L6712Q STMicroelectronics, L6712Q Datasheet - Page 10
L6712Q
Manufacturer Part Number
L6712Q
Description
IC CTRLR DC/DC 2PHASE 36-VFQFPN
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet
1.L6712AQTR.pdf
(29 pages)
Specifications of L6712Q
Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
0.9 ~ 3.3 V
Current - Output
2A
Frequency - Switching
150kHz
Voltage - Input
12V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
36-VFQFN, 36-VFQFPN
Power - Output
3.5W
Operating Temperature Range
- 40 C to + 125 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-5365-5
L6712Q
L6712Q
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L6712A L6712
Figure 6. Reference Management
The output regulated voltage accuracy can be extracted from the following relationships (worst case con-
dition):
where V
tively and K
tion (see relevant section).
A statistical analysis could consider applying the root-sum-square (RSS) method to calculate the precision
since all the variables are statistically independent as follow:
10/29
V
OUT_TOT_ACC
V
OUT_TOT_ACC
OS_RA
REF_IN/OUT
V
OS
OUT_TOT_ACC
[%] =
VID3
VID2
VID1
and V
= 1+1/RA_Gain reflects the impact of the Remote Amplifier Gain (RA_Gain) on the regula-
=
[ ]
%
EXT_REF_Accuracy[%]
(
OS_EA
=
EXT_REF_Accuracy[%]
EXT_REF_Accuracy[%]
V
[ ]
OUT_TOT_ACC
%
REFERENCE
are the offsets related to the Error Amplifier and the Remote Amplifier respec-
BAND-GAP
(1.235V)
=
DAC
V
OUT_ACC
(worst case with external reference)
(worst case with internal reference)
[%]
(with external reference)
(with internal reference)
[ ]
=
%
+
± (
)
2
(
+
SOFT-START
+
2.0%
V
+
CONTROL
K
⎛
⎝
OUT_ACC
DIGITAL
------------------------------------ - [%]
REF_IN/OUT
------------------------------------ - [%]
REF_IN/OUT
LOGIC
OS
)
V
V
⋅
+
V
-------------------- 100
PROG
PROG
V
⎛
⎝
OS_RA
-------------------------- - 100
EXT_REF
OUT
± (
[%]
5mV
)
2
⋅
+
)
⎛
⎝
K
⎞
⎠
VIDx
+
⋅
OS
2
=
⎛
⎝
+
-------------------------- - 100
EXT_REF
⎛
⎝
V
± (
⋅
V
-------------------------- - 100
EXT_REF
PROG
⎞
⎠
V
-------------------- 100
OS_EA
V
0.9%
V
+
OS_RA
OS_EA
OUT
K
OS
)
+
⋅
⋅
⋅
± (
-------------------- - 100
K
⋅
OS
INTERNAL REFERENCE
EXTERNAL REFERENCE
V
8mV
FB
out
⎞
⎠
⎞
⎠
AMPLIFIER
⋅
2
⎞
⎠
+
± (
-------------------- - 100
2
ERROR
K
)
V
+ K
8mV
⋅
OS
OUT
⎛
⎝
OS
⋅
V
-------------------- 100=
)
V
⋅
OS_RA
⋅
OUT
V
-------------------- 100
COMP
V
OS_RA
OUT
⋅
⋅
⎞
⎠
2