Lo w -Vo lt a g e , P re c is io n S t e p -Do w n
Co n t ro lle r fo r P o rt a b le CP U P o w e r
MAX136
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 1, V = 7V, T = +25°C, unless otherwise noted.)
IN
A
LOAD-TRANSIENT RESPONSE
(1.8V, PWM MODE)
SWITCHING WAVEFORMS
(PWM MODE)
V
OUT
V
OUT
50mV/div
20mV/div
5V
0V
1A
0A
V
LX
10A
5A LOAD CURRENT
0A
INDUCTOR
CURRENT
100µs/div
1µs/div
SWITCHING WAVEFORMS
(DROPOUT OPERATION)
SWITCHING WAVEFORMS
(PFM MODE)
V
OUT
= 5V
V
OUT
= 1.8V
V
V
OUT
OUT
20mV/div
50mV/div
5V
0
5V
0V
1A
0A
V
LX
V
LX
INDUCTOR
CURRENT
4A
INDUCTOR
CURRENT
2A
0A
5µs/div
20µs/div
OVERVOLTAGE-PROTECTION WAVEFORMS
STANDBY AND STARTUP RESPONSE
(V SHORTED TO V
IN
OUT
(V = 1.8V, NO LOAD)
OUT
THROUGH a 0.5Ω RESISTOR)
V
OUT
V
OUT
100mV/div
1V/div
5V
0
V
DL
0
V
SHDN
INDUCTOR
CURRENT
5V/div
-5A
-10A
1ms/div
10µs/div
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
