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Analog Devices Inc. LTC3203BEDD#PBF
- Part No.:
- LTC3203BEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3203BEDD#PBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,489
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Product details
Overview
LTC3203BEDD#PBF from Analog Devices (formerly Linear Technology) is a low-noise, constant-frequency charge pump DC/DC converter optimized for LED backlight and camera flash supply in portable electronics. It delivers up to 500mA output current from 2.7V–5.5V input, operates in selectable 1.5× or 2× boost mode, features user-selectable 4.5V/5V fixed output via VSEL pin, and integrates short-circuit and thermal protection in a 10-pin 3mm × 3mm DFN package.
For engineers reviewing the LTC3203BEDD#PBF datasheet, LTC3203BEDD#PBF pinout, LTC3203BEDD#PBF application, or LTC3203BEDD#PBF equivalent, key selection criteria include fixed-output voltage selection logic, constant-frequency noise performance (0.9MHz/1.0MHz), open-loop output resistance (1.5–3.0Ω), shutdown current (<1µA), and compatibility with ceramic flying capacitors (2.2µF each).
Technical Context
The LTC3203BEDD#PBF implements a switched-capacitor charge pump architecture with non-overlapping two-phase clocking at 0.9MHz (1.5× mode) or 1.0MHz (2× mode). Its MODE pin accepts analog threshold control to dynamically switch between modes based on input voltage, enabling efficiency-optimized operation across varying battery states.
Unlike the Burst Mode variants (LTC3203/LTC3203-1), the "B" suffix denotes constant-frequency operation across all load conditions-eliminating low-frequency ripple and simplifying EMI filtering. The VSEL pin directly selects 4.5V or 5V regulated output without external resistors, while internal 0.91V reference and error amplifier maintain tight regulation under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - supports single-cell Li-ion (2.7V cutoff) through USB 5V input without external LDO pre-regulation. |
| VOUT Options | 4.5V or 5V (user-selectable via VSEL pin) - 4.5V matches white LED forward voltage; 5V powers logic rails or USB OTG peripherals. |
| Max Output Current | 500mA - sufficient for driving 4–6 parallel white LEDs or powering high-current PMIC subsystems. |
| Oscillator Frequency | 0.9MHz (1.5× mode) / 1.0MHz (2× mode) - enables use of compact 2.2µF ceramic flying capacitors and minimizes audible noise. |
| Shutdown Current | <1µA - preserves battery life during system sleep; VOUT disconnected from VIN in shutdown. |
| Open-Loop ROL | 1.5Ω (1.5× mode, VIN=3.6V, VOUT=4.5V) to 3.0Ω (2× mode, VIN=2.7V, VOUT=4.5V) - determines minimum achievable load regulation and maximum stable output current. |
| Thermal Protection | Junction shutdown at ~150°C, auto-restart at ~135°C - prevents damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for thermal 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 switching requires non-polarized capacitor. |
| VOUT (Pin 2) | Regulated output voltage | Must be bypassed with ≥4.7µF low-ESR ceramic capacitor; output impedance <0.27Ω (closed-loop, 1.5× mode) ensures tight load regulation. |
| C1+ (Pin 3) | Flying capacitor C1 positive terminal | Connects to + side of first 2.2µF ceramic flying cap; operates out-of-phase with C2+ to minimize input/output ripple. |
| SHDN (Pin 4) | Active-low shutdown control | Pulling low disables charge pump and disconnects VOUT from VIN; must not float; CMOS-compatible with 0.4V/1.3V logic thresholds. |
| VSEL (Pin 5) | Output voltage selection input | 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 threshold (0.788–0.946V) selects 1.5× (high) or 2× (low) boost ratio; supports resistor-divider programming for VIN-dependent mode switching. |
| VIN (Pin 7) | Input supply voltage | Requires ≥2.2µF low-ESR ceramic bypass; supplies both charge pump and internal circuitry; input current remains nearly constant during switching phases. |
| C2– (Pin 8) | Flying capacitor C2 negative terminal | Connects to – side of second flying capacitor; shares ground path with C1– and exposed pad. |
| GND (Pin 9) | Power and signal ground | Low-impedance connection point for all ground returns; must tie directly to PCB ground plane. |
