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Analog Devices Inc. LTC3215EDD#TRPBF
- Part No.:
- LTC3215EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3215EDD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 700MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,085
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Product details
Overview
LTC3215EDD#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, high-current charge pump DC/DC converter designed to drive white LEDs with programmable current up to 700mA. It operates from 2.9V to 4.4V input, supports automatic 1x/1.5x/2x mode switching, delivers up to 5.1V CPO output in 2x mode, and features ultralow dropout current control for stable LED biasing in mobile camera flash applications.
For engineers reviewing the LTC3215EDD#TRPBF datasheet, LTC3215EDD#TRPBF pinout, LTC3215EDD#TRPBF application, or LTC3215EDD#TRPBF equivalent, key selection criteria include its 10-lead 3mm × 3mm DFN package, 4% LED current programming accuracy, 2.5µA shutdown current, open/shorted LED protection, and compatibility with ceramic flying capacitors only - critical for noise-sensitive portable imaging systems.
Technical Context
The LTC3215EDD#TRPBF implements a fractional switched-capacitor charge pump with nonoverlapping two-phase clocking at 900kHz (typ). Its internal dropout detector monitors ILED voltage to trigger automatic transitions between 1x (VIN → CPO), 1.5x (4.6V regulated), and 2x (5.1V regulated) modes - optimizing efficiency without external control logic.
Regulation relies on a servo-controlled ISET pin (1.22V reference) and closed-loop CPO voltage sensing. The integrated current source maintains ≤120mV dropout at 200mA while supporting pulsed operation up to 700mA via EN toggling, with built-in thermal shutdown at ~150°C and soft-start limiting inrush to <250µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 4.4V - compatible with single-cell Li-ion/Li-poly battery discharge profile. |
| Max ILED Output | 700mA pulsed - enables high-intensity camera flash without inductor-based boost converters. |
| CPO Output Modes | 1x (VIN), 1.5x (4.6V), 2x (5.1V) - auto-switched to maintain LED current as VF rises during warm-up. |
| LED Current Accuracy | ±4% - ensures consistent brightness across production units using RSET = 3990/ILED. |
| Shutdown Current | 2.5µA - preserves battery life in standby mode of always-on imaging devices. |
| Oscillator Frequency | 0.9MHz (typ) - enables use of small 2.2µF ceramic flying capacitors and reduces EMI filtering burden. |
| Package | 10-Lead 3mm × 3mm DFN with exposed pad - provides low θJA (43°C/W) for thermal management at 350mA continuous. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN (DD) with exposed thermal pad (Pin 11, GND). Requires soldering of exposed pad 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 2.2µF ceramic flying cap; polarity reversal occurs during operation - polarized caps prohibited. |
| GND (Pin 9) | Charge pump ground reference | Low-impedance return path for flying caps and internal switches; must tie directly to solid ground plane. |
| C2– (Pin 8) | Flying capacitor negative terminal | Second flying cap node; shares same AC stress as C1– - requires identical capacitor type and placement. |
| VIN (Pin 7) | Main power input | Supplies all internal circuitry; bypass with ≥2.2µF ceramic cap close to pin to limit input ripple and noise. |
| EN (Pin 6) | Enable/shutdown control | CMOS-compatible input; drives part into 2.5µA shutdown when pulled low; must not float. |
| C2+ (Pin 5) | Flying capacitor positive terminal | Connects to positive side of second flying cap; high dv/dt node - minimize trace length and loop area. |
| C1+ (Pin 4) | Flying capacitor positive terminal | First flying cap node; pairs with C1– to form charge transfer path in 1.5x/2x modes. |
| CPO (Pin 3) | Charge pump output | Regulated voltage output (1x/1.5x/2x); connects to LED anode; requires 4.7µF ceramic output cap to ground. |
