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参数资料
| 型号： | TPS62221DDCRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A SWITCHING REGULATOR, 1850 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | GREEN, PLASTIC, TSOT-23, 5 PIN |
| 文件页数： | 4/24页 |
| 文件大小： | 640K |
| 代理商： | TPS62221DDCRG4 |
LOW DROPOUT OPERATION 100% DUTY CYCLE
V min=V max+I maxxr
max+R
I
O
DS(on)
L
()
ENABLE
UNDERVOLTAGE LOCKOUT
SLVS491E – SEPTEMBER 2003 – REVISED FEBRUARY 2009....................................................................................................................................... www.ti.com
The TPS6222x offers a low input to output voltage difference, while still maintaining operation with the 100% duty
cycle mode. In this mode, the P-channel switch is constantly turned on. This is particularly useful in
battery-powered applications to achieve longest operation time by taking full advantage of the whole battery
voltage range. The minimum input voltage to maintain regulation, depending on the load current and output
voltage, can be calculated as:
where:
I
O, max = maximum output current plus indicator ripple current
r
DS(on), max = maximum P-channel switch rDS(on)
R
L = dc resistance of the inductor
V
O, max = normal output voltage plus maximum output voltage tolerance
Pulling the enable low forces the part into shutdown, with a shutdown quiescent current of typically 0.1
A. In this
mode, the P-channel switch and N-channel rectifier are turned off, the internal resistor feedback divider is
disconnected, and the whole device is in shutdown mode. If an output voltage, which could be an external
voltage source or super capacitor, is present during shutdown, the reverse leakage current is specified under
electrical characteristics. For proper operation, the enable pin must be terminated and must not be left floating.
Pulling the enable high starts up the TPS6222x with the soft start as previously described.
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions.
12
Copyright 2003–2009, Texas Instruments Incorporated
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| TPS62221DDCT | 功能描述:直流/直流开关调节器 1.5V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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| TPS62222DDCR | 功能描述:直流/直流开关调节器 1.8V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62222DDCRG4 | 功能描述:直流/直流开关调节器 1.8V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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