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Analog Devices Inc. LT1932ES6#TRMPBF
- Part No.:
- LT1932ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1932ES6#TRMPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1932ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-current, step-up DC/DC LED driver in a 6-lead ThinSOT (SOT-23) package. It regulates LED current from 5mA to 40mA via a single RSET resistor, operates with input voltage as low as 1V, delivers up to 80% efficiency, and maintains regulation even when VIN > VOUT - enabling robust single-cell Li-ion and alkaline battery-powered lighting.
For engineers reviewing the LT1932ES6#TRMPBF datasheet, LT1932ES6#TRMPBF pinout, LT1932ES6#TRMPBF application, or LT1932ES6#TRMPBF equivalent, key selection criteria include its 1.2MHz fixed-frequency current-mode control, shutdown quiescent current <1µA, LED current temperature coefficient of –0.02mA/°C, compatibility with ceramic capacitors and low-profile 1mm-height inductors, and support for PWM, DC, and logic-based dimming schemes.
Technical Context
The LT1932ES6#TRMPBF employs a constant-frequency current-mode control architecture with an internal 1.2MHz oscillator, peak-current sensing via SW pin feedback, and dual NPN switches (Q1 power switch, Q2 LED switch) to directly regulate output current. Its error amplifier (A1) compares RSET-referenced current (100mV setpoint) against sensed LED current, adjusting peak switch current to maintain ILED = 225 × (100mV / RSET).
It supports operation across three voltage regimes: VIN < VOUT (boost mode), VIN ≈ VOUT (transition), and VIN > VOUT (linear-regulator-like LED-switch conduction), where Q2 exits saturation to preserve current regulation without external components. Shutdown is controlled by a precise 0.85V turn-on / 0.25V turn-off threshold on SHDN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 10V - enables direct operation from single alkaline, NiMH, or Li-ion cells without pre-regulation. |
| LED Current Range | 5mA to 40mA - set precisely via RSET (e.g., 1.50kΩ → 15mA), with ±5% typical accuracy at TA = 25°C. |
| Switching Frequency | 1.2MHz (±20%) - permits use of compact 4.7µH–6.8µH chip inductors ≤1mm height and low-ESR ceramic capacitors. |
| Quiescent Current | ≤1.0µA in shutdown - ensures zero-load battery drain in portable standby modes. |
| RSET Pin Voltage | 100mV (regulated) - provides stable reference for accurate current programming independent of supply or temperature drift. |
| LED Pin Voltage Drop | 120–180mV at 15mA - low VCE(sat) of internal NPN LED switch minimizes power loss and thermal rise. |
| Switch Current Limit | 400–780mA - protects internal power transistor during startup, short-circuit, or high-duty-cycle conditions. |
Pinout & Package
LT1932ES6#TRMPBF is housed in a 6-lead plastic SOT-23 package (ThinSOT™), measuring 2.9mm × 1.6mm × 1.0mm max height, with gull-wing leads and pin 1 marked by a dot. Thermal resistance θJA = 250°C/W enables operation up to TJ = 125°C in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node (collector of internal NPN power switch) | Connects to inductor and Schottky diode anode; requires minimal trace area to reduce EMI and switching losses. |
| GND (Pin 2) | Power ground reference | Must tie directly to local ground plane - not shared with RSET or other analog return paths to avoid noise coupling. |
| LED (Pin 3) | LED string cathode connection (collector of internal NPN LED switch) | Sinks regulated current; voltage drop ≤180mV at 15mA enables efficient multi-LED strings. |
| RSET (Pin 4) | Current programming and dimming interface | Internally regulated to 100mV; accepts PWM, DC voltage, or logic signals to adjust ILED from full scale to zero. |
| SHDN (Pin 5) | Enable/disable control input | Logic-compatible: ≥0.85V = ON, ≤0.25V = OFF; draws ≤0.1µA in shutdown, disconnecting LEDs fully. |