| ILED (Pin 2) | LED current sink output | Sinks programmed current from LED cathode to ground; disconnects from VIN during shutdown. |
| ISET (Pin 1) | Current programming reference | Servos to 1.22V; RSET to GND sets ILED per RSET = 3990/ILED; short-circuit triggers overcurrent shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI, size, and cost of inductors - enables <1mm profile designs for ultra-thin smartphones. |
| Automatic mode switching | Transitions between 1x/1.5x/2x based on real-time ILED dropout detection - avoids manual mode control and firmware overhead. |
| Ultralow dropout current source | Maintains ±4% regulation down to 120mV headroom - supports low-VF LEDs and extends usable battery range. |
| Open/shorted LED protection | Detects fault conditions and disables output - prevents damage during LED replacement or board-level failure. |
| Tiny external component count | Only two 2.2µF flying caps, one RSET, and two bypass caps required - reduces BOM cost and layout complexity. |
Applications
| Smartphone Camera Flash | Tablet Torch Lighting |
|---|---|
Use Scenario: High-intensity pulsed illumination for smartphone rear-facing cameras during low-light photography. IC Role / Device Role / Timing Role: Charge pump LED driver providing 500mA–700mA flash current with <2.5ms warm-up time and automatic mode switching to sustain brightness as LED VF increases. Use Value: Enables consistent 200-lux+ illumination at 1m distance using single-cell battery input, with no inductor-induced EMI interfering with RF receivers. | Use Scenario: Continuous torch-mode lighting for tablets used in industrial field service or medical diagnostics. IC Role / Device Role / Timing Role: Constant-current LED driver delivering 350mA continuously with thermal shutdown protection and <120mV dropout to maximize runtime on 3.7V Li-ion. Use Value: Provides >4 hours of usable torch light per charge while maintaining stable color temperature and avoiding thermal derating. |
| Digital Camera Strobe | Portable Medical Imaging Light |
Use Scenario: Synchronized strobe illumination in compact digital cameras with mechanical shutter timing constraints. IC Role / Device Role / Timing Role: Fast-enable LED driver with 130µs EN-to-ILED turn-on and programmable current matching sensor exposure duration. Use Value: Eliminates motion blur by precisely aligning 500mA flash pulse with shutter open time, independent of battery voltage sag. | Use Scenario: Sterile, low-EMI illumination for handheld dermatoscopes and otoscopes requiring FCC/IEC 60601 compliance. IC Role / Device Role / Timing Role: EMI-optimized charge pump driver powering 3W white LEDs with <10mVpp CPO ripple and no magnetic field emissions. Use Value: Meets Class B conducted/radiated emission limits without shielding or ferrites, reducing certification risk and bill-of-materials. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3214EDE#TRPBF | 500mA max ILED, same 3mm × 3mm DFN package, identical pinout, but lacks 2x mode and has lower CPO regulation voltage (4.4V vs 5.1V). | Targeted at lower-power camera modules where 700mA flash is unnecessary and 4.4V CPO suffices for dual-LED strings. | Select when thermal budget is tighter and peak current demand is ≤500mA - saves 0.1mm² board area with identical footprint. |
| LTC3217EFE#TRPBF | 600mA max ILED, adds independent torch/flash enable pins and separate ISET inputs, uses 3mm × 3mm QFN (16-lead) - different pinout and package. | Designed for dual-mode imaging systems requiring simultaneous torch + flash control without MCU GPIO overhead. | Choose when system requires hardware-gated torch/flash sequencing - requires PCB redesign due to QFN package and pin count increase. |
Compared with LTC3214EDE#TRPBF and LTC3217EFE#TRPBF, the LTC3215EDD#TRPBF uniquely balances 700mA peak capability, 2x mode headroom for high-VF LEDs, and minimal 10-pin DFN footprint - making it optimal for space-constrained single-flash-camera designs where full 2x regulation margin is required.