| C1– (Pin 10) | Flying capacitor C1 negative terminal | Connects to – side of first flying capacitor; forms return path for charge transfer cycles. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB copper area ≥30mm² for θJA = 44°C/W; electrically connected to internal GND. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency operation | Eliminates low-frequency Burst Mode ripple; simplifies EMI filter design and avoids audio-band noise in sensitive analog circuits. |
| User-selectable dual output voltage | 4.5V/5V selection via single logic-level VSEL pin - no external resistors needed, reducing BOM count and layout complexity. |
| Programmable 1.5×/2× conversion mode | MODE pin accepts analog voltage divider to auto-switch modes based on VIN - optimizes efficiency vs. output current trade-off across battery discharge curve. |
| Integrated soft-start | 250µs linear output ramp limits inrush current into large output capacitors - prevents input rail droop and protects upstream power sources. |
| Robust protection suite | Short-circuit current limit (~1A), thermal shutdown with hysteresis, and shutdown disconnect ensure safe operation under fault conditions. |
Applications
| High-Current LED Backlight Supply | Cellphone Camera Flash Supply |
|---|---|
Use Scenario: Powering 4–6 parallel white LEDs in smartphone LCD backlight with dynamic brightness control. IC Role / Device Role / Timing Role: Constant-current LED driver front-end supplying regulated 4.5V to external current-sense IC or PWM-controlled LED string. Use Value: Delivers 500mA at 4.5V with <0.27Ω closed-loop output resistance, ensuring ≤27mV output shift for 100mA load steps - critical for flicker-free dimming. |
Use Scenario: Providing burst-mode 5V flash power for cellphone camera modules requiring high peak current (≥300mA) and fast turn-on. IC Role / Device Role / Timing Role: High-efficiency voltage booster enabling rapid LED flash activation from single-cell Li-ion battery (2.7–4.2V). Use Value: Constant-frequency 1.0MHz operation ensures predictable timing and minimal delay between flash trigger and full illumination - no Burst Mode latency. |
| USB On-The-Go (OTG) Power Supply | Li-Ion to 5V Logic Rail Converter |
Use Scenario: Generating stable 5V from smartphone battery to power USB peripherals (keyboards, storage) in OTG mode. IC Role / Device Role / Timing Role: Compact, low-noise 5V supply meeting USB 2.0 voltage tolerance (4.75–5.25V) with fast transient response. Use Value: VSEL = high configures precise 5V output (4.8–5.2V over load/temp); <1µA shutdown current extends host device battery life during peripheral idle periods. |
Use Scenario: Converting 3.0–4.2V Li-ion battery voltage to clean 5V for microcontroller, sensor, or interface IC logic rails. IC Role / Device Role / Timing Role: Primary DC/DC converter replacing inefficient linear regulators or larger inductor-based buck-boost solutions. Use Value: 10-pin DFN (3mm × 3mm) footprint saves >50% board area vs. comparable inductor-based converters; ceramic-only design eliminates magnetic EMI. |
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 |
|---|---|---|---|
| MAX8647ETE+ | Fixed 5V output only; no VSEL or MODE pin; 400mA max output; 1.2MHz switching frequency. | Lacks dual-voltage flexibility and programmable mode switching; suited for simpler 5V-only systems with lower current demand. | Select when 5V-only operation and <400mA load suffice, and board space allows slightly larger 16-pin TQFN package. |
| TPS60403DBVR | Fixed 5V output; 280mA max; 1.0MHz; no thermal shutdown; requires external flying caps but no VSEL/MODE pins. | No overtemperature or short-circuit protection; limited output current restricts use to low-power logic rails only. | Choose only for cost-sensitive, low-current (≤280mA), non-safety-critical 5V generation where protection features are omitted. |
Compared with MAX8647ETE+ and TPS60403DBVR, the LTC3203BEDD#PBF provides unique dual-output voltage selection, robust protection, and higher 500mA output capability in the smallest footprint - making it optimal for space-constrained, multi-rail portable designs requiring reliability and flexibility.
