Typical operating characteristics (continued) – Rainbow Electronics MAX1692 User Manual
Page 5
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
_______________________________________________________________________________________
5
600
650
700
750
800
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
MAX1692-11
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
I
OUT
= 200mA
2.7
3.9
4.3
3.1
3.5
4.7
5.1
5.5
0.5
0.8
1.1
1.4
2.7
3.9
4.3
3.1
3.5
4.7
5.1
5.5
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
MAX1692-12
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (A)
V
OUT
= 1.8V
LIM = IN
LIM = GND
500
µ
s/div
LOAD-TRANSIENT RESPONSE
V
LX
5V/div
V
OUT
AC-COUPLED
100mV/div
I
OUT
2.5A/div
MAX1692-17
I
LOAD
= 30mA to 700mA
2ms/div
START-UP FROM SHUTDOWN
V
SHDN
2V/div
I
IN
0.5A/div
V
OUT
1V/div
MAX1692-14
2ms/div
HEAVY LOAD SWITCHING WAVEFORMS
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 700mA
V
LX
5V/div
I
LX
0.5A/div
V
OUT
AC-
COUPLED
100mV/div
MAX1692-15
2ms/div
LINE-TRANSIENT RESPONSE
V
IN
= 3V to 5V, I
OUT
= 300mA
V
IN
AC-
COUPLED
2V/div
V
OUT
AC-
COUPLED
50mV/div
MAX1692-18
2ms/div
RECOVERY FROM 100% DUTY CYCLE
V
IN
= 3.3V to 4.5V , V
OUT
= 3.3V, I
OUT
= 500mA
V
IN
2V/div
V
LX
5V/div
V
OUT
AC-
COUPLED
500mV/div
MAX1692-19
Typical Operating Characteristics (continued)
(SYNC/PWM = GND, T
A
= +25°C, unless otherwise noted.)
100kHz
1MHz
10MHz
SWITCHING HARMONICS AND NOISE
1mV/div
MAX1692-22
1ms/div
I
OUT
= 500mA