MAX16048ACB+ Maxim Integrated Products, MAX16048ACB+ Datasheet - Page 60

• Manufacturer Part Number: MAX16048ACB+
• Description: IC EE-PROG SYS MGR 8CH 64-TQFP
• Manufacturer: Maxim Integrated Products
• Type: System Managerr

Specifications of MAX16048ACB+

• Number Of Voltages Monitored: 8
• Output: Open Drain, Push-Pull
• Reset: Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Some applications require filtering of the DAC outputs.
This is especially necessary in applications that require
a large distance between the power supplies to be
margined and the MAX16046A/MAX16048A, or those
that require immunity to noise. A simple RC filter may
be inserted (see Figure 16).
The calculations change slightly for this configuration.
For DC margining calculations, R
culate the lowpass cutoff frequency, use the following
formula:
Place resistor R
possible to the feedback node.
To connect the MAX16046A/MAX16048A to a power
supply using the trim input method, see Figure 17.
Calculate the output voltage, V
where V
ply; R
power supply; R
ing the trim input to the DACOUT_ output; and
V
12-Channel/8-Channel EEPROM-Programmable
System Managers with Nonvolatile Fault Registers
Figure 15. Connections for Margining Using Feedback Method
60
DACOUT_
V
OUT
______________________________________________________________________________________
1
, R
REF
=
DC-DC OR LDO
⎛
⎜
⎝
2
is the output voltage of the DACOUT_ output.
1
, R
is the reference voltage of the power sup-
+
V
REF
R
3
R
, and R
5
3A
1
2
is an optional series resistor connect-
⎞
⎟
⎠
⎛
⎜
⎝
and the capacitor, C, as close as
OUT
R V
FB
f
3 DACOUT_
=
4
2 R
are resistors internal to the
π
R
R
Filtering the DAC Outputs
1
2
1
3B
R
OUT
R
3
C
3
3
+
, as follows:
= R
R
+
Trim Input Method
4 4
(R
+
3A
4
R
MAX16046A
MAX16048A
+
+ R
5
R )V
V
5
DACOUT_
3B
. To cal-
REF
⎞
⎟
⎠
Calculate the ratio of R
mula:
Resistors R
may be derived from the formulas given in the DC-DC
converter data sheet where trim input functionality is
discussed. DC-DC module data sheets usually include
trim-up and trim-down formulas in the following form:
where ∆ is the fraction of the total correction.
Another form of trim-up and trim-down formulas may
appear as follows:
Figure 16. DACOUT Filter
TRIM DOWN:R
TRIM UP:R
TRIM DOWN:R
TRIM UP:R
DC-DC OR LDO
ADJ_UP
ADJ_UP
V
3
REF
ADJ_DOWN
ADJ_DOWN
and R
( )
( )
⎛
⎜
⎝
k
k
OUT
Ω
1
−
Ω
FB
⎛
⎜
⎜
⎝
+
=
R
4
=
R
R
3
⎛
⎜
⎜
⎝
( )
⎛
⎜
⎝
( )
and the reference voltage, V
( )
k
V
1
2
k
k
Ω
V
OUT_NO
R
R
1
Ω Ω
Ω
OUT_NOM
1
2
⎞
⎟ =
⎠
R
and R
=
3A
V
×
=
REF
⎛
⎜
⎝
100
R
⎛
⎝ ⎜
V
1
3
M M
OUT_NOM
−
( )
+
∆
k
(
R
2
V
∆
(
Ω
∆
V
R
C
3
−
%
REF
REF
⎞
⎠ ⎟
∆
using the following for-
4
R
( )
1
R
×
%
3B
k
( )
⎞
⎟
⎠ ⎠
k
100
Ω
3
∆
⎛
⎝ ⎜
Ω
( )
%
1
k
×
−
∆
Ω
+
−
(
∆
100
R
(
R
−
⎞
⎠ ⎟
3
4
R
R
( )
k
( )
+
MAX16046A
MAX16048A
3
4
k
Ω ∆
∆
Ω
( )
( )
%
k k
k
)
Ω
Ω
+ +
)
)
%
V
R
⎞
⎟
⎟
⎠
DACOUT_
−
3
⎞
⎟
⎟
⎠
R
( )
k
4
Ω
( )
REF
k
)
Ω
⎞
⎟
⎠
,