Availability
LTC3203BEDD#PBF is available at Aetrix Electronics and suitable for high-current LED backlighting, cellphone camera flash, USB OTG power delivery, and Li-ion-to-5V logic rail conversion requiring stable component supply and long-term production continuity.
Supply support for LTC3203BEDD#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, serving precision instrumentation, communications, automotive, and industrial markets.
The LTC3203BEDD#PBF belongs to Linear's legacy charge pump DC/DC converter family, designed specifically for ultra-compact, low-noise, high-efficiency power conversion in battery-powered portable electronics where inductor-free solutions are mandatory.
FAQ
What is the key functional difference between LTC3203BEDD#PBF and LTC3203EDD#PBF?
The LTC3203BEDD#PBF operates exclusively in constant-frequency mode across all load conditions, delivering lowest noise and predictable EMI behavior. In contrast, the LTC3203EDD#PBF uses Burst Mode operation at light loads to achieve ~120µA quiescent current - trading off low-frequency ripple for higher efficiency in standby. Both share identical pinout, package, and VSEL-based 4.5V/5V selection, but their control architectures target distinct noise-sensitive vs. ultra-low-power applications.
Can LTC3203BEDD#PBF drive white LEDs directly without an external current regulator?
No - the LTC3203BEDD#PBF is a regulated voltage source, not a constant-current LED driver. To drive white LEDs, it must supply a stable 4.5V or 5V rail to an external current-regulating circuit (e.g., a dedicated LED driver IC or resistor + transistor stage). Its low output impedance (<0.27Ω) and fast transient response make it ideal for feeding such regulators, but it does not sense or control LED current directly.
What are the absolute maximum ratings for the VSEL pin on LTC3203BEDD#PBF?
The VSEL pin on LTC3203BEDD#PBF has an absolute maximum rating of –0.3V to VIN + 0.3V. It draws negligible current (±1µA), so standard CMOS logic outputs (e.g., GPIO from MCU) can safely drive it. A pull-down resistor to GND ensures default 4.5V output if left unconnected, satisfying the requirement that VSEL must not float.
How does the MODE pin function in LTC3203BEDD#PBF, and what voltage thresholds trigger mode switching?
The MODE pin on LTC3203BEDD#PBF selects 1.5× boost (MODE > 0.91V typical) or 2× boost (MODE < 0.82V typical), with hysteresis preventing oscillation. Thresholds are VMODEH = 0.874–0.946V and VMODEL = 0.788–0.852V. A resistor divider from VIN to GND sets the exact switch point - e.g., R1/R2 = 4:1 triggers 1.5×→2× transition near 3.0V input, optimizing efficiency across battery discharge.
Is the exposed thermal pad (Pin 11) of LTC3203BEDD#PBF electrically connected to GND?
Yes - the exposed pad (Pin 11) of LTC3203BEDD#PBF is internally connected to GND and must be soldered to a PCB copper pour tied to the main ground plane. This connection is mandatory for both thermal performance (θJA = 44°C/W) and electrical integrity. Failure to solder the pad risks thermal shutdown under load and degraded noise immunity.
LTC3203BEDD#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)
LTC3203BEDD#PBF FAQ
1.How can I place an order for LTC3203BEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3203BEDD#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 LTC3203BEDD#PBF reliable?
The price and inventory of LTC3203BEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3203BEDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3203BEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3203BEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3203BEDD#PBF?
LTC3203BEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3203BEDD#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 LTC3203BEDD#PBF?
For technical support, including LTC3203BEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3203BEDD#PBF requirements.
6.How does Aetrix verify that LTC3203BEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3203BEDD#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 LTC3203BEDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3203BEDD#PBF?
All LTC3203BEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3203BEDD#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 LTC3203BEDD#PBF part is unused and in its original packaging.
Return procedure for LTC3203BEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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