| VIN (Pin 6) | Main input supply (1V–10V) | Requires local 2.2µF–4.7µF ceramic bypass capacitor placed adjacent to pin to suppress high-frequency ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current regulation with VIN > VOUT capability | Enables single-driver solutions for variable-input systems (e.g., discharging Li-ion from 4.2V to 2.7V) while maintaining stable LED brightness. |
| 1.2MHz fixed-frequency current-mode control | Reduces EMI filtering requirements and allows use of miniature 1mm-height inductors (e.g., Sumida CLQ4D10-6R8) and X5R/X7R ceramics. |
| Multi-mode dimming interface (RSET pin) | Supports PWM (5–40kHz), filtered PWM, DC voltage, logic-level, and soft-start - all without external op-amps or DACs. |
| Inherent open-circuit protection awareness | Maximum duty cycle clamping prevents destructive overvoltage at SW pin if LED string opens; zener clamping recommended for safety-critical designs. |
| Ultra-low shutdown current (<1µA) | Extends battery life in always-on portable devices (e.g., pagers, medical indicators) with no need for external load switches. |
Applications
| Backlit Keypad Lighting | Portable Medical Indicator |
|---|---|
|
Use Scenario: Driving 2–4 white LEDs behind rubber keypad overlays in handheld diagnostic tools powered by single AA/AAA cells. IC Role / Device Role / Timing Role: Constant-current boost driver regulating 15–20mA per LED string, dynamically adjusting brightness via microcontroller-generated PWM on SHDN pin. Use Value: Maintains consistent luminance across 1.0V–1.5V input range and eliminates color shift by ensuring LEDs operate only at calibrated current levels. |
Use Scenario: Powering status LEDs on battery-operated pulse oximeters and glucose meters requiring >5-year shelf life and low standby drain. IC Role / Device Role / Timing Role: Low-quiescent LED driver with <1µA shutdown, enabling "always-connected" visual alerts without compromising primary sensor battery budget. Use Value: Eliminates need for discrete enable FETs or mechanical switches, reducing BOM count and PCB area while meeting IEC 62304 leakage requirements. |
| Digital Camera Flash Assist | Wearable Display Backlight |
|
Use Scenario: Providing continuous focus-assist illumination in compact digital cameras using 2.7V–4.2V Li-ion supply and driving 5–6 white LEDs. IC Role / Device Role / Timing Role: High-efficiency (up to 80%) boost converter delivering 15mA per LED with fast PWM dimming response (no delay, linear tracking per Figure 5). Use Value: Enables silent, flicker-free assist light synchronized to autofocus timing - critical for video recording and low-light still capture. |
Use Scenario: Backlighting OLED or reflective LCD in smartwatches and hearables powered by coin-cell or thin-film batteries (1.2V–3.0V). IC Role / Device Role / Timing Role: Ultra-thin (1mm max height) LED driver supporting 1–3 LED strings with programmable current and DC-dimming for ambient light adaptation. Use Value: Achieves >75% efficiency at 1.2V input with 4.7µH inductor, preserving limited energy capacity while meeting wearable thickness constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3466EDD#TRPBF | Higher 3MHz switching frequency; integrated Schottky; wider 2.5V–16V input; 1.2A switch limit. | Targets higher-power LED strings (e.g., 8–10 white LEDs from 3.3V); requires larger inductor footprint. | Choose for >40mA drive capability or tighter board space where 3MHz allows smaller LC values - not drop-in compatible due to different pinout and biasing. |
| TPS61061DRVR | TI part with 1.4MHz frequency; 30V LED voltage rating; integrated 0.5Ω current sense; 2.7V–5.5V input only. | Optimized for USB-powered or regulated 3.3V/5V systems; lacks sub-1.5V start-up and VIN > VOUT regulation. | Prefer when supply is fixed-rail and cost sensitivity outweighs ultra-low-VIN flexibility; requires redesign of RSET network and layout. |
Compared with LT1932ES6#TRMPBF, LT3466EDD#TRPBF offers higher power headroom but sacrifices single-cell alkaline compatibility, while TPS61061DRVR simplifies BOM with integrated diode but cannot regulate below 2.7V input or handle VIN > VOUT scenarios - making LT1932ES6#TRMPBF uniquely suited for wide-input, low-height, battery-first designs.
