MAS6011 - Micro Analog Systems Oy

DA6011B.001
18 October, 2011
MAS6011B
Solar Cell Energy Harvesting
System Manager
VDD
•
•
•
•
MAS6011
XPD
LB
Ultra Low Power, 110nA
Low Battery Indicator
Precise Power Up/Down
Battery Overcharging
Protection
SW
SOL
GND
DESCRIPTION
The MAS6011 solar cell system manager monitors
the supply voltage and charging of a batterypowered system containing a small solar cell. The
current consumption of this IC is extremely low, 110
nA, which means the system can charge from very
low light conditions and also stay in power down
mode for years and still operate directly from the
battery before recharging.
To be able to charge a battery also in condition with
very limited light, a large solar cell is usually used.
This can on the other hand easily destroy the
battery due to over voltage during strong sun light.
MAS6011 solves this dilemma and will give secure
FEATURES
•
•
•
•
•
•
•
Ultra Low Current Consumption, typ 110nA
Low Supply Voltage Operation, min 2.0V
Battery Overcharging Protection
Power On Indicator and secure Power ON after
shut down
Deep discharge protection of battery during
shut down mode
Precise Shut Down and precise Low Battery
warning threshold levels
Suitable for rechargeable 3V Lithium Vanadium
Pentoxide (VL-type) batteries
protection of a secondary 3V battery over a big
range of light strengths (lx).
Three output signals indicate the state of the
system. Power Down (XPD) indicates whether the
supply voltage is high enough to power up and run
the system. Low Battery (LB) is used to signal the
condition when the battery capacity is low and
when to move to power saving mode. The third
signal, SOL, is used for battery charging control.
When the battery is full it bypasses the charging
current by an internal shunt switch to avoid
overcharging. The SW pin can also be used to
control an external shunt switch for higher currents.
APPLICATIONS
•
•
•
•
•
•
•
Solar Powered Watch
Solar Powered Wireless Sensor
Solar Powered Devices with Back-Up
GPS Modules
Time Code Receiver modules
Electronic locks
Energy Harvesting
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18 October, 2011
FUNCTIONAL DESCRIPTION
The solar manager generates three main signals:
XPD (Power Down), LB (Low Battery) and SOL
(Solar Charging). The fourth SW signal is for
controlling an optional external PMOS transistor.
These signals are produced by three comparators
which have hysteresis build in. Each comparator
compares the supply voltage (VDD) to the internal
switching levels. The current consumption of the
comparators is extremely low. The electrical
parameters are described more detailed in the
Electrical Characteristics chapter.
The XPD signal can be used to power down the
whole system whenever the supply voltage level
has dropped too low (see application figure 4).
When the supply voltage is too low the XPD goes
low to power down the solar powered system.
When the supply voltage is high enough the XPD
goes high controlling power up condition.
For a low power system (max current consumption
1mA) the XPD pin output can be used as a system
supply voltage (see application figure 5) to keep the
systems current consumption to a minimum.
The LB signal indicates that the battery is low but
not empty. It can be used to control the system into
a power saving mode. In power on (XPD=high) LB
goes high when supply voltage level is too low and
LB goes low when supply voltage level is high
enough. In power down (XPD=low) the LB is low.
SOL is used for controlling the charging of the
rechargeable battery. Normally the internal PMOS
switch between VDD and the SOL pin is non-
conductive but when the power supply voltage rises
too much this switch is switched on to shunt the
solar cell charging current and to prevent battery
overcharging. The maximum shunt current
capability of the internal PMOS switch is typically
28 mA. If a larger shunt current is needed an
external PMOS transistor can be used controlled by
the SW pin (see application figure 6).
In operation without an external Schottky diode
between the pins SOL and GND, the voltage at pin
SOL is clamped to about 700 mV below GND by an
internal diode-connected NPN transistor.
MAS6011 does not have any control pin. After the
power supply is connected the device is ready to be
used.
The XPD, LB and SOL/SW switching levels have
been designed for usage with VL-type rechargeable
lithium vanadium pentoxide batteries.
