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Analog Devices Inc. LT3593EDC#TRPBF
- Part No.:
- LT3593EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3593EDC#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 45MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,201
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Product details
Overview
LT3593EDC#TRPBF from Analog Devices (formerly Linear Technology) is a 1MHz step-up DC/DC converter IC designed as a constant-current white LED driver for portable displays. It drives up to ten series-connected white LEDs from a 2.7V–5.5V input, features one-pin current programming via CTRL strobing, delivers ±5% output current accuracy at full scale, and provides output disconnect during shutdown. It is used in Li-ion–powered handheld devices requiring compact, efficient backlighting.
For engineers reviewing the LT3593EDC#TRPBF datasheet, LT3593EDC#TRPBF pinout, LT3593EDC#TRPBF application, or LT3593EDC#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world efficiency behavior across LED counts, confirmed alternative drivers with documented functional trade-offs, and supply-chain support for volume production of mobile display power stages.
Technical Context
The LT3593EDC#TRPBF implements constant-frequency (1MHz), current-mode boost regulation with internal high-side LED current sensing-enabling true "one-wire current source" operation where the LED string low side may be grounded anywhere. Its integrated 5-bit linear DAC and counter allow 32-step (625μA increments) LED current programming via rising-edge strobes on the CTRL pin, with 128μs latency before new current takes effect.
It includes open-LED protection clamping VCAP at 38V, shutdown current of 3μA, and an internal switch that disconnects the LED pin from CAP during shutdown-eliminating leakage through the LED string. The device operates across –40°C to +85°C and supports stable regulation with only 1μF output capacitance due to its fixed-frequency architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz (typ); enables use of tiny 10μH inductors and 1μF ceramic capacitors, minimizing board area and EMI filtering complexity. |
| Input Voltage Range | 2.7V to 5.5V; compatible with single Li-ion (3.0–4.2V), two alkaline cells (2.0–3.2V with auxiliary logic rail), or 3.3V system rails. |
| Full-Scale LED Current | 20mA (typ); programmable down to 625μA in 32 linear steps-supports precise brightness control without external DAC or PWM. |
| Output Current Accuracy | ±5% at full scale; ensures consistent luminance across units and temperature without factory calibration. |
| Shutdown Current | 3μA (max); preserves battery life in always-on portable devices during display-off states. |
| Overvoltage Clamp | 38V (typ); protects downstream components during LED open-circuit failure and enables safe hot-plug detection. |
| Package | 6-lead DFN (2mm × 2mm × 0.75mm); exposes thermal pad (Pin 7) for direct PCB soldering-critical for thermal management at 700mA switch current limit. |
Pinout & Package
LT3593EDC#TRPBF is housed in a 6-lead plastic DFN package (2mm × 2mm, 0.75mm height) with exposed thermal pad (Pin 7) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL (Pin 3) | Current programming & shutdown control | Rising-edge strobes decrement internal 5-bit DAC; held low >128μs triggers shutdown-no external logic required for enable/disable or dimming. |
| GND (Pin 2) | Power and signal reference ground | Primary return path for VIN, SW, CAP, LED, and CTRL; must connect directly to low-impedance ground plane to stabilize regulation and minimize noise coupling. |
| VIN (Pin 1) | Main power input | Supplies internal circuitry and boost inductor; requires local 1μF X5R/X7R ceramic bypass capacitor placed adjacent to pin to suppress switching transients. |
| LED (Pin 4) | High-side LED string connection | Internally switched to CAP during operation; disconnected in shutdown-ensures zero LED current and eliminates need for external blocking FET. |
| CAP (Pin 5) | Boost output / feedback node | Connects to output capacitor and LED string anode; voltage sensed here regulates LED current; trace length must be minimized to reduce EMI and improve stability. |
| SW (Pin 6) | Internal power switch drain | Drives external inductor; high di/dt node-requires short, wide trace to VIN and minimal loop area to contain radiated emissions. |
| Exposed Pad (Pin 7) | Thermal & electrical ground | Not optional: must be soldered to solid copper pour tied to GND; failure to do so causes thermal shutdown or reduced current capability. |
Key Features
| Feature | Design Value |
|---|---|
| One-pin current programming | Eliminates external resistors, DACs, or PWM generators-brightness controlled solely by digital strobes on CTRL, reducing BOM count and layout space. |
| Output disconnect in shutdown | Active internal switch isolates LED string from CAP, guaranteeing zero standby current through LEDs-critical for battery runtime in handhelds. |
| High-side current sense architecture | Allows LED cathodes to be grounded anywhere-simplifies mechanical design, avoids floating grounds, and enables shared ground with host processor or touchscreen controller. |
| 1MHz fixed-frequency operation | Enables use of miniature 10μH inductors and 1μF ceramic capacitors-reducing solution size by >40% vs. lower-frequency boost converters. |
| Open-LED overvoltage protection | Clamps VCAP at 38V and reduces switching frequency to limit input current-prevents damage to IC or external components during LED string failure. |
Applications
| Cell Phones | Digital Cameras |
|---|---|
Use Scenario: Backlighting for 3.5″–5″ AMOLED or TFT LCD displays powered by single Li-ion cell. IC Role / Device Role / Timing Role: Constant-current boost regulator delivering 20mA per LED across 6–10-series strings; regulates current independent of forward voltage drift. Use Value: Maintains uniform brightness across display lifetime and temperature range while consuming <300μA quiescent current during active dimming sequences. |
Use Scenario: Flash illumination and rear-panel LCD backlight in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Dual-role driver-supplies steady 15mA to 4-white-LED display backlight, then pulses same string at 20mA for flash assist mode using CTRL reprogramming. Use Value: Eliminates need for separate flash LED driver IC; achieves <90% efficiency at 10mA load with 1μF output cap-reducing component count and PCB area. |
| PDA / Handheld Computers | GPS Receivers |
