaining constant ILED via an internal current source servoing ISET to 1.22V.
Mode switching is triggered by ILED dropout detection (120mV threshold), with ~2.5ms warm-up delay before transition; soft-start limits inrush during startup and mode changes. Thermal shutdown activates at ~150°C junction temperature and recovers at ~135°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.4V - compatible with single-cell Li-ion/Li-poly battery systems without pre-regulation. |
| Max Continuous LED Current | 350mA - sustained operation limit defined by thermal design and duty cycle constraints. |
| Peak LED Current | 700mA - supported for pulsed flash operation with proper EN toggling and board thermal management. |
| LED Current Accuracy | ±4% - ensures consistent brightness across units and temperature (–40°C to 85°C). |
| Shutdown Current | 2.5µA typical - minimizes battery drain during device standby. |
| Oscillator Frequency | 0.9MHz typical - enables use of small 2.2µF ceramic flying capacitors and reduces EMI susceptibility. |
| CPO Output Impedance (1.5x) | 1.5Ω at VIN = 3.4V - determines voltage droop under dynamic load steps; impacts flash consistency. |
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− (Pin 10) | Flying capacitor negative terminal | Connects to negative side of C1; bidirectional high-dv/dt node requiring short, low-inductance layout. |
| GND (Pin 9) | Charge pump ground reference | Primary ground return for flying capacitor switching; must connect directly to low-impedance ground plane. |
| C2− (Pin 8) | Flying capacitor negative terminal | Connects to negative side of C2; shares switching waveform characteristics with C1−. |
| VIN (Pin 7) | Main power input | Supplies all internal circuitry and flying capacitor charging path; requires ≥2.2µF low-ESR ceramic bypass. |
| EN (Pin 6) | Enable/shutdown control input | CMOS-compatible logic input; drives part into ultra-low-power shutdown (2.5µA) when pulled low. |
| C2+ (Pin 5) | Flying capacitor positive terminal | Connects to positive side of C2; high-frequency switching node sensitive to parasitic capacitance. |
| C1+ (Pin 4) | Flying capacitor positive terminal | Connects to positive side of C1; paired with C1− to form first flying capacitor path. |
| CPO (Pin 3) | Charge pump regulated output | Delivers boosted voltage (VIN, 4.6V, or 5.1V) to LED anode; requires 4.7µF X5R/X7R ceramic capacitor to GND. |
| ILED (Pin 2) | LED current sink output | Sinks programmed current from LED cathode; connects directly to LED cathode; disconnects from VIN in shutdown. |
| ISET (Pin 1) | Current programming reference | Servos to 1.22V; RSET from this pin to GND sets ILED per RSET = 3990/ILED (Ω/mA). |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI and board space for inductors; enables <1mm profile designs using only ceramic capacitors. |
| Automatic mode switching | Transitions between 1x (direct VIN pass), 1.5x, and 2x charge pump modes based on real-time ILED dropout detection - maximizing efficiency across varying LED VF. |
| Ultralow dropout current regulation | Maintains ±4% ILED accuracy down to 120mV headroom - critical for driving low-VF LEDs or maintaining brightness as battery voltage declines. |
| Open/short LED fault protection | Detects open-circuit (CPO >1.5V) and short-circuit (CPO <0.5V) conditions, disabling output to prevent damage or excessive power dissipation. |
| Integrated soft-start | Linearly ramps output current over ~250µs at startup and mode transitions - preventing mechanical vibration in camera modules and reducing input supply stress. |
Applications
| Smartphone Camera Flash | Digital Camera Torch Mode |
|---|---|
Use Scenario: High-intensity, brief-duration illumination for still image capture in low-light conditions. IC Role / Device Role / Timing Role: Charge pump LED driver providing 500–700mA pulsed current to single high-brightness white LED with precise timing control via EN pin. Use Value: Delivers >90% efficiency in 1x mode at full battery voltage, extends flash duration per charge, and avoids audible coil whine due to 900kHz fixed-frequency operation. |
Use Scenario: Steady, medium-brightness illumination for video recording or UI backlighting in handheld imaging devices. IC Role / Device Role / Timing Role: Constant-current LED driver operating in 1x or 1.5x mode to maintain consistent luminance across battery discharge (2.9V–4.4V). Use Value: Ultralow dropout regulation ensures stable 200–350mA output even at end-of-discharge, eliminating brightness sag during extended torch use. |
| PDAs with Integrated Imaging | Portable Medical Endoscope Lighting |
Use Scenario: Compact, low-profile illumination for barcode scanning or document capture in legacy PDA platforms. IC Role / Device Role / Timing Role: Space-constrained LED driver supporting dual-mode (flash/torch) via microcontroller-controlled EN and ISET resistor switching. Use Value: 3mm × 3mm DFN package with all components <1mm height enables integration into ultra-thin form factors without compromising thermal performance. |
Use Scenario: Reliable, low-noise illumination source for fiber-coupled endoscopic imaging where EMI must not interfere with sensor signals. IC Role / Device Role / Timing Role: Low-EMI charge pump driver powering miniature white LEDs with minimal conducted/radiated noise due to absence of inductors and fixed-frequency operation. Use Value: Meets stringent medical EMC requirements; open/short LED protection prevents hazardous failure modes during clinical use. |
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 |
|---|---|---|---|
| LTC3214 | 500mA max continuous current; identical 10-lead DFN package and 1x/1.5x/2x architecture; lower peak current rating. | Targeted at mid-power camera modules where 700mA flash is unnecessary; slightly lower thermal dissipation. | Select LTC3214 when system-level flash intensity requirements are ≤500mA and BOM cost optimization is prioritized. |
| LTC3217 | 600mA max current; supports up to 4 independent LEDs; includes separate torch/flash enable and ISET pins; 3mm × 3mm QFN package. | Designed for multi-LED displays (e.g., front-facing dual-LED flash); adds independent control not present in LTC3215EDD#PBF. | Choose LTC3217 for applications requiring independent brightness control of multiple LEDs or higher channel count. |
Compared with LTC3214 and LTC3217, the LTC3215EDD#PBF offers the highest single-LED peak current (700mA) in a minimal 10-lead DFN footprint, making it optimal for compact, high-intensity single-flash systems where thermal budget allows pulsed operation.
