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Analog Devices Inc. LTC3216EDE#TRPBF
- Part No.:
- LTC3216EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3216EDE#TRPBF.pdf
- Description:
- IC REG CONV LED 1OUT 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,451
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Product details
Overview
LTC3216EDE#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, high-current charge pump DC/DC converter designed to drive white LEDs in camera flash and torch applications. It delivers up to 1A output current with independent 200mA torch and 800mA flash programming, operates from 2.9V–4.4V input, and features automatic 1x/1.5x/2x mode switching for optimal efficiency in mobile phone LED lighting systems.
For engineers reviewing the LTC3216EDE#TRPBF datasheet, LTC3216EDE#TRPBF pinout, LTC3216EDE#TRPBF application, or LTC3216EDE#TRPBF equivalent, key selection considerations include ILED dropout voltage (120mV), 4% LED current accuracy, 900kHz fixed-frequency operation, open/shorted LED protection, and thermal shutdown at ~150°C - all critical for compact, battery-powered imaging subsystems.
Technical Context
The LTC3216EDE#TRPBF implements a fractional switched-capacitor architecture with nonoverlapping 900kHz clocking to enable 1x (direct VIN-to-CPO), 1.5x (4.6V regulated), and 2x (5.1V regulated) charge pump modes. Mode transitions are triggered by real-time dropout detection at the ILED pin, with programmable warm-up delays (150ms in torch, 2ms in flash mode) to accommodate LED forward voltage settling.
Current regulation is achieved via two independent 1.22V-referenced ISET pins driving external resistors (RSET = 3965/ILED), supporting discrete low-current (200mA), high-current (800mA), and summed (1A) output states. The ultralow-dropout current source maintains accuracy down to 120mV headroom, while integrated soft-start limits inrush current during startup and mode changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.4V - compatible with single-cell Li-ion/Li-polymer batteries without pre-regulation. |
| Max Output Current | 1A pulsed (10% duty cycle) - supports high-intensity flash bursts in smartphone cameras. |
| LED Current Accuracy | ±4% - ensures consistent brightness across production units and temperature range (–40°C to 85°C). |
| Switching Frequency | 900kHz (typ) - enables use of small 2.2μF ceramic flying capacitors and minimizes EMI filtering needs. |
| Shutdown Current | 2.5μA - preserves battery life during idle periods in always-on mobile devices. |
| Dropout Voltage | 120mV at 200mA - sustains accurate LED current even as battery discharges below 3.0V. |
| Charge Pump Modes | 1x (VIN), 1.5x (4.6V), 2x (5.1V) - automatically selected to maximize efficiency per LED VF and input voltage. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 13), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+, C1−, C2+, C2− (Pins 1,2,10,12) | Flying capacitor interfaces | Connect 2.2μF X5R/X7R ceramics; bidirectional high-dv/dt nodes requiring tight layout to minimize EMI. |
| CPO (Pin 3) | Charge pump output | Supplies regulated voltage to LED anode; requires 4.7μF ceramic bypass to GND for ripple control and loop stability. |
| ISET1, ISET2 (Pins 4,6) | Current programming reference inputs | Each servos to 1.22V; resistor-to-GND sets torch (ISET1) and flash (ISET2) currents independently. |
| ILED (Pin 5) | LED current sink output | Drives LED cathode; current magnitude determined by EN1/EN2 logic state and ISET resistor values. |
| EN1, EN2 (Pins 7,8) | Digital mode select inputs | CMOS-compatible; define shutdown (00), torch (10), flash (01), or combined (11) output states. |
| VIN (Pin 9) | Main power input | 2.9V–4.4V supply; must be bypassed with ≥2.2μF low-ESR ceramic capacitor directly to GND. |
| GND (Pin 11) | Charge pump ground | Low-impedance return path for flying capacitors and internal switches; connects to PCB ground plane. |
| Exposed Pad (Pin 13) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation (θJA = 43°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI, enabling <1mm profile designs ideal for slim smartphones. |
| Independent torch/flash control | Separate ISET1/ISET2 resistors allow precise tuning of low-power illumination (200mA) and high-power strobe (800mA) without firmware changes. |
| Automatic mode switching | Hardware-based transition between 1x→1.5x→2x modes avoids software overhead and ensures deterministic response to LED VF drift. |
| Open/shorted LED protection | Detects fault conditions and disables output to prevent damage during assembly or field failure - no external circuitry required. |
| Ultralow dropout current source | Maintains ±4% current regulation with only 120mV headroom, extending usable battery range in low-VIN scenarios. |
Applications
| Smartphone Camera Flash | Front-Facing Torch Light |
|---|---|
Use Scenario: High-intensity, short-duration illumination for rear-facing camera capture in low-light environments. IC Role / Device Role / Timing Role: Constant-current charge pump delivering up to 800mA to Luxeon Flash LEDs with sub-2ms mode-switching latency. Use Value: Enables 1/1000s exposure capture with consistent color rendering and minimal thermal derating due to 120mV dropout voltage. |
Use Scenario: Continuous low-power illumination for video calls, facial recognition, or ambient light sensing. IC Role / Device Role / Timing Role: Precision 200mA current source with independent EN1 control and <150ms warm-up delay to stabilize LED VF. Use Value: Provides flicker-free, battery-efficient lighting with <2.5μA shutdown current and automatic 1x-mode efficiency optimization. |
| Digital Camera Strobe Module | Portable Medical Imaging Light |
