PM6641 STMicroelectronics, PM6641 Datasheet - Page 6

• Manufacturer Part Number: PM6641
• Description: IC MONO VR DDR2/3 PC VFQFPN-48
• Manufacturer: STMicroelectronics

Specifications of PM6641

• Applications: Converter, DDR2, DDR3
• Voltage - Input: 2.7 ~ 5.5 V
• Number Of Outputs: 3
• Voltage - Output: 0.8 ~ 5.5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN
• Output Voltage: 0.9 V
• Output Current: 3 A
• Input Voltage: 2.7 V to 5.5 V
• Switching Frequency: 1000 KHz
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• For Use With: 497-8425 - KIT EVAL PM6641 CHIPSET/DDR2/3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pin settings
2.2
6/47
Pin description
Table 2.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
n°
1
2
3
4
5
6
7
8
9
COMP_1S05
SGND_1S05
SGND_1S05
COMP_1S8
SGND_1S8
SGND_1S8
VSW_1S05
VSW_1S05
VOUT_1S8
VFB_1S05
SET_SWF
VSW_1S8
VSW_1S8
VIN_1S05
VIN_1S05
PG_1S05
VFB_1S8
SS_1S05
VIN_1S8
VIN_1S8
PG_1S8
PG_1S5
SS_1S8
AGND
CSNS
Pin
Pin functions
Analog and signal ground.
Switching frequency setting input.
See
VDDQ/2 divider input and discharge path for 1.8 V rail.
Current limit setting input for all rails.
See
Switcher power ground for 1.8 V rail.
Switcher power ground for 1.8 V rail.
Switch node for 1.8 V rail.
Switch node for 1.8 V rail.
Power supply input for 1.8 V rail.
Power supply input for 1.8 V rail.
Feedback input for 1.8 V rail.
See
Loop compensation output for 1.8 V rail. See
control loop on page 24
components selection on page 38
Positive terminal of the external soft-start capacitor for 1.8 V rail.
See
Positive terminal of the external soft-start capacitor for 1.05 V rail.
See
Loop compensation output for 1.05 V rail. See
control loop on page 24
components selection on page 38
Feedback input for 1.05 V rail.
See
Switcher power ground for 1.05 V rail.
Switcher power ground for 1.05 V rail.
Switch node for 1.05 V rail.
Switch node for 1.05 V rail.
Power supply input for 1.05 V rail.
Power supply input for 1.05 V rail.
Power Good signal for 1.05 V rail. Open drain. See
supply on page 22
Power Good signal for 1.8 V rail. Open drain. See
switching regulator on page 20
Power Good signal for 1.5 V rail. Open drain. See
supply on page 22
Chapter 7.8: Switching frequency selection on page 29
Chapter 7.10: Peak current limit on page 31
Chapter 7.5: Output voltage divider on page 27
Chapter 7.6: Outputs soft-start on page 28
Chapter 7.6: Outputs soft-start on page 28
Chapter 7.5: Output voltage divider on page 27
Doc ID 13510 Rev 3
section for details.
section for details.
and
and
Chapter 8.4: SW regulator compensation
Chapter 8.4: SW regulator compensation
section for details.
Function
sections for details.
for details.
Chapter 7.3: SW regulators
Chapter 7.3: SW regulators
section for details.
section for details.
Chapter 7.1.1: VDDQ
Chapter 7.2: Chipset
Chapter 7.2: Chipset
section for details
PM6641