Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°C
Absolute Maximum Ratings (Note 1)
V
IN
to PGND
.........................................................-0.3V to +65V
EN/UVLO to SGND
...............................................-0.3V to +65V
LX to PGND................................................-0.3V
to (V
IN
+ 0.3V)
BST to PGND
........................................................-0.3V to +70V
BST to LX .............................................................-0.3V to +6.5V
BST to V
CC
...........................................................-0.3V to +65V
FB, CF,
RESET,
SS, MODE, SYNC,
RT to SGND
.....................................................-0.3V to +6.5V
V
CC
to SGND
.......................................................-0.3V to +6.5V
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 Information
PACKAGE TYPE:
20 TQFN
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
30°C/W
2°C/W
T2055+4
21-0140
90-0009
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
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.
Note 1:
Junction temperature greater than +125°C degrades operating lifetimes.
Electrical Characteristics
(V
IN
= V
EN/UVLO
= 24V, R
RT
= 40.2kI (500kHz), C
VCC
= 2.2µF, V
PGND
= V
SGND
= V
MODE
= V
SYNC
= 0V, LX = SS =
RESET
=
open, V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are
referenced to SGND, unless otherwise noted.) (Note 2)
PARAMETER
INPUT SUPPLY (V
IN
)
Input Voltage Range
Input Shutdown Current
V
IN
I
IN-SH
I
Q_PFM
Input Quiescent Current
I
Q_DCM
I
Q_PWM
V
EN/UVLO
= 0V (shutdown mode)
V
FB
= 1V, MODE =
RT= open
V
FB
= 1V, MODE = open
DCM mode, V
LX
= 0.1V
Normal switching mode, f
SW
= 500kHz,
V
FB
= 0.8V
4.5
2.8
118
162
1.16
9.5
1.8
mA
60
4.5
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
2
MAX17504
4.5V–60V,
3.5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
Electrical Characteristics (continued)
(V
IN
= V
EN/UVLO
= 24V, R
RT
= 40.2kI (500kHz), C
VCC
= 2.2µF, V
PGND
= V
SGND
= V
MODE
= V
SYNC
= 0V, LX = SS =
RESET
=
open, V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are
referenced to SGND, unless otherwise noted.) (Note 2)
PARAMETER
ENABLE/UVLO (EN/UVLO)
EN/UVLO Threshold
EN/UVLO Input Leakage Current
LDO
V
CC
Output Voltage Range
V
CC
Current Limit
V
CC
Dropout
V
CC
UVLO
POWER MOSFET AND BST DRIVER
High-Side nMOS On-Resistance
Low-Side nMOS On-Resistance
LX Leakage Current
SOFT-START (SS)
Charging Current
FEEDBACK (FB)
FB Regulation Voltage
FB Input Bias Current
MODE
V
M-DCM
MODE Threshold
V
M-PFM
V
M-PWM
CURRENT LIMIT
Peak Current-Limit Threshold
Runaway Current-Limit Threshold
Valley Current-Limit Threshold
PFM Current-Limit Threshold
I
PEAK-LIMIT
I
RUNAWAY-LIMIT
I
SINK-LIMIT
I
PFM
MODE = open or MODE = V
CC
MODE = GND
MODE = open
0.6
4.4
4.9
-0.16
5.1
5.7
0
-1.8
0.75
0.9
5.85
6.7
+0.16
A
A
A
A
MODE = V
CC
(DCM mode)
MODE = open (PFM mode)
MODE = GND (PWM mode)
V
CC
-
1.6
V
CC
/2
1.4
V
FB_REG
I
FB
MODE = SGND or MODE = V
CC
MODE = open
0 < V
FB
< 1V, T
A
= +25ºC
0.89
0.89
-50
0.9
0.915
0.91
0.936
+50
V
nA
I
SS
V
SS
= 0.5V
4.7
5
5.3
µA
R
DS-ONH
R
DS-ONL
I
LX_LKG
I
LX
= 0.3A
I
LX
= 0.3A
V
LX
= V
IN
- 1V, V
LX
= V
PGND
+ 1V,
T
A
= +25ºC
-2
165
80
325
150
+2
mΩ
mΩ
µA
V
CC
I
VCC-MAX
V
CC-DO
V
CC_UVR
V
CC_UVF
6V < V
IN
< 60V, I
VCC
= 1mA
1mA ≤ I
VCC
≤ 25mA
V
CC
= 4.3V, V
IN
= 6V
V
IN
= 4.5V, I
VCC
= 20mA
V
CC
rising
V
CC
falling
4.75
26.5
4.2
4.05
3.65
4.2
3.8
4.3
3.9
5
54
5.25
100
V
mA
V
V
V
ENR
V
ENF
I
EN
V
EN/UVLO
rising
V
EN/UVLO
falling
V
EN/UVLO
= 0V, T
A
= +25ºC
1.19
1.068
-50
1.215
1.09
0
1.24
1.111
+50
V
nA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
www.maximintegrated.com
Maxim Integrated
│
3
MAX17504
4.5V–60V,
3.5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
Electrical Characteristics (continued)
(V
IN
= V
EN/UVLO
= 24V, R
RT
= 40.2kI (500kHz), C
VCC
= 2.2µF, V
PGND
= V
SGND
= V
MODE
= V
SYNC
= 0V, LX = SS =
RESET
=
open, V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are
referenced to SGND, unless otherwise noted.) (Note 2)
PARAMETER
RT AND SYNC
R
RT
= 210kΩ
R
RT
= 102kΩ
Switching Frequency
f
SW
R
RT
= 40.2kΩ
R
RT
= 8.06kΩ
R
RT
= OPEN
SYNC Frequency Capture Range
SYNC Pulse Width
SYNC Threshold
V
FB
Undervoltage Trip Level to
Cause Hiccup
HICCUP Timeout
Minimum On-Time
Minimum Off-Time
LX Dead Time
RESET
RESET
Output Level Low
RESET
Output Leakage Current
V
OUT
Threshold for
RESET
Assertion
V
OUT
Threshold for
RESET
Deassertion
RESET
Deassertion Delay After FB
Reaches 95% Regulation
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Note 2:
All limits are 100% tested at +25°C. Limits over temperature are guaranteed by design.
Note 3:
See the
Overcurrent Protection/HICCUP Mode
section for more details.
Temperature rising
165
10
ºC
ºC
V
FB-OKF
V
FB-OKR
I
RESET
= 1mA
T
A
= T
J
= +25ºC, V
RESET
= 5.5V
V
FB
falling
V
FB
rising
-0.1
90.5
93.8
92
95
1024
t
ON-MIN
t
OFF-MIN
V
IH
V
IL
V
FB-HICF
(Note 3)
MAX17504
MAX17504S
140
5
0.4
+0.1
94
97.2
55
0.56
0.58
32768
135
80
160
f
SW
set bt R
RT
90
180
475
1950
460
1.1 x
f
SW
50
2.1
0.8
0.6
100
200
500
2200
500
110
220
525
2450
540
1.4 x
f
SW
kHz
ns
V
V
Cycles
ns
ns
ns
ns
V
µA
%
%
Cycles
kHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
4
MAX17504
4.5V–60V,
3.5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
Typical Operating Characteristics
(V
IN
= V
EN/UVLO
= 24V, V
PGND
= V
SGND
= 0V, C
VIN
= 2 x 2.2µF, C
VCC
= 2.2µF, C
BST
= 0.1µF, C
SS
= 12,000pF, RT = MODE = open, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are referenced to SGND, unless otherwise noted.)
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