RT8059GJ5：

1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC Converter
General Description
The RT8059 is a high efficiency Pulse Width Modulated
(PWM) step-down DC/DC converter, capable of delivering
1A output current over a wide input voltage range from
2.8V to 5.5V. The RT8059 is ideally suited for portable
electronic devices that are powered by 1-cell Li-ion battery
or by other power sources within the range, such as cellular
phones, PDAs and handy-terminals.
Internal synchronous rectifier with low RDS(ON) dramatically
reduces conduction loss at PWM mode. No external
Schottky diode is required in practical applications. The
RT8059 automatically turns off the synchronous rectifier
when the inductor current is low and enters discontinuous
PWM mode. This can increase efficiency in light load
condition.
The RT8059 enters low dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. The RT8059 enters
shutdown mode and consumes less than 0.1μA when the
EN pin is pulled low.
The switching ripple can be easily smoothed out by small
package filtering elements due to a fixed operation
frequency of 1.5MHz. This along with small TSOT-23-5
package provides small PCB area application. Other
features include soft-start, lower internal reference voltage
with 2% accuracy, over temperature protection, and over
current protection.
Ordering Information
Pin Configurations
(TOP VIEW)
TSOT-23-5
Note :
Richtek Pb-free and Green products are :
􀁠 RoHS compliant and compatible with the current requirements
of IPC/JEDEC J-STD-020.
􀁠 Suitable for use in SnPb or Pb-free soldering processes.
EN GND LX
FB VIN
4
2 3
5
BQ= : Product Code
DNN : Date Code
Marking Information
BQ=DNN
RT8059
Package Type
J5 : TSOT-23-5
Operating Temperature Range
G : Green (Halogen Free with Commercial
Standard)
深

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