Typical operating characteristics – Rainbow Electronics MAX1729 User Manual
Page 4
MAX1729
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
4
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
0
0.01
10
1
0.1
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 9.4 (CTLIN AT 50% DUTY CYCLE)
20
10
30
60
50
40
MAX1729 toc 01
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5.5V
V
IN
= 2.7V
0
0.01
10
1
0.1
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 16.4 (CTLIN = IN)
20
10
30
60
50
40
MAX1729 toc 02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5.5V
V
IN
= 2.7V
0.05
0.15
0.10
0.25
0.20
0.35
0.30
0.40
2.5
3.5
4.0
3.0
4.5
5.0
5.5
6.0
NO-LOAD SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX1729 toc 03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
V
OUT
= 16.4V
V
OUT
= 9.4V
V
OUT
= 2.5V
0
2
1
4
3
6
5
7
2.5
3.5
4.0
3.0
4.5
5.0
5.5
6.0
MAXIMUM OUTPUT CURRENT vs.
SUPPLY VOLTAGE
MAX1729 toc 04
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
V
OUT
= +2.5V
V
OUT
= 9.4V
V
OUT
= 16.4V
0
4
2
8
6
10
12
16
14
18
0
20 30 40
10
50 60 70 80 90 100
OUTPUT VOLTAGE vs.
DUTY CYCLE
MAX1729 toc 07
DUTY CYCLE (%)
OUTPUT VOLTAGE (V)
0
-100
1
10
100
1k
10k
100k
PS TO OUT (LDO)
POWER-SUPPLY REJECTION RATIO
-80
MAX1729 toc 05
FREQUENCY (Hz)
PSRR (dB)
-60
-40
-20
0
1.0
0.5
2.0
1.5
2.5
3.0
2.5
4.0
4.5
3.0
3.5
5.0
5.5
6.0
SHUTDOWN SUPPLY CURRENT
MAX1729 toc 06
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (
µ
A)
20ms/div
START-UP DELAY FROM SHUTDOWN
V
CTLIN
5V/div
V
REF
1V/div
V
TC
1V/div
V
OUT
10V/div
MAX1729 toc 08
V
IN
= 5V
I
O
= 0.5mA
500ms/div
DELAY TO SHUTDOWN
V
CTLIN
5V/div
V
REF
1V/div
V
TC
1V/div
V
OUT
10V/div
MAX1729 toc 09a
V
IN
= 5V
I
O
= 0.5mA