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Analog Devices Inc. LT3468ES5#TRMPBF
- Part No.:
- LT3468ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT3468ES5#TRMPBF.pdf
- Description:
- IC PHOTOFLASH CAP CHRGR TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:880
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Product details
Overview
LT3468ES5#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic photoflash capacitor charger IC with integrated 1.4A NPN power switch, designed for high-efficiency step-up charging of camera flash capacitors up to 320V. It operates from 2.5V–16V input, delivers 500mA max input current, and achieves 4.6s charge time (0V→320V, 100µF, VIN=3.6V) using compact 5.8mm×5.8mm×3mm transformers in digital/film camera flash systems.
For engineers reviewing the LT3468ES5#TRMPBF datasheet, LT3468ES5#TRMPBF pinout, LT3468ES5#TRMPBF application, or LT3468ES5#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed photoflash-specific performance metrics, and real-world alternative selection guidance - all grounded in the official LT3468 family datasheet and Linear Technology application documentation.
Technical Context
The LT3468ES5#TRMPBF implements a patented flyback-based photoflash charging architecture with on-chip output voltage detection via SW-pin flyback waveform monitoring (trip at 31.5V above VIN), eliminating external zener diodes or resistor dividers. Its internal 1.4A peak switch current limit enables precise control of input current (500mA typ.) and fast charge cycles without external current-sense resistors.
It features dual comparator-based control: a DCM comparator (36mV threshold) manages discontinuous conduction mode timing, while the VOUT comparator (31.5V ±0.5V trip) terminates charging when target voltage is reached. The CHARGE pin provides full-cycle enable/disable control, and the open-collector DONE pin signals completion with NPN sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single Li-ion cell (2.7–4.2V) and wide-input portable systems without external regulation. |
| Switch Current Limit | 1.2A typical (1.1–1.3A) - sets maximum primary current, directly determining input current (500mA) and transformer stress. |
| VOUT Detection Threshold | 31.5V ±0.5V above VIN - enables accurate, resistor-free output voltage setting via transformer turns ratio (N = (VOUT + 2)/31.5). |
| Charge Time | 4.6s (0V→320V, 100µF, VIN=3.6V) - verified timing for full photoflash capacitor charging under standard test conditions. |
| Package | SOT-23-5 (TSOT-23) - low-profile (1mm height), 5-pin plastic package optimized for space-constrained camera modules. |
| Operating Temperature | –40°C to 85°C - specified industrial-grade range ensuring reliability in handheld consumer electronics environments. |
| SW Pin Absolute Max | –0.4V to 50V - defines clamp diode requirement (e.g., ZHCS400) to prevent negative swing and overvoltage during flyback. |
Pinout & Package
LT3468ES5#TRMPBF is housed in a 5-lead plastic TSOT-23 package (JEDEC MO-193), measuring 2.90mm × 1.60mm × 0.95mm with 0.95mm body height and 0.65mm pitch. The package is lead-free, RoHS-compliant, and rated for reflow soldering (260°C, 10 sec).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN power switch | Connects to transformer primary; carries high di/dt switching current - requires minimal trace area to reduce EMI. |
| GND (Pin 2) | Power and signal ground reference | Must tie directly to local ground plane; serves as return path for switch current and comparator references. |
| DONE (Pin 3) | Open-collector NPN output indicator | Sinks current when target VOUT is reached; requires external pull-up to VIN for logic-level signaling. |
| CHARGE (Pin 4) | Enable/control input | High (>1V) enables charging; low (<0.3V) forces shutdown; toggling restarts cycle - enables precise user timing control. |
| VIN (Pin 5) | Main power supply input | Accepts 2.5–16V; must be bypassed locally with ≥4.7µF X5R/X7R ceramic capacitor to suppress input ripple and noise. |
Key Features
| Feature | Design Value |
|---|---|
| No external voltage divider required | On-chip VOUT comparator monitors reflected flyback voltage on SW pin - eliminates zener diodes and resistor networks, reducing BOM count and layout area. |
| Transformer size reduction | Patented control allows use of 5.8mm × 5.8mm × 3mm transformers - enables ultra-thin camera module designs without sacrificing charge speed or efficiency. |
| Controlled input current | Fixed 500mA max input current (typ.) - ensures predictable battery drain and thermal behavior in Li-ion-powered devices. |
| Full-cycle user control | CHARGE pin enables start/stop/halt/restart of charging - supports burst-mode operation, safety interlocks, and system-level power sequencing. |
| Output voltage programmability | Adjustable via transformer turns ratio only - no trimming components needed; supports 200–350V range with <±1% variation across temperature. |
Applications
| Digital Camera Flash | Film Camera Flash |
|---|---|
Use Scenario: Charging 100µF photoflash capacitor to 320V in sub-5s for DSLR or mirrorless camera strobes. IC Role / Device Role / Timing Role: Primary high-voltage DC-DC charger IC managing flyback energy transfer, voltage regulation, and cycle termination. Use Value: Enables compact, low-profile flash modules with consistent 4.6s charge time and no external feedback components. |
Use Scenario: Replacing xenon tube drivers in legacy film cameras with modern, efficient solid-state charging. IC Role / Device Role / Timing Role: Standalone photoflash capacitor charger delivering precise 320V output with DONE pin confirmation. Use Value: Eliminates discrete transistor arrays and zener networks, reducing component count by >6 parts per channel. |
| PDA / Smartphone Flash | Emergency Strobe Light |
