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Analog Devices Inc. LTC3203EDD#PBF
- Part No.:
- LTC3203EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3203EDD#PBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,647
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Product details
Overview
LTC3203EDD#PBF from Analog Devices (formerly Linear Technology) is a low-noise, high-efficiency 1.5x/2x fractional charge pump DC/DC converter delivering up to 500mA output current from 2.7V–5.5V input. It features selectable fixed 4.5V or 5V output (via VSEL pin), Burst Mode operation (~120µA quiescent current), and integrated short-circuit/thermal protection. Designed for LED backlighting in compact handheld devices.
For engineers reviewing the LTC3203EDD#PBF datasheet, LTC3203EDD#PBF pinout, LTC3203EDD#PBF application, or LTC3203EDD#PBF equivalent, key selection criteria include output voltage programmability (4.5V/5V), dual-mode efficiency trade-offs (Burst vs constant-frequency), thermal performance in 3mm × 3mm DFN, and compatibility with ceramic flying capacitors (2.2µF).
Technical Context
The LTC3203EDD#PBF implements a two-phase non-overlapping switched-capacitor architecture with internal 1.5x and 2x conversion modes selected via the MODE pin. Its control loop regulates output by comparing FB/VSEL-referenced voltage against a 0.91V internal reference and modulating charge pump current.
Burst Mode operation (LTC3203/LTC3203-1 variant) dynamically disables the oscillator under light load to reduce quiescent current to ~120µA, while soft-start limits inrush current over ~250µs. Input and output ripple are minimized using out-of-phase flying capacitor switching and low-ESR ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion and 3.3V logic rails without external LDO pre-regulation. |
| Output Current | Up to 500mA - sufficient for driving multiple white LEDs or powering USB OTG peripherals. |
| Output Voltage Options | 4.5V or 5V (fixed, user-selectable via VSEL pin) - optimized for LED forward voltage or 5V logic interface compliance. |
| Quiescent Current | ~120µA in Burst Mode - extends battery life in standby or low-power display states. |
| Switching Frequency | 0.9MHz (1.5x mode) or 1.0MHz (2x mode) - enables use of small 2.2µF ceramic flying capacitors and reduces EMI filtering burden. |
| Shutdown Current | <1µA - isolates load from input during system sleep, critical for ultra-low-power portable designs. |
| Package | 10-pin 3mm × 3mm DFN with exposed thermal pad - provides low thermal resistance (θJC = 3°C/W) for high-current operation in space-constrained PCBs. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C2+ (Pin 1) | Flying capacitor 2 positive terminal | Connects to positive side of second 2.2µF ceramic flying capacitor; polarity reversal during operation mandates non-polarized ceramic type. |
| VOUT (Pin 2) | Regulated output voltage | Delivers fixed 4.5V or 5V output; requires ≥4.7µF low-ESR ceramic bypass capacitor placed adjacent to pin for stability and ripple suppression. |
| C1+ (Pin 3) | Flying capacitor 1 positive terminal | Connects to positive side of first 2.2µF ceramic flying capacitor; shares same polarity constraints as C2+. |
| SHDN (Pin 4) | Active-low shutdown input | Pulling low disables charge pump and disconnects VOUT from VIN; must be actively driven-never left floating. |
| VSEL (Pin 5) | Output voltage selection input | Logic 0 → 4.5V output; logic 1 → 5V output; used exclusively on LTC3203-1/LTC3203B-1 variants like LTC3203EDD#PBF. |
| MODE (Pin 6) | Conversion mode selection | VMODEH > 0.874V → 1.5x mode (higher efficiency); VMODEL < 0.852V → 2x mode (higher output current); hysteresis prevents oscillation. |
| VIN (Pin 7) | Input supply voltage | Accepts 2.7V–5.5V input; requires ≥2.2µF low-ESR ceramic bypass capacitor to GND for noise reduction and transient response. |
| C2– (Pin 8) | Flying capacitor 2 negative terminal | Connects to negative side of second flying capacitor; forms charge-transfer path with C2+ during clock phases. |
| GND (Pin 9) | Ground reference | Primary signal ground connection; must tie directly to low-impedance PCB ground plane. |
| C1– (Pin 10) | Flying capacitor 1 negative terminal | Connects to negative side of first flying capacitor; completes charge-transfer loop with C1+. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB copper pour for thermal dissipation (θJC = 3°C/W) and optimal EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode charge pump (1.5x/2x) | Enables efficiency optimization: 1.5x mode achieves >90% efficiency at moderate loads; 2x mode delivers higher output current at lower input voltages. |
| User-selectable 4.5V/5V output | Eliminates need for external feedback resistors-simplifies BOM and layout for LED backlight (4.5V) or USB OTG (5V) applications. |
| Burst Mode operation | Reduces no-load input current to ~120µA, extending battery runtime in display-sleep states without sacrificing startup speed. |
| Integrated protection | Short-circuit current limit (~1A) and thermal shutdown (>150°C) prevent damage during fault conditions-no external circuitry required. |
| Low-noise constant-frequency option | Compatible with LTC3203B/LTC3203B-1 variants; LTC3203EDD#PBF uses Burst Mode but shares same low-ripple architecture via out-of-phase flying caps. |
Applications
| Cellphone LED Backlight | USB OTG Power Supply |
|---|---|
Use Scenario: Driving 3–6 white LEDs in series for main display backlight in smartphones and PDAs. IC Role / Device Role / Timing Role: Fixed-output (4.5V) charge pump providing regulated current source via external sense resistor; replaces inductor-based boost converters. Use Value: Enables thin form factor (no inductor), low EMI, and high efficiency (>85% at 300mA) across Li-ion battery discharge range (4.2V→3.0V). | Use Scenario: Providing stable 5V power to USB peripherals (e.g., flash drives, keyboards) when host device operates in OTG mode. IC Role / Device Role / Timing Role: Fixed 5V output charge pump acting as portable 5V rail generator from single-cell battery or 3.3V system rail. Use Value: Delivers full 500mA at 5V with <1% load regulation-meets USB 2.0 power delivery spec without requiring buck-boost topology. |
