MAX1637EEE Maxim Integrated Products, MAX1637EEE Datasheet - Page 19

• Manufacturer Part Number: MAX1637EEE
• Description: IC CTRLR MINI LV STPDWN 16-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1637EEE

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.1 ~ 5.5 V
• Current - Output: 3A
• Frequency - Switching: Adj to 350kHz
• Voltage - Input: 3.15 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Power - Output: 667mW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

sensing at the supply’s output terminals without interfer-
ence from IR drops and ground noise. Other high-cur-
rent paths should also be minimized, but focusing
primarily on short ground and current-sense connec-
tions eliminates about 90% of all PC board layout prob-
lems (see the PC board layouts in the MAX1637
evaluation kit manual for examples).
2) Place the IC and signal components. Keep the main
3) Use a single-point star ground where the input
Figure 7. 3.15V to 5.5V Single-Supply Application Circuit
switching nodes (LX nodes) away from sensitive
analog components (current-sense traces and REF
capacitor). Place the IC and analog components on
the opposite side of the board from the power-
switching node. Important: The IC must be no fur-
ther than 10mm from the current-sense resistors.
Keep the gate-drive traces (DH, DL, and BST) short-
er than 20mm and route them away from CSH, CSL,
and REF. Place ceramic bypass capacitors close to
the IC. The bulk capacitors can be placed further
away.
ground trace, power ground (subground plane), and
normal ground plane meet at the supply's output
ground terminal. Connect both IC ground pins and
all IC bypass capacitors to the normal ground plane.
1μF
1μF
______________________________________________________________________________________
ON/OFF
SYNC
SKIP
REF
SHDN
GND
V
CC
MAX1637
20Ω
CC
470pF
PGND
CSH
CSL
V
BST
DH
DL
FB
GG
LX
Precision Step-Down Controller
CMPSH-3
0.1μF
IRF7401
4.7μF
TANTALUM
V
BIAS
3.15V TO 5.5V
MBRS130
IRF7401
Miniature, Low-Voltage,
CDHR125-100
Figure 8. Kelvin Connections for the Current-Sense Resistors
TRANSISTOR COUNT: 2164
___________________Chip Information
10μH
220μF
OS-CON
20mΩ
1%
MAX1637
HIGH-CURRENT PATH
130k
1%
100k
1%
OUTPUT = 2.5V AT 4A
470μF
LOW ESR
TANTALUM
SENSE RESISTOR
19