Operating Temperature Range (Note1) ...............-40°C to 125°C
Junction Temperature ....................................... -40°C to +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°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 Information
PACKAGE TYPE: 20-Pin
TQFN
Package Code
Outline Number
Land Pattern Number
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
T2044+4C
21-100172
90-0409
26°C/W
2°C/W
THERMAL RESISTANCE, FOUR-LAYER BOARD
(Note 2)
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.
Note 1:
Junction temperature greater than +125°C degrades operating lifetimes.
Note 2:
Package thermal resistances were obtained using the MAX17633 Evaluation Kit with no airflow.
www.maximintegrated.com
Maxim Integrated
│
3
MAX17633
4.5V to 36V, 3.5A, High Efficiency,
Synchronous Step-Down, DC-DC Converter
Electrical Characteristics
(V
IN
= V
EN/UVLO
= 24V, R
RT
= unconnected (f
SW
= 500 kHz), C
INTVCC
= 2.2μF, V
SGND
= V
PGND
= V
MODE/SYNC
= V
EXTVCC
= 0V;
V
FB
= 3.67V (MAX17633A), V
FB
= 5.5V (MAX17633B), V
FB
= 1V (MAX17633C), LX = SS =
RESET
= OPEN, V
BST
to V
LX
= 5V,
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 3)
PARAMETER
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
EN/UVLO
EN Threshold
EN Input-Leakage Current
INTVCC
INTVCC Output-Voltage
Range
INTVCC Current Limit
INTVCC Dropout
INTVCC Undervoltage
Lockout
EXTVCC
EXTVCC Switchover
Threshold
POWER MOSFET
High-Side nMOS
On-Resistance
Low-Side nMOS
On-Resistance
LX Leakage Current
R
DS_ONH
R
DS_ONL
I
LX_LKG
I
LX
= 0.3A, sourcing
I
LX
= 0.3A, sinking
V
LX
= (V
PGND
+ 1)V to (V
IN
- 1)V,
T
A
= +25°C
-2
65
40
125
80
3
mΩ
mΩ
μA
V
EXTVCC
rising
V
EXTVCC
falling
4.56
4.3
4.7
4.43
4.84
4.6
V
V
INTVCC
I
INTVCC_MAX
V
INTCC_DO
V
INTVCC_UVR
V
INTVCC_UVF
1mA ≤ I
INTVCC
≤ 25mA
6V ≤ V
IN
≤ 36V, I
INTVCC
= 1mA
V
INTCC
= 4.5V, V
IN
= 7.5V
V
IN
= 4.5V, I
INTVCC
= 10mA
V
INTVCC
rising
V
INTVCC
falling
4.05
3.65
4.2
3.8
4.75
4.75
30
0.3
4.3
3.9
5
5
5.25
5.25
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
1.26
1.131
+50
V
nA
V
EN/UVLO
= 0V (shutdown mode)
MODE/SYNC = open, V
EXTVCC
= 5V
R
RT
= 40.2kΩ, MODE/SYNC = open,
V
EXTVCC
= 5V
DCM Mode, V
LX
= 0.1V
Normal switching mode; V
EXTVCC
= 5V
4.5
2.8
96
106
1.2
11
1.8
μA
36
4.5
V
μA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
mA
www.maximintegrated.com
Maxim Integrated
│
4
MAX17633
4.5V to 36V, 3.5A, High Efficiency,
Synchronous Step-Down, DC-DC Converter
Electrical Characteristics (continued)
(V
IN
= V
EN/UVLO
= 24V, R
RT
= unconnected (f
SW
= 500 kHz), C
INTVCC
= 2.2μF, V
SGND
= V
PGND
= V
MODE/SYNC
= V
EXTVCC
= 0V;
V
FB
= 3.67V (MAX17633A), V
FB
= 5.5V (MAX17633B), V
FB
= 1V (MAX17633C), LX = SS =
RESET
= OPEN, V
BST
to V
LX
= 5V,
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
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