| Camera Flash LED Driver | Portable Medical Sensor Bias |
Use Scenario: Supplying pulsed 5V bias to high-brightness camera flash LEDs in mobile devices. IC Role / Device Role / Timing Role: Fast-transient 5V charge pump supporting burst-mode LED current pulses up to 500mA peak. Use Value: Achieves <20µs load transient recovery (20%–80% VOUT) with minimal overshoot-critical for consistent flash intensity and image quality. | Use Scenario: Generating precise 4.5V bias for analog front-end ICs (e.g., ADC references, op-amp supplies) in battery-powered diagnostic tools. IC Role / Device Role / Timing Role: Low-noise, fixed 4.5V charge pump replacing linear regulators to improve efficiency in multi-rail sensor subsystems. Use Value: Reduces thermal load by >60% vs. LDO solution at 200mA load-extends battery life and avoids sensor drift from self-heating. |
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 |
|---|---|---|---|
| TPS60230RGTR | Fixed 5V output only; 400mA max output; 1MHz switching frequency; no VSEL pin for 4.5V option. | Limited to 5V-only systems; lower current headroom for multi-LED arrays. | Select when 5V-only operation suffices and board space allows slightly larger 16-pin QFN package. |
| MAX682EUT+T | Adjustable output (1.5×VIN) via feedback divider; 250mA max output; no Burst Mode; higher quiescent current (~300µA). | Suitable for variable-voltage bias rails but not fixed 4.5V/5V LED drivers. | Prefer when output voltage tuning is required and load current remains ≤250mA. |
Compared with TPS60230RGTR and MAX682EUT+T, the LTC3203EDD#PBF uniquely combines dual fixed outputs (4.5V/5V), 500mA capability, and Burst Mode efficiency-making it optimal for space-constrained, battery-sensitive LED and OTG applications where flexibility and low IQ are critical.
Availability
LTC3203EDD#PBF is available at Aetrix Electronics and suitable for cellphone LED backlighting, USB OTG power delivery, and portable medical sensor biasing requiring stable component supply and long-term production continuity.
Supply support for LTC3203EDD#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3203 family was designed specifically for low-noise, high-efficiency charge pump conversion in battery-powered portable electronics-emphasizing minimal external components, thermal robustness in DFN packages, and seamless integration with LED and USB subsystems.
FAQ
What output voltage options does the LTC3203EDD#PBF support?
The LTC3203EDD#PBF supports two fixed output voltages: 4.5V (when VSEL = 0V) and 5V (when VSEL = VIN). This selection is made via the VSEL pin and eliminates the need for external feedback resistors-simplifying design for LED backlighting (4.5V) or USB OTG (5V) applications. The LTC3203EDD#PBF does not support adjustable output voltage.
Does the LTC3203EDD#PBF use Burst Mode or constant-frequency operation?
The LTC3203EDD#PBF uses Burst Mode operation to minimize quiescent current at light loads, achieving ~120µA no-load input current. This differs from the LTC3203B/LTC3203B-1 variants, which operate at constant frequency for lowest noise. Burst Mode improves battery life in display-sleep states while maintaining fast wake-up response.
What are the absolute maximum ratings for the LTC3203EDD#PBF?
The LTC3203EDD#PBF has an absolute maximum input/output voltage rating of –0.3V to 6V relative to GND, SHDN/MODE/VSEL inputs rated to VIN +0.3V, and indefinite VOUT short-circuit duration. Operating temperature is specified from –40°C to +85°C, with junction temperature limited to 125°C maximum. Exceeding these ratings may cause permanent damage.
Can the LTC3203EDD#PBF drive 500mA continuously in both 1.5x and 2x modes?
Yes-the LTC3203EDD#PBF delivers up to 500mA continuous output current in both 1.5x and 2x modes, though with different trade-offs: 1.5x mode offers higher efficiency (>90% typical) at moderate loads and higher input voltages, while 2x mode provides greater output current capability at lower VIN (e.g., 2.7V–3.3V) and lower output ripple due to out-of-phase flying capacitor operation.
What capacitor types are required for the flying capacitors in the LTC3203EDD#PBF?
The LTC3203EDD#PBF requires non-polarized, low-ESR ceramic capacitors (X5R/X7R dielectric) for both flying capacitors (C1 and C2), each rated at minimum 2.2µF. Polarized capacitors (tantalum, aluminum) are strictly prohibited due to voltage reversal during startup, which could cause catastrophic failure. AVX, Murata, and TDK offer qualified 0805/1206 case sizes meeting these requirements.
LTC3203EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3203EDD#PBF FAQ
1.How can I place an order for LTC3203EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3203EDD#PBF 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 LTC3203EDD#PBF reliable?
The price and inventory of LTC3203EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3203EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3203EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3203EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3203EDD#PBF?
LTC3203EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3203EDD#PBF 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 LTC3203EDD#PBF?
For technical support, including LTC3203EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3203EDD#PBF requirements.
6.How does Aetrix verify that LTC3203EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3203EDD#PBF 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 LTC3203EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3203EDD#PBF?
All LTC3203EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3203EDD#PBF, 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 LTC3203EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3203EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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