Datasheet

MAX16993 Step-Down Controller with
Dual 2.1MHz Step-Down DC-DC Converters
Maxim Integrated │ 8
www.maximintegrated.com
Typical Operating Characteristics (continued)
(V
SUP
= 14V, T
A
= +25°C, unless otherwise noted)
SPECTRAL ENERGY DENSITY
MAX16993 toc24
FREQUENCY (MHz)
OUTPUT SPECTRUM (dBµV)
2.252.202.152.102.052.001.95
0
10
20
30
40
50
60
-10
1.90 2.30
SS DISABLED
SS ENABLED
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX16993 toc23
V
SUP
(V)
SHUTDOWN CURRENT (µA)
353020 2510 155
1
2
3
4
5
6
7
8
9
10
0
0 40
T
A
= +125ºC
T
A
= +25ºC
T
A
= -40ºC
V
EN1
= V
EN2
= V
EN3
= V
GND
MEASURED AT VSUP
f
SW
vs. TEMPERATURE
MAX16993 toc22
TEMPERATURE (ºC)
SWITCHING FREQUENCY (% NOMINAL)
100500
98
99
100
101
102
103
97
-50 150
f
SW
= 2.1MHz
LOAD TRANSIENT RESPONSE (PWM MODE)
MAX16993 toc21
200µs/div
V
OUT1
I
OUT1
100mV/div
1A/div
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16993 toc20
V
SUP
(V)
SUPPLY CURRENT (µA)
3530252015105
10
20
30
40
50
60
70
0
0 40
T
A
= +125ºC
T
A
= +25ºC
T
A
= -40ºC
V
OUT1
= 5.0V, SKIP MODE
ONLY BUCK CONTROLLER ENABLED
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16993 toc19
V
SUP
(V)
SUPPLY CURRENT (µA)
3530252015105
20
40
60
80
100
120
0
0 40
T
A
= +125ºC
T
A
= +25ºC
T
A
= -40ºC
V
FB
= V
GND
SKIP MODE
ALL THREE BUCKS ENABLED
MEASURED AT VSUP
STARTUP SEQUENCE
(V
EN2
= V
EN3
= V
OUT1
)
MAX16993 toc18
2ms/div
V
EN1
V
OUT1
V
RESET1
V
OUT2
V
RESET2
V
OUT3
V
RESET3
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div