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Analog Devices Inc. LTC3203BEDD#TRPBF
- Part No.:
- LTC3203BEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3203BEDD#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,075
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Product details
Overview
LTC3203BEDD#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, constant-frequency charge pump DC/DC converter optimized for LED backlight and camera flash power in portable devices. It delivers up to 500mA output current from 2.7V–5.5V input, operates at fixed 0.9MHz (1.5×) or 1.0MHz (2×) switching frequency, and features user-selectable 4.5V or 5V fixed output via VSEL pin - ideal for white LED biasing and USB OTG supply rails.
For engineers reviewing the LTC3203BEDD#TRPBF datasheet, LTC3203BEDD#TRPBF pinout, LTC3203BEDD#TRPBF application, or LTC3203BEDD#TRPBF equivalent, key selection criteria include its constant-frequency low-noise operation (vs. Burst Mode variants), thermal shutdown protection, 10-pin 3mm × 3mm DFN package with exposed pad, and dual-mode voltage conversion (1.5×/2×) controlled by the MODE pin.
Technical Context
The LTC3203BEDD#TRPBF implements a switched-capacitor charge pump architecture with non-overlapping two-phase clocking. It supports both 1.5× (0.9MHz) and 2× (1.0MHz) voltage conversion modes, selected via the MODE pin's voltage threshold (VMODEH = 0.91V typ, VMODEL = 0.82V typ). Unlike Burst Mode variants, it maintains constant frequency across all load conditions to minimize EMI and output ripple.
It uses an internal 0.91V reference and VSEL pin (not FB) to select between 4.5V (±4%) or 5V (±4%) regulated output - no external feedback divider required. Built-in soft-start limits inrush current over ~250µs, and short-circuit protection limits output current to ~1A while thermal shutdown activates at ~150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - supports single-cell Li-ion (3.0–4.2V) and USB 5V input without LDO pre-regulation. |
| VOUT Options | 4.5V or 5V (user-selectable via VSEL pin) - ±4% tolerance ensures stable white LED current or logic rail compliance. |
| Max Output Current | 500mA - sufficient for driving 4–6 parallel white LEDs at 100mA each in backlight applications. |
| Switching Frequency | 0.9MHz (1.5× mode) or 1.0MHz (2× mode) - enables use of small 2.2µF ceramic flying capacitors and reduces EMI filtering burden. |
| Shutdown Current | <1µA - preserves battery life during system sleep; VOUT disconnected from VIN in shutdown. |
| Thermal Protection | Junction shutdown at ~150°C, restart at ~135°C - prevents damage under sustained overload or poor PCB thermal design. |
| Package | 10-pin 3mm × 3mm DFN with exposed pad (Pin 11 = GND) - requires soldered thermal pad for θJA = 44°C/W rating. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C2+ (Pin 1) | Flying capacitor C2 positive terminal | Connects to + side of second 2.2µF ceramic flying cap; polarity reversal during operation mandates non-polarized ceramic only. |
| VOUT (Pin 2) | Regulated output voltage | Delivers 4.5V or 5V; requires ≥4.7µF low-ESR ceramic bypass cap placed adjacent to pin for stability and ripple control. |
| C1+ (Pin 3) | Flying capacitor C1 positive terminal | Connects to + side of first 2.2µF ceramic flying cap; same polarity constraints as C2+. |
| SHDN (Pin 4) | Active-low shutdown control | Pull low to disable converter; draws <1µA in shutdown; must not be left floating (CMOS input). |
| VSEL (Pin 5) | Output voltage selection | Logic 0 → 4.5V output; logic 1 → 5V output; internal pull-down ensures default 4.5V if unconnected. |
| MODE (Pin 6) | Conversion mode selection | Voltage >0.91V → 1.5× mode (higher efficiency); <0.82V → 2× mode (higher output current); hysteresis prevents chatter. |
| VIN (Pin 7) | Input supply voltage | Accepts 2.7–5.5V; requires ≥2.2µF low-ESR ceramic bypass cap to GND close to pin to suppress input ripple. |
| C2– (Pin 8) | Flying capacitor C2 negative terminal | Connects to – side of second flying cap; forms charge-transfer path with C2+ and internal switches. |
