Datasheet

Typical Operating Characteristics
(V
SUP
= V
EN
= 14V, C
IN
= 10μF, C
OUT
= 94μF, C
BIAS
= 2.2μF, C
BST
= 0.1μF, R
FOSC
= 66.5kΩ, f
OSC
= 468kHz, V
FB
= V
BIAS
,
V
OUT
= 5V, T
A
= +25°C, unless otherwise noted.)
MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
5
Maxim Integrated
V
OUT
= 3.3V STARTUP RESPONSE
(SKIP MODE)
MAX16955 toc01
I
OUT
2A/div
V
OUT
2V/div
5V/div
V
PGOOD
10V/div
2ms
MAX16955 toc02
I
OUT
2A/div
V
OUT
2V/div
5V/div
V
PGOOD
10V/div
2ms
V
OUT
= 5V STARTUP RESPONSE
(SKIP MODE)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16955 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
302412 18
5
10
15
20
30
25
35
40
0
636
FIXED-FREQUENCY MODE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16955 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
30241812
10
20
30
40
50
60
70
80
90
100
0
636
SKIP MODE
EFFICIENCY vs. LOAD CURRENT
MAX16955 toc05
LOAD CURRENT (A)
EFFICIENCY (%)
3.53.02.0 2.51.0 1.50.5
10
20
30
40
50
60
70
80
90
100
0
0 4.0
V
OUT
= 5V
V
OUT
= 3.3V
FIXED-FREQUENCY MODE
EFFICIENCY vs. LOAD CURRENT
MAX16955 toc06
LOAD CURRENT (A)
EFFICIENCY (%)
10.10.010.001
10
20
30
40
50
60
70
80
90
100
0
0.0001 10
SKIP MODE
V
OUT
= 5V
V
OUT
= 3.3V
SWITCHING FREQUENCY vs. R
FOSC
MAX16955 toc07
R
FOSC
(kI)
FREQUENCY (kHz)
135125105 11545 55 65 75 85 9535
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
200
25 145