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參數(shù)資料
| 型號： | PM6670ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.4 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFN-24 |
| 文件頁數(shù)： | 24/55頁 |
| 文件大?。?/td> | 849K |
| 代理商： | PM6670ATR |
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Device description
PM6670
30/53
VDDQ output voltage can be set in the range from 0.9V to 2.6V. Adjustable mode
automatically switches DDRSEL pin to become the power saving algorithm selector: if tied
to +5V, the forced-PWM (fixed frequency) control is performed. If grounded or connected to
VREF pin (1.237V reference voltage), the Pulse-Skip or Non-Audible Pulse-Skip Modes are
respectively selected.
7.1.5
Current sensing and current limit
The PM6670 switching controller uses a valley current sensing algorithm to properly handle
the current limit protection and the inductor current zero-crossing information. The current is
sensed during the conduction time of the low-side MOSFET. The current sensing element is
the on-resistance of the low-side switch. The sensing scheme is visible in Figure 36.
Figure 36. Current sensing scheme
An internal 100
A current source is connected to C
SNS pin that is also the non-inverting
input of the positive current limit comparator. When the voltage drop developed across the
sensing parameter equals the voltage drop across the programming resistor RILIM, the
controller skips subsequent cycles until the overcurrent condition is detected or the output
UV protection latches off the device (see Section 7.1.11: Over Voltage and Under Voltage
).
Table 8. Mode-Of-Operation settings summary
Mode
DDRSEL
VDDQ
Operating mode
VMODE > 4.3V
VDDRSEL > 4.2V
1.8V
Pulse-Skip
1V < VDDRSEL < 3.5V
1.5V
<0.5V
VMODE < 3.7V
VDDRSEL > 4.2V
ADJ
Forced-PWM
1V < VDDRSEL < 3.5V
Non-Audible Pulse-skip
VDDRSEL < 0.5V
Pulse-Skip
HGATE
PHASE
CSNS
LGATE
PGND
PM6670
100A
R
ILIM
V
IN
V
OUT
I
VALLEYRDSon
HGATE
PHASE
CSNS
LGATE
PGND
PM6670
100A
R
ILIM
V
IN
V
OUT
I
VALLEYRDSon
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| PM6670S | 功能描述:DC/DC 開關控制器 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/直流開關調節(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 |
| PM6675 | 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:LDO CNTRLR STDN 0.6V TO 3.3V/1.5V 24PIN VFQFPN - Rail/Tube |
| PM6675AS | 功能描述:DC/DC 開關控制器 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 |
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