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Analog Devices Inc. LTC3202EMS#TRPBF
- Part No.:
- LTC3202EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3202EMS#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,557
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Product details
Overview
LTC3202EMS#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, constant-frequency fractional charge pump DC/DC converter designed for white LED backlighting. It delivers up to 125mA output current with regulated voltage or current mode, operates from 2.7V to 4.5V input, uses no inductors, and features programmable 0.2V/0.4V/0.6V feedback set points via D0/D1 pins.
For engineers reviewing the LTC3202EMS#TRPBF datasheet, LTC3202EMS#TRPBF pinout, LTC3202EMS#TRPBF application, or LTC3202EMS#TRPBF equivalent, key selection considerations include its 1.5MHz fixed-frequency operation, thermal shutdown protection, automatic soft-start, <1µA shutdown current, and compatibility with small ceramic flying capacitors in space-constrained portable displays.
Technical Context
The LTC3202EMS#TRPBF implements a two-phase nonoverlapping 1.5MHz oscillator driving a 2:3 fractional charge pump topology, enabling VOUT ≈ 1.5 × VIN without inductors. Regulation is achieved by sensing FB voltage and modulating pump strength through an internal 2-bit DAC controlled by D0/D1 logic inputs.
It supports both current-mode (LED brightness control via external sense resistor) and voltage-mode (resistive divider feedback) configurations. Built-in short-circuit current limiting (~250mA), thermal shutdown (~160°C), and soft-start (~500µs ramp) ensure robust operation in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 4.5V - compatible with single-cell Li-ion or Li-poly battery discharge profile. |
| Max Output Current | 125mA - sufficient to drive up to 6 parallel white LEDs at typical forward voltage. |
| Switching Frequency | 1.5MHz (typ) - enables use of small 1µF ceramic flying and output capacitors. |
| Shutdown Current | <1µA - preserves battery life during display off states. |
| Feedback Set Points | 0.2V / 0.4V / 0.6V - selectable via D0/D1 pins for precise LED current or output voltage programming. |
| Open-Loop Output Impedance | 4.5Ω to 6Ω - determines load regulation performance and maximum available current under varying VOUT. |
| Soft-Start Time | ~500µs - prevents inrush current into output capacitor during power-up or mode changes. |
Pinout & Package
Package: 10-pin MSOP (3mm × 3mm footprint, 0.5mm pitch), exposed pad not present (unlike DFN variant). Pin 5 is GND; Pin 11 is absent - confirms MSOP package mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1 (Pin 1) | Digital control input | MSB of 2-bit DAC; selects FB set point with D0 - must be driven to defined logic level. |
| FB (Pin 2) | Regulation feedback node | Senses output current (via sense resistor) or output voltage (via divider); error signal drives pump strength. |
| VOUT (Pin 3) | Charge pump output | Delivers regulated voltage/current to LED string; requires 1µF ceramic bypass to GND. |
| VIN (Pin 4) | Input supply | Accepts 2.7–4.5V; requires 1µF low-ESR ceramic bypass capacitor for stability and ripple reduction. |
| GND (Pin 5) | Analog and power ground | Reference for control circuitry and charge pump; must connect directly to low-impedance ground plane. |
| C2– (Pin 6) | Flying capacitor terminal | Connects to negative terminal of second flying capacitor (C2); polarity reversal occurs during switching cycle. |
| C2+ (Pin 7) | Flying capacitor terminal | Connects to positive terminal of second flying capacitor (C2); high dv/dt node requiring short PCB trace. |
| C1+ (Pin 8) | Flying capacitor terminal | Connects to positive terminal of first flying capacitor (C1); high dv/dt node requiring short PCB trace. |
| C1– (Pin 9) | Flying capacitor terminal | Connects to negative terminal of first flying capacitor (C1); polarity reversal occurs during switching cycle. |
| D0 (Pin 10) | Digital control input | LSB of 2-bit DAC; selects FB set point with D1 - must be driven to defined logic level. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates EMI-sensitive magnetics and reduces board area - ideal for ultra-thin LCD backlight modules. |
| Programmable current source | Internal 2-bit DAC enables 3-step LED brightness control without external PWM controller or DAC. |
| Low-noise constant frequency | 1.5MHz fixed switching minimizes audible noise and simplifies EMI filtering vs variable-frequency pumps. |
| Automatic soft-start | Linear 500µs output current ramp prevents inrush into LED string and output capacitor during startup or reconfiguration. |
| Thermal & short-circuit protection | Survives continuous VOUT-to-GND short; cycles safely in thermal shutdown without latch-up or damage. |
Applications
| Smartphone LCD Backlight | Tablet Display Driver |
|---|---|
Use Scenario: Driving 4–6 parallel white LEDs in a compact smartphone display module powered by a 3.6V Li-ion battery. IC Role / Device Role / Timing Role: Constant-current charge pump regulator providing stable LED current despite battery voltage sag from 4.2V to 3.0V. Use Value: Delivers 125mA total output with <1µA shutdown current, extending standby time while maintaining uniform brightness across battery discharge. | Use Scenario: Powering edge-lit LED array in a 7–10 inch tablet display with tight height constraints and no room for inductors. IC Role / Device Role / Timing Role: Fractional (2:3) charge pump generating ~4.5V from 3.3V rail to bias white LEDs with minimal ripple. Use Value: Enables fully ceramic solution (no inductors) with 1.5MHz operation, reducing EMI and allowing thinner mechanical stack-up than boost converters. |
| Portable Medical Display | Industrial Handheld Terminal |
