SMM605 SUMMIT Microelectronics, Inc:, SMM605 Datasheet - Page 13

• Manufacturer Part Number: SMM605
• Description: Six-channel Supply Voltage Marginer And Active Dc Output Controller
• Manufacturer: SUMMIT Microelectronics, Inc:

Figure 8 – SMM605 Applications schematic for an adjustable switching regulator (Full regulator circuit not
shown).
Summit Microelectronics, Inc
APPLICATIONS INFORMATION (CONTINUED)
DIODE
D1
SMX3200 I2C Programming
Connector 10 pin Header
R1 and R2 need only be
placed once on the I2C bus
0.01uF
C6
1
3
5
7
9
READY
START
Gnd
Gnd3
Rsrv5
+10V
+5V
R1 10K
R2 10K
+12VIN(+6V to 14V)
R5 10K
R4 10K
Rsrv10
Rsrv8
SDA
SCL
MR
J1
2
4
6
8
10
0.1uF
C4
4
7
2
1
3
START
READY
SCL
SDA
A2
U1
0.01uF
C5
SMM605
The SMM605 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
TRIM_CAPX
FILT_CAP
C1 should be as close
to the SMM105 as
possible
TRIMX
C3
0.1uF
VMX
2064 1.2 09/20/06
15
C1 1uF
R3 RTRIM
0.02uF
C2
START
For Example, If Vout=3.3V, R4=63.4K
15% of Vout=0.5V
ITRIM=8uA
RTRIM=62.5K so Rtrim should be
next value down from 62.5K
VTRIMlow=0.3V, VOSENSE=0.8V
The current through R3 is
ITRIM=(0.8-0.3)/RTRIM
(ITRIM)(R4) > 15% of VOUT
RTRIMmax should be no greater
then the calculated value
U2
LT3707 Switching Regulator
+Vin
PGOOD
VOSENSE
+Vout
Preliminary Information
SMM605
R5
20k
R4
RSET1
VOUT
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