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About Cypress
Cypress is the leader in advanced embedded system solutions for the world's most innovative
automotive, industrial, smart home appliances, consumer electronics and medical products.
Cypress' microcontrollers, analog ICs, wireless and USB-based connectivity solutions and reliable,
high-performance memories help engineers design differentiated products and get them to market
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MB39C031
2ch Buck DC/DC Converter + 1ch LDO
with I
2
C 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.
2
Also, it contains the CTL input pin which can control the ON/OFF for each CH, the Power Good signal output pin and the I C
communication interface, therefore it is easy to design the power supply sequence.
It is possible to tune in the output voltage exactly using the I C communication and possible to correspond to the DVS/ASV system.
2
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: I C (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
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
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
2
20. I C Interface............................................................................................................................................... 30
2
21. Structure of I C 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
MB39C031
1. Application Circuit Example
Vin
5.0V
MB39C031
PVCC1
PVCC2
PVCCL
LX1
IN1
PGND1
1.5μH
Vo1
1.2V 1.4A
10μF
4.7μF
4.7μF
4.7μF
VCC
VCC
LX2
IN2
PGND2
1.5μH
Vo2
1.8V 0.6A
10μF
0.1μF
0.1μF
CTL Signal
CTL1
CTL2
CTLL
CTLMAIN
VCCI2C
SCL
SDA
ADDSEL
0.1μF
VR
VREF
LDO
LDO
3.3V 0.25A
10μF
I
2
C
Signal
100k 100k 100k 100k
PG1
PG2
PGL
ERR
0.47μF
GND
GND
Document Number: 002-08407 Rev. *B
Page 3 of 69
MB39C031
2. Recommended Application Specifications
[Input Voltage Range]
Input voltage VCC (V)
Min
2.5
Typ
3.6
Max
5.5
[Output Specification]
(Ta=+25°C)
Accuracy
Channel
Symbol
Output Limit
Output voltage
current Current
(V)
(mA) (mA)
Min Typ Max
0.99* 1.00* 1.01*
1.01 1.02 1.03
1.03 1.04 1.05
1.05 1.06 1.07
1.07 1.08 1.09
1.09* 1.10* 1.11*
1.11 1.12 1.13
DD1 Vo1 ±1.2%
1.13 1.14 1.15
1.15 1.16 1.17
1.17 1.18 1.19
1.19* 1.20* 1.21*
1.21 1.22 1.23
1.23 1.24 1.25
1.24 1.26 1.28
1.26 1.28 1.30
1.28* 1.30* 1.32*
1.19* 1.20* 1.21*
1.24 1.25 1.27
1.28 1.30 1.32
1.33* 1.35* 1.37*
1.38 1.40 1.42
1.43 1.45 1.47
1.48* 1.50* 1.52*
DD2 Vo2 ±1.2%
1.53 1.55 1.57
1.58 1.60 1.62
1.63 1.65 1.67
1.68 1.70 1.72
1.73 1.75 1.77
1.78* 1.80* 1.82*
1.83 1.85 1.87
1.88 1.90 1.92
1.93 1.95 1.97
600
900
Buck
(synchronous
rectification)
C-mode
3.0
1.5
10
1400
Buck
2000 (synchronous
rectification)
C-mode
3.0
1.5
10
Max
Min
Switching Coil
Output Soft-start Discharge
frequency
capacitance time resistance Remarks
(MHz) (μH)
(μF)
(ms)
(kΩ)
14.3
0.9*
1.8
2.7
3.6
4.5
5.4
6.3
7.2
8.1
9.0
9.9
10.8
11.6
12.5
13.4
14.3
0.9*
1.8
2.7
3.6
4.5
5.4
6.3
7.2
8.1
9.0
9.9
10.8
11.6
12.5
13.4
5
Built-in SW
FET
Built-in
output
setting
resistors
Operation
mode
switching
(Fixed
PWM,
PFM/PWM)
5
Built-in SW
FET
Built-in
output
setting
resistors
Operation
mode
switching
(Fixed
PWM,
PFM/PWM)
Mode
Document Number: 002-08407 Rev. *B
Page 4 of 69
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