PM6652 STMicroelectronics, PM6652 Datasheet - Page 41

• 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

PM6652
8.11
8.11.1
δ
G
V
=
CORE
G
D
,
STAT
⋅
G
SNS
=
System accuracy
VCORE accuracy
Starting from
Equation 23
●
●
●
●
The statistical variation of the output voltage is given by the following equation:
Equation 24
●
●
●
●
Based on
Equation 25
The same mathematical approach provides with the following computation, based on
Equation 11
(
δ
VDAC is the internal reference voltage, i.e. the digital-to-analog converter output
programmed by the 7 VIDs;
G
G
NTC thermal compensation network, typically used in DCR current sensing technique;
R
V
δ
(refer to
δ
used. This two elements are only influenced by external components;
δ
due to its accuracy;
δ
V
G
R
V
DAC
SNS
D
SNS
OFFSET
DAC
SNS
D
is the droop gain, given by Equation 8;
/G
) (
Equation 7
2
is the current sensing filter attenuation. This element is lower than 1 if there is an
is the current sensing element, i.e. the inductor DCR or the precision resistor;
D
is the internal reference voltage error, lower than 0.7% of the programmed VID
+
is the current sensing element (inductor's DCR or precision resistor) variation
:
Figure 5 on page 13
and
Equation 7
G
< 2.5 mV is the PM6652 integrator maximum offset.
⋅
R
δ
SNS
G
V
SNS
CC
the droop gain statistical error is:
⋅
I
_
OUT
/G
SNS
and
SNS
)
2
−
G
δ
Equation 9
G
⋅
Doc ID 16867 Rev 3
G
V
D
⎛
⎜
⎜
⎝
are the statistical error of the droop gain and NTC network, if
D
⎛ δ
⎜ ⎜
⎝
SS
D
=
);
G
=
_
G
1
D
SNS
+
D
G
R
R
⎞
⎟ ⎟
⎠
G
D
2
2
1
D
=
−
, the programmed output voltage is given by:
+
1
V
⎛ δ
⎜
⎜
⎝
DAC
G
⎛ δ
⎜ ⎜
⎝
G
SNS
R
SNS
R
−
2
2
G
⎞
⎟ ⎟
⎠
D
⎞
⎟
⎟
⎠
2
2
⋅
⎞
⎟
⎟
⎠
+
G
+
⎛ δ
⎜ ⎜
⎝
SNS
(
R
G
R
1
⋅
1
⋅
I
(
OUT
⎞
⎟ ⎟
⎠
R
2
SNS
δ ⋅
⋅
R
I
OUT
SNS
)
) (
Device description
2
+
G
D
δ ⋅
V
OFFSET
41/53
)
2