Rainbow Electronics MAX8508 - Manual (Page 5)

MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75m Ω
Bypass FET for WCDMA and cdmaOne Handsets
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MAX8506 toc09
400µs/div
V LX
2V/div
V
OUT
AC-COUPLED
5mV/div
LIGHT-LOAD SWITCHING WAVEFORM
IN PWM MODE
V OUT = 0.4V
LOAD = 10Ω
LIGHT-LOAD SWITCHING WAVEFORM
IN NORMAL MODE
MAX8506 toc10
1µs/div
V LX
2V/div
V
OUT
AC-COUPLED
20mV/div
V OUT = 0.4V
LOAD = 10Ω, SKIP = GND
EXITING AND ENTERING SHUTDOWN
MAX8506 toc11
100µs/div
V OUT
1V/div
SHDN
2V/div
V OUT = 1.8V, R LOAD = 10Ω
REFIN TRANSIENT RESPONSE
MAX8506 toc12
20µs/div
V OUT
1V/div
0
0
REFIN
1V/div
SKIP = GND
SKIP = BATT
V REFIN = 0.284V TO 1.420V
HP TRANSIENT RESPONSE
MAX8506 toc13
20µs/div
V OUT
1V/div
1.8V
0
HP
1V/div
SKIP = GND
SKIP = BATT
V OUT = 1.8V, R LOAD = 10Ω
LINE TRANSIENT RESPONSE
MAX8506 toc14
20µs/div
V IN
200mV/div
3.4V
V OUT
AC-COUPLED
20mV/div
V OUT = 1.2V, R LOAD = 10Ω
Typical Operating Characteristics (continued)
(V BATT = V BATTP = 3.6V, SHDN = SKIP = BATT, HP = GND, T A = +25°C, unless otherwise noted.) (See the Typical Application Circuits.)