Rainbow Electronics ATtiny43U - Manual (Page 159)

159
8048B–AVR–03/09
20.7 Boost Converter Characteristics
Table 20-7. Characteristics of Boost Converter. T = -20
°
C ... +85
°
C, unless otherwise noted
Symbol Parameter Condition Min Typ Max Unit
V
START
Start Voltage 1.05 1.2 1.35 V
V
BAT
Input Voltage 0.7 1.8 V
V
STOP
Shutdown Voltage 0.45 0.7 V
V
BOOST
1.0 V
V
CC
Output Voltage
Active Mode, I
LOAD
> 1mA 2.7 3.0 3.3 V
Low Current Mode 1.8 3.6 V
I
LOAD
Load Current
V
BAT
= 0.7V 0 10 mA
V
BAT
= 1.0V 0 30 mA
V
RPP
Output Voltage Ripple V
BAT
= 1.0V, I
LOAD
= 30mA, C
LOAD
= 22µF 100 mV
t
START
Start-up Time V
BAT
= Step Change from 0V to 1.2V 2 ms
I
IN
Current consumption of entire
device
V
BAT
= 0.45V, Converter in Stop Mode
MCU not powered
1 µA
V
BAT
= 1.05V, Converter in Stop Mode
MCU not powered
2 µA
V
BAT
= 1.2V, Active Low Current Mode
MCU in Power Down, WD disabled
5 µA
V
BAT
= 1.2V, Active Regulated Mode
MCU active, 4MHz
5 mA
f
S
Switching frequency 75 100 125 kHz
T
S
Switching period T
S
= 1 / f
S
8 10 13.3 µs
D
SW
Duty Cycle 3 72 %
V
BATOL
Lowest V
BAT
voltage where
device recovers from overload
Output overload or short circuit removed TBD 1.05 TBD 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:
V
BAT
= 1.2V, I
LOAD
= 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
-----------------------------------------------------------------------------