PM6652 STMicroelectronics, PM6652 Datasheet - Page 37

• 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
8.10.3
Equation 18
given δ V
leakage current (see
to temperature increase.
If the current monitoring function is not required, IMONFB should be connected to SVCC
and IMON can be left floating.
C
ripple due to inductor current ripple.
Equation 19
A typical value for CFILT is 47 nF or bigger (IMVP6.5 specifications suggest
C
The IMON voltage is limited to 1.15 V (maximum value), as required by IMVP6.5
specifications, in order to avoid any damage to the CPU. This feature is performed by
limiting the current injected by the PM6652 IMON pin into RIMON resistor.
Figure 39. Current monitor with external components
Thermal throttling
The voltage regulator thermal throttling function is used by the CPU in order to avoid
catastrophic thermal damage.
VRTT# open-drain output pin is forced down when the THERM voltage is lower than an
internal threshold (1.0 V typ. and 200 mV hysteresis). An external NTC resistor, placed near
FILT
FILT
*R
(
Figure 39
IMON
LKG
>=300 µs).
the voltage drop across the current sensing filter resistor, due to the CSNS pin
) can be required by the CPU/GPU in order to filter the current monitor
δ
I
Equation 13
I
AVCL
AVCL
=
δ
Doc ID 16867 Rev 3
I
AVCL
I
AVCL
) and δ R
,
C
WC
FILT
+
⎛
⎜
⎜
⎝
⋅
TH
R
G
IMON
/R
SNS
SNS
⋅
≥
R
V
the current sensing element variation due
LKG
SNS
R
DCR
L
⋅
I
AVCL
⎞
⎟
⎟
⎠
+
⎛ δ
⎜
⎜
⎝
R
R
SNS
TH
⎞
⎟
⎟
⎠
Device description
37/53