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Analog Devices Inc. LTC3217EUD#PBF
- Part No.:
- LTC3217EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3217EUD#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 150MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:119
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Product details
Overview
LTC3217EUD#PBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode switched-capacitor DC/DC charge pump IC designed to drive four high-current white LEDs in camera flash/torch applications. It delivers up to 600mA total output current across four independent current sources, operates from 2.9V to 4.5V input, and features automatic 1x/1.5x/2x mode switching based on LED dropout detection. It powers mobile phone camera modules requiring precise, low-ripple LED current control.
For engineers reviewing the LTC3217EUD#PBF datasheet, LTC3217EUD#PBF pinout, LTC3217EUD#PBF application, or LTC3217EUD#PBF equivalent, key selection criteria include its 16-pin 3mm × 3mm QFN package, dual ISET resistor programming for independent torch/flash current levels, EN2 PWM brightness control with 50μs minimum pulse width, and open/short LED protection - all critical for compact, thermally constrained imaging power designs.
Technical Context
The LTC3217EUD#PBF implements a two-phase non-overlapping 850kHz oscillator to drive flying capacitors (C1P/C1M/C2P/C2M) for charge pump operation. Its regulation architecture senses CPO voltage and modulates pump strength to maintain 1.5x mode at 4.5V or 2x mode at 5.05V output, with open-loop output impedance of 2.8Ω (1.5x) and 3.2Ω (2x) under specified conditions.
LED current is delivered via four matched, low-dropout current sources (≤330mV dropout at 100mA), each programmable through ISET1/ISET2 pins servoing to 1.22V. Mode transitions occur within 2.5ms of dropout detection, and soft-start limits inrush during startup and mode changes by linearly ramping CPO current over ~125μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.5V - supports single-cell Li-ion battery operation without LDO pre-regulation. |
| Total Output Current | Up to 600mA - enables simultaneous drive of four 150mA LEDs or mixed torch/flash configurations. |
| Charge Pump Modes | 1x / 1.5x / 2x - auto-switching preserves efficiency; 1x mode connects VBAT directly to CPO for minimal noise and loss. |
| LED Dropout Voltage | 330mV at 100mA - ensures stable current delivery even as LED forward voltage rises with temperature. |
| Oscillator Frequency | 0.85MHz typical - enables use of small 2.2μF ceramic flying/output capacitors and reduces EMI filtering burden. |
| Shutdown Current | 4μA - minimizes battery drain during idle periods in portable imaging systems. |
| Current Matching | ±1% between any two outputs at 100mA - maintains uniform LED brightness across multi-LED arrays. |
Pinout & Package
The LTC3217EUD#PBF is housed in a 16-lead, 3mm × 3mm × 0.75mm plastic QFN package with exposed thermal pad (Pin 17) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1P, C1M, C2P, C2M (Pins 1,14,12,16) | Flying capacitor connections | Interface with external 2.2μF X7R/X5R ceramics to enable charge transfer in 1.5x/2x modes; polarity reversal during startup forbids polarized caps. |
| CPO (Pin 2) | Charge pump output | Common anode supply for all four LEDs; regulated at VBAT (1x), 1.5×VBAT (1.5x), or 2×VBAT (2x); short-circuit protected down to 0.4V threshold. |
| EN1, EN2 (Pins 3,11) | Logic control inputs | Select shutdown (0,0), low-current torch (1,0), high-current flash (0,1), or combined mode (1,1); EN2 supports PWM dimming with 50μs min pulse width. |
| LED1–LED4 (Pins 4–7) | LED current sink outputs | Four independent 150mA-rated current sources; each can be disabled by tying to CPO (10μA leakage), enabling flexible per-LED control. |
| ISET1, ISET2 (Pins 9,10) | Current programming references | Servo to 1.22V; resistors to GND set torch/flash current levels per Equation RSET = 488/ILED; ≤2kΩ triggers overcurrent shutdown. |
| VBAT (Pin 15) | Main supply input | Accepts 2.9–4.5V; requires ≥2.2μF low-ESR ceramic bypass; internal 250kΩ pull-downs on EN1/EN2 ensure defined state at power-up. |
| GND1, GND2 (Pins 13,8) | Separate ground returns | GND1 handles charge pump switching currents; GND2 serves analog/LED current source reference - separation reduces noise coupling. |
| Exposed Pad (Pin 17) | Thermal & electrical ground | Mandatory connection to low-impedance PCB ground plane via multiple vias; primary path for heat dissipation and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic mode switching | Transitions from 1x → 1.5x → 2x based on real-time LED dropout detection, optimizing efficiency without external control logic. |
| Independent torch/flash programming | Dual ISET pins allow separate resistor-defined current levels (e.g., 75mA torch + 150mA flash), eliminating need for external current-setting DACs. |
| Low-noise constant-frequency operation | Fixed 850kHz switching minimizes EMI peaks and simplifies filtering versus variable-frequency architectures. |
| Open/short LED fault protection | Detects open loads via unused LED pin threshold (0.5–1.5V) and shorts via CPO voltage <0.4V, forcing shutdown to prevent damage. |
| No inductors required | Capacitor-based topology eliminates magnetic components, reducing board area, cost, and EMI concerns in space-constrained camera modules. |
Applications
| Smartphone Camera Flash | Tablet Imaging Module |
|---|---|
Use Scenario: High-intensity burst illumination for low-light photography in flagship smartphones with quad-LED camera arrays. IC Role / Device Role / Timing Role: Four-channel LED current controller and adaptive voltage booster delivering synchronized 150mA pulses to white LEDs. Use Value: Enables 2x mode boost to 5.05V when VBAT drops below 3.2V, sustaining full flash brightness across battery discharge cycle without compromising efficiency in 1x mode at higher voltages. | Use Scenario: Dual-mode lighting for video conferencing and document scanning in Android tablets with front/rear cameras. IC Role / Device Role / Timing Role: Torch/flash dual-current source managing 75mA continuous (torch) and 100mA pulsed (flash) LED output via EN1/EN2 logic states. Use Value: Independent ISET1/ISET2 programming allows optimized thermal management - lower torch current extends LED lifetime while flash current meets ISO exposure requirements. |
