Overview
The L6902D is a complete and simple step-down switching regulator with adjustable current limit, produced by STMicroelectronics. It is based on a voltage mode structure and integrates a current error amplifier to provide constant voltage and constant current control. This device is designed for high efficiency and reliability, featuring an internal robust P-channel DMOS transistor with a typical on-resistance of 250 mΩ. The L6902D offers adjustable current limit programming using an on-board current sense resistor and current sense pins, making it suitable for various applications including battery charging and DC/DC conversion.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Input Voltage | 8 | - | 36 | V |
| Output Current | 0.95 | 1 | 1.05 | A |
| Output Voltage Range | 1.235 | - | 34 | V |
| Switching Frequency | 212 | 250 | 287 | kHz |
| Dropout Voltage | 0.25 | 0.5 | - | V |
| Maximum Limiting Current | 2 | 2.5 | 3.2 | A |
| Thermal Shutdown Temperature | - | 150 | - | °C |
| Package Type | - | - | SO-8 | - |
Key Features
- Up to 1 A output current
- Operating input voltage from 8 V to 36 V
- Precise 3.3 V (±2%) reference voltage
- 5% output current accuracy
- Output voltage adjustable from 1.235 V to 34 V
- 250 kHz internally fixed frequency
- Voltage feedforward
- Zero load current operation
- Adjustable current limit
- Protection against feedback disconnection
- Thermal shutdown
- Overvoltage protection, frequency fallback, and overcurrent protection
Applications
- Chargers for NiCd, NiMH batteries and pre-regulator for lithium-ion batteries
- Adjustable current generator
- Simple step-down converters with adjustable current limit
- Battery-equipped systems
- Distributed power supply
- Mobile PC and subnotebook
Q & A
- What is the maximum output current of the L6902D?
The maximum output current of the L6902D is up to 1 A.
- What is the operating input voltage range of the L6902D?
The operating input voltage range is from 8 V to 36 V.
- How accurate is the output current of the L6902D?
The output current accuracy is ±5%.
- What is the adjustable output voltage range of the L6902D?
The output voltage is adjustable from 1.235 V to 34 V.
- What is the switching frequency of the L6902D?
The switching frequency is internally fixed at 250 kHz.
- Does the L6902D have thermal protection?
Yes, the L6902D has thermal shutdown protection at 150°C with 20°C hysteresis.
- What types of batteries can the L6902D charge?
The L6902D can charge NiCd, NiMH batteries and serve as a pre-regulator for lithium-ion batteries.
- What is the package type of the L6902D?
The package type is SO-8.
- Does the L6902D have overvoltage protection?
Yes, the L6902D includes overvoltage protection along with other protections like frequency fallback and overcurrent protection.
- Can the L6902D be used in distributed power supply systems?
Yes, the L6902D can be used in distributed power supply systems.
- Is the L6902D suitable for mobile PC and subnotebook applications?
Yes, the L6902D is suitable for mobile PC and subnotebook applications.
