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Analog Devices Inc. LT3591EDDB#TRMPBF
- Part No.:
- LT3591EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3591EDDB#TRMPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,036
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Product details
Overview
LT3591EDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode step-up DC/DC converter IC designed to drive up to ten white LEDs in series from a single Li-Ion cell (2.5V–12V input). It integrates a Schottky diode and uses high-side current sensing for true one-wire LED string connection. Key confirmed parameters: 1MHz switching frequency, ±5% reference accuracy, 42V open-LED protection, 200mV sense voltage, and 80:1 True Color PWM dimming range. It is deployed in compact portable displays requiring uniform brightness and minimal external components.
For engineers reviewing the LT3591EDDB#TRMPBF datasheet, LT3591EDDB#TRMPBF pinout, LT3591EDDB#TRMPBF application, or LT3591EDDB#TRMPBF equivalent, key selection criteria include its integrated Schottky diode, high-side current sense architecture, 3mm × 2mm DFN package with exposed thermal pad, and compatibility with analog/PWM dimming schemes across 2–10 LED strings.
Technical Context
The LT3591EDDB#TRMPBF employs constant-frequency current-mode control with an internal ramp generator and PWM comparator (A2) referenced to an error amplifier (A1) that regulates VCAP–VLED against a 1.25V bandgap. Its start-up bias and oscillator activate when CTRL exceeds 100mV, and shutdown occurs below 50mV.
Operation relies on internal switch Q1 (500mA min current limit, 200mV VCESAT), integrated Schottky (0.8V forward drop at 200mA), and overvoltage protection clamping CAP at 42V during open-LED fault. The high-side sense topology eliminates ground-referenced ballast resistors and enables flexible LED string grounding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 12V - supports direct Li-Ion (3.0–4.2V) and multi-cell alkaline/battery inputs without pre-regulation. |
| Switching Frequency | 1MHz (typ) - enables use of small 22µH inductors and 2.2µF ceramic output capacitors, minimizing board area. |
| LED Sense Voltage | 200mV (±5%) - sets LED current via ILED = 200mV / RSENSE; enables precise 1% resistor-based programming. |
| Open-LED Protection | 42V clamp (typ) - limits CAP voltage during LED string disconnection or failure, preventing component overstress. |
| Dimming Range | 80:1 True Color PWM - maintains chromaticity across full brightness range by avoiding analog current modulation. |
| Package | 8-lead 3mm × 2mm × 0.75mm DFN with exposed thermal pad - provides low θJA (76°C/W) for thermally constrained handheld PCBs. |
| CTRL Interface | Single-pin shutdown & dimming - 0–50mV = shutdown; 100–1500mV = linear LED current control; >1500mV = full-scale current. |
Pinout & Package
LT3591EDDB#TRMPBF is housed in an 8-lead plastic DFN (3mm × 2mm) with exposed thermal pad (Pin 9), which must be soldered to PCB ground for thermal performance. Pin 1 marked with bar; top marking "LCPG".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2.5V–12V; requires local 1µF ceramic bypass capacitor to minimize noise and input ripple. |
| GND (Pin 2) | Ground reference | Primary signal ground; connects directly to PCB ground plane; ties to exposed pad (Pin 9). |
| SW (Pin 4) | Power switch node | Drives external inductor; high dv/dt node-must minimize trace length/area to reduce EMI. |
| CAP (Pin 5) | Output driver cathode | Connects to cathode of internal Schottky; output capacitor (2.2µF) and sense resistor attach here. |
| LED (Pin 7) | LED string anode/sense point | Connects to anode of first LED and sense resistor; forms high-side current sense path with CAP. |
| CTRL (Pin 8) | Dimming & shutdown control | Analog voltage input (0–1.5V) or PWM signal; no floating allowed; internal 100nA bias current. |
| Exposed Pad (Pin 9) | Thermal & electrical ground | Mandatory connection to PCB ground plane; critical for thermal dissipation and stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, saving 1.5mm² board space and reducing BOM count in ultra-thin portable designs. |
| High-side LED current sense | Enables true one-wire LED string connection-LED cathode can return to system ground anywhere, simplifying flex-cable routing. |
| True Color PWM dimming | 80:1 range with no chromaticity shift-achieved by full-on/full-off LED current switching instead of analog current scaling. |
| Single-pin dimming/shutdown | Reduces GPIO usage on host MCU; supports both filtered PWM and direct PWM control without additional logic circuitry. |
| 42V open-LED protection | Prevents destructive overvoltage during LED string breakage or connector disconnection-no external clamp required. |
Applications
| Cellular Phones | Digital Cameras |
|---|---|
Use Scenario: Backlighting for 3.5"–5" OLED/LCD main displays in LTE smartphones with dual-SIM and high-resolution UI. IC Role / Device Role / Timing Role: Constant-current boost controller delivering regulated 20–30mA per LED across 6–10-series white LEDs from 3.8V battery rail. Use Value: Uniform brightness without ballast resistors; 80:1 dimming preserves color fidelity during video playback and low-light UI navigation. | Use Scenario: Flash illumination and rear-panel display backlight in compact point-and-shoot cameras with optical zoom. IC Role / Device Role / Timing Role: High-efficiency LED driver supporting burst-mode flash (100mA peak) and steady-state display backlight (15mA) from 3.0V alkaline supply. Use Value: Integrated Schottky and 1MHz operation enable <5mm² total solution size; 42V OVP protects against flash capacitor coupling faults. |
| MP3 Players | GPS Receivers |
