STMICROELECTRONICS STEVAL

STEVAL-ISA050V1
Monolithic VR for chipset and DDR2/3 demonstration board
based on the PM6641
Data Brief
Features
■
■
Switching section
– 0.8 V ±1% voltage reference
– 2.7 V to 5.5 V input voltage range
– Fast response, constant frequency, current
mode control
– Three independent, adjustable, SMPS For
DDR2/3 (VDDQ) and chipset supply
– S3-S5 states compliant DDR2/3 section
– Active soft-end for all outputs
– Selectable tracking discharge for VDDQ
– Separate Power Good signals
– Pulse skipping at light load
– Programmable current limit and soft-start
for all outputs
– Latched OVP, UVP protection
– Thermal protection
STEVAL-ISA050V1
±15 mA low noise buffered reference. Each
regulator is provided of basic under voltage (UV)
and over voltage (OV) protections, programmable
soft-start and current limit, active soft-end and
pulse-skipping at light loads.
Reference and termination voltages (VTTREF
and VTT)
– ±2 Apk LDO for DDR2/3 termination (VTT)
with fold back
– Remote VTT output sensing
– High-Z VTT output in S3
– ±15 mA low noise DDR2/3 buffered
reference (VTTREF)
Application
■
Supply for ultra-mobile PC (UMPC)
Description
The STEVAL-ISA050V1 demonstration board is
based on the PM6641, that is a monolithic voltage
regulator module, with internal Power MOSFET,
specifically designed to supply DDR2/3 memory
and chipset in ultra-mobile PC and real estate
portable systems. It integrates three independent,
adjustable, constant frequency buck converters, a
±2 Apk low drop-out (LDO) linear regulator and a
November 2008
Rev 1
For further information contact your local STMicroelectronics sales office.
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2
3
1
JP4
STRIP 3
1
C1
0603-1u
0603
0603-10
06 -100p
C29
+ C5
EL SMD C-10u
10u
R6
0603-12
060 -120k
R5
0603-15
060 -150k
TP8
GND
TP9
VOUT_1
_1S8
VCC
1
R3
0603
0603-100
100k
C22
0603 330p
0603-330
R11
0603 100k
0603-100
VIN
0603-22n
06 -22n
C19
603-15
15p
0603
C32
C2
08
0805-1
5-10u
1
C15
B Case - 220u
C6
20u
B Case - 220
2
39-1u
2839-
C21
3
1
2
JP6
STRIP 3
C24
060303-330p
30p
C17
C12
805-10
10u
0805
0603 33n
0603-33
C18
R10
060303-180k
80k
U1
6641_Q
1_QFPN
PM66
1
AVCC
TP16
AGND
C11
1206
206-22
22u
36
35
34
33
32
31
30
29
28
27
26
25
C9
B Case - 220u
EN_VTT
EN_1
_1S5
EN_1
_1S05
05
VIN_1
_1S5
VSW_1
VS
_1S5_2
5_2
VSW_1
VS
_1S5_1
5_1
SGND_1
_1S5_
5_2
SGND_1
_1S5_
5_1
VFB_1
_1S5
COMP_1
_1S5
SS_1
_1S5
PG_1
_1S5
L3
2839-1u
283
VOUT_1S05
1
TP12
12
0603-1
03-100p
C31
THERMAL
R9
060303-56k
6k
R2
0603-4
3-4R3
06
0603-1
03-100n
AGND_1
_1
SET_SWF
SE
VOUT_1S8
CSNS
SGND_1S8_1
SGND_1S8_2
VSW_1S8_1
VS
8_1
VSW_1S8_2
VS
8_2
VIN_1S8_1
_1
VIN_1S8_2
_2
VFB_1S8
COMP_1S8
0603
0603-15
15p
C33
49
1
2
3
4
5
6
7
8
9
10
11
12
R33
603-join
0603
1
TP14
14
VTT
1
TP1
VTTREF
1
AVCC
AV
R13
03-68k
0603-
0603-joi
3-join
06
R32
R4
0603 68k
0603-68
JP1
STRIP 3
2
0603
603-22
22n
L1
2
1
STRIP 2
JP8
2
1
1
STRIP 2
JP7
0603-100n
0n
06
AVCC
R1
0603-4
3-4R3
06
C16
1
1
AVCC
AV
1
2
AVCC
AV
C4
08 -10u
0805-10u
VIN
GND
1
TP13
13
R31
0603-joi
03-join
1
2
VCC
GND
TP17
17
10u
EL SMD C-10u
1
2
2839
2839-1u
1u5
VIN
603-100
100p
0603
C25
R34
06
0603-joi
3-join
1
VIN
TP7
TP18
18
AUX
0603-100p
-100p
060
C26
R17
060303-68k
R18
060
0603-68k
-68k
AUX
R22
603-68
68k
0603
AUX
R19
060
0603-68k
-68k
1
2
3
4
TP2
PG_1S8
TP3
PG_1S5
8
7
6
5
TP4
PG_1
_1S05
05
R8
0603-120
120k
0603
R7
0603 100k
0603-100
SW DIP-4
SW1
JP5
STRIP 3
0603-10
06 -100p
C28
R23
603-68
68k
0603
2
+ C8
EL SMD C-10u
10u
0603-100p
0p
06
C27
R21
603-68
68k
0603
AUX
R20
603-68k
8k
0603-
0603
0603-100
100p
C30
C7
B Case - 220u
C3
0805
0805-10
10u
R30
0603-joi
join
0603
C23
060303-470p
70p
L2
C34
0603-1
3-15p
06
1
C20
060 -22n
0603-22n
R12
0603603-47k
7k
JP3
STRIP 3
+ C13
C10
EL SMD C-10
10u
20u
B Case - 220
C14
2
AVCC
3
1
TP15
15
LDOIN
2
1
1
TP6
AGND
3
2
48
47
46
45
44
43
42
41
40
39
38
37
VCC
VTT_FB
DSCG
VTTREF
LDO_IN
VTT
VTT_GND
AVCC
AGND
ND_2
SE
SET_PH1
AGND
ND_3
EN_1S8
SS_1S8
SS_1S05
COMP_1S05
VFB_1
_1S05
SGND
ND_1
_1S05_1
SGND
ND_1
_1S05_2
VSW_1S05_1
5_1
VSW_1S05_2
5_2
VIN_1
_1S05_1
VIN_1
_1S05_2
PG_1
_1S05
PG_1
_1S8
13
14
15
16
17
18
19
20
21
22
23
24
1
2
TP5
VCC
+
1
1
2
3
1
1
1
2/4
TP10
10
VOUT_1S5
TP11
11
GND
1
Figure 1.
1
1
1
Circuit schematic
STEVAL-ISA050V1
Circuit schematic
Schematic
AM03286v1
STEVAL-ISA050V1
2
Revision history
Revision history
Table 1.
Document revision history
Date
Revision
12-Nov-2008
1
Changes
Initial release.
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STEVAL-ISA050V1
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