Programmable Dual Output Power Supply
Description
The KTZ8812 is a dual output power supply IC used in portable appliances where both a positive and negative supply is required. The positive and negative output rails provide bias supplies for TFT LCD panels, OPA, Audio Amplifiers, DAC etc. The device only requires a single inductor, thereby minimizing the total PCB area.
It features an integrated step-up DC-DC converter with input voltage range from 2.7V to 5.5V. An LDO and charge pump generate dual regulated outputs, whose voltages can be programmed via an I2C compatible interface. Optimized step-up, LDO and charge pump converters maximize conversion efficiency, exceeding 85%.
KTZ8812 integrates all compensation and soft-start circuitry, which results in a simpler and smaller solution with much fewer external components. High switching frequency (1.8MHz) allows the use of a smaller inductor and capacitor to further reduce the solution size.
The I2C compatible interface allows control of the positive and negative outputs from +4.0V to +6.3V and from -4.0V to -6.3V, respectively, as well as programming additional registers on the device.
KTZ8812 is available in a RoHS compliant 15-bump 2.2mm x 1.45mm x 0.62mm WLCSP.
Features
- Input voltage range (2.7V to 5.5V)
- Dual output regulator with single inductor
- High efficiency above 85%
- Charge pump with PFM mode at light load
- Programmable output voltages
- Positive output voltage range
- +4.0V to +6.3V (100mV/step)
- Negative output voltage range
- -4.0V to -6.3V (100mV/step)
- Programmable regulator offset voltage
- 1.0% output voltage accuracy
- Regulated output current up to 150mA
- Programmable active discharge
- I2C compatible interface
- 1 µA shutdown supply current
- Pb-free WLCSP-15 package
- -40°C to +85°C Temperature Range
Applications
- Smartphone or Tablet TFT-LCD
- Operational Amplifiers
- Audio Amplifier Power
- Digital to Analog converters
- General Dual Power Supply Applications
Packaging Information
| Package | Dimensions | Bumps | Package Type |
| WLCSP35-15 | 2.20mm x 1.45mm x 0.62mm | 15 | UO |
Parameters
| Vin (min) | Vin (max) | Control Type |
| 2.5V | 5.5V | I2C |
Technical Documentation
| Description | Documents | Type |
|---|---|---|
| Datasheet | KTZ8812-04b | |
| Package Outline Drawing | WLCSP35-15 UO POD |
Purchase
| Purchase Options |
|---|
| Buy from Digi-Key |
| Buy from Mouser |