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参数资料
| 型号： | LM10506TME |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA34 |
| 封装： | 0.40 MM PITCH, MICRO SMD-34 |
| 文件页数： | 18/34页 |
| 文件大小： | 1020K |
| 代理商： | LM10506TME |
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20.0 Device Operating Modes
20.1 STARTUP SEQUENCE
The startup mode of the LM10506 will depend on the input
voltage. Once VIN reaches the UVLO threshold, there is a 15
msec delay before the LM10506 determines how to set up the
buck regulators. If V
IN is below 3.6V, then Buck 1 and Buck 2
will be in bypass mode, see Section 19.2.7 Bypass-FET Op-
eration on Buck 1 and Buck 2 for functionality description. If
the VIN voltage is greater than 3.6V the bucks will start up as
the standard regulators. The 3 buck regulators are staggered
during startup to avoid large inrush currents. There is a fixed
delay of 2 msec between the startup of each regulator.
The Startup Sequence will be:
1.
15 msec (±30%) delay after V
IN above UVLO
2.
LDO
→ 3.2V → 3.2V
3.
2 msec delay
4.
Buck 1
→ 3.0V → 3.0V
5.
2 msec delay
6.
Buck 2
→ 3.0V or if H/L_B2 = Low → 1.8V
(For LM10506-A Buck 2
→ 2.0V or if H/L_B2 = Low →
1.8V)
7.
2 msec delay
8.
Buck 3
→ 1.2V or if H/L_B3 = Low → 1.0V
30166206
FIGURE 6. Operating Modes
20.2 POWER-ON DEFAULT AND DEVICE ENABLE
The device is always enabled and the LDO is always on, un-
less outside of operating voltage range. There is no LM10506
Enable Pin. Once V
IN reaches a minimum required input Volt-
age the power-up sequence will be started automatically and
the startup sequence will be initiated. Once the device is
started, the output voltage of the Bucks 1 and 2 can be indi-
vidually disabled by accessing their corresponding BKEN
register bits (BUCK CONTROL).
20.3 RESET: PIN FUNCTION
The RESET pin is internally pulled high. If the reset pin is
pulled low, the device will perform a complete reset of all the
registers to their default states. This means that all of the volt-
age settings on the regulators will go back to their default
states.
20.4 STANDBY: FUNCTION
The Device can be programmed into Standby mode. There
are 2 ways for doing that:
1.
STANDBY pin
2.
Programming via SPI
20.4.1 STANDBY Pin
When the STANDBY pin is asserted high, the LM10506 will
enter Standby Mode. While in Standby Mode, Buck 1 and
Buck 2 are disabled. Buck 3’s output voltage is transitioned
to the PSML (Programmable Standby Mode Level) as set by
25
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LM10506
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM10506TME/NOPB | 功能描述:直流/直流开关转换器 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM10506TME-A | 制造商:TI 制造商全称:Texas Instruments 功能描述:Triple Buck LDO Power Management Unit |
| LM10506TME-A/NOPB | 功能描述:直流/直流开关转换器 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM10506TMX | 制造商:TI 制造商全称:Texas Instruments 功能描述:Triple Buck LDO Power Management Unit |
| LM10506TMX/NOPB | 功能描述:PMIC 解决方案 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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