Datasheet

WPMDB1400362Q / 171040302
MagI
3
C Power Module
VDRM – Variable Step Down Regulator Module
we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0
© May 2016 17/48
BLOCK DIAGRAM
INTSS RT/CLK
FB
PG
VSENSE+
C
IN
C
OUT
VIN
V
OUT
34k
ENABLE
SS/TRK
SW
C
boot
100n
UVLO
VOUT
PGND
CCOMP
PWM Controller/
Driver/
Prote ction Circuitry
BOOT
RC OMP INTRRT
AGND
COMP
7 6 5 4 321
35
36
26
28
29
27
VREF
Error Ampli fier
Power Module
48.7k
0.8V
1430Ω
1µH
R
SET
V
IN
Current
So ur ce
17-25, 39
8-14, 38
33,
34
37
CIRCUIT DESCRIPTION
The MagI³C Power Module series 1710x0302 is based on a synchronous step down regulator with integrated MOSFETs and
a power inductor. The control scheme is based on a Current Mode (CM) regulation loop.
The V
OUT
of the regulator is divided with the feedback resistor network of internal 1430Ω and external R
SET
and fed into the
FB pin. The error amplifier compares this signal with the internal 0.803V reference. The error signal is amplified and controls
the on-time of a fixed frequency pulse width generator. This signal drives the power MOSFETs.
The Current Mode architecture features a constant frequency during load steps. Only the on-time is modulated. It is
internally compensated and stable with low ESR output capacitors and requires no external compensation network.
This architecture supports fast transient response and very small output ripple values (less than 10mV) are achieved.