Datasheet

MAX17503 4.5V-60V, 2.5A, High-Efciency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
Maxim Integrated │ 5
www.maximintegrated.com
Typical Operating Characteristics
(V
IN
= V
EN/UVLO
= 24V, V
PGND
= V
SGND
= 0V, C
VIN
= C
VCC
= 2.2µF, C
BST
= 0.1µF, C
SS
=5600pF,RT=MODE=open,T
A
= T
J
= -40ºC
to +125ºC, unless otherwise noted. Typical values are at T
A
=+25ºC.AllvoltagesarereferencedtoGND,unlessotherwisenoted.)
5V OUTPUT, PWM MODE, FIGURE 4a
CIRCUIT EFFICIENCY vs. LOAD CURRENT
MAX17503 toc01
EFFICIENCY (%)
200015001000500
50
60
70
80
90
100
40
0 2500
V
IN
= 12V
V
IN
= 48V
MODE = SGND
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (mA)
3.3V OUTPUT, PWM MODE, FIGURE 4b
CIRCUIT EFFICIENCY vs. LOAD CURRENT
MAX17503 toc02
EFFICIENCY (%)
200015001000500
50
60
70
80
90
100
40
0 2500
V
IN
= 12V
V
IN
= 48V
MODE = SGND
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (mA)
5V OUTPUT, PFM MODE, FIGURE 4a
CIRCUIT EFFICIENCY vs. LOAD CURRENT
MAX17503 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
100010010
65
70
75
80
85
90
95
100
60
1 2500
V
IN
= 12V
V
IN
= 48V
V
IN
= 24V
V
IN
= 36V
MODE = OPEN
3.3V OUTPUT, PFM MODE, FIGURE 4b
CIRCUIT EFFICIENCY vs. LOAD CURRENT
MAX17503 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
100010010
60
65
70
75
80
85
90
95
100
50
55
1 2500
V
IN
= 12V
V
IN
= 48V
V
IN
= 24V
V
IN
= 36V
MODE = OPEN
5V OUTPUT, DCM MODE, FIGURE 4a
CIRCUIT EFFICIENCY vs. LOAD CURRENT
MAX17503 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
100010010
30
40
50
60
70
80
90
100
20
1 2500
V
IN
= 12V
V
IN
= 48V
V
IN
= 24V
V
IN
= 36V
MODE = VCC
3.3V OUTPUT, DCM MODE, FIGURE 4b
CIRCUIT EFFICIENCY vs. LOAD CURRENT
MAX17503 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
1000100101 2500
V
IN
= 12V
V
IN
= 48V
V
IN
= 24V
V
IN
= 36V
MODE = VCC
30
40
50
60
70
80
90
100
20
5V OUTPUT, PWM MODE, FIGURE 4a
CIRCUIT LOAD AND LINE REGULATION
MAX17503 toc07
OUTPUT VOLTAGE (V)
4.96
4.97
4.98
4.99
5.00
5.01
5.02
5.03
5.04
5.05
4.95
200015001000500
0 2500
V
IN
= 12V V
IN
= 24V V
IN
= 36V
V
IN
= 48V
LOAD CURRENT (mA)
MODE = SGND
3.3V OUTPUT, PWM MODE, FIGURE 4b
CIRCUIT LOAD AND LINE REGULATION
MAX17503 toc08
OUTPUT VOLTAGE (V)
3.26
3.27
3.28
3.29
3.30
3.31
3.32
3.33
3.34
3.35
3.25
200015001000500
0 2500
V
IN
= 12V V
IN
= 24V V
IN
= 36V
V
IN
= 48V
LOAD CURRENT (mA)
MODE = SGND
5V OUTPUT, PFM MODE, FIGURE 4a
CIRCUIT
LOAD AND LINE REGULATION
MAX17503 toc09
OUTPUT VOLTAGE (V)
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
4.5
V
IN
= 36V
V
IN
= 48V
V
IN
= 12V
200015001000500
0 2500
V
IN
= 24V
LOAD CURRENT (mA)
MODE = OPEN