EV9943-Q-00A
High-Efficiency, 3A Peak, 36V, 410kHz
Step-Down Converter with Power Good
Evaluation Board
EV9943-Q-00A Rev.1.0 www.MonolithicPower.com 1
9/17/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV9943-Q-00A demonstrates MPS’s
MP9943, a high-frequency, synchronous,
rectified, step-down converter with built-in high-
side and low-side power MOSFETs. The
MP9943 offers a very compact solution to
achieve a 3A peak output current with excellent
load and line regulation over a wide input
supply range. The MP9943 has synchronous
mode operation for higher efficiency over the
output current load range.
Current-mode operation provides fast transient
response and eases loop stabilization.
Full protection features includes over-current
protection and thermal shutdown.
The MP9943 requires a minimal number of
readily-available s is available in a space-
saving QFN8 (3mm x 3mm) package.
ELECTRICAL SPECIFICATION
(1)
Parameter Symbol Value
Continuous 12V TypicalInput
Voltage
Transient
V
IN
36V Max
Output Voltage V
OUT
5V
Output Current I
OUT
3A Peak
Notes:
1) For different Input/output voltage specs and different output
capacitor/inductor may need change the application circuit
parameters.
FEATURES
• Wide 4V to 30V Continuous Operating Input
Range
• 36V Input Transient Tolerance
• 85m/55m Low R
DS(ON)
Internal Power
MOSFETs
• High-Efficiency Synchronous Mode
Operation
• 410kHz Switching Frequency
• Synchronizes from 200kHz-to-2.2MHz
External Clock
• High Duty Cycle for Automotive Cold-crank
• Internal Power-Save Mode
• Internal Soft-Start
• Power Good Indicator
• Over Current Protection and Hiccup
• Thermal Shutdown
• Output Adjustable from 0.8V
• Available in an QFN8 (3mm x 3mm)
Package
APPLICATIONS
• General Consumer
• Multi-Function Printers (MFP)
• Distributed Power Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
EV9943-Q-00A EVALUATION BOARD
Board Number MPS IC Number
EV9943-Q-00A MP9943GQ