MAX1661 Datasheet, PDF (6/16 Pages) Maxim Integrated Products – Active-Matrix Liquid Crystal Display AMLCD Supply

Active-Matrix Liquid Crystal Display
(AMLCD) Supply
Typical Operating Characteristics (continued)
(f_BPCLK = 22.5kHz, FPLL = GND, L1 = 3.3µH, L2 = 4.7µH, T_A = +25°C, unless otherwise noted.)
BPCLK TO BPDRV FALLING DELAY
BPCLK TO BPDRV RISING DELAY
MAX1664 TOC14(a))
BPDRV
BPCLK
5V/div
2V/div
BPCLK
BPDRV
2V/div
5V/div
100ns/div
C_LOAD = 10,000pF
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
INCLUDES ALL
EXTERNAL COMPONENT
CURRENTS
123456
INPUT VOLTAGE (V)
DC-DC 1 SWITCHING WAVEFORMS
MAX1664 TOC17(a)
100ns/div
C_LOAD = 10,000pF
SHDN
V_REF
V_OUT1
V_OUT2-
OUT-OF-SHUTDOWN SEQUENCE
MAX1664 TOC16(a)
5V/div
2V/div
5V/div
5V/div
V_OUT2+
RDY
500µs/div
10V/div
5V/div
DC-DC 2 SWITCHING WAVEFORMS
DISCONTINUOUS CONDUCTION
V_LX1
I_LI
500ns/div
I_OUT1 = 300mA, L1 = 3.3µH
5V/div
500mA/div
V_LX2N
V_LX2P
5V/div
5V/div
I_L2
500mA/
div
1µs/div
V_IN = 3.3V; V_OUT2+ = 15V/8mA, V_OUT2- = -5V/10mA
NOTE: LX2N, LX2P PULSES ARE SYNCHED TO DC-DC 1
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