Datasheet

MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
6 _______________________________________________________________________________________
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
40µs/div
LOAD-TRANSIENT RESPONSE
A
B
C
V
IN
= 5V, V
OUT
= 3.3V, 
LOAD = 0mA TO 500mA, PWM MODE
A: LX, 5V/div
B: V
OUT
, 50mV/div, AC COUPLED
C: LOAD CURRENT, 500mA/div

MAX887-16
200µs/div
LINE-TRANSIENT RESPONSE
A
B
V
IN
= 5V TO 11V, V
OUT
= 3.3V, 
LOAD = 500mA, PWM MODE
A: V
IN
, 5V/div
B: V
OUT
, 20mV/div, AC COUPLED

MAX887-17
200µs/div
RECOVERY FROM 100% DUTY CYCLE
(DROP OUT)
A
B
C
V
IN
= 3.3V TO 11V, V
OUT
= 3.3V, 
LOAD = 500mA, PWM MODE
A: V
IN
, 5V/div
B: V
OUT
, 50mV/div, AC COUPLED
C: LX, 10V/div

MAX887-18
500µs/div
SHUTDOWN AND STARTUP RESPONSE
A
B
C
D
V
IN
= 5V, V
OUT
= 3.3V, 
LOAD = 100mA, PWM MODE
A: SHDN, 5V/div
B: V
OUT
, 2V/div, AC COUPLED
C: LX, 5V/div
D: INDUCTOR CURRENT, 500mA/div

MAX887-19