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Analog Devices Inc. LT3468ES5-2#TRMPBF
- Part No.:
- LT3468ES5-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT3468ES5-2#TRMPBF.pdf
- Description:
- IC PHOTOFLASH CAP CHRGR TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
LT3468ES5-2#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic photoflash capacitor charger IC with integrated 1A NPN power switch, designed for compact digital camera and PDA flash systems. It delivers controlled 375mA input current, charges a 100µF capacitor to 320V in 5.7s from 3.6V input, and operates from 2.5V to 16V supply. Its patented flyback control eliminates external zener diodes and enables use of ultra-small 5.8mm × 5.8mm × 3mm transformers.
For engineers reviewing the LT3468ES5-2#TRMPBF datasheet, LT3468ES5-2#TRMPBF pinout, LT3468ES5-2#TRMPBF application, or LT3468ES5-2#TRMPBF equivalent, key selection criteria include verified 1A switch current limit, 31.5V output voltage detection threshold referenced to VIN, SOT-23 package thermal resistance (θJA = 150°C/W), and confirmed compatibility with 10.2:1 transformer turns ratio for 320V output.
Technical Context
The LT3468ES5-2#TRMPBF implements a fixed-frequency discontinuous conduction mode (DCM) flyback controller with internal NPN switch and on-chip VOUT comparator. Output voltage is sensed indirectly via reflected flyback voltage at the SW pin, triggering shutdown when VSW – VVIN reaches 31.5V ±0.5V.
It features a dedicated CHARGE enable pin (logic-high >1V, logic-low <0.3V) and open-collector DONE pin that pulls low upon target voltage achievement. Switch current limit is factory-trimmed to 0.77–0.97A (typ. 0.87A), resulting in tightly regulated 375mA average input current at 3.6V input and 100µF/320V output conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single Li-ion cell (3.0–4.2V) and wide-input portable systems without external regulation. |
| Switch Current Limit | 0.77–0.97A (typ. 0.87A) - sets maximum primary current, enabling precise 375mA input current control at 3.6V. |
| VOUT Detection Threshold | 31.5V ±0.5V above VIN - determines final output voltage via transformer turns ratio (N = (VOUT + 2)/31.5). |
| Quiescent Current | 5–8mA (not switching) - defines standby power loss during idle periods before flash activation. |
| Operating Temperature | –40°C to +85°C - qualified for consumer and industrial portable electronics environments. |
| Package Thermal Resistance | θJA = 150°C/W - requires minimal PCB copper area for thermal management in thin SOT-23 layout. |
Pinout & Package
LT3468ES5-2#TRMPBF is housed in a 5-lead TSOT-23 (S5) package, 1.0mm profile, JEDEC MO-193 compliant. Pin 1 (SW) connects to transformer primary; Pin 2 (GND) is local ground reference; Pin 3 (DONE) is open-collector NPN output; Pin 4 (CHARGE) is active-high enable; Pin 5 (VIN) accepts input supply.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN power switch | Drives transformer primary; must be routed with minimal trace area to reduce EMI; requires Schottky clamp diode to GND. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane; serves as return path for switch current and feedback references. |
| DONE (Pin 3) | Open-collector NPN output | Pulls low when target output voltage reached; requires external pull-up resistor (e.g., 100kΩ to VIN) for logic-level indication. |
| CHARGE (Pin 4) | Enable/control input | High (>1V) initiates charging; low (<0.3V) forces shutdown; toggling restarts charge cycle without reset. |
| VIN (Pin 5) | Main power input | Accepts 2.5–16V; must be bypassed locally with ≥4.7µF X5R/X7R ceramic capacitor to suppress high-frequency ripple. |
Key Features
| Feature | Design Value |
|---|---|
| No external voltage divider required | On-chip VOUT comparator senses reflected flyback voltage at SW pin, eliminating zener diodes and resistive dividers. |
| Transformer size reduction | Patented control allows use of 5.8mm × 5.8mm × 3mm transformers - reduces board area by >40% vs. legacy photoflash chargers. |
| Controlled input current | Factory-trimmed 1A switch limit ensures stable 375mA average input current at 3.6V, extending battery life in portable devices. |
| Full system control interface | Dedicated CHARGE pin enables precise timing of flash charge initiation; DONE pin provides hardware-ready signal for microcontroller synchronization. |
| Robust high-voltage operation | SW pin rated to 50V with –0.4V negative swing tolerance; requires Schottky clamp diode to prevent sub-ground excursions during flyback. |
Applications
| Digital Camera Flash | PDA / Smartphone Flash |
|---|---|
Use Scenario: Charging 100µF photoflash capacitor to 320V in under 6 seconds from a 3.6V Li-ion battery in compact digital cameras. IC Role / Device Role / Timing Role: Primary flyback controller with integrated switch, voltage sensing, and charge-complete signaling. Use Value: Enables rapid flash readiness while maintaining strict 375mA input current limit to avoid battery sag and system brownout. |
Use Scenario: Integrating photoflash capability into space-constrained handheld devices with shared 3.3V/3.6V power rail. IC Role / Device Role / Timing Role: Standalone flash charger managing transformer primary drive, output voltage regulation, and DONE flag generation. Use Value: Eliminates need for external feedback components and supports 3mm-profile transformers for <1mm Z-height designs. |
| Emergency Strobe Light | Portable Medical Imaging Flash |
Use Scenario: Driving high-intensity strobe output in battery-powered emergency lighting units requiring repeatable 320V pulses. IC Role / Device Role / Timing Role: Precision-controlled energy delivery circuit with deterministic charge time and overvoltage protection. Use Value: Guarantees consistent flash intensity across temperature (–40°C to +85°C) due to stable 31.5V VOUT trip point. |