| Digital Still Camera (DSC) Auxiliary Light | PDA Barcode Scanner Illumination |
Use Scenario: Compact auxiliary focus assist light in ultra-thin digital cameras where inductor-based solutions exceed height constraints. IC Role / Device Role / Timing Role: Low-profile QFN-packaged charge pump supplying 400mA total to two parallel LED strings with matched current sharing. Use Value: 3mm × 3mm footprint and no-inductor design meet strict mechanical envelope requirements while maintaining <1% current matching for consistent color rendering. | Use Scenario: Short-duration, high-brightness illumination for CCD/CMOS barcode readers in industrial PDAs operating from 3.6V Li-ion cells. IC Role / Device Role / Timing Role: Fast-response LED driver with 2.5ms mode-switching latency and EN2 PWM dimming for precise exposure timing control. Use Value: 50μs minimum EN2 pulse width enables microsecond-level flash duration tuning, critical for motion-blur-free barcode capture at varying distances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8630YETE+T | 4-channel, 600mA total, 1.5x/2x only (no 1x pass-through), 1.2MHz switching, requires different ISET configuration. | Lacks 1x mode - higher quiescent current in high-VBAT conditions; no independent torch/flash enable logic. | Choose MAX8630YETE+T only if system prioritizes higher switching frequency over 1x efficiency and accepts fixed dual-mode operation. |
| TPS61165DRVR | Single-output, 400mA max, inductor-based boost, 1.2MHz, integrated MOSFETs, no multimode auto-switching. | Cannot drive four independent LEDs; requires external current-setting resistors per channel; larger solution size due to inductor. | Choose TPS61165DRVR only for single-LED applications where inductor tolerance is acceptable and board area is not constrained. |
Compared with MAX8630YETE+T and TPS61165DRVR, the LTC3217EUD#PBF uniquely combines true 1x/1.5x/2x auto-switching, four independent current sinks, and no-inductor operation - making it the only option that simultaneously satisfies smartphone camera module requirements for efficiency across battery voltage range, compactness, and multi-LED control granularity.
Availability
LTC3217EUD#PBF is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and digital still camera auxiliary lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3217EUD#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 its precision analog and power management product lines. Linear pioneered high-performance charge pump architectures for portable imaging.
The LTC3217EUD#PBF belongs to Linear's LED driver IC family engineered specifically for multi-LED camera flash/torch power in space- and noise-sensitive mobile devices, emphasizing efficiency, integration, and robust fault protection.
FAQ
What is the maximum continuous output current per LED channel for the LTC3217EUD#PBF?
The LTC3217EUD#PBF supports up to 150mA continuous current per LED channel (LED1–LED4), with total output current capped at 600mA. This rating is validated under thermal conditions where junction temperature remains within specification; sustained 150mA operation requires proper PCB thermal design including exposed pad soldering to a solid ground plane.
How does the LTC3217EUD#PBF handle LED open-circuit faults?
The LTC3217EUD#PBF detects open LEDs by monitoring the voltage difference between CPO and each LED pin; if VCPO – VLED exceeds 1.5V (with test current of 4–16μA), the part flags an open condition. While not triggering immediate shutdown, this detection informs system-level diagnostics - the device continues operating other enabled channels, maintaining partial functionality during fault conditions.
Can the LTC3217EUD#PBF operate with a 2.7V input supply?
No - the LTC3217EUD#PBF has a minimum specified VBAT operating voltage of 2.9V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.9V is not guaranteed and may result in failure to start, incorrect mode switching, or unstable current regulation; systems requiring 2.7V operation should select alternative drivers with wider input ranges.
What is the purpose of separating GND1 and GND2 in the LTC3217EUD#PBF layout?
GND1 serves as the return path for high-di/dt charge pump switching currents, while GND2 provides a quiet reference for LED current sources and analog circuitry. Separating these grounds minimizes noise coupling from switching transients into current-sense paths, preserving <1% LED current matching accuracy and preventing false dropout detection during dynamic load changes.
Does the LTC3217EUD#PBF require external compensation components for stability?
No - the LTC3217EUD#PBF uses an internally compensated control loop where the output capacitor (CCPO) serves as the dominant pole. Stability is ensured when CCPO ≥1μF with ESR <100mΩ (e.g., X7R MLCC); no external compensation network is needed, simplifying design and reducing bill-of-materials count.
LTC3217EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 150mA
- Frequency:
- 850kHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3217EUD#PBF FAQ
1.How can I place an order for LTC3217EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3217EUD#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 LTC3217EUD#PBF reliable?
The price and inventory of LTC3217EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3217EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3217EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3217EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3217EUD#PBF?
LTC3217EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3217EUD#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 LTC3217EUD#PBF?
For technical support, including LTC3217EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3217EUD#PBF requirements.
6.How does Aetrix verify that LTC3217EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3217EUD#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 LTC3217EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3217EUD#PBF?
All LTC3217EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3217EUD#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 LTC3217EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3217EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3217EUD#PBF Tags
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