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Analog Devices Inc. LT1932ES6#TRPBF
- Part No.:
- LT1932ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1932ES6#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,724
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Product details
Overview
LT1932ES6#TRPBF 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 using a single external RSET resistor, operates with input voltage as low as 1V, delivers up to 80% efficiency, and maintains regulation even when VIN > VOUT - enabling direct drive of multi-LED strings from Li-ion or single-cell sources.
For engineers reviewing the LT1932ES6#TRPBF datasheet, LT1932ES6#TRPBF pinout, LT1932ES6#TRPBF application, or LT1932ES6#TRPBF equivalent, key selection criteria include its 1.2MHz fixed-frequency current-mode control, shutdown quiescent current <1µA, 100mV RSET reference, LED pin voltage drop of 120–180mV, and compatibility with ceramic capacitors and low-profile 1mm-height inductors in space-constrained portable designs.
Technical Context
The LT1932ES6#TRPBF employs a constant-frequency, current-mode PWM control architecture with an internal 1.2MHz oscillator and dual NPN switches (Q1 power switch, Q2 LED switch). Its error amplifier A1 compares sensed LED current against a 100mV RSET reference to set peak switch current via the PWM comparator A2.
It supports multiple dimming methods: DC voltage on RSET, PWM on SHDN (enabling full-on/off operation), filtered PWM for DC-like control, logic-level stepped adjustment, and soft-start via external RC. The device inherently handles VIN > VOUT by modulating Q2's saturation state to maintain precise current regulation without external sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V to 10V - enables 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 (±0.4MHz) - permits use of miniature 1mm-height chip inductors and low-ESR ceramic capacitors. |
| RSET Pin Voltage | 100mV (regulated) - establishes ISET = 100mV/RSET; output current ILED = 225 × ISET. |
| Quiescent Current | ≤1.0µA in shutdown (VSHDN < 0.25V) - ensures ultra-low battery drain in standby mode. |
| LED Pin Voltage Drop | 120–180mV at 15mA - low VCE(sat) of internal NPN LED switch minimizes conduction loss. |
| Switch Current Limit | 400–780mA - protects internal power transistor during startup or overload conditions. |
Pinout & Package
LT1932ES6#TRPBF is housed in a 6-lead plastic SOT-23 package (ThinSOT™), measuring 2.80–3.10mm × 1.50–1.75mm × 1.00mm max height, with gull-wing leads and pin 1 marked by a dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Internal NPN power switch collector | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimal trace area to reduce EMI. |
| GND (Pin 2) | Power and signal ground reference | Must tie directly to local ground plane - not shared with RSET or other noisy return paths. |
| LED (Pin 3) | Internal NPN LED switch collector | Drives LED string cathode; low 120–180mV saturation voltage enables efficient current sinking. |
| RSET (Pin 4) | Current programming and dimming input | Internally regulated to 100mV; accepts DC voltage, PWM, or logic signals to adjust ILED dynamically. |
| SHDN (Pin 5) | Enable/disable control input | Logic-high (>0.85V) enables operation; logic-low (<0.25V) disconnects LEDs and reduces IQ to <1µA. |
| VIN (Pin 6) | Main input supply connection | Accepts 1V–10V; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current regulation | Directly controls LED brightness independent of forward voltage variation across temperature or unit-to-unit spread. |
| 1.2MHz fixed-frequency operation | Enables use of compact 4.7µH–6.8µH ferrite chip inductors ≤1mm tall and X5R/X7R ceramic capacitors. |
| VIN > VOUT regulation capability | Maintains stable LED current even when input exceeds LED string voltage - simplifies battery-powered multi-LED designs. |
| Multi-method dimming support | Hardware-compatible with SHDN-PWM (full on/off), RSET-PWM (filtered or direct), DC voltage, and logic-stepped control. |
| Ultra-low shutdown current | <1µA total circuit quiescent current eliminates battery drain in off-state - critical for always-on portable devices. |
Applications
| Backlit LCD Display Driver | Portable Medical Device Indicator |
|---|---|
|
Use Scenario: Driving 4–6 white LEDs in handheld ultrasound or glucose meter displays powered by a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Constant-current boost controller regulating 15–20mA per LED string with 1.2MHz switching to minimize EMI near sensitive analog front-ends. Use Value: Delivers consistent luminance across battery discharge (2.7V–4.2V), eliminates need for external current-sense resistors, and achieves >75% efficiency at 15mA load. |
Use Scenario: Powering status LEDs and optical sensors in battery-operated wearable vital sign monitors. IC Role / Device Role / Timing Role: Low-quiescent-current LED driver enabling >1-year battery life in sleep mode while supporting programmable brightness via MCU GPIO. Use Value: Shutdown current <1µA extends shelf life; RSET dimming preserves color fidelity at 15mA nominal current for clinical-grade visual feedback. |
| Smartphone Front Camera Flash | Industrial Handheld Scanner Illumination |
|
Use Scenario: Providing brief, high-intensity illumination for smartphone front-facing cameras using two parallel LED strings. IC Role / Device Role / Timing Role: Fast-response current source supporting 30–40mA pulsed output via SHDN-PWM dimming at 5kHz–20kHz. Use Value: Clean PWM tracking (no delay or overshoot) ensures linear brightness control and purest white light at peak current - avoiding blue tint in captured images. |
