Typical operating characteristics (continued) – Rainbow Electronics MAX1664 User Manual
Page 6
MAX1664
Active-Matrix Liquid Crystal Display
(AMLCD) Supply
6
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(f
BPCLK
= 22.5kHz, FPLL = GND, L1 = 3.3µH, L2 = 4.7µH, T
A
= +25°C, unless otherwise noted.)
V
IN
= 3.3V; V
OUT2+
= 15V/8mA, V
OUT2-
= -5V/10mA
NOTE: LX2N, LX2P PULSES ARE SYNCHED TO DC-DC 1
DC-DC 2 SWITCHING WAVEFORMS
DISCONTINUOUS CONDUCTION
V
LX2N
V
LX2P
I
L2
5V/div
500mA/
div
1
µ
s/div
5V/div
C
LOAD
= 10,000pF
BPCLK TO BPDRV FALLING DELAY
BPCLK
BPDRV
2V/div
5V/div
100ns/div
MAX1664 TOC14
5V/div
2V/div
BPDRV
BPCLK
100ns/div
BPCLK TO BPDRV RISING DELAY
MAX1664 TOC14(a))
C
LOAD
= 10,000pF
0
0.4
0.2
1.0
0.8
0.6
1.6
1.4
1.2
1.8
0
2
1
3
4
5
6
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1664 TOC15
INPUT VOLTAGE (V)
NO-LOAD SUPPLY CURRENT (mA)
INCLUDES ALL
EXTERNAL COMPONENT
CURRENTS
5V/div
2V/div
5V/div
5V/div
10V/div
5V/div
SHDN
V
REF
V
OUT2-
V
OUT2+
RDY
V
OUT1
500
µ
s/div
OUT-OF-SHUTDOWN SEQUENCE
MAX1664 TOC16(a)
5V/div
500mA/div
V
LX1
I
LI
I
OUT1
= 300mA, L1 = 3.3
µ
H
500ns/div
DC-DC 1 SWITCHING WAVEFORMS
MAX1664 TOC17(a)