Overview
The L6902D, produced by STMicroelectronics, is a complete and simple step-down switching regulator with adjustable current limit. It is based on a voltage mode structure and integrates a current error amplifier to provide constant voltage and constant current control. This regulator is designed for high efficiency and reliability, featuring an internal robust P-channel DMOS transistor with a typical on-resistance of 250 mΩ. The device includes several protection mechanisms such as thermal shutdown, overvoltage protection, frequency foldback overcurrent protection, and protection against feedback disconnection. The L6902D is suitable for various applications requiring adjustable current limits and high precision voltage regulation.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Input Voltage Range | 8 | - | 36 | V |
| Output Current | 0.95 | 1 | 1.05 | A |
| Output Voltage Range | 1.235 | - | 34 | V |
| Switching Frequency | 212 | 250 | 287 | kHz |
| Reference Voltage | 3.234 | 3.3 | 3.366 | V |
| Dropout Voltage | 0.25 | 0.5 | - | V |
| Maximum Limiting Current | 2 | 2.5 | 3.2 | A |
| Operating Temperature Range | -40 | - | 125 | °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 foldback overcurrent protection
Applications
- Chargers for NiCd, NiMH batteries and preregulator 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 for the L6902D?
The operating input voltage range for the L6902D is from 8 V to 36 V.
- What is the precision of the reference voltage in the L6902D?
The reference voltage in the L6902D is precise to 3.3 V (±2%).
- How accurate is the output current of the L6902D?
The output current accuracy of the L6902D is ±5%.
- What is the adjustable output voltage range of the L6902D?
The output voltage of the L6902D is adjustable from 1.235 V to 34 V.
- What is the internally fixed switching frequency of the L6902D?
The internally fixed switching frequency of the L6902D is 250 kHz.
- Does the L6902D have thermal shutdown protection?
Yes, the L6902D includes thermal shutdown protection.
- What are some of the protection mechanisms included in the L6902D?
The L6902D includes protections such as overvoltage protection, frequency foldback overcurrent protection, and protection against feedback disconnection.
- What is the package type of the L6902D?
The L6902D is packaged in an SO-8 package.
- What are some common applications of the L6902D?
The L6902D is commonly used in chargers for NiCd, NiMH batteries, and as a preregulator for lithium-ion batteries, among other applications.
