Typical operating characteristics, Electrical characteristics – Rainbow Electronics MAX1643 User Manual
Page 3
MAX1642/MAX1643
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
_______________________________________________________________________________________
3
Note 2:
Start-up guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-times, off-times, and
output voltage trip points).
Note 3:
. This guarantees discontinuous conduction.
Note 4:
Specifications to -40°C are guaranteed by design, not production tested.
t
=
t
x V
V
- V
x RATIO
OFF
ON
BATT
OUT
BATT
Falling PFI, hysteresis = 1%
V
BATT
= 1.0V (MAX1642)
0.9V < V
BATT
< 1.5V (t
ON
= K / V
BATT
)
V
OUT
= 3.5V (MAX1642)
V
OUT
= 3.3V
V
FB
< 0.1V
External feedback
V
OUT
= 3.5V
V
OUT
= 3.3V
CONDITIONS
mV
550
662
PFI Trip Voltage
µA
3.5
I
SHDN,BATT
Shutdown Current into BATT
µA
1
I
SHDN,OUT
Shutdown Current into OUT
µA
6.5
I
QBATT
Quiescent Current into BATT
µA
18
I
QOUT
Quiescent Current into OUT
V-µs
12.4
38.2
K
On-Time Constant
Ω
2.2
P-Channel On-Resistance
V
2.99
3.56
V
OUT
Output Voltage
V
1.11
1.32
V
FB
FB Set Voltage
Ω
1.5
N-Channel On-Resistance
UNITS
MIN
MAX
SYMBOL
PARAMETER
ELECTRICAL CHARACTERISTICS
(V
BATT
= V
SHDN
= 1.3V, I
LOAD
= 0mA, FB = GND,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 4)
Falling V
BATT
, V
OUT
= 3.3V, hysteresis = 2%
(MAX1643)
V
0.93
1.06
BATTLO Trip Voltage
__________________________________________Typical Operating Characteristics
(Circuit of Figure 4, V
BATT
= 1.2V, R1 + R2 = 1M
Ω
, T
A
= +25°C, unless otherwise noted.)
0
0.01
1
10
0.1
100
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 2.4V)
10
MAX1642/43 TOC01A
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 1.6V
L1 = 100
µ
H
SUMIDA CD54-101
V
IN
= 1.2V
V
IN
= 0.85V
V
IN
= 1.0V
20
30
40
50
60
70
80
90
100
0
0.01
1
10
0.1
100
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 2.4V)
10
MAX1642/43 TOC01B
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 1.6V
L1 = 150
µ
H
TDK NLC565050T-151K
V
IN
= 1.2V
V
IN
= 0.85V
V
IN
= 1.0V
20
30
40
50
60
70
80
90
100
0
0.01
1
10
0.1
100
EFFICIENCY vs. OUTPUT CURRENT
(V
OUT
= 3.3V)
10
MAX1642/43 TOC02A
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 1.6V
L1 = 100
µ
H
SUMIDA CD54-101
V
IN
= 1.2V
V
IN
= 0.85V
V
IN
= 1.0V
20
30
40
50
60
70
80
90
100