MAX15046AAEE+ Maxim Integrated Products, MAX15046AAEE+ Datasheet - Page 20

• Manufacturer Part Number: MAX15046AAEE+
• Description: IC BUCK SYNC ADJ 3A 16QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX15046AAEE+

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 34 V
• Current - Output: 3A
• Frequency - Switching: 100kHz ~ 1MHz
• Voltage - Input: 4.5 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Power - Output: 771.5mW
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

40V, High-Performance, Synchronous
Buck Controller
Careful PCB layout is critical to achieve clean and stable
operation. The switching power stage requires particular
attention. Follow these guidelines for good PCB layout:
1) Place decoupling capacitors as close as possible to
2) Connect input and output capacitors to the power
3) Keep the high-current paths as short and wide as
4) Connect CSP to the drain of the low-side FET using a
5) Ensure all feedback connections are short and direct.
6) Route high-speed switching nodes (BST, LX, DH, and
20
the IC. Connect the power ground plane (connected
to PGND) and signal ground plane (connected to
GND) at one point near the device.
ground plane; connect all other capacitors to the sig-
nal ground plane.
possible. Keep the path of switching current (C2 to
IN and C2 to PGND) short. Avoid vias in the switching
paths.
Kelvin connection for accurate current-limit sensing.
Place the feedback resistors as close as possible to the
IC.
DL) away from sensitive analog areas (RT, FB, COMP,
and LIM).
_____________________________________________________________________________________
PCB Layout Guidelines
Typical Application Circuit 1 in the Typical Application
Circuits section shows an application circuit that oper-
ates out of 24V and outputs up to 10A at 3.3V. R5 sets
the switching frequency to 350kHz.
Typical Application Circuit 2 in the Typical Application
Circuits section shows an application circuit for a single
+4.5V to +5.5V power-supply operation.
Typical Application Circuit 3 in the Typical Application
Circuits section shows an application circuit for a +24V
supply to drive the external MOSFETs and an auxiliary
+5V supply to power the device
Single 4.5V to 5.5V Supply Operation
24V Supply, 3.3V Output Operation
Auxiliary 5V Supply Operation