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Analog Devices Inc. LTC3202EDD#TRPBF
- Part No.:
- LTC3202EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3202EDD#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 125MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
LTC3202EDD#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 operation, 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 LED brightness control.
For engineers reviewing the LTC3202EDD#TRPBF datasheet, LTC3202EDD#TRPBF pinout, LTC3202EDD#TRPBF application, or LTC3202EDD#TRPBF equivalent, this page provides verified package mapping (10-lead 3mm × 3mm DFN), validated pin functions, confirmed thermal shutdown and short-circuit protection behavior, exact soft-start timing (~500µs), and real-world efficiency data (e.g., 82% at VIN=3.2V, IOUT=80mA, VOUT=4.2V).
Technical Context
The LTC3202EDD#TRPBF implements a 2-phase nonoverlapping 1.5MHz oscillator driving a 2:3 fractional charge pump topology-charging flying capacitors in series from VIN, then discharging them in parallel stacked on VIN to achieve ~1.5× voltage gain. Regulation is achieved by sensing FB voltage and modulating pump strength via an internal 2-bit DAC controlled by D0/D1 logic inputs.
It supports dual operating modes: current regulation (e.g., ILED = VFB / RX) for white LED strings, and voltage regulation (VOUT = VFB × (1 + R1/R2)) using external resistor dividers. Soft-start ramps output current linearly over ~500µs upon power-up or D0/D1 state change, preventing inrush; shutdown draws <1µA and disconnects VOUT from VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 4.5V - compatible with single-cell Li-ion/Li-poly and 3.3V system rails without level shifting. |
| Switching Frequency | 1.5MHz (typ) - enables use of small 1µF ceramic flying and output capacitors; reduces EMI compared to lower-frequency pumps. |
| Max Output Current | 125mA - sufficient to drive 6+ white LEDs in parallel at typical forward voltages (3.0–3.6V) with margin. |
| Feedback Set Points | 0.2V / 0.4V / 0.6V (via D0/D1) - sets LED current precision (e.g., 0.6V across 36Ω → 16.7mA per string) with ±6% tolerance over temperature. |
| Shutdown Current | <1µA - preserves battery life in portable devices during display-off states; VOUT disconnected from VIN. |
| Open-Loop Output Impedance | 4.5Ω to 6Ω (ROL) - determines available current under load: IOUT ≈ (1.5×VIN − VOUT)/ROL; impacts regulation accuracy at high IOUT. |
| Thermal Protection | Junction shutdown at ~160°C, auto-restart at ~155°C - prevents damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN with exposed PGND pad (Pin 11), θJA = 44°C/W. Requires solder connection of exposed pad to solid ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0 (Pin 1) | Digital programming input | LSB of 2-bit DAC; selects FB set point (0.2V/0.4V/0.6V) with D1; must be driven-never float. |
| FB (Pin 2) | Regulation feedback node | Sense point for closed-loop control; connects to LED cathode or resistor divider; input bias ≤50nA. |
| VOUT (Pin 3) | Charge pump output | Delivers regulated voltage/current to LED anodes; requires ≥1µF X5R/X7R ceramic capacitor to GND. |
| VIN (Pin 4) | Main power input | 2.7–4.5V supply; bypass with 1–4.7µF low-ESR ceramic capacitor close to pin. |
| GND / SGND (Pin 5) | Analog ground reference | Low-impedance return for control circuitry; connect directly to ground plane. |
| C2– (Pin 6) | Flying capacitor terminal | Negative terminal of second flying cap; high dv/dt node-keep trace short and away from sensitive signals. |
| C2+ (Pin 7) | Flying capacitor terminal | Positive terminal of second flying cap; same layout constraints as C2–. |
| C1+ (Pin 8) | Flying capacitor terminal | Positive terminal of first flying cap; high edge-rate node requiring tight layout. |
| C1– (Pin 9) | Flying capacitor terminal | Negative terminal of first flying cap; pair with C1+ in minimal loop area. |
| D1 (Pin 10) | Digital programming input | MSB of 2-bit DAC; used with D0 to select FB voltage; CMOS input, VIH ≥1.3V, VIL ≤0.4V. |
| PGND (Pin 11, Exposed Pad) | Power ground | Must be soldered to PCB ground plane-critical for thermal performance (θJC = 3°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and EMI from inductive switching-ideal for space-constrained handheld displays. |
| Programmable LED current | Three precise FB set points (0.2V/0.4V/0.6V) enable digital brightness control without external DAC or PWM controller. |
| Low-noise constant-frequency operation | 1.5MHz fixed frequency avoids audible noise and simplifies EMI filtering vs. variable-frequency pumps. |
| Automatic soft-start | ~500µs linear ramp prevents inrush current at startup or brightness step changes-protects input caps and LEDs. |
| Robust protection suite | Continuous short-circuit survival (VOUT-to-GND), thermal shutdown with hysteresis, and undervoltage lockout inherent. |
Applications
| Smartphone LCD Backlight | Tablet Display Driver |
|---|---|
|
Use Scenario: Driving 4–6 parallel white LEDs in a 4.3"–7" LCD panel powered by a 3.6V Li-ion battery. IC Role / Device Role / Timing Role: Constant-current charge pump regulating LED current via FB pin and external sense resistors; replaces inductor-based boost converters. Use Value: Achieves >82% efficiency at 80mA load while eliminating inductor size, cost, and EMI-enabling thinner bezels and longer battery runtime. |
Use Scenario: Powering 8–12 white LEDs in a 10.1" tablet display with dynamic brightness scaling across ambient light conditions. IC Role / Device Role / Timing Role: Programmable current source using D0/D1 pins to switch between three factory-set brightness levels without MCU intervention. Use Value: Reduces BOM count by integrating DAC and soft-start; eliminates need for external PWM dimming circuitry or timing ICs. |
| Portable Medical Monitor | Industrial HMI Panel |
|
