MP2106DQ MPS [Monolithic Power Systems], MP2106DQ Datasheet - Page 3

• Manufacturer Part Number: MP2106DQ
• Description: 1.5A, 15V, 800KHz Synchronous Buck Converter
• Manufacturer: MPS [Monolithic Power Systems]

ELECTRICAL CHARACTERISTICS
V
PIN FUNCTIONS
MP2106 Rev. 1.6
2/22/2006
Parameter
Error Amplifier
Voltage Gain
Transconductance
COMP Maximum Output Current
FB Regulation Voltage
FB Input Bias Current
Soft-Start
Soft-Start Current
Output Switch On-Resistance
Switch On Resistance
Synchronous Rectifier On Resistance
Switch Current Limit (Source)
Synchronous Rectifier Current Limit
(Sink)
Thermal Shutdown
Pin #
IN
10
1
2
3
4
5
6
7
8
9
= 5.0V, T
COMP
PGND
SGND Signal Ground.
Name Description
VREF
RUN
BST
VIN
SS
FB
LX
A
TM
= +25°C, unless otherwise noted.
Soft-Start Input. Place a capacitor from SS to SGND to set the soft-start period. The MP2106
sources 2µA from SS to the soft-start capacitor at startup. As the SS voltage rises, the
feedback threshold voltage increases to limit inrush current during startup.
Feedback Input. FB is the inverting input of the internal error amplifier. Connect a resistive
voltage divider from the output voltage to FB to set the output voltage value.
Compensation Node. COMP is the output of the error amplifier. Connect a series RC network
to compensate the regulation control loop.
Internal 2.4V Regulator Bypass. Connect a 10nF capacitor between VREF and SGND to
bypass the internal regulator. Do not apply any load to VREF.
On/Off Control Input. Drive RUN high to turn on the MP2106; low to turn it off. For automatic
startup, connect RUN to VIN via a pullup resistor.
Power Switch Boost. BST powers the gate of the high-side N-Channel power MOSFET switch.
Connect a 10nF or greater capacitor between BST and LX.
Internal Power Input. VIN supplies the power to the MP2106 through the internal LDO
regulator. Bypass VIN to PGND with a 10µF or greater capacitor. Connect VIN to the input
source voltage.
Output Switching Node. LX is the source of the high-side N-Channel switch and the drain of the
low-side N-Channel switch. Connect the output LC filter between LX and the output.
Power Ground. PGND is the source of the N-Channel MOSFET synchronous rectifier. Connect
PGND to SGND as close to the MP2106 as possible.
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
MP2106 – 1.5A, 15V, 800KHz SYNCHRONOUS BUCK CONVERTER
Symbol Condition
A
G
V
I
© 2006 MPS. All Rights Reserved.
I
VEA
FB
SS
FB
EA
www.MonolithicPower.com
V
V
V
V
V
FB
IN
IN
IN
IN
(continued)
= 5V
= 3V
= 5V
= 3V
= 0.895V
Min
875
–100
Typ
400
300
±30
895
255
315
210
255
350
160
2.5
2
Max
915
Units
µA/V
V/V
mV
mΩ
mΩ
mΩ
mΩ
mA
µA
nA
µA
°C
A
3