PM6652 STMicroelectronics, PM6652 Datasheet - Page 42

• Manufacturer Part Number: PM6652
• Description: IC CTLR STEPDOWN SMPS 32VFQFPN
• Manufacturer: STMicroelectronics

Specifications of PM6652

• Applications: Controller, Intel IMVP-6.5™, VR11
• Voltage - Input: 4.5 V ~ 36 V
• Number Of Outputs: 1
• Voltage - Output: 0.3 V ~ 1.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Device description
8.11.2
42/53
δ
V
IMON
V
IMON
,
STAT
Equation 26
As explained in
properly designed, can impact the overall accuracy. In this case
updated:
Equation 27
given
leakage current (
Equation 27
element is almost negligible if the NTC thermal compensation network is used.
Current reporting (IMON) accuracy
The current monitor feature (IMON), as described in
on page 35
Equation 28
●
●
●
●
The statistical error of the IMON function can be computed:
Equation 29
δ
δ
δ
V
δ
The IMON accuracy can be influenced by a not properly designed current sensing filter (as
explained in
thermal drift, as summarized in
R
R
G
G
IMON,OFF
SNS
IMON
INT
SNS
=
G
R
G
R
δ
/G
IMON
SNS
INT
SNS
⎛ δ
⎜
⎜
⎝
/R
/G
V
/R
R
INT
LKG
R
SNS
SNS
RSNS
IMON
= 3 is the internal fixed gain;
SNS
is the current sensing element.
< 1 mV is the IMON maximum input offset;
is the current sensing filter attenuation;
, has the following design equation:
and RG are external resistors for gain programming;
< 1% is the internal fixed gain error;
Section 8.7: Current sensing on page 31
takes also account of the sensing element variation due to thermal drift: this
the voltage drop across the current sensing filter resistor, due to the CSNS pin
is the current sensing element accuracy;
is the current sensing filter error (refer to
⎞
⎟
⎟
⎠
δ
G
and
2
G
Section 8.7: Current sensing on page 31
SNS
Equation 13
+
SNS
⎛ δ
⎜
⎜
⎝
δ
R
R
R
RG
=
δ
G
G
V
(
/R
1
CORE
⎞
⎟
⎟
⎠
−
2
G
V
G
+
IMON
are the external resistors accuracy;
).
SNS
⎛ δ
⎜
⎜
⎝
=
Doc ID 16867 Rev 3
R
R
Equation 30
δ
IMON
)
=
V
IMON
⋅
CORE
G
⎛ δ
⎜ ⎜
⎝
INT
R
⎞
⎟
⎟
⎠
R
2
,
STAT
⋅
A
A
R
+
⎞
⎟ ⎟
⎠
R
IMON
⎛ δ
⎜ ⎜
⎝
2
G
:
G
+
+
G
INT
⎛ δ
⎜
⎜
⎝
δ
INT
⋅
V
G
R
R
LKG
⎞
⎟ ⎟
⎠
NTC
SNS
NTC
2
Section 8.10.2: Current monitor (IMON)
+
+
) and by the current sensing element
⋅
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
R
Equation 26
G
G
2
SNS
+
the current sensing filter, if not
SNS
⋅
I
⎛ δ
⎜
⎜
⎝
OUT
V
⋅
R
I
⋅
R
IMON
OUT
R
S
δ ⋅
S
SNS
Equation 22
⎞
⎟
⎟
⎠
R
,
2
off
TH
+
for details).
⋅
I
OUT
⎛ δ
⎜ ⎜
⎝
R
R
P
⎞
⎟
⎟
⎠
P
2
⎞
⎟ ⎟
⎠
+
2
must be
⎛ δ
⎜
⎜
⎝
G
G
SNS
SNS
PM6652
⎞
⎟
⎟
⎠
2