Key facts
- Model
- LM2796
- Category
- Other Electronics
- Industry
- Electronics
- Documents
- 3
- Languages
- EN
- Last added
- 2012-05-04
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National Semiconductor LM27961 Dual-Display White LED Driver with 3/2x Switched Capacitor Boost handbook
The LM27961 is a charge‑pump‑based LED driver designed for mobile phone display backlighting. It provides two independently controlled LED groups: Group A for up to four common‑anode LEDs (main display) and Group B for up to three common‑cathode LEDs (sub‑display). Current for each LED is programmable with external resistors, and brightness can be dimmed via a PWM signal.
The device operates from a 2.7 V to 5.5 V Li‑ion input, uses a high‑efficiency 3/2× charge pump, and is supplied in an 18‑bump thin micro‑SMD package. Typical applications include mobile phone display lighting, keypad lighting, PDAs, and general LED lighting.
National Semiconductor LM2796 specifications
| Input voltage range | 2.7 V to 5.5 V |
|---|---|
| LED drive current per LED | up to 20 mA each |
| Maximum LEDs per group | Group A: up to 4 LEDs, Group B: up to 3 LEDs |
| PWM brightness control frequency | 100 Hz – 1 kHz |
| Charge‑pump gain | 3/2× |
All National Semiconductor LM2796 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
- National Semiconductor LM27961 Dual-Display White LED Driver with 3/2x Switched Capacitor Boost handbook 13 p
- National Semiconductor LM27966 White LED Driver with I2C Compatible Brightness Control Handbook 13 p
- NATIONAL SEMICONDUCTOR LM2796 Dual-Display White LED Driver with 3/2x Switched Capacitor Boost Manual 8 p
Questions answered in these manuals
What is the input voltage range of the LM27961?
The LM27961 operates from 2.7 V up to 5.5 V.
How many LEDs can each LED group drive?
Group A can drive up to four LEDs, while Group B can drive up to three LEDs.
What is the maximum total output current of the LM27966?
The device can supply up to 180 mA total output current, which can be divided as 30 mA per LED when driving six LEDs.
From: National Semiconductor LM27966 White LED Driver with I2C Compatible Brightness Control Handbook
What input voltage range does the LM27966 support?
The LM27966 operates with an input voltage between 2.7 V and 5.5 V.
From: National Semiconductor LM27966 White LED Driver with I2C Compatible Brightness Control Handbook
What is the recommended input voltage range for the LM2796?
The LM2796 operates from 2.7 V up to 5.5 V.
How many LEDs can the LM2796 drive and at what current?
It can drive up to seven white LEDs, each up to 20 mA.