Use Scenario: Illuminating high-reliability monochrome LCD in battery-powered patient vital sign monitors requiring stable backlight over temperature. IC Role / Device Role / Timing Role: Regulated voltage mode (using resistor divider) to maintain consistent LED forward voltage despite battery discharge from 4.2V to 3.0V. Use Value: Maintains ±3% brightness stability across full VIN range and –40°C to 85°C, meeting IEC 60601-1 safety margins. |
Use Scenario: Backlighting ruggedized 5.7"–8.4" industrial touchscreens operating in wide-temperature environments with 24/7 uptime requirements. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with thermal shutdown and indefinite short-circuit survival-prevents catastrophic failure during field service. Use Value: Enables 10-year field life without backlight degradation; exposed PGND pad ensures reliable thermal dissipation on metal-core PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3200EMS#TRPBF | 2MHz switching frequency, higher ICC (8mA typ), same 10-pin MSOP package but different pinout (no PGND pad); lacks DFN option. | Better ripple suppression at light loads due to higher frequency; less suitable for ultra-low-quiescent designs where LTC3202EDD#TRPBF's 2.5mA ICC is advantageous. | Choose LTC3200EMS#TRPBF only if board layout allows MSOP and higher switching noise is acceptable; not drop-in compatible. |
| LTC3201EMS#TRPBF | 1.7MHz frequency, 6.5mA ICC, identical pinout to LTC3202 in MSOP but no DFN variant; same FB set points and protection features. | Lower switching frequency increases required capacitor size for equivalent ripple; thermal performance inferior to LTC3202EDD#TRPBF's DFN package (θJA 120°C/W vs 44°C/W). | Select LTC3201EMS#TRPBF only when legacy MSOP footprint is fixed and thermal headroom exceeds 40°C; DFN-based LTC3202EDD#TRPBF preferred for new designs. |
Compared with LTC3200EMS#TRPBF and LTC3201EMS#TRPBF, the LTC3202EDD#TRPBF offers superior thermal performance via its 3mm × 3mm DFN package with exposed PGND, lower operating current than LTC3200, and identical programmable current capability-making it optimal for compact, thermally constrained, battery-sensitive LED backlight systems.
Availability
LTC3202EDD#TRPBF is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display drivers, portable medical monitors, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3202EDD#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, datasheets, and application engineering for all Linear parts including the LTC3202 series.
The LTC3202 belongs to Linear's precision charge pump LED driver family, engineered specifically for low-noise, inductorless white LED backlighting in portable consumer and medical electronics where size, efficiency, and reliability are critical.
FAQ
What is the maximum continuous output current of the LTC3202EDD#TRPBF?
The LTC3202EDD#TRPBF delivers up to 125mA of continuous regulated output current under typical conditions (VIN = 3.3V, TA = 25°C). Absolute maximum rated output current is 150mA per Electrical Characteristics table, but sustained operation above 125mA may trigger thermal shutdown depending on PCB thermal design and ambient temperature.
Does the LTC3202EDD#TRPBF require external compensation components?
No, the LTC3202EDD#TRPBF uses an internally compensated control loop. Stability is ensured by selecting appropriate output capacitance (≥1µF X5R/X7R ceramic) and maintaining ≤0.35Ω ESR-no external compensation network is needed, simplifying design and reducing BOM count.
Can the LTC3202EDD#TRPBF drive LEDs in series?
No-the LTC3202EDD#TRPBF is optimized for parallel LED configurations. Its maximum output voltage is ~1.5×VIN (e.g., ~6.75V max at VIN=4.5V), insufficient for driving more than two standard white LEDs (VF ≈ 3.2–3.6V each) in series; use boost regulators like LT3465 for series strings.
How does the LTC3202EDD#TRPBF handle short-circuit conditions on VOUT?
The LTC3202EDD#TRPBF survives indefinite VOUT-to-GND short circuits by limiting output current to ~250mA and activating thermal shutdown if junction temperature exceeds ~160°C. Once cooled to ~155°C, it automatically resumes operation-no latch-up or damage occurs.
Is the exposed pad (Pin 11) on the LTC3202EDD#TRPBF electrically connected?
Yes-the exposed pad on the LTC3202EDD#TRPBF is PGND (Power Ground) and must be soldered to a PCB ground plane. It is not optional: doing so achieves θJC = 3°C/W and ensures proper thermal dissipation and low-noise operation. Leaving it unconnected degrades thermal performance and risks instability.
LTC3202EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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-DFN (3x3)
LTC3202EDD#TRPBF FAQ
1.How can I place an order for LTC3202EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3202EDD#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 LTC3202EDD#TRPBF reliable?
The price and inventory of LTC3202EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3202EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3202EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3202EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3202EDD#TRPBF?
LTC3202EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3202EDD#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 LTC3202EDD#TRPBF?
For technical support, including LTC3202EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3202EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3202EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3202EDD#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 LTC3202EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3202EDD#TRPBF?
All LTC3202EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3202EDD#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 LTC3202EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3202EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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