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Analog Devices Inc. LT3593ES6#TRPBF
- Part No.:
- LT3593ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3593ES6#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR 45MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,273
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Product details
Overview
LT3593ES6#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, provides output disconnect in shutdown, and delivers ±5% LED current accuracy at full scale. It is used in compact handheld devices requiring precise brightness control and low quiescent power.
For engineers reviewing the LT3593ES6#TRPBF datasheet, LT3593ES6#TRPBF pinout, LT3593ES6#TRPBF application, or LT3593ES6#TRPBF equivalent, this page details its high-side current sensing architecture, 32-step linear dimming (625μA–20mA), 1MHz fixed-frequency operation enabling <1μF output capacitance, shutdown current of 3μA, and TSOT-23-6 package compatibility with space-constrained Li-ion-powered designs.
Technical Context
The LT3593ES6#TRPBF employs constant-frequency current-mode boost control with internal 5-bit linear DAC and counter for LED current programming. Its high-side current sense circuit enables ground-referenced LED strings without ballast resistors, eliminating mismatch-induced brightness variation across LEDs.
It integrates open-LED protection clamping VCAP at 38V, supports programmable shutdown via CTRL pin hold-low (>128μs), and uses an internal switch to disconnect the LED string during shutdown-ensuring zero leakage current through LEDs. The device operates over –40°C to +85°C junction temperature range and requires only a 10μH inductor and two 1μF ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-ion (3.0–4.2V), two alkaline (2.0–3.2V with logic supply separation), or 3.3V system rails. |
| Switching Frequency | 1MHz (±15%) - enables use of tiny 10μH inductors and 1μF ceramic output capacitor, minimizing board area and EMI filtering needs. |
| LED Current Accuracy | ±5% at full scale - ensures consistent brightness across production units without per-unit calibration. |
| Shutdown Current | 3μA - extends battery life in always-on portable devices during display-off states. |
| Brightness Control Range | 32:1 linear (625μA to 20mA) - achieved via 32 discrete CTRL pin rising edges, enabling precise software-tuned dimming without PWM flicker. |
| Overvoltage Clamp | 38V (typ) - protects downstream components during LED open-circuit failure by limiting CAP pin voltage and reducing switching frequency. |
| Max Duty Cycle | 94% - supports high step-up ratios required for driving 10× white LEDs (≈30V output) from low VIN (e.g., 2.7V). |
Pinout & Package
LT3593ES6#TRPBF is housed in a 6-lead plastic TSOT-23 package (2.9mm × 1.6mm × 0.9mm), optimized for high-density portable PCB layouts. The exposed pad is absent in TSOT-23; thermal performance relies on soldered leads and PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CTRL (Pin 1) | Current Programming & Shutdown Control | Rising-edge strobed to decrement internal 5-bit DAC; held low >128μs forces shutdown; no external pull-up required. |
| GND (Pin 2) | Power Ground Reference | Primary return path for switch current and internal bias; must connect directly to low-impedance PCB ground plane. |
| VIN (Pin 3) | Input Supply Input | Connects to 2.7–5.5V source; requires local 1μF X5R/X7R ceramic bypass capacitor placed adjacent to pin. |
| SW (Pin 4) | Power Switch Node | Drives external inductor; high di/dt node-requires short, wide trace to minimize EMI and voltage spikes. |
| CAP (Pin 5) | Regulated Output Capacitor Node | Connects to 1μF output capacitor; high-frequency switching node-place capacitor within 2mm for stability. |
| LED (Pin 6) | High-Side LED String Connection | Internally switches to CAP during operation; disconnected in shutdown; enables ground-referenced LED strings. |
Key Features
| Feature | Design Value |
|---|---|
| One-pin current programming | CTRL pin accepts 32 discrete rising edges to set LED current from 20mA down to 625μA in 625μA steps-no I²C, analog voltage, or external DAC needed. |
| Output disconnect in shutdown | Internal switch isolates LED pin from CAP node during shutdown-eliminates residual LED glow and reduces system standby power. |
| High-side current sensing | Enables LED cathodes to be grounded-simplifies PCB routing, avoids floating grounds, and ensures matched current without ballast resistors. |
| Open-LED fault protection | Clamps CAP voltage at 38V and reduces switching frequency to limit input current-prevents damage during LED string breakage or connector disconnection. |
| 1MHz fixed-frequency operation | Reduces input ripple and simplifies EMI filtering versus variable-frequency alternatives; allows smaller passive components than lower-frequency boost converters. |
Applications
| Cell Phones | Digital Cameras |
|---|---|
Use Scenario: Backlighting for 2.4"–3.5" OLED or TFT LCD displays in slim smartphones with single Li-ion battery. IC Role / Device Role / Timing Role: Constant-current boost regulator providing stable 15–20mA per LED across 6–10 series LEDs, with programmable dimming via baseband processor GPIO. Use Value: Eliminates need for external current-setting resistors or PWM dimming circuitry-reducing BOM count and PCB area while maintaining color consistency. |
Use Scenario: Flash LED driver for autofocus assist and still-image capture in compact digital cameras powered by two AA cells. IC Role / Device Role / Timing Role: High-efficiency boost controller delivering 350mA peak flash current (via burst mode) and 20mA preview current, with fast CTRL-based enable/disable. Use Value: Achieves >80% efficiency at 3.0V input driving 3 white LEDs-extending battery life during repeated flash usage without thermal derating. |
| PDAs / Handheld Computers | GPS Receivers |
