HM5309
HM5309 is PFM Step-Up DC-DC Controller manufactured by H&M Semiconductor.
PFM Step-Up DC-DC Controller IC
General Description
The HM5309 is a simple, pact PFM boost controller designed for applications where extremely low cost and small size are top priorities. The output voltage is fixed at 9V with 1% accuracy from an input voltage range of +2.7V to +6.5V. Low current consumption of 32u A typical makes HM5309 ideal for battery-powered applications. The HM5309 is designed specifically to provide a simple application circuit and minimize the size and number of external ponents, making them ideal for consumer electronics applications. The HM5309 adopts PFM operating mode, which provides excellent efficiency over a wide-range of input voltage and load currents. The on-time and off-time are tuned to permit optimization of external ponent size. Chip enable input can make HM5309 into ultra-low-current shutdown mode. The HM5309 is available in a space-saving 6-pin SOT23 package.
Applications
- Hand-held Devices
- LCD Bias
- Electric toys
- Charger
Features
- Operating voltage range：2.7V to 6.5V
- Low Operating Current: 32u A@5V
- Fixed Output Voltage of 9V
- High Output voltage accuracy：±1%
- No Feedback Resistor needed
- Output Voltage can be adjusted upwards with
External Resistor
- Output Power: up to 40W
- High Efficiency: up to 94%
- Chip Enable Input
- Operating Temperature Range
-40°C to +85°C
- Available in SOT23-6
- Pb-free, rohs-pliant and Halogen-free
Pin Assignment
Typical Application Circuit
Figure 1 Typical Application Circuit (Fixed Output Voltage)
Figure 2 Typical Application Circuit (Adjust Output Voltage with Rx)
In the application circuit of Figure 2, the output voltage is determined by the following equation: Vout = 9 + 10.7ⅹ10-6ⅹRx (V) (Typical)
Where, Rx is the resistance in ohm The resistance of Rx can not be over 20K ohm.
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