Typical operating characteristics – Rainbow Electronics MAX1664 User Manual
Page 4
MAX1664
Active-Matrix Liquid Crystal Display
(AMLCD) Supply
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(f
BPCLK
= 22.5kHz, FPLL = GND, L1 = 3.3µH, L2 = 4.7µH, T
A
= +25°C, unless otherwise noted.)
100
0
1
10
100
1000
DC-DC 1 EFFICIENCY vs. LOAD CURRENT
(V
OUT1
= +5V)
20
MAX1664 TOC01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
90
10
30
50
70
V
IN
= 3V
V
IN
= 4.5V
100
0
1
10
100
DC-DC 2 EFFICIENCY vs. LOAD CURRENT
(V
OUT2-
= -5V)
20
10
MAX1664 TOC02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
30
60
70
50
80
90
V
OUT2+
UNLOADED
V
IN
= 5V
V
IN
= 3.3V
100
0
1
10
100
DC-DC 2 EFFICIENCY vs. LOAD CURRENT
(V
OUT2+
= +15V)
20
10
MAX1664 TOC03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
30
60
70
50
80
90
V
OUT2-
UNLOADED
V
IN
= 5V
V
IN
= 3.3V
10mV/div
V
OUT1
RIPPLE
MAX1664 TOC04
I
OUT1
= 250mA, L = 3.3
µ
H
500ns/div
V
OUT2
100mV/
div
V
OUT2+
RIPPLE
MAX1664 TOC05
2
µ
s/div
V
OUT2+
= 15V, V
IN
= 3.3V, I
LOAD
= 9mA,
C
OUT2
= 0.22
µ
F, AC COUPLED
V
OUT2-
50mV/
div
V
OUT2-
RIPPLE
MAX1664 TOC06
5
µ
s/div
V
OUT2-
= -5V, V
IN
= 3.3V, I
LOAD
= 5mA,
C
OUT2-
= 0.47
µ
F, AC COUPLED