My Inquiry
My Account
Analog Devices Inc. LTC3217EUD#TRPBF
- Part No.:
- LTC3217EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3217EUD#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 150MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3217EUD#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump DC/DC converter designed to drive four high-current white LEDs in camera flash/torch applications. It delivers up to 600mA total output current across four independent LED 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 is used in cellphone and DSC camera modules requiring compact, inductorless LED power with PWM brightness control.
For engineers reviewing the LTC3217EUD#TRPBF datasheet, LTC3217EUD#TRPBF pinout, LTC3217EUD#TRPBF application, or LTC3217EUD#TRPBF equivalent, key selection criteria include its 16-lead 3mm × 3mm QFN package, dual ISET resistor programming for independent torch/flash current levels, EN2-pin PWM dimming capability, open/short LED protection, and guaranteed operation from –40°C to 85°C.
Technical Context
The LTC3217EUD#TRPBF implements a constant-frequency (850kHz) switched-capacitor charge pump with automatic mode transition logic: it powers up in 1x mode (VBAT directly connected to CPO), switches to 1.5x mode upon first LED dropout (targeting 4.5V CPO), then to 2x mode upon subsequent dropout (targeting 5.05V CPO). Regulation is achieved by sensing CPO voltage and modulating pump strength via internal Thevenin-equivalent output impedance.
Each of the four LED outputs is a precision current source programmed via external resistors on ISET1 and ISET2 pins (servo voltage = 1.22V), with discrete current settings selected by EN1/EN2 logic inputs. Soft-start limits inrush during startup and mode transitions, while built-in thermal shutdown (>150°C) and CPO short-circuit detection (<0.8V) provide robust fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 4.5V - supports single-cell Li-ion battery operation without overvoltage risk. |
| Total Output Current | Up to 600mA - enables simultaneous driving of four 150mA LEDs or mixed torch/flash configurations. |
| Charge Pump Modes | 1x / 1.5x / 2x - dynamically optimizes efficiency by minimizing voltage overhead across LED strings. |
| LED Dropout Voltage | 330mV at 100mA - ensures stable current regulation even as LED forward voltage rises with temperature. |
| Oscillator Frequency | 0.85MHz typical - enables use of small 2.2μF ceramic flying/output capacitors; reduces EMI compared to lower-frequency pumps. |
| Shutdown Current | 4μA - minimizes battery drain in standby; triggered by pulling both EN1 and EN2 low. |
| LED Current Matching | ±1% at 100mA - ensures uniform brightness across four LED channels without external calibration. |
Pinout & Package
The LTC3217EUD#TRPBF is housed in a 16-lead, 3mm × 3mm × 0.75mm plastic QFN package with exposed pad (Pin 17) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1P, C2P, C1M, C2M (Pins 1, 16, 14, 12) | Flying capacitor connections | Interface with two 2.2μF ceramic capacitors to implement charge transfer in 1.5x/2x modes; polarity-insensitive due to AC nature. |
| CPO (Pin 2) | Charge pump output rail | Supplies all four LED anodes; regulated at VBAT (1x), 1.5×VBAT (1.5x), or 2×VBAT (2x); requires 2.2μF output capacitor to ground. |
| EN1, EN2 (Pins 3, 11) | Dual logic control inputs | Select operating mode: shutdown (0,0), torch (1,0), flash (0,1), or combined (1,1); EN2 supports 50μs minimum PWM for brightness control. |
| LED1–LED4 (Pins 4–7) | LED cathode current sinks | Four independent 150mA-rated current sources; each can be disabled by tying to CPO (10μA leakage). |
| ISET1, ISET2 (Pins 9, 10) | Current programming reference | Internal 1.22V reference; external resistors set torch/flash current levels per Equation RSET = 488/ILED. |
| VBAT (Pin 15) | Main supply input | Accepts 2.9–4.5V; requires local 2.2μF low-ESR ceramic bypass capacitor to suppress high-frequency ripple. |
| GND1, GND2 (Pins 8, 13) | Separate analog & charge pump grounds | GND2 serves precision current sources; GND1 handles high-switching-current paths; both must connect to low-impedance ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI, enabling ultra-thin mobile camera module designs. |
| Automatic mode switching | Reduces power loss by using lowest possible voltage gain (1x → 1.5x → 2x) only when required by LED forward voltage. |
| Independent torch/flash current control | Enables dual-mode lighting systems: low-power continuous illumination (torch) and high-brightness burst (flash) with separate resistor programming. |
| Open/short LED fault protection | Detects failed LED conditions (open: VCPO–VLED > 1.5V; short: CPO < 0.8V) and disables output to prevent damage or system instability. |
| Low-noise constant-frequency operation | 850kHz fixed switching frequency simplifies EMI filtering and avoids audible noise in sensitive audio-adjacent layouts. |
Applications
| Smartphone Camera Flash | Digital Still Camera (DSC) Torch |
|---|---|
Use Scenario: High-intensity, short-duration illumination for low-light photography in smartphones with space-constrained front/rear modules. IC Role / Device Role / Timing Role: Four-channel LED current controller with automatic 2x boost mode activation to drive 3.8V+ white LEDs from 3.6V battery. Use Value: Delivers 100mA per LED (400mA total) with ±1% matching and <2.5ms mode-switching delay-enabling consistent exposure and fast flash response. | Use Scenario: Continuous, low-power illumination for video recording or focus assist in compact DSCs and action cameras. IC Role / Device Role / Timing Role: Precision torch-mode current source delivering 25mA per LED (100mA total) with soft-start and thermal foldback. Use Value: Maintains stable brightness over battery discharge (2.9–4.5V) via 1x/1.5x mode optimization and 330mV dropout headroom. |
| PDA Camera Module | Industrial Inspection Light |
