Typical operating characteristics – Rainbow Electronics MAX1765 User Manual
Page 7
MAX1765
800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
_______________________________________________________________________________________
7
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
0
0.001
1
0.1
0.01
TRACK MODE EFFICIENCY vs. LOAD CURRENT
(V
OUTL
= +5V)
30
10
70
50
90
40
20
80
60
MAX1765 toc05
LOAD CURRENT (A)
EFFICIENCY (%)
VIN = +1.2V
V
IN
= +1.2V
V
IN
= +3.6V
NORMAL MODE
V
IN
= +2.4V
VIN = +3.6V
V
IN
= +2.4V
PWM
MODE
0
0.05
0.10
0.15
0.20
0.25
0.30
0
200
100
300 400 500 600 700 800
LINEAR REGULATOR DROPOUT
VOLTAGE vs. LOAD CURRENT
MAX1765 toc07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (V)
V
OUTL
= +2.5V
V
OUTL
= +2.85V
V
OUTL
= +5V
0
1
1000
100
10
STARTUP INPUT VOLTAGE
vs. OUTPUT CURRENT
2.5
1.0
0.5
2.0
1.5
MAX1765 toc08
OUTPUT CURRENT (mA)
STARTUP INPUT VOLTAGE (V)
T
A
= +25
°C
T
A
= -40
°C
T
A
= +85
°C
0
4
2
10
8
6
16
14
12
18
0
1.0
1.5
0.5
2.0
2.5
3.0
3.5
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1765 toc09
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
FPWM MODE
NORMAL MODE
0.9
0
0.001
1
0.1
0.01
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +3.3V)
0.3
0.1
0.7
0.5
1.0
0.4
0.2
0.8
0.6
MAX1765 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
V
IN
= +2.4V
NORMAL
MODE
V
IN
= +1.2V
V
IN
= +2.4V
V
IN
= +1.2V
PWM
MODE
90
0
0.001
1
0.1
0.01
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +5V)
30
10
70
50
100
40
20
80
60
MAX1765 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
PWM
MODE
V
IN
= +1.2V
V
IN
= +2.4V
V
IN
= +3.6V
V
IN
= +3.6V
NORMAL MODE
V
IN
= +2.4V
V
IN
= +1.2V
90
0
0.001
1
0.1
0.01
TRACK MODE EFFICIENCY vs. LOAD CURRENT
(V
OUTL
= +2.85V)
30
10
70
50
100
40
20
80
60
MAX1765 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
NORMAL MODE
V
IN
=
+1.2V
V
IN
= +2.4V
V
IN
= +1.2V
V
IN
= +2.4V
PWM
MODE
0
0.001
1
0.1
0.01
TRACK MODE EFFICIENCY vs. LOAD CURRENT
(V
OUTL
= +3.3V)
30
10
70
50
90
40
20
80
60
MAX1765 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
VIN = +1.2V
V
IN
= +1.2V
VIN = +2.4V
VIN = +3.6V
VIN = +2.4V
NORMAL
MODE
NORMAL MODE/
PWM MODE
PWM
MODE
0
600
400
200
800
1000
1200
0
2.0
1.5
0.5 1.0
2.5 3.0 3.5 4.0 4.5 5.0
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1765 toc06
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
V
OUT
= +5V, I
SET
= REF
V
OUT
= +3.3V, I
SET
= REF
V
OUT
= +3.3V, I
SET
= 0.5 REF
V
OUT
= +5V, I
SET
= 0.5 REF