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부품번호 | PM6641 기능 |
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기능 | Monolithic VR for chipset and DDR2/3 supply | ||
제조업체 | STMicroelectronics | ||
로고 | |||
전체 30 페이지수
PM6641
Monolithic VR for chipset and DDR2/3 supply
for ultra-mobile PC (UMPC) applications
Features
■ 0.8 V ±1 % internal voltage reference
www.DataSheet4U■.com2.7 V to 5.5 V input voltage range
■ Fast response, constant frequency,
current mode control
■ Three independent, adjustable, out-of-phase
SMPS for DDR2/3 (VDDQ) and chipset supply
■ Low noise DDR2/3 reference (VTTREF)
■ ±2 Apk LDO for DDR2/3 termination (VTT)
with foldback
■ S0-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
Applications
■ DDR2/3 memory and chipset supply
■ UMPC and portable equipment
■ Handheld and PDAs
VFQFPN-48 7x7
Description
The PM6641 is a monolithic voltage regulator
module specifically designed to supply DDR2/3
memory and chipset in ultra-mobile PC and real
estate constrained portable systems.
It integrates three independent, adjustable,
constant frequency buck converters, a ±2 Apk
Low Drop-Out (LDO) linear regulator and a
±15 mA low noise buffered reference.
Each regulator provides basic UV and OV
Protections, programmable Soft-Start and Current
Limit and active Soft-End.
Pulse-Skipping technique is performed to
increase efficiency at very light load.
Table 1. Device summary
Part number
PM6641
PM6641TR
January 2008
Package
VFQFPN-48 7x7 (exposed pad)
VFQFPN-48 7x7 (exposed pad
Rev 2
Packaging
Tray
Tape & reel
1/47
www.st.com
47
Typical application circuit
1 Typical application circuit
Figure 1. Application circuit
www.DataSheet4U.com
VTTREF
SET_SWF
EN_VTT (S3)
VTTFB
VTT
VTTGND
AVCC
VCC
LDOIN
PM6641
4/47
4페이지 PM6641
Pin settings
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Table 2. Pin functions (continued)
N° Pin
Function
26
SS_1S5
Positive terminal of the external Soft-Start Capacitor for 1.5 V rail.
See Chapter 7.6: Outputs Soft-Start on page 28 section for details.
Loop Compensation Output for 1.5 V rail. Chapter 7.3: SW regulators
27 COMP_1S5 control loop on page 24 and Chapter 8.4: SW regulator compensation
components selection on page 38 sections for details.
28
VFB_1S5
Feedback Input for 1.5 V rail.
See Chapter 7.5: Output voltage divider on page 27 section for details
29 SGND_1S5 Switcher power ground for 1.5 V rail.
30 SGND_1S5 Switcher power ground for 1.5 V rail.
31 VSW_1S5 Switch node for 1.5 V rail.
32 VSW_1S5 Switch node for 1.5 V rail.
33 VIN_1S5 Power supply input for 1.5 V rail.
34 EN_1S05 Enable input for 1.05 V rail.
35 EN_1S5 Enable input for 1.5 V rail.
36
EN_VTT
Enable Input for VTT rail. High in S0 System States. See Chapter 7.1.4: S3
and S5 power management pins on page 22 section for details.
Enable Input for 1.8 V (VDDQ) rail. High in S0-S3 System States.
37 EN_1S8 See Chapter 7.1.4: S3 and S5 power management pins on page 22 section
for details.
38
AGND
Analog and Signal Ground.
39
SET_PH1
Switching Regulator Phase Control.
See Chapter 7.9: Phase management on page 30 section for details.
40
AGND
Analog and Signal Ground.
41
AVCC
Analog Circuitry Supply. Connect to +5 V by a simple RC filter.
42 VTTGND LDO Linear Regulator Power Ground.
LDO Linear Regulator Output. DDR2-3 Termination Voltage. See
43 VTT Chapter 7.1: Memory supply on page 20 and Chapter 7.1.2: VTT LDO and
VTTREF buffered reference on page 21 sections for details.
44 LDOIN LDO Linear Regulator Input. Typically connected to the 1.8 V rail.
Reference Voltage Buffer Output. See Chapter 7.1: Memory supply on
45 VTTREF page 20 and Chapter 7.1.2: VTT LDO and VTTREF buffered reference on
page 21 sections for details.
46
DSCG
Tracking/Non-tracking Discharge Selection for DDR2-3 Section. See
Chapter 7.7: Outputs Soft-End on page 29 section for details.
47 VTTFB Feedback Input for VTT Linear Regulator Output.
48
VCC
+5 V Switching Circuitry Supply. Bypass to AGND by a 100 nF capacitor.
7/47
7페이지 | |||
구 성 | 총 30 페이지수 | ||
다운로드 | [ PM6641.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
PM6641 | Monolithic VR for chipset and DDR2/3 supply | STMicroelectronics |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |