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162
8048C–AVR–02/12
ATtiny43U
20.7
Boost Converter Characteristics
Note:
1. Characteristics obtained with the setup described in section “Boost Converter” on page 168.
2. Minimum shutdown voltage is not guaranteed. At very low battery voltages the logic may cease to operate before issuing a
stop signal. Application firmware can use the ADC to monitor battery voltage at regular intervals and issue a firmware stop
when required.
Table 20-7.
Characteristics of Boost Converter. T = -20
°C to +85°C, unless otherwise noted
Symbol
Parameter
Condition (1)
Min
Typ
Max
Unit
VBAT
Input Voltage
0.7
1.8
V
START
Start Voltage
1.0
1.2
1.35
V
VSTOP
Shutdown Voltage
– (2)
0.5
0.8
V
VBOOST
1.0
V
VCC
Output Voltage
Active Mode, I
LOAD > 1mA
2.7
3.0
3.3
V
Low Current Mode
2.0
3.6
V
ILOAD
Load Current
VBAT = 0.7V
0
10
mA
V
BAT = 1.0V
0
30
mA
VRPP
Output Voltage Ripple
VBAT = 1.0V, ILOAD = 30 mA, CLOAD = 22 F
40
mV
tSTART
Start-up Time
VBAT = Step Change from 0V to 1.2V
2
ms
IIN
Current consumption of entire
device
V
BAT = 0.4V, Converter in Stop Mode
MCU not powered
1A
VBAT = 1.0V, Converter in Stop Mode
MCU not powered
2A
VBAT = 1.2V, Active Low Current Mode
MCU in Power Down, WD disabled
5A
V
BAT = 1.2V, Active Regulated Mode
MCU active, 4 MHz
5mA
f
SW
Switching frequency
75
100
125
kHz
T
SW
Switching period
T
S = 1 / fSW
8
10
13.3
s
DSW
Duty Cycle
370
%
VBATOL
Lowest V
BAT voltage where device
recovers from overload
Output overload or short circuit removed
0.9
V
Load Regulation:
T = 25
°C, V
BAT = 1.2V
Boost converter in Active Mode
2.7
%
Line Regulation:
T = 25
°C, I
LOAD = 1mA
Boost converter in Active Mode
1.0
%
Temperature Regulation:
VBAT = 1.2V, ILOAD = 1mA
Boost converter in Active Mode
2.3
%
V
CC
LOADMIN
V
CC
LOADMAX
–
V
CC
LOADMAX
-----------------------------------------------------------------------------
V
CC
VBATMAX
V
CC
VBATMIN
–
V
CC
VBATNOM
---------------------------------------------------------------------------
V
CC
TEMPMAX
V
CC
TEMPMIN
–
V
CC
TEMPNOM
-----------------------------------------------------------------------------
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