Those
batteries are compact, high energy secondary
batteries that have nearly twice the energy of
conventional button-shaped Ni-Cd batteries. The
self discharge rate is less than 2% a year which
makes them very useful as a power source in
systems that might be stored for a long time without
re-charging.
Figure 1 illustrates the MAS6011 functions and
shows the comparator switching levels for both
battery charging (rising VDD) and discharging
(falling VDD) conditions.
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FUNCTIONAL DESCRIPTION
VDD
3.3V
SOL_OFF (charging off)
3.2V
SOL_ON (charging on)
3.1V
3.0V
BATTERY CHARGING
(VDD RISING)
BATTERY DISCHARGING
(VDD FALLING)
2.9V
Battery Voltage
2.8V
2.7V
2.6V
LB_OFF (LB=low)
XPD_OFF (XPD=high)
LB_ON
(LB=high)
2.5V
2.4V
XPD_ON
(XPD=low)
2.3V
2.2V
2.1V
2.0V
SOL
LB
XPD
SW
Figure 1. MAS6011 functions
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ABSOLUTE MAXIMUM RATINGS
All voltages with respect to ground.
Parameter
Supply Voltage
Voltage range for all pins
Operating temperature
Storage Temperature
Symbol
Conditions
VDD
TA
TS
Min
Max
Unit
-0.3
-0.3
-40
-50
5.5
VDD+0.3
+85
+125
V
V
o
C
o
C
Stresses beyond those listed may cause permanent damage to the device. The device may not operate under these conditions, but it will
not be destroyed.
This is a CMOS device and therefore it should be handled carefully to avoid any damage by electrostatic voltages (ESD). The most sensitive
pin for the ESD is the SOL pin.
ELECTRICAL CHARACTERISTICS: MAS6011BA1 (3V BATTERY, MCU VDDmin ≤ 2.1V)
Operating Conditions: TA = -40°C to +85°C, typical values at TA = +27°C, unless otherwise specified.
Parameter
Supply voltage
Symbol
VDD
Current consumption
IDD
XPD switching level
XPD_OFF
XPD_ON
VXPD(H)
XPD hysteresis
XPD output voltage
VXPD(OUT)
LB switching level
LB hysteresis
LB_OFF
LB_ON
VLB(H)
LB output voltage
VLB(OUT)
SOL switching level
SOL hysteresis
SOL sink current
Conditions
SOL_OFF
SOL_ON
VSOL(H)
ISOL
SOL leakage current
VDD=2V
VDD=3V
VDD=3.5V
Power Down Off (XPD high)
Power Down On (XPD low)
VDD = 2.1 V,
IXPD = -1mA
Low Battery Off (LB low)
Low Battery On (LB high)
LB high, ILB = -50 µA
LB low, ILB = +50 µA
Solar Charging Off
Solar Charging On
VDD = 3.6 V, SOL = 0 V,
SOL switch On
VDD = 2.9 V
Min
Typ
Max
Unit
2.0
3.0
3.6
V
30
50
60
2.40
2.10
180
85
110
130
2.60
2.30
300
160
200
230
2.80
2.50
600
nA
2.0
2.55
2.35
100
V
mV
V
2.70
2.50
200
2.85
2.65
400
3.02
2.90
50
3.30
3.15
150
0.05
3.55
3.40
300
mV
19
28
43
mA
50
nA
VDD-0.05
V
mV
V
-50
V
LB_OFF – XPD_OFF
VLB_XPD_OFF
10
100
200
mV
LB_ON – XPD_ON
VLB_XPD ON
100
200
300
mV
SOL_OFF – LB_OFF
VSOL_LB_OFF
200
600
800
mV
SOL_ON – LB_ON
VSOL_LB ON
350
650
949
mV
TBD = To be defined
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ELECTRICAL CHARACTERISTICS: MAS6011BA1 (3V BATTERY, MCU VDDmin ≤ 2.1V)
200
180
160
IDD [nA]
140
120
100
VDD=3.5V
80
VDD=3.0V
60
VDD=2.0V
40
20
0
‐50
0
50
100
Temperature [°C]
Figure 2. Typical temperature dependency of IDD
Figure 3. Typical temperature dependency of comparator switching levels
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TYPICAL APPLICATION
VDD
MAS6011
XPD
Solar cells
4.7 µF
LB
POWER
DOWN
VDD
SOLAR
POWERED
SYSTEM
GND
V BATT
3V
+
–
SW
GND
SOL
Schottky
diode:
Vishay
SD103A
or similar.