Use Scenario: High-brightness outdoor-readable display backlight in ruggedized industrial PDAs operating from 3.3V logic rail and 3.6V battery. IC Role / Device Role / Timing Role: Regulates 18mA LED current across 8-series string; uses CTRL pin to dynamically scale brightness based on ambient light sensor output. Use Value: Achieves 32:1 linear dimming range without color shift; maintains ±5% current accuracy from –40°C to +85°C-ensuring readability in extreme environments. |
Use Scenario: Low-power, always-on GPS navigation units with monochrome or small-color LCD requiring minimal standby drain. IC Role / Device Role / Timing Role: Powers 3-white-LED backlight from 2xAA alkaline cells (2.0–3.2V) while drawing only 3μA in shutdown-extending battery life beyond 12 months. Use Value: Enables direct battery connection to inductor while powering IC from 3.3V logic rail-boosting efficiency by 8% vs. single-rail solutions and eliminating LDO overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3591EDC#TRPBF | Includes integrated Schottky diode; higher quiescent current (4mA vs. 300μA); same 1MHz switching and 20mA full-scale current. | Better suited for space-constrained designs where external diode placement is impractical; less optimal for ultra-low-IQ battery applications. | Select LT3591EDC#TRPBF when board area is critical and IQ >300μA is acceptable; avoid if shutdown current <5μA is mandatory. |
| LT1932ES6#TRPBF | Higher switching frequency (1.2MHz); supports only up to 8 LEDs; lower max output voltage (34V vs. 45V); no output disconnect in shutdown. | Limited to smaller LED strings; requires external MOSFET or diode for shutdown isolation; better for cost-sensitive, lower-performance displays. | Choose LT1932ES6#TRPBF for 4–8 LED strings where 38V OVP and zero-standby LED current are not required; verify external isolation if needed. |
Compared with LT3593EDC#TRPBF, LT3591EDC#TRPBF trades integrated diode convenience for higher quiescent current, while LT1932ES6#TRPBF offers higher frequency but sacrifices output disconnect and open-LED protection-making LT3593EDC#TRPBF the only option supporting ten LEDs with guaranteed zero-LED-leakage shutdown and 38V fault clamping.
Availability
LT3593EDC#TRPBF is available at Aetrix Electronics and suitable for cell phones, digital cameras, PDAs, GPS receivers, and MP3 players requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for LT3593EDC#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 full product support, documentation, and manufacturing continuity for all Linear ICs including the LT3593 family.
The LT3593 product line was engineered specifically for compact, high-efficiency white LED backlighting in battery-powered portable electronics-prioritizing low IQ, single-pin dimming, and robust fault protection over general-purpose DC/DC functionality.
FAQ
What is the maximum number of white LEDs the LT3593EDC#TRPBF can drive?
The LT3593EDC#TRPBF is specified to drive up to ten white LEDs in series from a Li-ion cell. This assumes typical forward voltage of ~3.2V per LED at 20mA, resulting in ~32V total VF, which remains within the device's 45V absolute maximum LED pin rating and 38V overvoltage clamp threshold. Driving more than ten LEDs risks exceeding safe operating limits under temperature or process variation.
How does the CTRL pin programming work on the LT3593EDC#TRPBF?
The CTRL pin on the LT3593EDC#TRPBF accepts rising-edge strobes to decrement an internal 5-bit counter, each reducing LED current by 625μA from 20mA full scale. After the final strobe, the part waits 128μs (typ) before applying the new current value. Holding CTRL low for >128μs forces shutdown. The LT3593EDC#TRPBF retains its programmed current setting across power cycles if the CTRL pin is left floating or pulled high after configuration.
Does the LT3593EDC#TRPBF require an external Schottky diode?
Yes, the LT3593EDC#TRPBF requires an external Schottky diode-unlike some newer Linear/Analog Devices LED drivers (e.g., LT3591). The recommended part is CMDSH05-4 (Central Semiconductor), rated for 500mA with 0.47V forward drop at 500mA and 50pF capacitance. This diode selection balances conduction loss and switching loss at the device's 1MHz switching frequency.
What is the purpose of the exposed pad on the LT3593EDC#TRPBF DFN package?
The exposed pad (Pin 7) on the LT3593EDC#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour tied to the main ground plane to ensure proper thermal dissipation-especially critical during 700mA peak switch current operation-and to maintain stable regulation. Leaving it unconnected degrades thermal performance and may trigger thermal shutdown under load.
Can the LT3593EDC#TRPBF operate from two AA alkaline cells?
Yes, the LT3593EDC#TRPBF supports input voltages from 2.7V to 5.5V, making it compatible with two fresh AA alkaline cells (nominal 3.0V, range 3.2V down to ~2.0V). For reliable operation below 2.7V, the recommended approach is to power the LT3593EDC#TRPBF's VIN from a stable 3.3V logic rail while connecting the inductor to the raw battery-enabling operation down to ~2.0V without violating the IC's minimum input specification.
LT3593EDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 45mA
- Frequency:
- 1MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LT3593EDC#TRPBF FAQ
1.How can I place an order for LT3593EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3593EDC#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 LT3593EDC#TRPBF reliable?
The price and inventory of LT3593EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3593EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3593EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3593EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3593EDC#TRPBF?
LT3593EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3593EDC#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 LT3593EDC#TRPBF?
For technical support, including LT3593EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3593EDC#TRPBF requirements.
6.How does Aetrix verify that LT3593EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3593EDC#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 LT3593EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3593EDC#TRPBF?
All LT3593EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3593EDC#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 LT3593EDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3593EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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