Availability
LTC3215EDD#TRPBF is available at Aetrix Electronics and suitable for smartphone camera flash, tablet torch lighting, and portable medical imaging devices requiring stable component supply across high-volume consumer electronics production cycles.
Supply support for LTC3215EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3215EDD#TRPBF belongs to Linear's LED Power Management product line, engineered specifically for low-noise, high-current portable imaging applications where inductor-free solutions, battery efficiency, and compact form factor are mandatory design requirements.
FAQ
What is the maximum continuous LED current supported by the LTC3215EDD#TRPBF?
The LTC3215EDD#TRPBF supports 350mA continuous LED current. While its datasheet specifies up to 700mA for pulsed operation, sustained current above 350mA risks thermal shutdown under typical PCB thermal conditions. This limit arises from junction temperature constraints - the device enters thermal shutdown at ~150°C and re-enables at ~135°C. For continuous operation, proper heat sinking via the exposed pad is essential to maintain reliability of the LTC3215EDD#TRPBF.
How does the LTC3215EDD#TRPBF achieve automatic mode switching between 1x, 1.5x, and 2x charge pump operation?
The LTC3215EDD#TRPBF monitors voltage at the ILED pin to detect dropout conditions. When the voltage across the internal current source falls below ~120mV, the device initiates a 2.5ms delay before switching to the next higher gain mode (e.g., 1x → 1.5x). This delay allows LED forward voltage to stabilize during warm-up. Mode transitions are fully autonomous and require no external control signals - a core feature enabling robust operation of the LTC3215EDD#TRPBF across varying LED VF and battery voltage conditions.
Can polarized capacitors such as tantalum be used for the flying capacitors in the LTC3215EDD#TRPBF circuit?
No, polarized capacitors must never be used for flying capacitors with the LTC3215EDD#TRPBF. During startup and mode transitions, voltage reversal occurs across C1 and C2 pins - which would damage tantalum or aluminum electrolytic capacitors. Only X5R or X7R ceramic capacitors rated for ≥6.3V and ≥2.2µF are permitted. Using incorrect capacitors risks catastrophic failure and invalidates the guaranteed 4% LED current accuracy of the LTC3215EDD#TRPBF.
What is the purpose of the exposed thermal pad (Pin 11) on the LTC3215EDD#TRPBF package?
The exposed thermal pad (Pin 11) on the LTC3215EDD#TRPBF is electrically and thermally connected to GND. It must be soldered to a large copper ground plane using multiple vias to achieve the specified θJA of 43°C/W. This pad dissipates up to 1.2W under worst-case 700mA pulsed operation and prevents thermal shutdown. Failure to properly connect the pad degrades both thermal performance and current regulation accuracy of the LTC3215EDD#TRPBF, especially in compact handheld enclosures.
How is LED current programmed on the LTC3215EDD#TRPBF, and what resistor value is needed for 500mA output?
LED current is programmed by connecting a resistor (RSET) between the ISET pin and GND. The LTC3215EDD#TRPBF regulates ISET to 1.22V, so RSET = 1.22V / ISET_CURRENT. Given the ILED/ISET ratio of 3270 (typ), RSET = 3990 / ILED. For 500mA, RSET = 3990 / 0.5 = 7.98kΩ - a standard 7.87kΩ (1%) resistor yields 507mA. Values ≤2kΩ force overcurrent shutdown, protecting the LTC3215EDD#TRPBF from damage.
LTC3215EDD#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):
- 4.4V
- 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#TRPBF FAQ
1.How can I place an order for LTC3215EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3215EDD#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 LTC3215EDD#TRPBF reliable?
The price and inventory of LTC3215EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3215EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3215EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3215EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3215EDD#TRPBF?
LTC3215EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3215EDD#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 LTC3215EDD#TRPBF?
For technical support, including LTC3215EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3215EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3215EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3215EDD#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 LTC3215EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3215EDD#TRPBF?
All LTC3215EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3215EDD#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 LTC3215EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3215EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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