MAX1534 Datasheet, PDF (7/16 Pages) Maxim Integrated Products – High-Efficiency, Triple-Output, Keep-Alive Power Supply for Notebook Computers

High-Efficiency, Triple-Output, Keep-Alive
Power Supply for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V_IN = +12V, PRESET = GND, T_A = +25°C, unless otherwise noted.)
LDO DROPOUT VOLTAGE
vs. LOAD CURRENT
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80
I_OUT1 (mA)
LDO DROPOUT VOLTAGE vs. V_OUT1
120
100
80
60
40
20
I_OUT1 = 80mA
0
2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3
V_OUT1 (V)
70
60
50
40
30
20
10
0
0.01
LDO PSRR vs. FREQUENCY
100Ω LOAD
0.1
1
10
100
FREQUENCY (kHz)
LDO LOAD TRANSIENT
MAX1534 toc15
V_OUT1
20mV/div
AC-COUPLED
150mA
0
20µs/div
V_LDOIN = 5V, I_OUT1 = 10mA TO 150mA
I_OUT1
50mA/div
STARTUP WAVEFORMS
MAX1534 toc16
SHDN
5V/div
0
V_OUT3
2V/div
V_OUT1
0
2V/div
0
V_OUT2
2V/div
0
POK
0
5V/div
1A
I_LX
0
1A/div
100µs/div
V_IN = 12V, R_OUT1 = 33Ω, R_OUT2 = 18Ω, R_OUT3 = 50Ω
SHUTDOWN WAVEFORMS
MAX1534 toc17
SHDN
5V/div
0
4V
V_OUT3
V_OUT1
V_OUT2
0
V_{OUT_}
2V/div
0
POK
5V/div
1A
0
I_LX
1A/div
100µs/div
V_IN = 12V, R_OUT1 = 33Ω, R_OUT2 = 18Ω, R_OUT3 = 50Ω
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