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| 型号： | PM6670STR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件页数： | 29/54页 |
| 文件大小： | 742K |
| 代理商： | PM6670STR |
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PM6670S
Device description
Doc ID 14432 Rev 4
35/54
7.1.9
Gate drivers
The integrated high-current gate drivers allow using different power MOSFETs. The high-
side driver uses a bootstrap circuit which is supplied by the +5 V rail. The BOOT and
PHASE pins work respectively as supply and return path for the high-side driver, while the
low-side driver is directly fed through VCC and PGND pins.
An important feature of the PM6670S gate drivers is the adaptive anti-cross-conduction
circuitry, which prevents high-side and low-side MOSFETs from being turned on at the same
time. When the high-side MOSFET is turned off, the voltage at the PHASE node begins to
fall. The low-side MOSFET is turned on only when the voltage at the PHASE node reaches
an internal threshold (2.5 V typ.). Similarly, when the low-side MOSFET is turned off, the
high-side one remains off until the LGATE pin voltage is above 1V.
The power dissipation of the drivers is a function of the total gate charge of the external
power MOSFETs and the switching frequency, as shown in the following equation:
Equation 23
The low-side driver has been designed to have a low-resistance pull-down transistor
(0.6
Ω typ.) in order to prevent undesired ignition of the low-side MOSFET due to the Miller
effect.
7.1.10
Reference voltage and bandgap
The 1.237 V internal bandgap reference has a granted accuracy of ±1 % over the
0 °C to 85 °C temperature range. The VREF pin is a buffered replica of the bandgap voltage.
It can supply up to ±100
μA and is suitable to set the intermediate level of MODE, DDRSEL
and DSCG multifunction pins. A 100 nF (min.) bypass capacitor toward SGND is required to
enhance noise rejection. If VREF falls below 0.8 V (typ.), the system detects a fault condition
and all the circuitry is turned OFF.
An internal divider derives a 0.9 V ± 1 % voltage (Vr) from the bandgap. This voltage is used
as a reference by the switching regulator output. The over-voltage protection, the under-
voltage protection and the power good signal are also referred to Vr.
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| PM6675ASTR | 功能描述:低压差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
| PM6675ATR | 功能描述:低压差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
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