SMM605_11 Datasheet, PDF (12/24 Pages) Summit Microelectronics, Inc. – Six-Channel Supply Voltage Marginer and Active DC Output Controller (ADOCTM)

APPLICATIONS INFORMATION (CONTINUED)
SMM605
Preliminary Information
VDD (+2.7V to +5.5V)
+12VIN (+6V to +14V)
The SMM605 and the DC-DC Converter
Can Operate with either 12V or VDD
If 12V is used, VDD can be left floating
If VDD is used, 12V can be left floating
Supply J2
START
READY
D1
DIODE
0.1uF
C1
C3
0.01uF
C2
0.1uF
R4 10K
R3 10K
R2 10K
R1 10K
SMX3200 I2C
Programming
Connector 10
pin Header
1
2
3
5
7
9
Gnd
Gnd3
Rsrv5
+10V
SCL
SDA
MR
Rsrv8
4
6
8
10
+5V Rsrv10
J1
C4
0.1uF
C7
0.01uF
C8 If the SMM605 internal VREF
0.1uF _{is used, the VREF_CNTL pin}
becomes an output
J1
Ext VRef
C6
0.1uF
U4 _LM4121
Vdd
5
4
VOut VIn
1 _Ref
EN ³
U1
C6 1uF
4
7
START
READY
TRIM_CAPX
TRIMX
VMX
2
1
SCL
SDA
SMM605
FILT_CAP ¹⁵
3
A2
C5
0.02uF
U2
DC-DC Converter
7
8
11
9
+Vin
+Vin
Enable
+Vin
+Vout
+Vout
+Vout
1
2
4
3
Sense
Trim ¹⁰
DC-DC ENABLE
VOUT
Figure 7 – SMM605 Applications schematic. The accuracy of the external (U4) or internal reference sets the
accuracy of the ADOC function. Total accuracy with a ±0.1% external reference is ±0.2% and ±0.5% with the
internal reference. The 12V supply can go as low as 6V if the internal regulator is set to 3.6V.
Summit Microelectronics, Inc
2064 2.1 12/16/2011
12