Power Deration (multilayer board) ...........................34.5 mW/°C
Operating Temperature Range ......................... -40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering, 10s) ................................. +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics
(Note 1)
Junction-to-Ambient Thermal Resistance (θ
JA
) ..............29°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ..................1.7°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V
IN
= 24V, RT = open, C
VCCINT
= 4.7µF, EN_ = open, DH_, DL_ = open, T
J
= -40°C to +125°C, unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 2)
PARAMETER
INPUT SUPPLY
Input Voltage Range
V
IN
4.5
V
CCINT
= V
IN
SKIP = open, LX_ = PGND, BST_ = 5V
EN1 = open, EN2 = GND, V
FB1
= 0.84V or
EN2 = open, EN1 = GND, V
FB2
= 0.84V
Operating Supply Current
(Note 3)
SKIP = open, LX_ = PGND, BST_ = 5V
EN1 = EN2 = open, V
FB1
= V
FB1
= 0.84V
SKIP = V
CCINT
, LX_ = PGND, BST_ = 5V
EN1 = open, EN2 = GND, V
FB1
= 0.76V or
EN2 = open, EN1 = GND, V
FB2
= 0.76V
SKIP = V
CCINT
, LX_ = PGND,BST_=5V
EN1 = EN2 = open, V
FB1
= V
FB1
= 0.76V
Shutdown Supply Current
EN1 = EN2 = GND
4.5
0.5
1.5
42
5.5
2.0
mA
1
2.5
3.5
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IIN
1
1.5
1.8
3.2
10
3.5
mA
5
20
µA
www.maximintegrated.com
Maxim Integrated
│
3
MAX17548
42V, Dual-Output, Synchronous
Step-Down Controller
Electrical Characteristics (continued)
(V
IN
= 24V, RT = open, C
VCCINT
= 4.7µF, EN_ = open, DH_, DL_ = open, T
J
= -40°C to +125°C, unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 2)
PARAMETER
V
CCINT
REGULATOR
6V < V
IN
< 42V, I
VCCINT
= 1mA
V
CCINT
Output Voltage
V
CCINT
6V < V
CCEXT
< 24V, I
VCCINT
= 1mA
(V
CCINT
supplied from V
CCEXT
)
V
IN
= 12V, I = 0mA to 100mA, V
CCEXT
=
0V (V
CCINT
supplied from V
IN
)
V
VCCEXT
= 12V, I
VCCINT
= 0mA to 100mA
(V
CCINT
supplied from V
CCEXT
)
V
IN
= 8.5V, V
CCEXT
= 0V, V
CCINT
= 4V
V
CCEXT
= 8.5V, V
CCINT
= 4V
(V
CCINT
supplied from V
CCEXT
)
V
IN
= 4.5V, load = 75mA, V
CCEXT
= 0
V
CCINT
supplied from V
CCEXT
, V
IN
= 24V,
V
CCEXT
= 4.7V, load = 75mA
V
CCEXT
rising
4.95
4.95
5
5
120
120
50
50
4.55
0.2
V
CCINT
rising
V
CCINT
falling
RT = 62kΩ
Switching Frequency
RT Pullup Current
Switching Frequency
Adjustable Range
SKIP
DCM Mode Setting Range
PWM Mode Setting Range
SKIP Pulldown Resistance
1.25
V
CCINT
- 1.5
SYMBOL
CONDITIONS
MIN
TYP
5.1
5.1
25
25
250
250
150
150
4.7
0.25
4.2
3.7
440
535
350
10
MAX
5.25
5.25
50
UNITS
V
V
CCINT
Load Regulation
mV
50
340
340
420
420
4.85
0.3
4.4
3.9
475
590
375
10.5
2200
µA
kHz
kHz
mV
V
V
V
mA
V
CCINT
Short-Circuit Output
Current
V
CCINT
Dropout Voltage
V
CCEXT
Switch Overvoltage
V
CCEXT
Switch Overvoltage
Hysteresis
V
CCINT
UVLO
OSCILLATOR
4
3.5
405
480
325
9.5
100
f
SW
RT = V
CCINT
RT = GND
V
RT
= 0.5V
f
SW
26.5kΩ < RT < 280kΩ
V
CCINT
-1.6
V
V
kΩ
V
CCINT
100
130
70
www.maximintegrated.com
Maxim Integrated
│
4
MAX17548
42V, Dual-Output, Synchronous
Step-Down Controller
Electrical Characteristics (continued)
(V
IN
= 24V, RT = open, C
VCCINT
= 4.7µF, EN_ = open, DH_, DL_ = open, T
J
= -40°C to +125°C, unless otherwise noted. Typical values
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