Figure 4. Typical application circuit of MAS6011BA1 – XPD for power down control of solar powered system
VDD
MAS6011
XPD
Solar cells
4.7 µF
LB
VDD
V BATT
3V
MCU
–
GND
SW
SOL
+
GND
Schottky
diode:
Vishay
SD103A
or similar.
Figure 5. Typical application circuit of MAS6011BA1 – XPD as supply voltage for a low power microcontroller
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TYPICAL APPLICATION
VDD
4.7 µF
MAS6011
Solar cells
XPD
LB
VDD
V BATT
3V
MCU
PMOS
SOL
–
GND
SW
Schottky
diode:
Vishay
SD103A
or similar.
+
GND
Figure 6. Typical application circuit of MAS6011BA1 – external PMOS transistor shunt for solar current
Figure 7. Typical application – Wireless sensor system with Time Code Reception
The system in figure 7 shows a wireless module that can receive both the AM long wave Time Code Signal as
well as measuring different physical parameters via several sensors. The information is transmitted via a low
power RF transmitter to a receiver indoors. By placing the module where the Time Code signal is strong good
reception can be accomplished also in buildings normally blocking this signal. The low power consumption of
the MAS6011 together with the energy harvesting solar cell enables this system to operate without the need for
battery replacement.
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MAS6011BA1 IN QFN 3x3 PACKAGE
QFN 3x3 6ld
GND
SW
XPD
6
5
4
1234
GBA1
YWW
1
2
3
SOL
VDD
LB
Top Marking Information: 1234 = Product
Number, BA1 = Version Number
G = Lead Free, RoHS Compliant
Package, YWW = Year Week
QFN 3x3 PIN DESCRIPTION
Pin Name
Pin
Type
SOL
VDD
LB
XPD
SW
GND
1
2
3
4
5
6
AO
P
DO
DO
DO
G
Function
Solar Charging Output
Positive Power Supply
Low Battery Output
Power Down Output
External Switch Control Output
Power Supply Ground
NC = Not Connected, P = Power, G = Ground, DO = Digital Output, AO = Analog Output
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PACKAGE (QFN 3X3x0.75 6ld) OUTLINE
D
D/2
E/2
TOP VIEW
A3
A
PIN 1 MARK AREA
SIDE VIEW
A1
SEATING
PLANE
D2
D2/2
L
E2
E2/2
SHAPE OF PIN #1
IDENTIFICATION
IS OPTIONAL
BOTTOM VIEW
EXPOSED PAD
e
Symbol
Min
b
Nom
Max
PACKAGE DIMENSIONS
A
0.70
0.75
0.80
A1
0.0
0.02
0.05
A3
0.178
0.203
0.228
b
0.350
0.400
0.450
D
3.00 BSC
D2 (Exposed pad)
2.25
2.3
2.35
E
3.00 BSC
E2 (Exposed pad)
1.45
1.5
1.55
e
0.95 BSC
L
0.425
0.475
0.525
Dimensions do not include mold or interlead flash, protrusions or gate burrs.
Unit
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
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18 October, 2011
ORDERING INFORMATION
Product Code
MAS6011BA1WA305
MAS6011BA1Q1306
Product
Package
Solar Cell System Manager (for 3 V
rechargeable battery)
Solar Cell System Manager (for 3 V
rechargeable battery)
400 μm thick dies on tray
QFN 3x3x0.75mm
Pb-free RoHS compliant
Comments
Tape and Reel
LOCAL DISTRIBUTOR
MICRO ANALOG SYSTEMS OY CONTACTS
Micro Analog Systems Oy
Kutomotie 16
FI-00380 Helsinki, FINLAND
Tel. +358 10 835 1100
Fax +358 10 835 1109
http://www.mas-oy.com
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