Datasheet

MAX16977
36V, 2A, 2.2MHz Step-Down Converter
with Low Operating Current
5Maxim Integrated
Typical Operating Characteristics
(V
SUP
= V
SUPSW
= 14V, V
EN
= 14V, V
OUT
= 5V, V
FSYNC
= 0V, R
FOSC
= 12.1kHz, T
A
= +25NC, unless otherwise noted.)
SWITCHING FREQUENCY vs. LOAD CURRENT
(5V/2.2MHz)
MAX16977 toc07
I
LOAD
(A)
SWITCHING FREQUENCY (MHz)
1.51.00.5
0.5
1.0
1.5
2.0
2.5
3.0
0
0 2.0
V
IN
= 14V
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 14V)
MAX16977 toc05
I
LOAD
(A)
EFFICIENCY (%)
1.81.61.2 1.40.6 0.8 1.00.4
55
60
65
70
75
80
85
90
95
100
50
0.2 2.0
f
SW
= 2.2MHz
L1 = 2.2µH (WURTH 744311220)
D1: D360B-13-F FROM DIODES, INC.
8V
5V
3.3V
FULL-LOAD STARTUP BEHAVIOR
MAX16977 toc01
2ms/div
5V/div
5V/div
V
IN
V
OUT
I
LOAD
V
PGOOD
0V
0A
2V/div
1A/div
0V
0V
5V/2.2MHz
RESISTIVE LOAD = 2.5Ω
0.010.0010.00010 0.1
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 14V)
MAX16977 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
10
20
30
40
50
60
70
80
90
100
0
8V
3.3V
5V
D1: B360B-13-F FROM DIODES, INC.
L1: WURTH 744311220
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(5V/2.2MHz)
MAX16977 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
33.530.023.0 26.512.5 16.0 19.59.0
10
20
30
40
50
60
70
80
90
100
110
120
0
5.5
I
SUP
+ I
SUPSW
NO-LOAD STARTUP BEHAVIOR
(5V/2.2MHz)
MAX16977 toc02
V
IN
V
OUT
V
PGOOD
5V/div
10V/div
2V/div
0V
0V
0V
2ms/div
SUP SHORTED TO SUPSW
SWITCHING FREQUENCY vs. R
FOSC
MAX16977 toc06
R
FOSC
(kI)
SWITCHING FREQUENCY (MHz)
211815
0.5
1.0
1.5
2.0
2.5
3.0
0
12 24
V
IN
= 14V
I
LOAD
= 1.5A