Use Scenario: Integrating auxiliary flash into thin PDA or early smartphone form factors with 3.6V Li-ion supply. IC Role / Device Role / Timing Role: Input-current-limited (500mA) photoflash charger operating from single-cell battery with minimal PCB footprint. Use Value: Achieves 4.6s full charge while limiting peak input current to preserve battery life and avoid voltage sag. |
Use Scenario: Powering high-intensity emergency strobes requiring rapid, repeatable 300–320V capacitor charging. IC Role / Device Role / Timing Role: Robust, temperature-stable photoflash charger with –40°C to 85°C operation and DONE pin synchronization. Use Value: Guarantees reliable flash triggering under extreme ambient conditions with no calibration or trimming required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar photoflash capacitor charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3420ES6#TRMPBF | Higher 1.4A switch current (same as LT3468), but includes automatic top-off and lower quiescent current (90µA vs 8mA). | Designed for higher-capacitance loads (220µF → 320V in 3.7s); lacks CHARGE pin direct halt capability. | Select LT3420ES6#TRMPBF when top-off functionality and faster charge of larger capacitors are required; not drop-in due to different pinout and control logic. |
| LT3468ES5-1#TRMPBF | Lower 0.55A switch current limit (vs 1.2A), resulting in 225mA max input current and slower charge time (5.5s for 50µF @ 320V). | Optimized for ultra-low-power flash systems with smaller transformers (e.g., 5.8mm × 5.8mm × 3mm, LPRI = 14.5µH). | Select LT3468ES5-1#TRMPBF when battery life is prioritized over speed and transformer size must be minimized - same pinout, but not functionally interchangeable. |
Compared with LT3468ES5#TRMPBF, LT3420ES6#TRMPBF offers faster charging for larger capacitors but removes user-controlled CHARGE pin halt; LT3468ES5-1#TRMPBF shares identical pinout and topology but trades speed for lower input current and smaller magnetics - both require schematic and transformer redesign for substitution.
Availability
LT3468ES5#TRMPBF is available at Aetrix Electronics and suitable for digital camera flash, film camera flash, and emergency strobe lighting applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LT3468ES5#TRMPBF 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 full product support, datasheet archives, and application engineering resources for legacy Linear parts including the LT3468 family.
The LT3468 series was developed specifically for photoflash capacitor charging in portable imaging devices, emphasizing minimal external components, transformer size reduction, and precise high-voltage output control without feedback resistors.
FAQ
What is the maximum output voltage achievable with LT3468ES5#TRMPBF?
The LT3468ES5#TRMPBF does not have a fixed maximum output voltage. Output is set by transformer turns ratio using N = (VOUT + 2)/31.5. With standard 10.2:1 transformers, it reliably achieves 320V. Higher ratios (e.g., 12:1) support up to ~350V, constrained by transformer isolation rating (>500V) and SW pin voltage limits (≤50V).
Does LT3468ES5#TRMPBF require an external current-sense resistor?
No, LT3468ES5#TRMPBF does not require an external current-sense resistor. Its peak switch current is internally limited to 1.2A (typ.), and input current is inherently controlled by this limit and transformer design. The datasheet confirms RSENSE = 0Ω for LT3468 variants, distinguishing it from current-mode controllers needing external sensing.
Can LT3468ES5#TRMPBF operate from a 2.5V supply?
Yes, LT3468ES5#TRMPBF is fully specified to operate from 2.5V to 16V input. At 2.5V, charge time increases (e.g., ~7.2s for 100µF→320V), but functionality remains intact. The device's low dropout and optimized gate drive ensure reliable startup and switching down to the absolute minimum VIN.
What is the purpose of the Schottky diode from GND to SW in LT3468ES5#TRMPBF circuits?
The Schottky diode (e.g., ZHCS400) from GND to SW in LT3468ES5#TRMPBF circuits clamps negative voltage excursions on the SW pin during flyback transitions. This prevents the SW node from falling below –0.4V (absolute min), protects the internal NPN switch, and ensures proper DCM comparator operation - it is mandatory for reliable function per the datasheet.
How does the DONE pin signal charging completion in LT3468ES5#TRMPBF?
The DONE pin in LT3468ES5#TRMPBF is an open-collector NPN output that sinks current when the VOUT comparator detects the target voltage (31.5V above VIN). When active, it pulls low (≤200mV at 33µA sink); when inactive, it floats high. An external pull-up resistor to VIN is required to generate a clean logic-high signal indicating charging is complete.
LT3468ES5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Photoflash Capacitor Charger
- Current - Supply:
- 5mA
- Voltage - Supply:
- 2.5V ~ 16V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT3468ES5#TRMPBF FAQ
1.How can I place an order for LT3468ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3468ES5#TRMPBF 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 LT3468ES5#TRMPBF reliable?
The price and inventory of LT3468ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3468ES5#TRMPBF is usually 5 days.
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Once your LT3468ES5#TRMPBF 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 LT3468ES5#TRMPBF?
For technical support, including LT3468ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3468ES5#TRMPBF requirements.
6.How does Aetrix verify that LT3468ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3468ES5#TRMPBF 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 LT3468ES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3468ES5#TRMPBF?
All LT3468ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3468ES5#TRMPBF, 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 LT3468ES5#TRMPBF part is unused and in its original packaging.
Return procedure for LT3468ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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