Use Scenario: Integrated rear-facing camera in legacy PDA platforms requiring minimal BOM count and no inductors. IC Role / Device Role / Timing Role: Single-chip LED driver with integrated charge pump, current setting, and logic interface-replacing discrete MOSFET + op-amp solutions. Use Value: Reduces component count by ≥7 parts versus discrete implementation while meeting –40°C to 85°C industrial temp range requirements. | Use Scenario: Handheld machine vision tool requiring reliable, flicker-free illumination under varying ambient temperatures. IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown (>150°C), short-circuit protection, and 4μA shutdown current for battery longevity. Use Value: Ensures uninterrupted operation during extended use cycles; exposed-pad QFN package enables effective heat dissipation on metal-core PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8630YETE+T | 4-channel, 30mA max per channel; fixed 1.5x charge pump; no 2x mode; 2.7–5.5V input | Targeted at low-current indicator/backlight apps-not suitable for 100mA+ flash duty | Select LTC3217EUD#TRPBF for higher current, multimode flexibility, and smartphone-grade flash performance. |
| TPS61165DRVR | Single-output, 40V boost converter with integrated 1.2A switch; requires external inductor; 2.7–6V input | Higher voltage capability but larger solution size and inductor-related EMI concerns | Choose LTC3217EUD#TRPBF when inductorless design, compact QFN footprint, and multi-LED integration are mandatory. |
Compared with MAX8630YETE+T and TPS61165DRVR, the LTC3217EUD#TRPBF uniquely combines four independent current sources, automatic 1x/1.5x/2x mode switching, and inductorless operation in a 3mm × 3mm QFN-making it optimal for space-constrained, high-efficiency camera flash systems where discrete inductors are prohibited.
Availability
LTC3217EUD#TRPBF is available at Aetrix Electronics and suitable for smartphone camera modules, digital still camera (DSC) lighting systems, and industrial inspection tools requiring stable component supply, guaranteed –40°C to 85°C operation, and long-term production continuity.
Supply support for LTC3217EUD#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 high-performance analog IC portfolio, emphasizing precision power management, signal conditioning, and RF solutions for demanding industrial and communications applications.
The LTC3217EUD#TRPBF belongs to Linear's LED driver product line, engineered specifically for compact, high-efficiency camera lighting in battery-powered portable devices-prioritizing low noise, multimode efficiency, and seamless integration with mobile SoC control interfaces.
FAQ
What is the maximum continuous output current per LED channel for the LTC3217EUD#TRPBF?
The LTC3217EUD#TRPBF supports up to 150mA per LED channel continuously, with a total output current limit of 600mA across all four channels. This rating assumes proper thermal management-including soldering the exposed pad to a solid ground plane-and operation within the –40°C to 85°C ambient temperature range. Exceeding 150mA per channel may trigger thermal shutdown or reduce reliability.
How does the LTC3217EUD#TRPBF select between 1x, 1.5x, and 2x charge pump modes?
The LTC3217EUD#TRPBF automatically selects charge pump mode based on real-time LED dropout detection: it starts in 1x mode (VBAT connected directly to CPO), switches to 1.5x mode when any enabled LED current source drops out (i.e., insufficient headroom), and enters 2x mode upon a second dropout event. Mode transitions occur within ~2.5ms and reset to 1x only when both EN1 and EN2 are pulled low to enter shutdown.
Can the LTC3217EUD#TRPBF drive LEDs with forward voltages exceeding 4.5V?
Yes-the LTC3217EUD#TRPBF can drive LEDs with forward voltages up to 5.05V by operating in 2x mode, where CPO is regulated to 2×VBAT (up to 5.05V at VBAT = 3.6V). For example, with a 3.1V input and 3.8V LED forward voltage plus 100mV dropout, the 2x mode provides sufficient headroom (2×3.1V − 3.8V − 0.1V = 2.3V advantage voltage), enabling stable 100mA operation where 1.5x mode would fail.
What is the purpose of the separate GND1 and GND2 pins on the LTC3217EUD#TRPBF?
GND1 serves as the charge pump ground, handling high-frequency switching currents from the flying capacitors and CPO path, while GND2 is the analog ground for precision current sources and ISET reference circuitry. Separating these grounds minimizes noise coupling from switching transients into the current regulation loop-ensuring ±1% LED current matching and stable operation. Both pins must connect to a low-impedance ground plane, ideally via dedicated vias under the QFN exposed pad.
Does the LTC3217EUD#TRPBF support PWM dimming, and how is it implemented?
Yes-the LTC3217EUD#TRPBF supports hardware PWM dimming via the EN2 pin, which controls LED brightness independently of current level selection. EN2 accepts pulses with minimum on-time of 50μs and, when EN1 is low, maximum off-time of 1ms to prevent unintended shutdown. When EN1 is high, EN2 PWM has no off-time restriction. This allows fine-grained brightness control without altering the programmed torch/flash current values set by ISET1 and ISET2 resistors.
LTC3217EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN 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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3217EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3217EUD#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 LTC3217EUD#TRPBF reliable?
The price and inventory of LTC3217EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3217EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3217EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3217EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3217EUD#TRPBF?
LTC3217EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3217EUD#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 LTC3217EUD#TRPBF?
For technical support, including LTC3217EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3217EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3217EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3217EUD#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 LTC3217EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3217EUD#TRPBF?
All LTC3217EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3217EUD#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 LTC3217EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3217EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3217EUD#TRPBF 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…
