High-Efficiency, PWM, Step-Down
DC-DC Controllers in 16-Pin QSOP
MAX1652–MAX1655
Typical Operating Characteristics (continued)
(Circuit of Figure 1,
SKIP
= GND, T
A
= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE vs.
LOAD CURRENT (3.3V/3A CIRCUIT)
OUTPUT SET FOR 5V (FB = V
L
)
V
OUT
> 4.85V
DROPOUT VOLTAGE (mV)
400
MAX1652 toc09
500
300
f = 300kHz
200
100
f = 150kHz
0
0.01
0.1
1
10
LOAD CURRENT (A)
PULSE-WIDTH-MODULATION
MODE WAVEFORMS
MAX1652-13
IDLE-MODE WAVEFORMS
MAX1652-14
OUTPUT
VOLTAGE
10mV/div,
AC
OUTPUT
VOLTAGE
50mV/div,
AC
LX
VOLTAGE
5V/div
LX
VOLTAGE
5V/div
TIME (1µs)
V
IN
= 6V, 3.3V/3A CIRCUIT
TIME (2.5µs)
I
LOAD
= 300mA, V
IN
= 10V, 3.3V/3A CIRCUIT
DROPOUT WAVEFORMS
MAX1652-15
LOAD-TRANSIENT RESPONSE
MAX1652-16
OUTPUT
VOLTAGE
10mV/div,
AC
OUTPUT
VOLTAGE
100mV/div,
AC
LX
VOLTAGE
5V/div
LOAD
CURRENT
TIME (5µs)
V
IN
= 5.1V, NO LOAD, 3.3V/3A CIRCUIT,
SET TO 5V OUTPUT (FB = VL)
TIME (10µs)
V
IN
= 15V, 3.3V/3A CIRCUIT
2A/div
8
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
