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PM6641TR Datasheet(PDF) 32 Page - STMicroelectronics

Part # PM6641TR
Description  Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6641TR Datasheet(HTML) 32 Page - STMicroelectronics

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Device description
PM6641
32/47
where VREF = 0.9V is the constant voltage forced by CSNS pin, RCSNS [Ω] is the resistor
connected between CSNS and AGND,
α is the coefficient that collects the MOS current
sensing scaling factor and other design parameters and ICL is the peak current limit [A].
The following table resumes values for all the switching regulators.
The following graph is a plot of the switching regulators peak current limit, increasing the
RCSNS resistor:
Figure 33. SW regulators peak current limit
From the previous plot and table it’s clear that the three regulators peak current limits are
scaled; by changing the RCSNS external resistor the three peak current limits all change.
Table 11. Typical SW regulators values
SW regulator
α
1.8V
333x10e3
1.5V
222x10e3
1.05V
278x10e3
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
40
60
80
100
120
140
160
180
Rcsns [kOhm]
CL_1V8
CL_1V5
CL_1V05
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
40
60
80
100
120
140
160
180
Rcsns [kOhm]
CL_1V8
CL_1V5
CL_1V05



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