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PDF MB39C831 Data sheet ( Hoja de datos )
| Número de pieza | MB39C831 | |
| Descripción | Ultra Low Voltage Boost Power Management IC | |
| Fabricantes | Cypress Semiconductor | |
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MB39C831
Ultra Low Voltage Boost Power Management IC
for Solar/Thermal Energy Harvesting Datasheet
Description
The MB39C831 is the high-efficiency synchronous rectification boost DC/DC converter IC which efficiently supplies energy
getting from the solar cell with the single cell or multiple cells, or from the thermoelectric generator (TEG) to the Li-ion battery.
It contains the function to control the DC/DC converter output following the maximum power point of the solar cell (MPPT:
Maximum Power Point Tracking) and the protection function to charge the Li-ion battery safely.
It is possible to start-up from 0.35 V using the low-voltage process and adapts the applications which the single cell solar cell is
treated as the input.
Features
Operation input voltage range : 0.3V to 4.75V
Output voltage adjustment range : 3.0V to 5.0V
Minimum input voltage at start-up : 0.35V
Quiescent Current (No load) : 41 μA
Input peak current limit : 200 mA
Built-in MPPT
Charge voltage to the Li-ion battery/current protection function built in
Improvement of the efficiency during the low-output power according to the auto PFM/PWM switching mode
Applications
Solar energy harvesting
Thermal energy harvesting
Li-ion battery using the single cell or multiple cells' solar cell/Super Capacitor Charger
Portable audio players
Cellular phone
eBook
Electronic dictionary
Wireless remote controllers
Sensor node
Note: This product supports the web-based design simulation tool, Easy DesignSim.
It can easily select external components and can display useful information.
Please access from http://cypress.transim.com/login.aspx
Cypress Semiconductor Corporation
Document Number: 002-08404 Rev *A
• 198 Champion Court • San Jose, CA 95134-1709 •
408-943-2600
Revised February 4, 2016
1 page  
MB39C831
3. Block Diagram
Figure 3-1 Block Diagram
L1
C1 LX
VDD VCC
VDD
MPPT_ENA
ENA
S0
S1
S2
VDD voltage
detector
(UVLO)
VCC voltage
detector
VOUT voltage
detector
VOUT-VDD
voltage
inversion
detector
BGR
LOGIC
Start-Up
Boost DC/DC Converter
VCC
PFM/PWM
Controler
VCC
MPPT
Controler
VST
D1 C11
VCC
D2 C2
SW1
SW2 VOUT
VOUT_S
C3 (*1)
C9
FB
Li-ion
Battery
DET0
DET1
MPPT_OUT R3
C8 C7 C6 C5 C4
R1 R2 C10
*1: Connect the Li-ion battery in the charge mode (refer to Figure 8-2)
Document Number: 002-08404 Rev *A
Page 5 of 40
5 Page 
MB39C831
Charge Mode: MPPT_ENA = H, ENA = H
In order to operate the charge mode, it supposes that to connect lithium ion secondary batteries, and so on, to VCC pin. See
Figure 11-2 circuit to use the charge mode.
The charge mode is necessary to set MPPT_ENA = H and ENA = H. Both MPPT_ENA and ENA are connected to the VCC
pin, and a Li-ion battery should be connected to the VOUT pin to make the VOUT ≥ 2.6V (upper threshold of VOUT detection
voltage 2: VOUTDETH2). See Figure 10-2 Start-up/shut-down sequences of charge mode.
Figure 7-2 Start-up/Shut-down Sequences of Charge Mode (MPPT_ENA = H, ENA=H)
Release Voltage
0.35V
VDD Voltage 0V
0.2V
0V
VST
startup voltage 0V
VCC Voltage
0V
2.6V
VOUT=Li-ion Voltage(>=2.6V)
VOUT Voltage
0V
VCC=VOUT
4V VCC=VOUT
3.7V
4V
3.7V
Battery Charging Operation
2.55V
0V
2.55V
VOUT=Li-ion Voltage(>=2.55V)
0V
LX
switching
VCC-VOUT
SW1
OFF
CSH1
0V
CSH2
0V
VCC/2
VCC/2
DET1
0V
ON
OFF
0V
0V
Same as VCC Voltage
0V
DET0
0V
U S R M RM
[1] [2]
[3],[4]
M RM
[5]
UU
[6]
0V
Mark
U
S
R
M
State
UVLO
Start-Up
Release Voltage
MPPT Charge
[1] When 0.35V (Minimum input voltage at start-up: VSTART) or higher voltage is applied to the VDD pin, the start-up circuit
activates charging the VCC capacitor C2 (see Figure 3-1).
[2] When the VCC reaches 2.6V (upper threshold of VCC detection voltage 2: VCCDETH2) and the VOUT is higher than 2.6V
(upper threshold of VOUT detection voltage 2: VOUTDETH2), the operation of the start-up circuit stops and the internal switch
SW1 (see Figure 3-1) between VCC and VOUT is turned on. Then the DC/DC converter activates charging the Li-ion battery
(see Figure 3-1), and the MPPT control starts at the same time.
[3] While the DC/DC converter is continuously operated, the voltage of VDD is controlled to the MPPT value setting by S0, S1,
and S2 pins. (For more detail, refer to Chapter 7.3).
[4] When the voltage of the Li-ion battery reaches 4V (upper threshold of VOUT detection voltage 3: VOUTDETH3), the
charging of the Li-ion battery stops. When the voltage of the Li-ion battery drops and reaches 3.7V (lower threshold of VOUT
detection voltage 3: VOUTDETL3), the charging of the Li-ion battery starts again.
[5] When the VDD voltage drops and reaches 0.2V (lower threshold of UVLO detection voltage: VUVLOL), the operation of the
DC/DC converter stops, and then the voltage of the VOUT and VCC starts to decreases.
Document Number: 002-08404 Rev *A
Page 11 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MB39C831.PDF ] | |
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