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Cypress Semiconductor Electronic Components Datasheet

MB39C031 Datasheet

2ch Buck DC/DC Converter + 1ch LDO

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MB39C031
2ch Buck DC/DC Converter + 1ch LDO
with I2C Interface and SW FET
Description
The MB39C031 contains 2ch buck DC/DC converter and 1ch LDO. It is possible to supply the main power supply line in a system
by using only one chip. The current mode system is adopted for the DC/DC converter, and it is possible to use the chip inductor
with the high switching frequency operation which contains internal SW FET. The MB39C031 contains the output setting resistor
and the the phase compensation circuit, and contributes to reduce the number of external components and the mounting area.
Also, it contains the CTL input pin which can control the ON/OFF for each CH, the Power Good signal output pin and the I2C
communication interface, therefore it is easy to design the power supply sequence.
It is possible to tune in the output voltage exactly using the I2C communication and possible to correspond to the DVS/ASV system.
Features
Operating input voltage range:2.5 V to 5.5 V (Maximum rating: 7 V)
Output voltage setting range, Maximum output current: DD1*:1.0 V to 1.3 V (20 mV/step), 1.4 A (DC)
DD2*:1.2 V to 1.95 V (50 mV/step), 0.6 A (DC)
LDO:2.8 V/2.85 V/3.0 V/3.3 V, 0.25 A (DC)
Note: Each channel has selective preset voltage (Lineup for a total of 32 kinds) .
Soft-start time setting range: 0.9 ms to 14.3 ms (approximately 0.9 ms/step)
Switching frequency for the DC/DC block:3 MHz (fixed)
Communication interface: I2C (ON/OFF, Output voltage, Soft-start time setting)
Built-in PFM/PWM auto switching mode
Built-in function: Output setting resistor, Phase compensation circuit, Discharge resistor, Soft-start
Each Channel Power Good output function (Open-drain)
Protection function: Under voltage lockout protection circuit (UVLO), Over current protection circuit (OCP), Thermal shutdown
protection circuit (TSD)
Error signal output pin installed (Open-drain)
Small package: QFN28 (4 mm × 4 mm × 0.8 mm, 0.4 mm pitch)
*: DD1,DD2 : DC/DC converter block 1, 2
Applications
Network equipment: Wifi-tuner, Surveillance camera
Data-storage device: HDD, SSD, Picture recording equipment
Image and voice output equipment: MFP, Printer, Scanner, Projector, Electrophone, STB
Various terminals: POS, FA, HEMS
etc.
Cypress Semiconductor Corporation
Document Number: 002-08407 Rev. *B
• 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Revised May 18, 2017


Cypress Semiconductor Electronic Components Datasheet

MB39C031 Datasheet

2ch Buck DC/DC Converter + 1ch LDO

No Preview Available !

MB39C031
Contents
Description.......................................................................................................................................................... 1
Features ............................................................................................................................................................. 1
Applications ........................................................................................................................................................ 1
1. Application Circuit Example......................................................................................................................... 3
2. Recommended Application Specifications .................................................................................................. 4
3. Pin Assignment............................................................................................................................................ 6
4. Pin Descriptions (PKG) ............................................................................................................................... 7
5. Block Diagram ............................................................................................................................................. 9
6. Absolute Maximum Ratings....................................................................................................................... 10
7. Recommended Operating Conditions ........................................................................................................11
8. Electrical Characteristics ........................................................................................................................... 12
9. Operation Mode List .................................................................................................................................. 17
10. State Transition Diagram ........................................................................................................................... 18
11. Turning On and Off Sequence (Turning On CTL*:CTL1, CTL2, CTLMAIN=VCC Simultaneously) .......... 19
12. CTL* Turning On and Off Sequence 1 (VCC → CTL*: CTL1, CTL2, CTLMAIN)...................................... 20
13. CTL* Turning On and Off Sequence 2(VCC→CTLMAIN→CTL1→CTL2)................................................ 21
14. CTL* Pin Threshold Voltage...................................................................................................................... 22
15. Protection Operation Sequence ................................................................................................................ 23
16. Operation Condition, Stop Circuit and Release Condition for Protection Circuit ...................................... 25
17. DD Soft-Start Operation ............................................................................................................................ 26
18. Discharge Operation ................................................................................................................................. 27
19. PG1/PG2/PGL PIN and ERR PIN ............................................................................................................. 29
20. I2C Interface............................................................................................................................................... 30
21. Structure of I2C Interface and Data ........................................................................................................... 36
22. I/O Pin Equivalent Circuit Diagram............................................................................................................ 41
23. I/O Circuit Type.......................................................................................................................................... 42
24. Typical Operation Characteristic Measurement Circuit ............................................................................. 43
25. Reference Data ......................................................................................................................................... 45
26. Usage Precaution...................................................................................................................................... 65
27. Ordering Information ................................................................................................................................. 66
28. Preset Code (MB39C031) ......................................................................................................................... 66
29. Package Dimensions................................................................................................................................. 67
Document History ............................................................................................................................................. 68
Sales, Solutions, and Legal Information........................................................................................................... 69
Document Number: 002-08407 Rev. *B
Page 2 of 69


Part Number MB39C031
Description 2ch Buck DC/DC Converter + 1ch LDO
Maker Cypress
Total Page 30 Pages
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