| GND (Pin 9) | Signal ground reference | Primary ground return; must connect to low-impedance PCB ground plane; ties to exposed pad (Pin 11). |
| C1– (Pin 10) | Flying capacitor C1 negative terminal | Connects to – side of first flying cap; works in tandem with C1+ and internal clock phases. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency operation | Eliminates audible noise and simplifies EMI filtering vs. Burst Mode - critical for camera flash and audio-sensitive systems. |
| Dual-mode voltage conversion | 1.5× (0.9MHz) or 2× (1.0MHz) selectable via MODE pin - enables optimization for efficiency (1.5× at higher VIN) or output current (2× at lower VIN). |
| User-selectable fixed output | 4.5V for white LED forward voltage matching or 5V for USB OTG host power - no external resistors or compensation needed. |
| Integrated thermal & short-circuit protection | Auto-recovering shutdown at ~150°C junction temp and ~1A output limit - ensures robustness in handheld device thermal envelopes. |
| Soft-start with 250µs ramp | Prevents inrush current spikes into input caps and avoids brown-out on shared battery rails during power-up. |
Applications
| High-Current LED Backlight | Cellphone Camera Flash |
|---|---|
Use Scenario: Driving 4–6 parallel white LEDs in smartphone LCD backlight with uniform brightness and minimal ripple. IC Role / Device Role / Timing Role: Constant-current LED driver using VOUT as bias rail; MODE pin set for 1.5× mode to maximize efficiency at typical 3.6V Li-ion voltage. Use Value: Delivers 500mA at 4.5V with <10mVpp ripple (1.5× mode, 10µF COUT), enabling flicker-free display operation without additional filtering. | Use Scenario: Providing high-current burst power for xenon or high-brightness LED camera flash in mobile handsets. IC Role / Device Role / Timing Role: High-peak-current voltage source; VSEL set to 5V, MODE forced to 2× mode for maximum available current during short flash pulses. Use Value: Sustains 500mA at 5V from 3.0V input (2× mode), eliminating need for bulky inductors and enabling compact flash module integration. |
| USB On-The-Go (OTG) Supply | Li-ion to 5V Logic Rail Conversion |
Use Scenario: Powering USB peripheral devices (e.g., flash drives, keyboards) from smartphone battery in OTG mode. IC Role / Device Role / Timing Role: Regulated 5V supply with fast transient response; SHDN controlled by USB detection logic to enable/disable on demand. Use Value: Meets USB 2.0 5V ±5% spec with <1% load regulation (0.37mV/mA), supporting hot-plug compatibility without host-side voltage sag. | Use Scenario: Generating clean 5V rail for microcontroller, sensors, or interface ICs from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Primary system power converter; VSEL = 5V, MODE biased for 1.5× mode above 3.3V VIN to maintain >85% efficiency across battery discharge. Use Value: Achieves 89% peak efficiency at 300mA (VIN = 3.6V, VOUT = 5V, 1.5× mode), reducing thermal load vs. linear regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3203EDD#TRPBF | Burst Mode operation (IQ ≈ 120µA), not constant frequency; identical pinout and package. | Better light-load efficiency but higher output ripple and potential EMI concerns in noise-sensitive imaging systems. | Select LTC3203EDD#TRPBF only when ultra-low quiescent current dominates over noise/ripple requirements. |
| LTC3203B-1EDD#TRPBF | Same constant-frequency operation and VSEL functionality, but rated for –40°C to 85°C industrial temp range (vs. 0°C to 85°C for LTC3203BEDD#TRPBF). | Suitable for extended-temperature industrial handhelds or automotive infotainment displays where ambient exceeds 0°C minimum. | Choose LTC3203B-1EDD#TRPBF when full –40°C startup and operation is required; otherwise LTC3203BEDD#TRPBF suffices for consumer-grade devices. |
Compared with LTC3203EDD#TRPBF, the LTC3203BEDD#TRPBF trades light-load efficiency for superior EMI performance and tighter output regulation under dynamic loads; compared with LTC3203B-1EDD#TRPBF, it offers identical electrical behavior but with reduced temperature qualification - making it optimal for cost-sensitive consumer electronics with standard ambient operating ranges.
