MIC25400YML TR Micrel Inc, MIC25400YML TR Datasheet - Page 21

• Manufacturer Part Number: MIC25400YML TR
• Description: IC REG PWM SYNC BUCK 2A 24MLF
• Manufacturer: Micrel Inc
• Series: -r

Specifications of MIC25400YML TR

• Pwm Type: Voltage Mode
• Number Of Outputs: 2
• Frequency - Max: 1.2MHz
• Duty Cycle: 75%
• Voltage - Supply: 4.5 V ~ 13.2 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 24-VFQFN Exposed Pad, 24-MLF®
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 576-3902-2

RC Snubber
•
Low-side MOSFET
•
•
•
Micrel, Inc.
January 2011
Place the RC snubber on the same side of the board
and as close as possible to the low-side MOSFET.
Low-side drive MOSFET traces (LSD pin-to-
MOSFET gate pin) must be short and routed over a
ground plane. The ground plane should be the
connection between the MOSFET source and
PGND.
Chose a low-side MOSFET with a high CGS/CGD
ratio and a low internal gate resistance to minimize
the effect of dv/dt inducted turn-on.
Do not put a resistor between the LSD output and
21
•
High-side MOSFET
•
the gate.
Use a 4.5V Vgs rated MOSFET. Its higher gate
threshold voltage is more immune to glitches than a
2.5V or 3.3V rated MOSFET. MOSFETs that are
rated for operation at less than 4.5V
used.
Add a 20 ohm resistor in series with the boost pin.
This will slow down the turn-on time of the high-side
MOSFET while leaving the turn-off time unaffected.
M9999-020111-C
GS
should not be
MIC25400