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SMM205NR21 Datasheet(PDF) 11 Page - Summit Microelectronics, Inc.

No. de pieza SMM205NR21
Descripción Electrónicos  Dual Channel Supply Voltage Marginer and Active DC Output Controller
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Fabricante Electrónico  SUMMIT [Summit Microelectronics, Inc.]
Página de inicio  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMM205NR21 Datasheet(HTML) 11 Page - Summit Microelectronics, Inc.

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SMM205
Preliminary Information
Summit Microelectronics, Inc
2069 1.4 6/23/03
11
For Example:
If Vout=3.3V, R4=63.4K, 15% of Vout=0.5V
ITRIM=8uA, RTRIM=62.5K
Therefore Rtrim standard 1% value down
from 62.5K
C8
0.1uF
U3
SMM205
1
2
3
4
5
6
8
10
11
12
14
15
16
17
18
19
20
28
SCL
A2
START
A1
READY
A0
WP#
FILT_CAP
FAULT#
COMP2
VMA
TRIM_CAPB
TRIMB
VMB
TRIM_CAPA
COMP1
TRIMA
SDA
+12VIN (+10V to +15V)
START
R6 10K
C5
0.02uF
J1
1
2
3
4
5
6
7
8
9
10
Gnd
SCL
Gnd3
SDA
Rsrv5
MR
+10V
Rsrv8
+5V
Rsrv10
D1
DIODE
FAULT#
C4
0.1uF
R2 10K
START
R7 10K
READY
The SMM205 START pin must be inactive during power-up so
that the TRIM pin is high impedence. Once power is nominal,
the START pin can be active to start margin and ADOC
functions
C1 1uF
U2
Switching Regulator
+Vout
+Vin
VADJ (VREF)
PGOOD
R5
20k
RTRIM(R3) is calculated as follows:
VTRIMlow=0.3V, Regulator VREF=0.8V
The current through R3 is ITRIM=(0.8-0.3)/RTRIM
(ITRIM)(R4) > 15% of VOUT
RTRIMmax should be < the calculated value
R4
RSET1
C7
0.01uF
R3
RTRIM
R1 10K
R8 10K
SMX3200 I2C Programming
Connector 10 pin Header
R1 and R2 need only be
placed once on the I2C bus
VOUT
Figure 7 – SMM205 Applications schematic for an adjustable switching regulator (Full regulator circuit not
shown).
APPLICATIONS INFORMATION (CONTINUED)


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