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MB39C502/503/504
High Efficiency Step Down
DC/DC Controller Datasheet
Description
MB39C502 is a single output step down DC/DC controller using external FETs. It achieves the high efficiency with
Enhanced Low Power Mode (LPM) Operation in light load. In Enhanced LPM, this controller operates that the
quiescent current is reduced only 30A and the switching frequency is fallen by extending on time. These operations
enable to improve the efficiency in light load. Internal compensation circuit with current mode architecture and internal
boost switch allow reducing the BOM parts and the component area.
Features
High Efficiency with Enhanced LPM Operation
Automatic Transition for PFM/PWM
Enhanced LPM Operation Transferred by SLP_N Assertion
Over Current Alerting
Reference Voltage Accuracy: 1%
Output Voltage Range : 0.7V to 2.0V (MB39C502)
: 2.4V to 3.5V (MB39C503)
: fixed 5V (MB39C504)
VIN Input Voltage Range : 4.0V to 25V (MB39C502/C503)
: 5.4V to 25V (MB39C504)
VDD Input Voltage Range: 4.5V to 5.5V (MB39C502/C503)
Internal 5V LDO with Switchover (MB39C504)
Fixed Frequency Emulated On-Time Control: 800kHz
Current Mode Architecture with Internal Compensation Circuit
Internal Boost Switch
Fixed 700s Soft Start Time without Load Dependence
Internal Discharge FET
Power Good Monitor
Enhanced Protection Functions: OVP, UVP, ILIM
Thermal Shutdown
Small 3mm 3mm 0.75mm QFN16 Package
Applications
Point of Load VR for Note PC
General Purpose Step Down Regulator
Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600
Document Number: 002-08449 Rev *A Revised February 12, 2016