MAX8513EEI+ Maxim Integrated Products, MAX8513EEI+ Datasheet - Page 33

• Manufacturer Part Number: MAX8513EEI+
• Description: IC SUPPLY TRPL W/MON 28QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX8513EEI+

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 3
• Voltage - Output: 1.25 ~ 5.5 V
• Current - Output: 40mA
• Frequency - Switching: 300kHz ~ 1.4MHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-QSOP
• Power - Output: 860mW
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Careful PC board layout is critical to achieve low
switching losses and clean, stable operation. The
switching power stage requires particular attention.
Follow these guidelines for good PC board layout:
Place decoupling capacitors as close to the IC pins as
possible. Keep separate the power-ground plane (con-
nect to the sources of the low-side MOSFET, PGND,
and the output capacitor’s return). Connect the input
decoupling capacitors across the drain of the high-side
MOSFETs and the source of the low-side MOSFETs.
The signal-ground plane (connected to GND) is con-
nected to the rest of the circuit-ground return. The two
ground planes then connect together with a single con-
Figure 7. Base-Drive Noise Reduction
Wide-Input, High-Frequency, Triple-Output Supplies
Applications Information
______________________________________________________________________________________
PC Board Layout Guidelines
with Voltage Monitor and Power-On Reset
a) POSITIVE OUTPUT VOLTAGE
b) NEGATIVE OUTPUT VOLTAGE
MAX8513
MAX8514
DRV3P
SUP3N
DRV3N
FB3P
FB3N
C BE
CBE
R13
R14
R14
R13
R12
R12
nection at the IC. Keep the high-current paths as short
as possible. Connect the drains of the MOSFETS to a
large copper area to help in cooling the devices, further
improving efficiency and long-term reliability.
1) Ensure all feedback connections are short and
2) Route high-speed switching nodes away from sen-
3) Ensure the current-sense paths for CSP and CSN
4) A reference PC board layout included in the
V
OUT1
direct. Place the feedback resistors as close to the
IC as possible.
sitive analog areas (FB_, COMP, ILIM).
run parallel and close together to cancel any noise
pickup.
MAX8513 evaluation kit is also provided to further
aid layout.
C8
Q4
Q4
V
OUT1
C7
C7
V
OUT3P
C8
L1B
L1B
V
OUT3N
V
OUT1
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