Analog Devices Inc. LT83203/LT83205 Synchronous Step-Down Regulators
Analog Devices LT83203/LT83205 Synchronous Step-Down Regulators are uniquely designed to combine an ultra-low-noise reference with a Silent Switcher® architecture to achieve high efficiency and excellent wideband noise performance. The innovative ultra-low-noise architecture provides exceptional low-frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, resulting in virtually constant output noise independent of output voltage.
The Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies. The Analog Devices LT83203/LT83205 is ideal for high-current, noise-sensitive applications that benefit from the high efficiency of a synchronous switching regulator.
Features
- Silent Switcher 3 architecture
- Ultra-low 4μVRMS noise (10Hz to 100kHz)
- Ultra-low 4nV/√Hz spot noise at 10kHz
- Ultra-low EMI emissions
- Ultra-fast transient response with <1μs transient recovery time
- High efficiency at high frequency
- Up to 93% efficiency at 2MHz, 12VIN to 3.3VOUT
- Up to 90% efficiency at 4MHz, 12VIN to 3.3VOUT
- 2.8V to 18V input voltage range
- Output voltage range of 0V to (VIN to 0.5V) with a unity gain configuration up to 13V output
- Fast 15ns minimum switch-on-time
- Maximum continuous output current
- LT83203: 3A
- LT83205: 5A
- Adjustable and synchronizable from 300kHz to 6MHz
- Precision reference of ±0.7% over temperature with remote sense
- Supports dynamic output voltage control
- Pin selectable forced continuous mode or pulse-skipping mode
- Programmable Power Good
- Tiny 15-lead 3mm × 2mm LFCSP package
- Pin-to-pin compatible with LT83201 (1A), LT83203 (3A), and LT83205 (5A)
Applications
- RF power supplies (PLLs, VCOs, mixers, LNAs, and PAs)
- High-speed/-precision ADCs/DACs
- Low-noise instrumentation
- General-purpose power supply
Typical Application
Published: 2025-04-14
| Updated: 2025-04-21