參數(shù)資料
型號： PM6670AS
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 3 A SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, LEAD FREE, VFQFPN-24
文件頁數(shù)： 30/53頁
文件大小： 745K
代理商： PM6670AS
Device description
PM6670AS
36/53
Doc ID 14436 Rev 2
7.2
VTTREF buffered reference and VTT LDO section
The PM6670AS provides the required DDR2/3 reference voltage on the VTTREF pin. The
internal buffer tracks half the voltage on the VSNS pin and has a sink and source capability
up to 15 mA.
Higher currents rapidly deteriorate the output accuracy. A 10 nF to 100 nF (33 nF typ.)
bypass capacitor to SGND is required for stability.
The VTT low-drop-out linear regulator has been designed to sink and source up to 2 A peak
current and 1 A continuously. The VTT voltage tracks VTTREF within ±35 mV.
A remote voltage sensing pin (VTTSNS) is provided to recovery voltage drops due to
parasitic resistance. In DDR2/3 applications, the linear regulator input LDOIN is typically
connected to VDDQ output; connecting LDOIN pin to a lower voltage, if available in the
system, reduces the power dissipation of the LDO.
A minimum output capacitance of 20
μF (2x10 μF MLCC capacitors) is enough to assure
stability and fast load transient response.
7.2.1
VTT and VTTREF soft-start
Soft-start on VTT and VTTREF outputs is achieved by current clamping.
The LDO linear regulator is provided with a current foldback protection: when the output
voltage exits the internal ±10% VTT-Good window, the output current is clamped at ±1 A.
Re-entering VTT-Good window releases the current limit clamping.
The foldback mechanism naturally implements a two steps soft-start charging the output
capacitors with a 1 A constant current.
Something similar occurs at VTTREF pin, where the output capacitor is smoothly charged at
a fixed 40 mA current limit.
7.2.2
VTTREF and VTT outputs discharge
The tracking discharge mechanism involves the VTT linear regulator. When the suspend-to-
disk state is entered, the switching regulator is turned OFF.
At the same time the LDO drains a 1A constant current from LDOIN and keeps VTT in track
with VTTREF that, in turn, is half the voltage at the VSNS pin. When the VDDQ output
reaches 400mV, the PM6670AS switches on the internal discharge MOSFETs to complete
In Soft Discharge (i.e. non-tracking discharge) the PM6670AS disables the internal
regulators and suddenly turns on the discharge MOSFETs on each output.
相關(guān)PDF資料
PDF描述
PM6670A 1.4 A SWITCHING CONTROLLER, QCC24
PM6670STR 3 A SWITCHING CONTROLLER, QCC24
PM6670S 3 A SWITCHING CONTROLLER, QCC24
PM6670TR 1.4 A SWITCHING CONTROLLER, QCC24
PM6670ATR 1.4 A SWITCHING CONTROLLER, QCC24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6670ASTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670ATR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670S 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
PM6670STR 功能描述:DC/DC 開關(guān)控制器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
PM6670TR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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