Use Scenario: Powering xenon flash tubes in portable diagnostic imaging tools where EMI and size are critical constraints. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter generating isolated high-voltage output with minimal radiated emissions. Use Value: Low-profile SOT-23 package and optimized transformer interface reduce total solution height to ≤3mm, meeting handheld ergonomics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar photoflash capacitor charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3468ES5#TRMPBF | 1.4A switch limit; 500mA input current; faster 4.6s charge time for 100µF/320V at 3.6V | Better suited for high-power flash systems requiring minimum charge latency | Select when peak input current budget allows >375mA and fastest possible flash readiness is required |
| LT3468ES5-1#TRMPBF | 0.7A switch limit; 225mA input current; slower 5.5s charge time for 50µF/320V at 3.6V | Optimized for ultra-low-power devices with tight battery current limits | Select when minimizing average input current is prioritized over charge speed, e.g., coin-cell–powered accessories |
Compared with LT3468ES5#TRMPBF and LT3468ES5-1#TRMPBF, the LT3468ES5-2#TRMPBF offers balanced performance: 375mA input current enables reliable 320V charging of 100µF capacitors in 5.7s while staying within typical smartphone battery discharge limits - making it the preferred choice for mainstream mobile flash subsystems.
Availability
LT3468ES5-2#TRMPBF is available at Aetrix Electronics and suitable for digital camera flash modules, PDA strobe circuits, and portable medical imaging devices requiring stable component supply and long-term production continuity.
Supply support for LT3468ES5-2#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 technical and manufacturing continuity for all Linear product lines, including precision analog and power management ICs.
The LT3468 family was developed by Linear Technology specifically for miniaturized photoflash capacitor charging in battery-powered imaging devices, emphasizing transformer size reduction, input current control, and integration of voltage sensing.
FAQ
What is the exact switch current limit specification for LT3468ES5-2#TRMPBF?
The LT3468ES5-2#TRMPBF has a guaranteed switch current limit of 0.77A (min), 0.87A (typ), and 0.97A (max) across temperature. This factory-trimmed limit directly determines its 375mA average input current at 3.6V input and 100µF/320V output conditions, as confirmed in the Electrical Characteristics table on page 2 of the official datasheet.
How does LT3468ES5-2#TRMPBF detect output voltage without external resistors?
The LT3468ES5-2#TRMPBF detects output voltage by monitoring the reflected flyback voltage at the SW pin. When VSW – VVIN reaches 31.5V ±0.5V, the internal VOUT comparator triggers shutdown. This eliminates the need for external zener diodes or resistor dividers, as stated in the "Description" section and verified in Figure 1's block diagram and the "Output Voltage Detection" subsection on page 7.
Which transformer turns ratio is required for 320V output with LT3468ES5-2#TRMPBF?
For 320V output, LT3468ES5-2#TRMPBF requires a transformer turns ratio N = (VOUT + 2) / 31.5 = 322 / 31.5 ≈ 10.2, as explicitly defined in the "Transformer Design" section (page 7) and used in all reference designs (Figures 6–8). This ratio is validated for TDK LDT565630T-003 and Kijima SBL-5.6-1 transformers.
What is the recommended clamp diode for the SW pin of LT3468ES5-2#TRMPBF?
The recommended SW pin clamp diode for LT3468ES5-2#TRMPBF is the Zetex ZHCS400 Schottky diode (40V reverse rating, 500mA peak forward current), specified in Table 4 (page 10) and used in Figure 6's reference design. It prevents the SW node from falling below ground during flyback transitions and is mandatory for proper operation.
Does LT3468ES5-2#TRMPBF support charging capacitors larger than 100µF?
Yes - the LT3468ES5-2#TRMPBF datasheet explicitly states "Charges Any Size Photoflash Capacitor" in the FEATURES section (page 1). Charge time scales linearly with capacitance; for example, charging 200µF to 320V takes ~11.4s at 3.6V input, as derived from the charge-time curves in Figures G04–G06 and confirmed in the "Photoflash Capacitor Chargers" description.
LT3468ES5-2#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
LT3468ES5-2#TRMPBF FAQ
1.How can I place an order for LT3468ES5-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3468ES5-2#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 LT3468ES5-2#TRMPBF reliable?
The price and inventory of LT3468ES5-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3468ES5-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3468ES5-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3468ES5-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3468ES5-2#TRMPBF?
LT3468ES5-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3468ES5-2#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 LT3468ES5-2#TRMPBF?
For technical support, including LT3468ES5-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3468ES5-2#TRMPBF requirements.
6.How does Aetrix verify that LT3468ES5-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3468ES5-2#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 LT3468ES5-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3468ES5-2#TRMPBF?
All LT3468ES5-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3468ES5-2#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 LT3468ES5-2#TRMPBF part is unused and in its original packaging.
Return procedure for LT3468ES5-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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