Typical operating characteristics (continued) – Rainbow Electronics MAX17031 User Manual
Page 9
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
_______________________________________________________________________________________
9
STANDBY AND SHUTDOWN INPUT
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX17031 toc10
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
20
5
10
15
0.01
0.1
0.001
0
25
I
CC
+ I
DD
STANDBY
(ONLDO = RTC, ON1 = ON2 = GND)
SHUTDOWN
(ONLDO = ON1 = ON2 = GND)
REFERENCE OFFSET
VOLTAGE DISTRIBUTION
MAX17031 toc11
2V OFFSET VOLTAGE (mV)
SAMPLE PERCENTAGE (%)
12
-12
-4
4
50
40
70
60
20
10
30
0
-20
20
T
A
= +85
°C
T
A
= +25
°C
SAMPLE SIZE = 150
100mV ILIM THRESHOLD
VOLTAGE DISTRIBUTION
MAX17031 toc12
ILIM THRESHOLD VOLTAGE (mV)
SAMPLE PERCENTAGE (%)
106
94
98
102
40
50
20
10
30
0
90
110
SAMPLE SIZE = 150
T
A
= +85
°C
T
A
= +25
°C
LDO AND RTC POWER-UP
MAX17031 toc13
A. INPUT SUPPLY, 5V/div
B. 5V LDO, 2V/div
C. 3.3V RTC, 2V/div
D. 1.0 REF, 1V/div
200
µs/div
0V
0V
0V
0V
12V
A
12V
B
5V
C
3.3V
D
2.0V
LDO AND RTC POWER REMOVAL
MAX17031 toc14
A. INPUT SUPPLY, 5V/div
B. 5V LDO, 2V/div
C. 3.3V RTC, 2V/div
D. 2.0 REF, 1V/div
200
µs/div
5V
3.3V
2V
12V
A
12V
B
5V
C
3.3V
D
2.0V
5V LDO LOAD TRANSIENT
MAX17031 toc15
A. LDO OUTPUT, 100mV/div
B. LDO CURRENT, 100mA/div
4
µs/div
5V
0.1A
0A
A
B
5V SMPS STARTUP AND SHUTDOWN
MAX17031 toc16
A. 5V LDO OUTPUT, 0.2V/div
B. 5V SMPS OUTPUT, 2V/div
C. ON1, 5V/div
200
µs/div
5V
5V
5V
0V
0V
A
5V
B
5V
C
C. PGOOD, 5V/div
D. INDUCTOR CURRENT,
5A/div
STARTUP WAVEFORMS
(SWITCHING REGULATORS)
MAX17031 toc17
A. ON1, 5V/div
B. 5V SMPS OUTPUT,
2V/div
200
µs/div
5V
5V
5V
0A
0V
0V
0V
A
B
5V
D
C
SKIP MODE
C. PGOOD, 2V/div
D. INDUCTOR CURRENT,
5A/div
SHUTDOWN WAVEFORMS
(SWITCHING REGULATORS)
MAX17031 toc18
A. ON1, 5V/div
B. 5V SMPS OUTPUT,
2V/div
200
µs/div
5V
5V
0A
0V
0V
0V
A
B
D
C
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V, T
A
= +25°C, unless otherwise noted.)