Datasheet

5Maxim Integrated
MAX16909
36V, 220kHz to 1MHz Step-Down Converter
with Low Operating Current
Typical Operating Characteristics
(V
SUP
= V
SUPSW
= V
EN
= 14V, V
OUT
= 1.8V, R1 = 80.6kΩ, R2 = 100kΩ, T
A
= +25NC (Figure 4), unless otherwise noted.)
SWITCHING FREQUENCY vs. I
LOAD
(1.8V/400kHz)
MAX16909 toc06
SWITCHING FREQUENCY (kHz)
391
392
393
394
395
396
397
398
399
400
390
I
LOAD
(A)
2.52.01.51.00.50 3.0
V
IN
= 14V
SWITCHING FREQUENCY vs. R
FOSC
MAX16909 toc05
R
FOSC
(kI)
SWITCHING FREQUENCY (MHz)
1009070 8040 50 6030
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
20 110
V
IN
= 14V
0.010.0010.00010 0.1
EFFICIENCY vs. LOAD CURRENT
V
IN
= 14V
MAX16909 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
10
20
30
40
50
60
70
80
90
100
0
1.8V
3.3V
5V
8V
D1: B360B-13-F, DIODES
L1: DRA125-150-R,
COOPER BUSSMANN
EFFICIENCY vs. LOAD CURRENT
V
IN
= 14V
MAX16909 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
0 0.5 1.51.0 2.52.0 3.0
10
20
30
40
50
60
70
80
90
100
0
DIODE: B360B-13-F FROM DIODES
INDUCTOR: DRA125-150-R,
COOPER BUSSMANN
1.8V
3.3V 5V 8V
MAX16909 toc02
V
IN
V
OUT
V
PGOOD
5V/div
5V/div
1V/div
0V
0V
0V
2ms/div
STARTUP INTO NO LOAD
(1.8V/400kHz)
STARTUP INTO HEAVY LOAD
(1.8V/400kHz)
MAX16909 toc01
V
IN
V
OUT
I
LOAD
V
PGOOD
5V/div
5V/div
1V/div
2A/div
0V
0V
0A
0V
2ms/div
0.6I RESISTIVE LOAD