The LP55231 is a 9-channel LED driver designed to produce lighting effects for mobile devices. A high-efficiency charge pump enables LED driving over full Li-Ion battery voltage range. The device is equipped with an internal program memory, which allows operation without processor control.
The LP55231 has an I2C-compatible control interface with four pin-selectable addresses. The INT pin can be used to notify processor when a lighting sequence has ended (interrupt function). Also, the device has a trigger input interface, which allows synchronization, for example, between multiple LP55231 devices. Excellent efficiency is maintained over a wide operating range by autonomously selecting the best charge pump gain based on LED forward voltage requirements. The device is able to automatically enter power-save mode when LED outputs are not active, thus lowering idle current consumption down to 10 µA (typical). Only four small and low-cost ceramic capacitors are required.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LP55231 | WQFN (24) | 4.00 mm × 4.00 mm |
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Changes from C Revision (November 2016) to D Revision
Changes from B Revision (May 2016) to C Revision
Changes from A Revision (October 2014) to B Revision
Changes from * Revision (March 2013) to A Revision
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NUMBER | NAME | ||
1 | C2+ | A | Flying capacitor 2 positive terminal |
2 | C1+ | A | Flying capacitor 1 positive terminal |
3 | VDD | P | Input power supply |
4 | GND | G | Ground |
5 | EN | I | Enable |
6 | CLK | I | 32-kHz clock input; connect to ground if not used. |
7 | INT | OD/O | Interrupt for microcontroller unit; leave unconnected if not used. |
8 | SDA | I/OD | Serial interface data |
9 | SCL | I | Serial interface clock |
10 | TRIG | I/OD | Trigger. Connect to ground if not used |
11 | D9 | A | Current source output 9 Note: powered from VDD |
12 | D8 | A | Current source output 8 (powered from VDD) |
13 | D7 | A | Current source output 7 (powered from VDD) |
14 | D6 | A | Current source output 6 |
15 | D5 | A | Current source output 5 |
16 | D4 | A | Current source output 4 |
17 | D3 | A | Current source output 3 |
18 | D2 | A | Current source output 2 |
19 | D1 | A | Current source output 1 |
20 | ASEL0 | I | Serial interface address select input |
21 | ASEL1 | I | Serial interface address select input |
22 | VOUT | A | Charge pump output |
23 | C2− | A | Flying capacitor 2 negative terminal |
24 | C1− | A | Flying capacitor 1 negative terminal |
DAP | Connect the die attach pad to GND |