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Analog Devices Inc. LT3585EDDB-3#TRPBF
- Part No.:
- LT3585EDDB-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3585EDDB-3#TRPBF.pdf
- Description:
- IC CHARGER PHOTOFLASH 10-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,144
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Product details
Overview
LT3585EDDB-3#TRPBF from Analog Devices (formerly Linear Technology) is a highly integrated photo-flash charger IC with integrated IGBT driver, designed for digital/film camera flash systems. It features an on-chip 1.7A peak current NPN power switch, adjustable input current via CHRG/IADJ pin, output voltage detection without external zener/resistors, and supports operation from 1.5V–16V supply. It delivers fast charge times (3.3 sec to 320V into 100µF) using compact flyback transformers.
For engineers reviewing the LT3585EDDB-3#TRPBF datasheet, LT3585EDDB-3#TRPBF pinout, LT3585EDDB-3#TRPBF application, or LT3585EDDB-3#TRPBF equivalent, key selection criteria include peak switch current (1.7A), IGBT drive rise/fall time (0.4µs/0.13µs), DFN-10 package thermal performance (θJA = 76°C/W), and compatibility with 8–12:1 transformer turns ratios for 300–330V output.
Technical Context
The LT3585EDDB-3#TRPBF operates in discontinuous conduction mode (DCM) with edge-controlled switching. Its internal VOUT comparator trips at 31.5V above VBAT, enabling precise output voltage regulation via transformer turns ratio-no external feedback components required. The CHRG/IADJ pin provides three-state control: low (<0.3V) for shutdown, floating (1.1–1.4V) for reduced input current mode, and >1.6V for full-current operation.
It integrates dual IGBT gate drivers: IGBTPU (pull-up) and IGBTPD (pull-down), each independently powered from IGBTPWR (2.5–10V). The driver delivers 50mA peak current, achieves 0.4µs 10%→90% rise time and 0.13µs 90%→10% fall time into 4000pF, and supports safe IGBT turn-off via external series resistor on IGBTPD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Switch Current | 1.7A - sets maximum primary current for fastest charge time (3.3 sec to 320V into 100µF) |
| Output Voltage Detection Threshold | 31.5V above VBAT - enables transformer-ratio-based regulation without external resistive divider |
| IGBT Driver Rise/Fall Time | 0.4µs / 0.13µs into 4000pF - ensures reliable 4kV Xenon lamp trigger pulse generation |
| Input Voltage Range | 1.5V–16V - supports single Li-ion (2.5–4.2V), dual AA (2.0–3.2V), or wide-input portable systems |
| Package Thermal Resistance | θJA = 76°C/W - requires exposed pad soldered to PCB ground plane for thermal management |
| Switch Breakdown Voltage | 60V - limits maximum reflected flyback spike; design must keep SW node ≤50V under worst-case conditions |
| Operating Temperature Range | –40°C to 85°C - specified performance across industrial ambient range |
Pinout & Package
Housed in a 3mm × 2mm, 10-lead plastic DFN package with exposed pad (Pin 11) tied to GND. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IGBTIN (1) | IGBT logic input | Drives IGBT gate: >1.5V → high output, <0.5V → low output; TTL/CMOS compatible |
| IGBTPWR (2) | IGBT driver supply | Local 2.5–10V supply; bypass with ceramic capacitor; powers pull-up/pull-down circuitry independently of charging function |
| GND (3) | Power ground | Common reference for analog/digital blocks; tie directly to local ground plane |
| VIN (4) | Main input supply | 2.5–16V input; UVLO at 2.5V; requires local ceramic bypass |
| VBAT (5) | Battery supply input | 1.5–16V battery rail; UVLO at 1.5V; supports low-voltage battery operation |
| DONE (6) | Open-collector status indicator | NPN collector pulled low when target VOUT reached; requires external pull-up resistor |
| CHRG/IADJ (7) | Charge enable & input current adjust | Three-state control: <0.3V = shutdown, float (1.1–1.4V) = reduced current mode, >1.6V = full current |
| SW (8) | Internal NPN switch collector | Connects to transformer primary; voltage reflects secondary VOUT via turns ratio; max 60V rating |
| IGBTPD (9) | IGBT gate pull-down output | Series resistor required to slow turn-off and prevent IGBT damage; controls quench timing |
| IGBTPU (10) | IGBT gate pull-up output | Direct connection to IGBT gate recommended for fast turn-on and reliable trigger pulse |
Key Features
| Feature | Design Value |
|---|---|
| Integrated IGBT driver with independent power rail | Enables complete Xenon flash control (trigger + quench) without external driver IC or discrete transistors |
| Transformer-ratio-based output voltage setting | Eliminates zener diodes and resistor dividers; simplifies BOM and improves long-term stability |
| Adjustable input current via CHRG/IADJ pin | Extends battery life in portable devices by reducing average input current without changing hardware |
| Small 3mm × 2mm DFN-10 package with exposed pad | Minimizes PCB footprint while enabling thermal dissipation up to 125°C junction temperature |
| Wide input voltage support (1.5V–16V) | Allows direct use with single-cell Li-ion, alkaline, or multi-cell configurations without pre-regulation |
Applications
| Smartphone Camera Flash | Digital SLR Auxiliary Flash |
|---|---|
Use Scenario: Compact mobile phone requiring rapid, high-intensity flash illumination with minimal battery drain. IC Role / Device Role / Timing Role: LT3585EDDB-3#TRPBF charges 100µF flash capacitor to 320V in 3.3 seconds and drives IGBT to trigger Xenon lamp. Use Value: Enables full-power flash from single Li-ion cell (3.6V) with no external feedback components or high-voltage resistors. | Use Scenario: External hot-shoe flash unit needing synchronized trigger and lamp quench for red-eye reduction. IC Role / Device Role / Timing Role: LT3585EDDB-3#TRPBF regulates flash energy and precisely controls IGBT turn-on/turn-off timing for consistent light output. Use Value: Integrated dual IGBT driver eliminates need for separate gate driver IC and reduces component count by ≥4 parts. |