Use Scenario: Main display backlight in industrial PDA with extended temperature operation (–40°C to +85°C). IC Role / Device Role / Timing Role: Temperature-stable LED driver maintaining ±5% current accuracy across full operating range, controlled via microcontroller GPIO. Use Value: Ensures readable display brightness in outdoor environments without recalibration-leveraging guaranteed specs over –40°C to +85°C junction range. |
Use Scenario: Status indicator and map backlight in automotive-grade GPS units using 3.3V system rail. IC Role / Device Role / Timing Role: Low-noise, low-EMI LED driver with 1MHz switching synchronized to avoid interference with GPS RF front-end. Use Value: Minimizes conducted emissions near 1.575GHz L1 band-verified by typical performance curves showing clean switching waveforms and low input ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3591EDCB#TRMPBF | Same 1MHz boost architecture but in 3mm × 2mm DFN; integrates Schottky diode; higher IQ (4mA) and ISD (<11μA); supports up to 10 LEDs. | Eliminates external diode but requires larger footprint; better suited for designs prioritizing component count reduction over board area. | Select LT3591 when diode integration and slightly higher efficiency at light loads outweigh TSOT-23 size constraints. |
| LT1932ES6#TRMPBF | 1.2MHz boost driver; supports up to 8 LEDs; lower max VOUT (34V vs 45V); higher quiescent current (1.2mA); thinner TSOT-23 package. | Lower output voltage headroom limits use to ≤8 LEDs at full brightness; preferred where ultra-low profile (<0.8mm height) is critical. | Choose LT1932 for space-constrained applications needing <0.8mm profile and ≤8-LED strings-avoid for 10-LED or high-VF LED configurations. |
Compared with LT3593ES6#TRPBF, LT3591 offers integrated diode and tighter thermal resistance but larger footprint, while LT1932 trades output voltage margin and LED count support for reduced height-making LT3593ES6#TRPBF optimal for 10-LED, ultra-compact, and high-reliability portable backlighting.
Availability
LT3593ES6#TRPBF is available at Aetrix Electronics and suitable for cell phones, digital cameras, PDAs/handheld computers, and GPS receivers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3593ES6#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 its precision analog and power management product lines with full datasheet, simulation model, and application support.
The LT3593ES6#TRPBF belongs to Linear's white LED boost driver family, engineered specifically for portable display backlighting where small size, high efficiency, and accurate current regulation are essential under varying battery voltage conditions.
FAQ
What is the maximum number of white LEDs the LT3593ES6#TRPBF can drive?
The LT3593ES6#TRPBF is specified to drive up to ten white LEDs in series from a 3V supply. This assumes typical white LED forward voltage of ~3V per diode, resulting in ~30V total VF. The device's 45V absolute maximum LED pin voltage and 38V overvoltage clamp provide sufficient margin for this configuration, as confirmed in the Typical Application circuits and Electrical Characteristics table.
How does the CTRL pin programming work on the LT3593ES6#TRPBF?
The CTRL pin on the LT3593ES6#TRPBF accepts rising-edge pulses to decrement an internal 5-bit counter, each step reducing LED current by 625μA from 20mA down to 625μA. After the final pulse, the part waits 128μs before applying the new current value. Holding CTRL low for >128μs places LT3593ES6#TRPBF into shutdown mode-no external logic or timing circuitry is required.
Does the LT3593ES6#TRPBF require an external Schottky diode?
Yes, the LT3593ES6#TRPBF requires an external Schottky diode connected between the SW and CAP pins. Unlike some newer Linear/Analog Devices LED drivers (e.g., LT3591), LT3593ES6#TRPBF does not integrate the diode. Recommended parts include CMDSH05-4 or PMEG4005AEA-selected for low VF and low capacitance at 1MHz switching.
What is the recommended output capacitor value for the LT3593ES6#TRPBF?
The LT3593ES6#TRPBF requires only a 1μF X5R or X7R ceramic capacitor on the CAP pin. This value is validated across all typical applications-including driving 1 to 10 white LEDs-and ensures stable regulation, low output ripple, and minimal board area. Larger values do not improve performance and may degrade transient response.
Is the LT3593ES6#TRPBF compatible with both DFN and TSOT-23 packages?
No-the LT3593ES6#TRPBF is exclusively the 6-lead TSOT-23 variant (part marking LTDBS). The DFN version is designated LT3593EDC#TRPBF (marking LDBR). Pinouts differ: TSOT-23 assigns CTRL to Pin 1 and LED to Pin 6, while DFN places CTRL on Pin 3 and LED on Pin 4. PCB layout and footprint must match the specific package variant ordered.
LT3593ES6#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3593ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3593ES6#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 LT3593ES6#TRPBF reliable?
The price and inventory of LT3593ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3593ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3593ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3593ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3593ES6#TRPBF?
LT3593ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3593ES6#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 LT3593ES6#TRPBF?
For technical support, including LT3593ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3593ES6#TRPBF requirements.
6.How does Aetrix verify that LT3593ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3593ES6#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 LT3593ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3593ES6#TRPBF?
All LT3593ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3593ES6#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 LT3593ES6#TRPBF part is unused and in its original packaging.
Return procedure for LT3593ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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