Availability
LTC3203BEDD#TRPBF is available at Aetrix Electronics and suitable for high-current LED backlighting, cellphone camera flash, and USB OTG power delivery requiring stable component supply and consistent DFN package sourcing.
Supply support for LTC3203BEDD#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, Inc. (ADI) acquired Linear Technology in 2017 and maintains its legacy precision analog and power management portfolio with rigorous characterization and long-term product support.
The LTC3203B series belongs to ADI's low-noise, high-efficiency charge pump family designed specifically for space-constrained, battery-powered portable electronics where inductorless step-up conversion and EMI control are critical.
FAQ
What is the key functional difference between LTC3203BEDD#TRPBF and LTC3203EDD#TRPBF?
The LTC3203BEDD#TRPBF operates exclusively in constant-frequency mode (0.9MHz/1.0MHz) for low-noise performance, while the LTC3203EDD#TRPBF uses Burst Mode at light loads to achieve ~120µA quiescent current. Both share identical pinout, package, and VSEL-based 4.5V/5V output selection. The LTC3203BEDD#TRPBF is preferred in camera, audio, and display applications where EMI and output ripple must be minimized.
Can LTC3203BEDD#TRPBF be used to drive white LEDs directly?
Yes - the LTC3203BEDD#TRPBF is commonly used to bias white LED strings. With VSEL set to logic 0, it delivers a tightly regulated 4.5V output (±4%), matching typical forward voltage of 3–4 white LEDs in series. For constant-current operation, pair it with an external current-sense resistor and feedback configuration per Figure 2 in the datasheet, though the standard 4.5V/5V fixed-output mode suffices for many parallel LED arrays.
What are the absolute maximum ratings for VIN and VOUT on LTC3203BEDD#TRPBF?
The absolute maximum rating for VIN and VOUT relative to GND is –0.3V to 6V. Exceeding 6V may cause permanent damage. The device is specified for continuous operation from 2.7V to 5.5V input, and output is regulated at either 4.5V or 5V. VOUT short-circuit duration is indefinite due to built-in current limiting (~1A) and thermal protection.
Is external feedback compensation required when using the VSEL pin on LTC3203BEDD#TRPBF?
No - the VSEL pin selects between two factory-trimmed internal feedback dividers for 4.5V or 5V output, eliminating need for external resistors or compensation components. This contrasts with the FB-pin variants (e.g., LTC3203B), which require an external R1/R2 divider and optional 5pF compensation capacitor (CFB) for stability when programming arbitrary output voltages.
How should the exposed thermal pad (Pin 11) of LTC3203BEDD#TRPBF be handled on the PCB?
The exposed pad (Pin 11) is electrically GND and thermally critical. It must be soldered to a dedicated PCB copper pour connected to the main ground plane using ≥4 thermal vias (0.3mm diameter) to inner/ground layers. Insufficient soldering or missing vias will degrade thermal resistance (θJA rises from 44°C/W), risking thermal shutdown under 500mA load at elevated ambient temperatures.
LTC3203BEDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.91V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 500mA
- Frequency - Switching:
- 900kHz, 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3203BEDD#TRPBF FAQ
1.How can I place an order for LTC3203BEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3203BEDD#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 LTC3203BEDD#TRPBF reliable?
The price and inventory of LTC3203BEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3203BEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3203BEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3203BEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3203BEDD#TRPBF?
LTC3203BEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3203BEDD#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 LTC3203BEDD#TRPBF?
For technical support, including LTC3203BEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3203BEDD#TRPBF requirements.
6.How does Aetrix verify that LTC3203BEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3203BEDD#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 LTC3203BEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3203BEDD#TRPBF?
All LTC3203BEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3203BEDD#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 LTC3203BEDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3203BEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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