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Cypress Semiconductor Electronic Components Datasheet

MB39C504 Datasheet

High Efficiency Step Down DC/DC Controller Datasheet

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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 30μA 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 700μs 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
Document Number: 002-08449 Rev *A
• 198 Champion Court • San Jose, CA 95134-1709 •
408-943-2600
Revised February 12, 2016


Cypress Semiconductor Electronic Components Datasheet

MB39C504 Datasheet

High Efficiency Step Down DC/DC Controller Datasheet

No Preview Available !

MB39C502/503/504
Contents
1. Typical Application ................................................................................................................................ 3
2. Pin Configuration................................................................................................................................... 4
3. Pin Configuration................................................................................................................................... 6
4. Block Diagram........................................................................................................................................ 8
5. Absolute Maximum Rating.................................................................................................................. 10
6. Recommended Operating Conditions.................................................................................................11
7. Electrical Characteristics .................................................................................................................... 13
8. Protections and Power Good function............................................................................................... 22
8.1 Description......................................................................................................................................... 22
8.2 Timing Chart ...................................................................................................................................... 23
9. Enhanced LPM Description ................................................................................................................ 27
9.1 Ultra Low Quiescent Current.............................................................................................................. 28
9.2 Extended On Time ............................................................................................................................. 28
9.3 Timing Chart of Enhanced LPM ......................................................................................................... 29
10. Over Current Alerting Description.................................................................................................. 30
11. Application Note .............................................................................................................................. 31
11.1 Setting Operating Conditions ............................................................................................................. 31
11.1.1 Setting Output Voltage ................................................................................................................... 31
11.1.2 Setting Over Current Limitation and Over Current Alerting ............................................................ 31
11.2 Selection Parts................................................................................................................................... 32
11.2.1 Selection of Smoothing Inductor .................................................................................................... 32
11.2.2 Selection of Switching FET ............................................................................................................ 33
11.2.3 Selection of Fly Back Diode ........................................................................................................... 35
11.2.4 Selection of Boost Diode................................................................................................................ 35
11.2.5 Selection of Input Capacitor........................................................................................................... 36
11.2.6 Selection of Output Capacitor ........................................................................................................ 37
11.2.7 Selection of Boost Capacitor.......................................................................................................... 38
11.2.8 Selection of VDD Capacitor ........................................................................................................... 39
11.2.9 Selection of VCC Capacitor and Resistor ...................................................................................... 39
11.3 Layout ................................................................................................................................................ 40
12. Ordering Information ....................................................................................................................... 43
13. Package Dimensions ....................................................................................................................... 44
14. Major Changes ................................................................................................................................. 45
Document Number: 002-08449 Rev *A
Page 2 of 46


Part Number MB39C504
Description High Efficiency Step Down DC/DC Controller Datasheet
Maker Cypress
Total Page 30 Pages
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