Use Scenario: Synchronized multi-pulse flash sequences in compact digital cameras with dual-LED arrays. IC Role / Device Role / Timing Role: Dual ISET programming enables sequential or parallel activation of separate LED strings via EN1/EN2 truth table. Use Value: Delivers repeatable 1A peak current pulses with <130μs EN-to-ILED turn-on time and built-in overtemperature cycling protection. |
Use Scenario: Sterile, low-EMI illumination for handheld dermatoscopes or otoscopes requiring stable spectral output. IC Role / Device Role / Timing Role: Low-noise constant-frequency charge pump eliminating inductor-induced interference near sensitive analog sensors. Use Value: Achieves <10mVP-P CPO ripple (with 4.7μF CCPO) and 900kHz fundamental frequency easily filtered from adjacent signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3206EDE#TRPBF | 400mA max output, 800kHz switching, fixed 5.5V VOUT, no independent torch/flash control | Targeted at multi-display backlighting, not high-current flash; lacks dropout-aware mode switching | Select when lower peak current and simpler dual-LED biasing suffice; not suitable for >600mA flash demands. |
| LT3467EFE#TRPBF | 1.1A switch-current boost converter, 1.3MHz, requires external inductor, higher quiescent current (1.2mA) | Better suited for wide-input (2.4V–16V) industrial LED drivers; no integrated LED protection or thermal shutdown | Choose for higher VIN ranges or where inductor-based efficiency outweighs board-space constraints; adds BOM complexity. |
Compared with LTC3216EDE#TRPBF, LTC3206EDE#TRPBF trades peak current and adaptive mode control for lower cost and simpler biasing, while LT3467EFE#TRPBF offers broader input range and higher switching frequency at the expense of inductor dependency and missing LED fault protections.
Availability
LTC3216EDE#TRPBF is available at Aetrix Electronics and suitable for smartphone camera modules, portable medical imaging devices, and digital camera strobe circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3216EDE#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 precision analog and power management product lines with full technical documentation and long-term manufacturing commitment.
The LTC3216EDE#TRPBF belongs to Linear's high-efficiency LED driver family, engineered specifically for space-constrained, battery-powered imaging applications demanding low noise, high current accuracy, and autonomous power-path optimization.
FAQ
What is the maximum continuous output current supported by the LTC3216EDE#TRPBF?
The LTC3216EDE#TRPBF supports 500mA continuous output current. Its 1A rating applies only to pulsed operation with ≤10% duty cycle and appropriate thermal management. Exceeding 500mA continuously risks triggering thermal shutdown (~150°C junction limit), especially without adequate PCB copper area connected to the exposed pad.
How does the LTC3216EDE#TRPBF achieve automatic mode switching between 1x, 1.5x, and 2x charge pump operation?
The LTC3216EDE#TRPBF monitors voltage headroom at the ILED pin. When dropout is detected (i.e., insufficient voltage across the current source), it transitions after a fixed delay-150ms in torch mode or 2ms in flash mode-to the next higher gain mode. The LTC3216EDE#TRPBF resets to 1x mode only upon entering shutdown (EN1=EN2=LOW) and subsequent re-enablement.
Can the LTC3216EDE#TRPBF drive multiple LEDs in series or parallel configurations?
The LTC3216EDE#TRPBF is designed as a single-string LED current sink. Driving multiple LEDs in series exceeds its 5.1V 2x-mode output capability for typical white LEDs. Parallel strings require individual current-setting resistors and careful thermal balancing; the LTC3216EDE#TRPBF does not provide per-string regulation or mismatch compensation.
What is the purpose of the exposed pad (Pin 13) on the LTC3216EDE#TRPBF DFN package?
The exposed pad on the LTC3216EDE#TRPBF serves as both thermal dissipation path and electrical ground reference. It must be soldered to a solid PCB ground plane to achieve θJA = 43°C/W and ensure stable operation under 1A pulsed loads. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown.
Does the LTC3216EDE#TRPBF include protection against LED open-circuit or short-circuit faults?
Yes, the LTC3216EDE#TRPBF integrates both open-LED and shorted-LED protection. An open-circuit condition disables the output and places the device in a low-power state, while a shorted-LED fault triggers immediate shutdown. These protections operate autonomously without external components, enhancing system reliability in consumer imaging products.
LTC3216EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, High Current LEDs
- Voltage - Input:
- 2.9V ~ 4.4V
- Number of Outputs:
- 1
- Voltage - Output:
- Multiple
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3216EDE#TRPBF FAQ
1.How can I place an order for LTC3216EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3216EDE#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 LTC3216EDE#TRPBF reliable?
The price and inventory of LTC3216EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3216EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3216EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3216EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3216EDE#TRPBF?
LTC3216EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3216EDE#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 LTC3216EDE#TRPBF?
For technical support, including LTC3216EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3216EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3216EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3216EDE#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 LTC3216EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3216EDE#TRPBF?
All LTC3216EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3216EDE#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 LTC3216EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3216EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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