Availability
LTC3215EDD#PBF is available at Aetrix Electronics and suitable for smartphone camera flash modules, portable medical imaging devices, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3215EDD#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, documentation, and manufacturing continuity for legacy Linear parts including the LTC3215EDD#PBF.
The LTC3215EDD#PBF belongs to Linear's high-efficiency LED driver product line, engineered specifically for low-noise, inductorless camera lighting in battery-powered portable electronics with stringent size and EMI constraints.
FAQ
What is the maximum continuous LED current supported by the LTC3215EDD#PBF?
The LTC3215EDD#PBF supports 350mA continuous LED current under standard thermal conditions (–40°C to 85°C ambient, proper PCB copper area). This limit is defined by long-term current density and junction temperature constraints - exceeding it risks thermal shutdown activation. The 700mA rating applies only to pulsed operation with controlled duty cycle and adequate heat sinking, as confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet.
How does the LTC3215EDD#PBF implement automatic mode switching between 1x, 1.5x, and 2x charge pump operation?
The LTC3215EDD#PBF monitors voltage drop across its internal ILED current source. When dropout exceeds 120mV (indicating insufficient headroom for regulation), it initiates a ~2.5ms warm-up delay before transitioning to the next higher boost mode - from 1x (VIN pass-through) to 1.5x (4.6V CPO) or 1.5x to 2x (5.1V CPO). This decision is made autonomously without external control, ensuring optimal efficiency across varying LED forward voltage and input supply conditions.
What is the recommended value and placement of the ISET programming resistor for a 500mA LED current using the LTC3215EDD#PBF?
For 500mA LED current, the ISET resistor should be 3990 Ω / 500 mA = 7.98kΩ - a standard 7.87kΩ (1%) resistor yields 501.3mA, well within ±4% accuracy. Place RSET directly between ISET (Pin 1) and GND with shortest possible trace length; avoid routing near noisy nodes like C1+/C2+ to prevent current regulation errors. Do not use values ≤2kΩ, as this triggers overcurrent shutdown.
Does the LTC3215EDD#PBF provide protection against LED open-circuit or short-circuit faults?
Yes, the LTC3215EDD#PBF includes integrated open/short LED protection. An open circuit is detected when CPO voltage exceeds 1.5V (indicating no current flow), and a short is detected when CPO falls below 0.5V (indicating excessive current). In either case, the part disables the charge pump and ILED output to prevent damage or uncontrolled power dissipation - a feature explicitly documented in the Electrical Characteristics table under "CPO Short Circuit Detection".
What thermal management practices are required to ensure reliable operation of the LTC3215EDD#PBF at 700mA peak current?
To sustain 700mA peak current reliably, the LTC3215EDD#PBF requires direct thermal coupling via its exposed pad (Pin 11) to a large, low-impedance PCB ground plane using ≥4 thermal vias (0.3mm diameter, filled or plated). Maintain ≥100mm² copper area under the device, minimize trace inductance on VIN/CPO/ILED paths, and avoid enclosing the IC in sealed enclosures. Thermal shutdown triggers at ~150°C junction temperature, so board-level thermal resistance must keep TJ ≤135°C during pulsed operation.
LTC3215EDD#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):
- 4.4V
- Voltage - Output:
- -
- Current - Output / Channel:
- 700mA
- 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)
LTC3215EDD#PBF FAQ
1.How can I place an order for LTC3215EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3215EDD#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 LTC3215EDD#PBF reliable?
The price and inventory of LTC3215EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3215EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3215EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3215EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3215EDD#PBF?
LTC3215EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3215EDD#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 LTC3215EDD#PBF?
For technical support, including LTC3215EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3215EDD#PBF requirements.
6.How does Aetrix verify that LTC3215EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3215EDD#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 LTC3215EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3215EDD#PBF?
All LTC3215EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3215EDD#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 LTC3215EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3215EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3215EDD#PBF Tags
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