Use Scenario: Monochrome OLED status display and button backlighting in battery-powered audio players with 20+ hour runtime. IC Role / Device Role / Timing Role: Low-quiescent-current (4–5mA typ) boost converter driving 2–4 white LEDs at 2–5mA for ultra-low-power standby mode. Use Value: Minimum 2mA LED current without pulse-skipping ensures flicker-free UI visibility; CTRL pin allows MCU-controlled sleep/wake dimming. | Use Scenario: Map display and status LED backlighting in automotive-grade portable GPS units operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust LED driver maintaining 20mA current regulation across wide VIN (2.5–12V) and temperature (–40°C to 85°C). Use Value: Guaranteed performance over full industrial temp range; exposed pad ensures thermal stability during extended outdoor operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3491EDD#TRPBF | 2.3MHz switching, drives ≤6 LEDs, lower max VOUT (27V), same DFN package but different pinout (no NC pins). | Better suited for space-constrained 3–6 LED strings where higher frequency allows smaller inductors; lacks 42V OVP headroom for 10-LED strings. | Select when board layout prioritizes 2.3MHz operation and LED count ≤6; verify CTRL interface compatibility and re-route SW/CAP/LED connections. |
| LT3465AEDD#TRPBF | 1.2MHz/2.7MHz dual-frequency option, drives ≤6 LEDs, integrated Schottky, 34V max VOUT, different pin assignment (CTRL = Pin 5, LED = Pin 6). | Offers higher efficiency at light loads due to Burst Mode™; limited to 6 LEDs and 34V clamp-insufficient for 10-LED strings at full brightness. | Choose for 4–6 LED applications needing lowest quiescent current (<1.9mA); not drop-in-requires PCB redesign and updated RSENSE calculation. |
Compared with LT3591EDDB#TRMPBF, LT3491EDD#TRPBF offers higher switching frequency but reduced LED count and OVP margin, while LT3465AEDD#TRPBF adds Burst Mode™ efficiency at light loads but sacrifices 10-LED capability and requires pinout revision-neither is pin-compatible.
Availability
LT3591EDDB#TRMPBF is available at Aetrix Electronics and suitable for cellular phones, digital cameras, MP3 players, and GPS receivers requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature grade performance.
Supply support for LT3591EDDB#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 IC products, including precision power management solutions.
The LT3591EDDB#TRMPBF belongs to Linear's white LED driver product line, engineered specifically for high-brightness, low-profile portable displays where uniform current matching, minimal external components, and robust fault protection are critical.
FAQ
What is the maximum number of white LEDs the LT3591EDDB#TRMPBF can drive?
The LT3591EDDB#TRMPBF is specified to drive up to ten white LEDs in series from a single Li-Ion cell. This assumes typical forward voltage of 3.2V–3.6V per LED, resulting in ~32–36V total string voltage, well within the device's 42V open-LED protection clamp and 45V absolute maximum LED pin rating. Driving more than ten LEDs risks exceeding the CAP pin overvoltage threshold and triggering continuous fault limiting.
Does the LT3591EDDB#TRMPBF require an external Schottky diode?
No, the LT3591EDDB#TRMPBF integrates a Schottky diode rated for 1A peak current and 0.8V forward drop at 200mA. External diodes are optional and only recommended in non-space-constrained designs where 1–2% efficiency gain justifies added cost and board area-e.g., using PMEG4005AEA for higher-current or lower-temperature operation.
How does the high-side current sense in the LT3591EDDB#TRMPBF simplify LED string layout?
The LT3591EDDB#TRMPBF's high-side sense architecture allows the LED string cathode to connect directly to system ground anywhere-eliminating the need for a dedicated ground-return trace from the LED module. This reduces flex-cable conductor count, avoids ground-loop issues in stacked PCB assemblies, and simplifies mechanical integration in clamshell or slider form factors.
What is the minimum LED current achievable with the LT3591EDDB#TRMPBF before pulse skipping occurs?
The LT3591EDDB#TRMPBF maintains regulated LED current down to 2mA without pulse skipping when driving a 2-LED string using the standard 22µH inductor and 10Ω sense resistor. Below 2mA, the device enters discontinuous conduction mode with controlled pulse skipping-average current remains accurate, but low-frequency ripple may appear in the LED waveform.
Can the LT3591EDDB#TRMPBF operate from two AA alkaline cells?
Yes-the LT3591EDDB#TRMPBF supports input voltages as low as 2.5V, making it compatible with two fresh AA alkaline cells (nominal 3.0V, range 2.0–3.2V). For optimal efficiency, the inductor should be powered from the battery while the IC's VIN pin is supplied from a stable 3.3V logic rail, as demonstrated in Figure 10 of the datasheet.
LT3591EDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 2.5V
- Voltage - Supply (Max):
- 12V
- Voltage - Output:
- -
- Current - Output / Channel:
- 500mA (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3591EDDB#TRMPBF FAQ
1.How can I place an order for LT3591EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3591EDDB#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 LT3591EDDB#TRMPBF reliable?
The price and inventory of LT3591EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3591EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3591EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3591EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3591EDDB#TRMPBF?
LT3591EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3591EDDB#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 LT3591EDDB#TRMPBF?
For technical support, including LT3591EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3591EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3591EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3591EDDB#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 LT3591EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3591EDDB#TRMPBF?
All LT3591EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3591EDDB#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 LT3591EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3591EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3591EDDB#TRMPBF Tags
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