Overview
The NCP1521BSNT1G is a step-down PWM DC-DC converter optimized for portable applications powered from one cell Li-ion or three cell Alkaline/NiCd/NiMH batteries. This monolithic integrated circuit is designed to deliver high efficiency and reduce external component count through synchronous rectification. It features a built-in 1.5 MHz (nominal) oscillator, which allows for smaller inductors and capacitors, and automatic switching between PWM and PFM modes to improve system efficiency. The device is available in space-saving, low-profile TSOP5 and UDFN6 packages, making it suitable for a variety of compact portable devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.7 | - | 5.5 | V |
| Output Voltage Range | 0.9 | - | 3.9 | V |
| Output Current Range | 100 mA | - | 600 mA | - |
| Switching Frequency | - | 1.5 MHz | 1.8 MHz | - |
| Efficiency | - | - | 96% | - |
| Quiescent Current (PFM No Switching) | - | 30 μA | 45 μA | - |
| Shutdown Current | - | - | 0.3 μA | - |
| Operating Temperature Range | -40°C | - | 85°C | - |
| Package Type | - | - | TSOP-5 | - |
| Pin Count | - | - | 5 | - |
Key Features
- Synchronous rectification for higher efficiency and reduced external part count.
- Automatic switching between PWM and PFM modes to improve system efficiency at light load conditions.
- Adjustable output voltage from 0.9 V to 3.9 V.
- High efficiency up to 96% and low quiescent current of 30 μA in PFM mode.
- Integrated soft-start, cycle-by-cycle current limiting, and thermal shutdown protection.
- Best-in-class low ripple even in PFM mode.
- All pins are fully ESD protected.
- Compact TSOP5 package for space-saving designs.
Applications
- Power supply for application processors and processors with low core voltage.
- Cellular phones, smartphones, and PDAs.
- MP3 players and portable audio systems.
- Digital still cameras and video cameras.
- Consumer electronics and portable devices.
- Audio equipment.
Q & A
- What is the input voltage range of the NCP1521BSNT1G?
The input voltage range is from 2.7 V to 5.5 V.
- What is the adjustable output voltage range of the NCP1521BSNT1G?
The output voltage can be adjusted from 0.9 V to 3.9 V.
- What is the maximum output current of the NCP1521BSNT1G?
The maximum output current is 600 mA.
- What is the switching frequency of the NCP1521BSNT1G?
The nominal switching frequency is 1.5 MHz, with a maximum of 1.8 MHz.
- What are the key efficiency features of the NCP1521BSNT1G?
The device features synchronous rectification, automatic switching between PWM and PFM modes, and up to 96% efficiency).
- What protection features does the NCP1521BSNT1G have?
The device includes integrated soft-start, cycle-by-cycle current limiting, thermal shutdown protection, and short-circuit protection).
- What is the quiescent current in PFM mode?
The quiescent current in PFM mode is 30 μA).
- What is the shutdown current of the NCP1521BSNT1G?
The shutdown current is 0.3 μA).
- What are the typical applications of the NCP1521BSNT1G?
Typical applications include cellular phones, smartphones, PDAs, MP3 players, portable audio systems, and digital cameras).
- What package types are available for the NCP1521BSNT1G?
The device is available in a TSOP5 package).
