RT8259
RT8259 is 1.4MHz Step-Down Converter manufactured by Richtek.
Description
The RT8259 is a high voltage buck converter that can support the input voltage range from 4.5V to 24V and the output current can be up to 1.2A. Current Mode operation provides fast transient response and eases loop stabilization. The chip also provides protection functions such as cycleby-cycle current limiting and thermal shutdown protection. The RT8259 is available in a SOT-23-6 and TSOT-23-6 packages.
Features z z z z z z z z z
Wide Operating Input Voltage Range : 4.5V to 24V Adjustable Output Voltage Range : 0.8V to 15V 1.2A Output Current 0.3Ω Internal Power MOSFET Switch High Efficiency up to 92% 1.4MHz Fixed Switching Frequency Stable with Low ESR Output Ceramic Capacitors Thermal Shutdown Cycle-By-Cycle Over Current Protection Ro HS pliant and Halogen Free
Ordering Information
RT8259 Package Type E : SOT-23-6 J6 : TSOT-23-6 Lead Plating System G : Green (Halogen Free and Pb Free)
Note : Richtek products are :
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Applications z z z z
Distributed Power Systems Battery Charger Pre-Regulator for Linear Regulators WLED Drivers
Pin Configurations
(TOP VIEW) http://..net/
Ro HS pliant and patible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in Sn Pb or Pb-free soldering processes.
PHASE VIN 6 5 2 BOOT GND
EN 4 3 FB
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Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your area.
SOT-23-6/TSOT-23-6
Typical Application Circuit
VIN 4.5V to 24V 5 VIN C1 10µF Chip Enable Open = Automatic Startup BOOT 1 CB 10n F D1 B230A L1 4.7µH R1 62k C2 22µF R2 19.6k VOUT 3.3V
RT8259 PHASE 6 4 EN GND 2 FB 3
DS8259-03 March 2011
.richtek. 1 datasheet pdf
- http://..net/
Table 1. Remended ponent Selection, C2 = 22μF
V OUT (V) L1 (μH) R1 (kΩ) R2 (kΩ)
1.2 2 62 124
1.8 2 62 49.9
2.5 3.6 62 29.4
3.3 4.7 62 19.6
5 6.8 62 12
8 10 68 7.5
10 10 68 5.9
15 15 68 3.9
Functional Pin Description
Pin No. 1 Pin Name BOOT Pin Function Bootstrap. A...