Availability
LT1932ES6#TRMPBF is available at Aetrix Electronics and suitable for portable medical devices, handheld industrial scanners, and consumer wearables requiring stable component supply, long-lifecycle availability, and guaranteed RoHS-compliant packaging.
Supply support for LT1932ES6#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 product support, datasheet archives, and application engineering resources for legacy Linear parts including the LT1932 series.
The LT1932 belongs to Linear's precision LED driver family, designed specifically for space-constrained, battery-powered lighting where consistent current regulation, ultra-low shutdown current, and seamless dimming integration are mandatory.
FAQ
What is the minimum input voltage required for LT1932ES6#TRMPBF to start switching?
The LT1932ES6#TRMPBF begins switching at VIN ≥ 1.0V, verified across temperature and process corners. Startup occurs reliably down to 1.0V even with heavy output loading, enabling direct operation from nearly depleted alkaline or NiMH cells. The device sustains regulation down to this threshold without brownout reset or hiccup behavior - a key advantage over many competing boost drivers that require ≥1.8V.
Can LT1932ES6#TRMPBF drive LEDs when input voltage exceeds LED forward voltage?
Yes - the LT1932ES6#TRMPBF uniquely regulates LED current even when VIN > VOUT by controlling the conduction state of its internal NPN LED switch (Q2). When VIN exceeds the LED string voltage, Q2 operates in active region rather than saturation, maintaining precise current flow without external components or efficiency penalty. This feature is explicitly confirmed in the datasheet's "Regulating LED Current when VIN > VOUT" section.
How does the RSET pin support multiple dimming methods on LT1932ES6#TRMPBF?
The RSET pin on LT1932ES6#TRMPBF serves as a multifunction dimming interface: it accepts direct PWM (5–40kHz), filtered PWM (RC low-pass), analog DC voltage, logic-level signals via NMOS, or soft-start ramp. Internally regulated to 100mV, it converts injected current into proportional ILED reduction (ILED = 225 × (100mV − Vinjected) / RSET). All five methods are validated in Figures 6 and 7 of the datasheet.
What is the maximum number of white LEDs LT1932ES6#TRMPBF can drive from a 3.0V supply?
From a 3.0V supply, LT1932ES6#TRMPBF can drive up to eight white LEDs in series, as confirmed in the "Drives Eight White LEDs from 3V" feature list and Typical Application TA13. Each white LED is assumed ~3.2V VF at 15mA, totaling ~25.6V output - achievable due to the device's 36V SW and LED pin absolute maximum ratings and robust 1.2MHz boost topology with low-loss internal switches.
Does LT1932ES6#TRMPBF require external compensation components?
No - the LT1932ES6#TRMPBF uses an internally compensated current-mode control loop. No external compensation capacitors or resistors are needed for stability across its full operating range (1V–10V input, 5mA–40mA load, –40°C to 85°C). This simplifies design, reduces BOM count, and eliminates tuning effort - a deliberate architectural choice documented in the block diagram (Figure 1) and "Operation" section.
LT1932ES6#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):
- 1V
- Voltage - Supply (Max):
- 10V
- Voltage - Output:
- 36V
- Current - Output / Channel:
- 40mA
- Frequency:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1932ES6#TRMPBF FAQ
1.How can I place an order for LT1932ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1932ES6#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 LT1932ES6#TRMPBF reliable?
The price and inventory of LT1932ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1932ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1932ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1932ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1932ES6#TRMPBF?
LT1932ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1932ES6#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 LT1932ES6#TRMPBF?
For technical support, including LT1932ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1932ES6#TRMPBF requirements.
6.How does Aetrix verify that LT1932ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1932ES6#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 LT1932ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1932ES6#TRMPBF?
All LT1932ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1932ES6#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 LT1932ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT1932ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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