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Analog Devices Inc. LT3593ES6#TRMPBF
- Part No.:
- LT3593ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3593ES6#TRMPBF.pdf
- Description:
- IC LED DRVR RGLTR 45MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,922
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Product details
Overview
LT3593ES6#TRMPBF 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 LT3593ES6#TRMPBF datasheet, LT3593ES6#TRMPBF pinout, LT3593ES6#TRMPBF application, or LT3593ES6#TRMPBF equivalent, key selection criteria include its 32-step linear brightness control range (625μA–20mA), 1MHz fixed-frequency operation enabling <1μF output capacitance, high-side LED current sensing architecture, and TSOT-23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LT3593ES6#TRMPBF employs constant-frequency current-mode boost topology with internal 5-bit linear DAC and counter for LED current programming. Its high-side current sense eliminates need for ballast resistors and allows ground-referenced LED string termination.
It integrates open-LED protection clamping VCAP to 38V, supports shutdown via CTRL pin held low >128μs, and uses internal switch to disconnect LED string during shutdown - ensuring zero leakage current through LEDs. Switch current limit is 550–700mA with 250mV saturation voltage at 250mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-Ion cell or dual alkaline cells with external logic supply. |
| Switching Frequency | 0.85–1.15MHz - enables use of tiny 10μH inductor and 1μF ceramic output capacitor. |
| Full-Scale LED Current | 18.5–21.5mA - programmable in 625μA steps over 32 levels (20mA – (N–1)×625μA). |
| Output Current Accuracy | ±5% at full scale - ensures consistent brightness across LED strings without external calibration. |
| Shutdown Current | 3μA max - minimizes battery drain in off-state for portable applications. |
| Overvoltage Protection | 36–40V clamp - protects circuit against open-LED fault by limiting CAP pin voltage. |
| Package | 6-Lead TSOT-23 - 2.9mm × 1.6mm footprint with exposed thermal pad (GND) for power dissipation. |
Pinout & Package
LT3593ES6#TRMPBF is housed in a 6-lead plastic TSOT-23 package (2.9mm × 1.6mm × 0.9mm), with pin 1 marked by chamfer and pin 2 connected to GND. The exposed thermal pad is not electrically functional in this variant (unlike DFN version) and serves only mechanical/thermal purposes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL (Pin 1) | Current programming & shutdown control | Rising-edge strobe decrements internal 5-bit DAC; held low >128μs forces shutdown with LED disconnect. |
| GND (Pin 2) | Power and signal reference ground | Primary return path for VIN, SW, CAP, LED, and CTRL bias currents; must connect to low-impedance ground plane. |
| VIN (Pin 3) | Main input supply connection | Accepts 2.7V–5.5V; requires local 1μF X5R/X7R ceramic bypass capacitor to minimize input ripple and EMI. |
| SW (Pin 4) | Internal power switch drain node | Connects to inductor; switching node carries high di/dt - trace must be short and wide to reduce EMI and losses. |
| CAP (Pin 5) | Regulated output voltage node | Drives LED string via internal switch; connects to 1μF output capacitor; sensitive to layout-induced noise. |
| LED (Pin 6) | High-side LED current sense and connection | Top of LED string attaches here; internal switch disconnects it from CAP during shutdown; enables ground-referenced LED layout. |
Key Features
| Feature | Design Value |
|---|---|
| One-pin current programming & shutdown | CTRL pin accepts digital strobes to set 32 discrete LED currents (625μA–20mA) or enter ultra-low-power shutdown (3μA). |
| High-side LED current sensing | Enables "one-wire current source" operation - LED string low side may be grounded anywhere, simplifying PCB routing and thermal design. |
| Output disconnect in shutdown | Internal switch isolates LED pin from CAP pin, eliminating dark-current leakage and preventing unintended LED glow during sleep mode. |
| Open-LED protection | Clamps CAP voltage to 38V and reduces switching frequency to limit input current during LED string open-circuit faults. |
| 1MHz constant-frequency operation | Reduces EMI filtering requirements and allows miniature passive components - 10μH inductor + 1μF ceramic capacitor suffice for most designs. |
Applications
| Cell Phones | Digital Cameras |
|---|---|
Use Scenario: Backlighting for small OLED or TFT LCD displays in slim smartphones with single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Constant-current boost controller providing regulated 20mA drive to 6–10-series white LEDs. Use Value: Enables uniform brightness, 32-step dimming via single GPIO, and zero LED current in standby - extending battery life by >20% vs. resistor-based solutions. |
Use Scenario: Flash-assisted autofocus illumination and rear-panel display backlight in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency LED driver supporting rapid on/off sequencing and analog dimming via CTRL pin strobing. Use Value: Delivers >80% efficiency at 15mA/3.6V input, minimizing heat in sealed camera housing while maintaining precise current regulation across temperature. |
| PDA / Handheld Computers | GPS Receivers |
Use Scenario: Backlight for monochrome or color LCDs in industrial PDAs operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Temperature-stable LED current source with ±5% accuracy maintained over full junction range. Use Value: Eliminates brightness drift during outdoor operation; TSOT-23 package withstands thermal cycling without solder fatigue. |
