CAT3648: LED Driver, 4-Channel with 32 Dimming Levels
The CAT3648 is a high efficiency fractional charge pump that can drive up to four LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors. Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of small external ceramic capacitors. The multi-fractional charge pump supports a wide range of input voltages from 2.4 V to 5.5 V. The EN/DIM logic input functions as a chip enable and a digital dimming interface for setting the current in all the LED channels. The 1-wire pulse-dimming interface supports 32 linear steps from full-scale down to zero current.
Features- High efficiency 1.33x charge pump
- Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
- Drives up to 4 LEDs at 25 mA each
- 1-wire EZDim™ 32 linear steps
- Power efficiency up to 92%
- Low noise input ripple in all modes
- 'Zero' current shutdown mode
- Soft start and current limiting
- Short circuit protection
- Thermal shutdown protection
|
Applications | End Products- Mobile Phones
- Digital Still Camera
|
Data Sheets (1)
Package Drawings (1)
| Document Title | Document ID/Size | Revision |
|---|
| TQFN16, 3x3 | 510AD (55.6kB) | A |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| CAT3648HV3-GT2 | Active | Pb-free
Halide free | TQFN-16 | 510AD | 1 | Tape and Reel | 2000 | $0.4267 |
Specifications
| Product | Topology | VIN Min (V) | VIN Max (V) | VO Max (V) | IO Max (mA) | fSW Typ (kHz) |
|---|
| CAT3648HV3-GT2 | Charge Pump | 2.5 | 5.5 | 6 | 100 | 1000 |