Use Scenario: Illuminating barcode scan windows in ruggedized industrial PDAs operating from 2.0–3.6V primary cells. IC Role / Device Role / Timing Role: Robust LED driver with open-circuit protection (via optional Zener) and wide 1V–10V input range for variable battery chemistries. Use Value: Tolerates input dips to 1V during motor startup; integrated switch current limiting prevents damage during LED string disconnection events. |
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; wider 2.7V–20V input; integrated Schottky; 6-lead DFN (3mm × 3mm). | Supports higher LED string voltages (up to 36V); better suited for 8–10 LED strings from 3.3V/5V rails. | Choose LT3466EDD#TRPBF when needing >36V output capability or smaller footprint than ThinSOT - but note different pinout and no VIN < 2.7V operation. |
| TPS61061DRVR | TI part with 1.2MHz switching; 2.7V–5.5V input; 1.25V internal reference; 6-pin WSON (2mm × 2mm). | Lacks VIN > VOUT regulation; requires external current-sense resistor; no RSET-based dimming flexibility. | Choose TPS61061DRVR only for cost-sensitive, fixed-brightness designs where input stays above 2.7V and LED count is ≤4. |
Compared with LT3466EDD#TRPBF and TPS61061DRVR, the LT1932ES6#TRPBF uniquely supports 1V start-up, VIN > VOUT regulation, and true RSET-programmed dimming - making it optimal for ultra-low-voltage, multi-cell, and color-critical portable LED applications where footprint and efficiency are tightly constrained.
Availability
LT1932ES6#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, handheld scanners, smartphone camera flash modules, and battery-powered LCD backlighting requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for LT1932ES6#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 portfolio. Linear pioneered high-performance DC/DC converters and LED drivers for portable electronics.
The LT1932ES6#TRPBF belongs to Linear's ThinSOT™ LED driver family, designed specifically for space-constrained, battery-powered applications demanding high efficiency, low quiescent current, and flexible dimming - especially where input voltage may dip below LED forward voltage.
FAQ
What is the minimum input voltage required for LT1932ES6#TRPBF to start switching?
The LT1932ES6#TRPBF begins switching at an absolute minimum input voltage of 1V, as specified in its Absolute Maximum Ratings and confirmed across electrical characteristics tables. This allows reliable operation from nearly-dead alkaline or NiMH cells and single Li-ion cells down to end-of-discharge voltage (~2.7V), making LT1932ES6#TRPBF ideal for ultra-low-voltage portable LED applications.
How does LT1932ES6#TRPBF regulate LED current when input voltage exceeds LED string voltage?
The LT1932ES6#TRPBF uses dedicated circuitry to modulate the saturation state of its internal NPN LED switch (Q2) - keeping it saturated when VIN < VOUT for low-loss operation, and partially unsaturating it when VIN > VOUT to maintain precise current regulation without external components. This behavior is explicitly documented in the "Regulating LED Current when VIN > VOUT" section of the datasheet and verified in typical performance curves.
Can LT1932ES6#TRPBF drive more than six white LEDs?
Yes - the LT1932ES6#TRPBF can drive up to eight white LEDs from a 3V input and ten white LEDs from a 4.2V Li-ion source, as demonstrated in Figures TA13a and TA16a of the official datasheet. Output voltage headroom depends on total LED VF and the 180mV maximum LED pin voltage drop; design margin must account for worst-case VF spread and temperature drift.
What is the purpose of the 100mV regulation on the RSET pin of LT1932ES6#TRPBF?
The RSET pin of LT1932ES6#TRPBF is internally regulated to exactly 100mV, establishing a precise reference for setting LED current: ILED = 225 × (100mV / RSET). This eliminates dependency on external reference accuracy and enables predictable, resistor-determined current scaling - e.g., 1.50kΩ yields 15mA (225 × 0.1V / 1500Ω). The 100mV value is confirmed in Electrical Characteristics Table and block diagram annotations.
Does LT1932ES6#TRPBF require external compensation components?
No - the LT1932ES6#TRPBF uses an internally compensated current-mode control architecture. No external compensation network is needed; stability is ensured across all valid operating conditions (input voltage, LED current, inductor value) per the manufacturer's typical application circuits and layout guidelines. All recommended designs in the datasheet operate without added compensation components.
LT1932ES6#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):
- 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#TRPBF FAQ
1.How can I place an order for LT1932ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1932ES6#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 LT1932ES6#TRPBF reliable?
The price and inventory of LT1932ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1932ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1932ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1932ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1932ES6#TRPBF?
LT1932ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1932ES6#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 LT1932ES6#TRPBF?
For technical support, including LT1932ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1932ES6#TRPBF requirements.
6.How does Aetrix verify that LT1932ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1932ES6#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 LT1932ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1932ES6#TRPBF?
All LT1932ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1932ES6#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 LT1932ES6#TRPBF part is unused and in its original packaging.
Return procedure for LT1932ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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