| Emergency Strobe Light | Medical Imaging Flash Module |
Use Scenario: Battery-powered emergency beacon requiring reliable, high-voltage flash pulses under wide temperature ranges. IC Role / Device Role / Timing Role: LT3585EDDB-3#TRPBF operates from 2xAA cells (2.0–3.2V) and maintains stable 320V output across –40°C to 85°C. Use Value: Guaranteed performance over full industrial temperature range eliminates need for thermal derating or external compensation. | Use Scenario: Portable diagnostic imaging device requiring repeatable flash intensity for consistent image capture. IC Role / Device Role / Timing Role: LT3585EDDB-3#TRPBF delivers precise 320V ±0.5V output via transformer-ratio regulation, independent of battery aging. Use Value: Output voltage accuracy remains stable over battery discharge cycle, ensuring consistent flash luminance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar photo-flash charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3585EDDB-0#TRPBF | Lower peak switch current (1.1A vs 1.7A); longer charge time (4.6 sec to 320V) | Suitable for lower-power flash systems where battery life prioritization outweighs speed | Select when transformer size or average input current is more critical than minimum charge time |
| LT3585EDDB-2#TRPBF | Mid-range peak current (0.85A); 5.8 sec charge time; optimized for cost-sensitive mid-tier cameras | Targeted at PDA/camera modules requiring balanced performance and BOM cost | Choose for applications needing faster charge than LT3585-1 but lower peak stress than LT3585-3 |
Compared with LT3585EDDB-0#TRPBF and LT3585EDDB-2#TRPBF, the LT3585EDDB-3#TRPBF delivers the shortest flash charge time (3.3 sec) and highest peak current capability (1.7A), making it optimal for high-end smartphone and DSLR flash modules where speed and intensity are critical.
Availability
LT3585EDDB-3#TRPBF is available at Aetrix Electronics and suitable for smartphone camera flash, digital SLR auxiliary lighting, and emergency strobe applications requiring stable component supply, guaranteed long-term availability, and traceable sourcing.
Supply support for LT3585EDDB-3#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.
The LT3585EDDB-3#TRPBF belongs to the LT3585 photo-flash charger family, engineered specifically for compact, high-efficiency Xenon flash systems in portable imaging devices with stringent size, power, and reliability requirements.
FAQ
What is the maximum output voltage achievable with LT3585EDDB-3#TRPBF?
The LT3585EDDB-3#TRPBF does not have a fixed maximum output voltage-it is set by transformer turns ratio using the formula N = (VOUT + 2)/31.5. With appropriate transformer design (e.g., N = 10.4), LT3585EDDB-3#TRPBF reliably achieves 320V–330V outputs. Absolute maximum SW pin voltage is 60V, so reflected flyback spikes must remain ≤50V under worst-case conditions.
How does the CHRG/IADJ pin control input current in LT3585EDDB-3#TRPBF?
The CHRG/IADJ pin on LT3585EDDB-3#TRPBF provides three-state control: <0.3V disables the IC, >1.6V enables full-current mode (800mA normal / 400mA reduced), and floating between 1.1V–1.4V activates a programmable delay that reduces average input current. This allows dynamic battery-life extension without hardware changes.
Can LT3585EDDB-3#TRPBF drive IGBTs other than those listed in the datasheet?
Yes-LT3585EDDB-3#TRPBF's IGBT driver is compatible with any 400V-rated, 150A-pulsed IGBT meeting gate drive voltage (2.5–10V) and capacitance (≤4000pF) requirements. The driver pulls up to within 200mV of IGBTPWR and down to 100mV, supporting standard gate thresholds. External series resistor on IGBTPD ensures safe turn-off.
What transformer parameters are critical for stable LT3585EDDB-3#TRPBF operation?
Critical transformer parameters for LT3585EDDB-3#TRPBF include: turns ratio N = (VOUT + 2)/31.5, primary inductance ≥3.5µH, leakage inductance ≤300nH (to limit SW node spikes to <50V), and isolation voltage >500V. Recommended off-the-shelf parts include TDK LDT565630T-041 and Kijima SBL-5.6-1.
Is LT3585EDDB-3#TRPBF RoHS-compliant and lead-free?
Yes-LT3585EDDB-3#TRPBF carries the #PBF suffix, indicating it is lead-free and RoHS-compliant per EU Directive 2011/65/EU. The DFN-10 package uses matte tin (Sn) lead finish, and all materials meet Analog Devices' green packaging standards.
LT3585EDDB-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Photoflash Capacitor Charger, Xenon
- Current - Supply:
- 5mA
- Voltage - Supply:
- 1.5V ~ 16V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT3585EDDB-3#TRPBF FAQ
1.How can I place an order for LT3585EDDB-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3585EDDB-3#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 LT3585EDDB-3#TRPBF reliable?
The price and inventory of LT3585EDDB-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3585EDDB-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3585EDDB-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3585EDDB-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3585EDDB-3#TRPBF?
LT3585EDDB-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3585EDDB-3#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 LT3585EDDB-3#TRPBF?
For technical support, including LT3585EDDB-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3585EDDB-3#TRPBF requirements.
6.How does Aetrix verify that LT3585EDDB-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3585EDDB-3#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 LT3585EDDB-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3585EDDB-3#TRPBF?
All LT3585EDDB-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3585EDDB-3#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 LT3585EDDB-3#TRPBF part is unused and in its original packaging.
Return procedure for LT3585EDDB-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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