Use Scenario: Status indicator and map-display backlight in automotive-grade GPS units powered by 3.3V system rail. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency boost converter synchronized to system clock to avoid RF interference with GPS L1 band. Use Value: 1MHz switching avoids critical 1.575GHz GPS band harmonics; 3μA shutdown current preserves battery during vehicle ignition-off periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3465ES6#TRMPBF | Higher VIN range (2.7V–16V); integrated Schottky diode; no output disconnect in shutdown. | Lacks LED pin disconnect - unsuitable where zero dark current is mandatory; better for wide-input industrial lighting. | Choose LT3465ES6#TRMPBF only if input exceeds 5.5V or integrated diode simplifies BOM; otherwise LT3593ES6#TRMPBF preferred for portable shutdown integrity. |
| LT3591EDCB#TRMPBF | Same 10-LED capability but in 3mm × 2mm DFN; higher quiescent current (4mA vs. 300μA active); no CTRL-programmable dimming. | Fixed-current output only; requires external PWM or analog dimming; larger footprint than TSOT-23. | Select LT3591EDCB#TRMPBF when board space permits larger package and simpler fixed-brightness design suffices; avoid when programmable dimming or minimal active current is required. |
Compared with LT3465ES6#TRMPBF and LT3591EDCB#TRMPBF, the LT3593ES6#TRMPBF uniquely combines one-pin programmable dimming, true output disconnect, and ultra-low shutdown current in the smallest possible TSOT-23 footprint - making it optimal for battery-sensitive handheld UI backlighting where firmware-controlled brightness and zero standby leakage are essential.
Availability
LT3593ES6#TRMPBF is available at Aetrix Electronics and suitable for cell phones, digital cameras, PDAs, GPS receivers, and MP3 players requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LT3593ES6#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 products, including robust quality systems and military-grade reliability testing.
The LT3593ES6#TRMPBF belongs to Linear's precision LED driver product line, engineered specifically for space-constrained portable electronics requiring high-efficiency, digitally programmable backlighting with minimal external components.
FAQ
What is the maximum number of white LEDs the LT3593ES6#TRMPBF can drive?
The LT3593ES6#TRMPBF is specified to drive up to ten white LEDs in series from a 3.6V input, assuming typical forward voltage of 3.2V per LED (32V total). Its 38V overvoltage clamp and 45mA LED current limit ensure safe operation within this configuration. Driving more than ten LEDs risks exceeding the clamp voltage or violating current limits, so the LT3593ES6#TRMPBF should not be used beyond its validated 10-LED capacity.
How does the CTRL pin programming work on the LT3593ES6#TRMPBF?
The CTRL pin on the LT3593ES6#TRMPBF accepts rising-edge pulses to decrement an internal 5-bit DAC: each pulse reduces LED current by 625μA, starting from 20mA. After the final pulse, the LT3593ES6#TRMPBF waits 128μs before applying the new value. Holding CTRL low >128μs places the LT3593ES6#TRMPBF into shutdown, disconnecting the LED string. No external components are needed - timing is fully internal.
Does the LT3593ES6#TRMPBF require an external Schottky diode?
Yes, the LT3593ES6#TRMPBF requires an external Schottky diode connected between SW and CAP pins. Unlike some newer LED drivers, the LT3593ES6#TRMPBF does not integrate a diode. Recommended parts include CMDSH05-4 or PMEG4005AEA - selected for low forward voltage (<0.5V at 500mA) and low capacitance (<50pF) to maintain efficiency at 1MHz switching.
What is the thermal performance of the LT3593ES6#TRMPBF in TSOT-23 package?
The LT3593ES6#TRMPBF in TSOT-23 has θJA = 192°C/W. At 20mA LED current and 3.6V input, typical power dissipation is ~120mW, resulting in ~23°C junction rise above ambient. For continuous full-load operation, keep ambient below 65°C or add copper pour under pin 2 (GND) to improve heat spreading. Derate output current above 85°C ambient per datasheet curves.
Can the LT3593ES6#TRMPBF operate from two AA batteries?
Yes - the LT3593ES6#TRMPBF operates down to 2.7V, matching the discharge curve of two fresh alkaline AAs (3.2V) through end-of-life (~2.8V). For optimal efficiency, power the LT3593ES6#TRMPBF's VIN from a 3.3V logic rail while connecting the inductor to the battery directly, as shown in Figure 6 of the datasheet. This preserves battery energy for the LEDs while stabilizing IC operation.
LT3593ES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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:
- TSOT-23-6
LT3593ES6#TRMPBF FAQ
1.How can I place an order for LT3593ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3593ES6#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 LT3593ES6#TRMPBF reliable?
The price and inventory of LT3593ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3593ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3593ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3593ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3593ES6#TRMPBF?
LT3593ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3593ES6#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 LT3593ES6#TRMPBF?
For technical support, including LT3593ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3593ES6#TRMPBF requirements.
6.How does Aetrix verify that LT3593ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3593ES6#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 LT3593ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3593ES6#TRMPBF?
All LT3593ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3593ES6#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 LT3593ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT3593ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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