Use Scenario: Illuminating high-reliability monochrome LCD in battery-operated medical device requiring stable light output over temperature. IC Role / Device Role / Timing Role: Regulated current source with thermal shutdown and short-circuit survival for fault-tolerant operation. Use Value: Maintains consistent LED intensity from –40°C to +85°C with ±0.5% FB voltage drift, ensuring diagnostic readability in field conditions. | Use Scenario: Backlighting ruggedized industrial terminal display exposed to vibration, wide temperature swings, and intermittent power. IC Role / Device Role / Timing Role: Low-noise, inductorless DC/DC converter immune to magnetic interference and mechanical stress. Use Value: Eliminates inductor failure modes (saturation, microphonics) while delivering 125mA with <35mV load transient deviation due to 0.35Ω closed-loop output resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3201EMS#TRPBF | 1.7MHz switching frequency; 6.5mA operating current; same 10-pin MSOP package and pinout. | Higher quiescent current; slightly faster response but marginally higher noise than LTC3202EMS#TRPBF. | Choose LTC3201EMS#TRPBF only if system-level timing or transient response demands >1.5MHz operation and higher IQ is acceptable. |
| LTC3200EMS#TRPBF | 2MHz switching frequency; 8mA operating current; same package and pin-compatible interface. | Higher switching loss and IQ reduce efficiency at light loads; less suitable for ultra-low-power standby. | Prefer LTC3200EMS#TRPBF when maximum capacitor size reduction is critical and 2MHz allows smaller CFLY, accepting higher IQ penalty. |
Compared with LTC3201EMS#TRPBF and LTC3200EMS#TRPBF, the LTC3202EMS#TRPBF offers the lowest operating current (2.5mA typ) and best noise-performance trade-off at 1.5MHz - making it optimal for battery runtime-sensitive portable displays where moderate switching speed suffices.
Availability
LTC3202EMS#TRPBF is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display drivers, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3202EMS#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3202 series.
The LTC3202EMS#TRPBF belongs to Linear's precision charge pump LED driver family, engineered specifically for low-noise, inductorless white LED backlighting in space- and power-constrained portable electronics.
FAQ
What is the primary function of the LTC3202EMS#TRPBF?
The LTC3202EMS#TRPBF is a low-noise, constant-frequency fractional charge pump DC/DC converter optimized for white LED backlighting. It regulates either output current (for LED brightness control) or output voltage using an internal 2-bit DAC and feedback loop. Its core function is to efficiently boost input voltage up to ~1.5×VIN without inductors, delivering up to 125mA with <1µA shutdown current - making it ideal for battery-powered portable displays.
How does the LTC3202EMS#TRPBF achieve LED current regulation?
The LTC3202EMS#TRPBF achieves LED current regulation by sensing voltage across an external sense resistor connected between VOUT and the LED cathodes. The FB pin compares this voltage to one of three programmable internal reference voltages (0.2V, 0.4V, or 0.6V) set by D0/D1 logic inputs. The control loop adjusts charge pump strength to maintain the selected FB voltage, thereby regulating ILED = VFB/Rsense. This method provides stable, temperature-compensated current control without external op-amps or PWM dimming circuitry.
Can the LTC3202EMS#TRPBF be used in voltage regulation mode?
Yes, the LTC3202EMS#TRPBF supports voltage regulation mode using a resistive divider from VOUT to GND, with the FB pin connected to the divider midpoint. The output voltage is calculated as VOUT = VFB × (1 + R1/R2), where VFB is the selected 0.2V/0.4V/0.6V reference. Higher VFB settings yield lower closed-loop output resistance (~0.35Ω at 0.6V) and better load regulation. Voltage mode is suitable for powering analog circuits or sensors requiring stable low-noise bias from a single-cell battery.
What are the absolute maximum ratings for the LTC3202EMS#TRPBF?
The absolute maximum ratings for the LTC3202EMS#TRPBF are: VIN, VOUT to GND = –0.3V to 6V; D0/D1 inputs = –0.3V to VIN + 0.3V; continuous VOUT short-circuit duration = indefinite; maximum output current = 150mA (peak, not continuous). Exceeding these limits may impair device reliability. The MSOP package has TJMAX = 150°C and θJA = 120°C/W. Operation beyond 2.7V–4.5V VIN or exposure to >6V on VOUT risks permanent damage.
Does the LTC3202EMS#TRPBF require external components for basic operation?
Yes, the LTC3202EMS#TRPBF requires four external ceramic capacitors for basic operation: two 1µF flying capacitors (C1, C2) connecting C1+/C1– and C2+/C2–; one 1µF input bypass capacitor (CIN) from VIN to GND; and one 1µF output capacitor (COUT) from VOUT to GND. No inductors or diodes are needed. Optional components include a bleed resistor from VOUT to GND for zero-voltage shutdown and a 10nH PCB trace inductor on VIN for enhanced input noise rejection.
LTC3202EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 125mA
- Frequency:
- 1.5MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3202EMS#TRPBF FAQ
1.How can I place an order for LTC3202EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3202EMS#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 LTC3202EMS#TRPBF reliable?
The price and inventory of LTC3202EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3202EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3202EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3202EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3202EMS#TRPBF?
LTC3202EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3202EMS#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 LTC3202EMS#TRPBF?
For technical support, including LTC3202EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3202EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3202EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3202EMS#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 LTC3202EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3202EMS#TRPBF?
All LTC3202EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3202EMS#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 LTC3202EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3202EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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