Buck Switching Power Supply Driver with Enable Pin
Relatively stable peak current with minimal shutdown time
The ZH7805 is a COT (Constant On-Time) Buck Chopper circuit integrating an upper bridge arm MOSFET switch and a lower bridge arm switch for synchronous rectification. The on-time decreases as input voltage increases, maintaining relatively stable peak current. With minimal off-time, the ZH7805 operates exclusively in DCM (Discontinuous Conduction Mode).The ZH7805 requires no compensation capacitor or bootstrap capacitor, achieving chopper buck functionality with minimal external components. The inductor can be a single 10uH power inductor or two 22uH 0805 surface-mount inductors connected in series (total series inductance: 44uH).For low-power applications prioritizing extreme cost efficiency, the inductor can be replaced with a resistor. A 100Ω resistor is recommended, adjusted based on required power. The resistor's power dissipation equals (VM - 5V) multiplied by the output current.
ZH7805 Datasheet
Characteristics and advantages
Input up to 40V
Output voltage 5V, output capability 100mA
COT-Buck architecture
No compensation required, no bootstrap capacitor needed
Features enable pin, post-sleep power consumption <10μA
Provides 1mA output capability after sleep
SOT23-6 package
Ordering Information
| Ordering Information | Package | Pack | Quantity |
|---|---|---|---|
| ZH7805KC | SOT23-6 | Reel | 3000 |
Product Application
Documents and Resources
Semiment Product Selection Guide
ZH7805 Datasheet
Application Note for ZH7805
The ZH7805 is a COT (Constant On-Time) Buck Chopper circuit integrating an upper bridge arm MOSFET switch and a lower bridge arm switch for synchronous rectification. The on-time decreases as input voltage increases, maintaining relatively stable peak current. With minimal off-time, the ZH7805 operates exclusively in DCM (Discontinuous Conduction Mode).The ZH7805 requires no compensation capacitor or bootstrap capacitor, achieving chopper buck functionality with minimal external components. The inductor can be a single 10uH power inductor or two 22uH 0805 surface-mount inductors connected in series (total series inductance: 44uH).For low-power applications prioritizing extreme cost efficiency, the inductor can be replaced with a resistor. A 100Ω resistor is recommended, adjusted based on required power. The resistor's power dissipation equals (VM - 5V) multiplied by the output current.
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