MAX1878：Dual-Output Step-Down and LCD Step-Up Power Supply for PDAs
The MAX1878 dual power supply contains a step-down and step-up DC-DC converter in a small 12-pin TQFN package for use in PDAs. The step-down DC-DC converter delivers over 500mA to an output as low as 1.25V for logic power. The step-up DC-DC converter delivers over 15mA and an output as high as 28V for a liquid crystal display (LCD). With an input voltage from 2.0V to 5.5V the MAX1878 is intended for use in systems powered by a 2-cell alkaline or 1-cell lithium-ion (Li+) battery. Fast switching frequency allows the use of small inductors and capacitors, and the low 19µA typical quiescent current allows high efficiency when the system is in standby mode. Each output can be independently enabled. The MAX1878 is available in a small 0.75mm high 4mm x 4mm 12-pin TQFN package and requires no external FETs. The MAX1878 evaluation kit is available to speed designs.
Key Features
| MAX1878: Typical Operating Circuit Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX1878 Data Sheet | MAX1878.pdf |
Parametrics
| Part Number | Primary Topology | Monitor/Control Features | DC-DC/Power Features | LCD/LED/Flash/CCD Features | VIN (V) | VIN (V) | VOUT (V) | VOUT (V) | Max. IOUT (A) | Max. IOUT (A) | Oper. Freq. (kHz) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | min | max | See Notes | |||||||||
| MAX1878 | Step-Down | Shutdown | Current Limit Internal Switch Soft Start Sync. Rectifier | TFT Bias | 2 | 5.5 | 1.25 | 28 | 0.5 | 0.5 | 1000 | QFN/12 TQFN/12 | $1.68 @1k |
Design kits & evaluation modules
Related Products
- MAX1606：28V Internal Switch LCD Bias Supply with True Shutdown™
- MAX1733：Low-Voltage, Step-Down DC-DC Converters in SOT23
- MAX1734：Low-Voltage, Step-Down DC-DC Converters in SOT23
- MAX1605：30V Internal Switch LCD Bias Supply
- MAX1692：Low-Noise, 5.5V Input, PWM Step-Down Regulator
- MAX1677：Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX1878EGC | No Longer Available | QFN,;12 pin;16 mm² | -40°C to +85°C | No | |
| MAX1878EGC-T | No Longer Available | QFN;12 pin | -40°C to +85°C | See data sheet | |
| MAX1878ETC+ | Active | TQFN,;12 pin;16.8 mm² | -40°C to +85°C | Lead Free | |
| MAX1878ETC+T | Active | TQFN,;12 pin;16.8 mm² | -40°C to +85°C | Lead Free |
- MAX1878.pdf MAX1878
- 典型工作电路 MAX1878
