RT1741A
RT1741A is High Efficiency Single Inductor Buck-Boost Converter manufactured by Richtek.
Description
The RT1741A is a high efficiency single inductor Buck Boost Converter which can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 4A. The maximum peak current in the switches is limited to a typical value of 4.5A.
The RT1741A feedback loop is internally pensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes and optimal transient response. The RT1741A operates at 2.4MHz typical switching frequency in full synchronous operation.
The RT1741A operates in Pulse Skipped Modulation (PSM) mode for increasing efficiency during low power RF transmission modes. The Power Save Mode can be disabled, forcing the RT1741A to operate at a fixed switching frequency operation at 2.4MHz. The RT1741A can also be synchronized with external frequency from 2.2MHz to 2.6MHz. The output voltage is programmable using an external resistor divider.
Features
- Operates from a Single Li-ion Cell : 1.8V to 5.5V
- Adjustable Output Voltage : 1.8V to 5.5V
- 3A Maximum Load Capability for VIN > 3.6V,
VOUT = 3.3V
- Power Save Mode (PSM) for Improving Low Output
Power Efficiency
- Fixed Frequency Operation at 2.4MHz and
Synchronization Possible from 2.2MHz to 2.6MHz
- Up to 96% Efficiency
- Input Current Limit
- Internal pensation
- Ro HS pliant and Halogen Free
Applications
- Cellular Phones
- Portable Hard Disk Drives
- PDAs
Pin Configuration
(TOP VIEW)
VINA 1 GND 2
FB 3 VOUT 4 VOUT 5
LX2 6 LX2 7
PGND
14 PGOOD 13 PS/SYNC 12 EN 11 VIN 10 VIN 9 LX1 8 LX1
WDFN-14AL 4x3
Simplified Application Circuit
LX1 LX2
VOUT
VINA
Enable
PGOOD
PS/SYNC GND...
