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| MAX1692 Datasheet, PDF (5/12 Pages) Maxim Integrated Products – Low-Noise, 5.5V-Input, PWM Step-Down Regulator | |||
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Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Typical Operating Characteristics (continued)
(SYNC/PWM = GND, TA = +25°C, unless otherwise noted.)
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
800
TA = +85°C
750
TA = +25°C
700
TA = -40°C
650
IOUT = 200mA
600
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
HEAVY LOAD SWITCHING WAVEFORMS
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
1.4
LIM = IN
1.1
VSHDN
2V/div
VOUT
1V/div
0.8
LIM = GND
IIN
0.5A/div
VOUT = 1.8V
0.5
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
LOAD-TRANSIENT RESPONSE
START-UP FROM SHUTDOWN
2ms/div
LINE-TRANSIENT RESPONSE
VLX
5V/div
ILX
0.5A/div
VOUT
AC-
COUPLED
100mV/div
2ms/div
VIN = 5V, VOUT = 3.3V, IOUT = 700mA
VLX
5V/div
IOUT
2.5A/div
VOUT
AC-COUPLED
100mV/div
500µs/div
ILOAD = 30mA to 700mA
RECOVERY FROM 100% DUTY CYCLE
VIN
AC-
COUPLED
2V/div
VOUT
AC-
COUPLED
50mV/div
2ms/div
VIN = 3V to 5V, IOUT = 300mA
SWITCHING HARMONICS AND NOISE
VIN
2V/div
VLX
5V/div
VOUT
AC-
COUPLED
500mV/div
1mV/div
2ms/div
VIN = 3.3V to 4.5V , VOUT = 3.3V, IOUT = 500mA
100kHz
IOUT = 500mA
1MHz
1ms/div
10MHz
_______________________________________________________________________________________ 5
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