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| 型号： | TPS793285DBVRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5 |
| 封装： | PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 2/16页 |
| 文件大小： | 356K |
| 代理商： | TPS793285DBVRQ1 |
TPS79301Q1,'79318Q1, '79325Q1
'79328Q1,'793285Q1,'79330Q1
TPS79333Q1,'793475Q1
SGLS162B APRIL 2003 REVISED JUNE 2005
www.ti.com
10
APPLICATION INFORMATION
The TPS793xx family of low-dropout (LDO) regulators has been optimized for use in noise-sensitive battery-operated
equipment. The device features low dropout voltages, high PSRR, ultralow output noise, low quiescent current (170
A
typically), and enable-input to reduce supply currents to less than 1
A when the regulator is turned off.
A typical application circuit is shown in Figure 22.
0.1
F
BYPASS
OUT
1
3
IN
EN
GND
2
4
5
VI
VO
2.2
F
+
TPS793xx
0.01
F
Figure 22. Typical Application Circuit
EXTERNAL CAPACITOR REQUIREMENTS
A 0.1-
F or larger ceramic input bypass capacitor, connected between IN and GND and located close to the TPS793xx,
is required for stability and improves transient response, noise rejection, and ripple rejection. A higher-value electrolytic
input capacitor may be necessary if large, fast-rise time load transients are anticipated and the device is located several
inches from the power source.
Like all low dropout regulators, the TPS793xx requires an output capacitor connected between OUT and GND to stabilize
the internal control loop. The minimum recommended capacitance is 2.2
F. Any 2.2 F or larger ceramic capacitor is
suitable, provided the capacitance does not vary significantly over temperature.
The internal voltage reference is a key source of noise in an LDO regulator. The TPS793xx has a BYPASS pin which is
connected to the voltage reference through a 250-k
internal resistor. The 250-k internal resistor, in conjunction with an
external bypass capacitor connected to the BYPASS pin, creates a low-pass filter to reduce the voltage reference noise
and, therefore, the noise at the regulator output. In order for the regulator to operate properly, the current flow out of the
BYPASS pin must be at a minimum, because any leakage current will create an IR drop across the internal resistor thus
creating an output error. Therefore, the bypass capacitor must have minimal leakage current.
For example, the TPS79328 exhibits only 32
VRMS of output voltage noise using a 0.1-F ceramic bypass capacitor and
a 2.2-
F ceramic output capacitor. Note that the output starts up slower as the bypass capacitance increases due to the
RC time constant at the BYPASS pin that is created by the internal 250-k
resistor and external capacitor.
BOARD LAYOUT RECOMMENDATION TO IMPROVE PSRR AND NOISE PERFORMANCE
To improve ac measurements like PSRR, output noise, and transient response, it is recommended that the board be
designed with separate ground planes for VIN and VOUT, with each ground plane connected only at the GND pin of the
device. In addition, the ground connection for the bypass capacitor should connect directly to the GND pin of the device.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS793285DBVT | 功能描述:低压差稳压器 - LDO High PSRR Fast RF High-Enable 200mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS793285DBVTG4 | 功能描述:低压差稳压器 - LDO High PSRR Fast RF High-Enable 200mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS793285QDBVRQ1 | 功能描述:低压差稳压器 - LDO Ultra Lo Noise Hi PSRR Fast RF 200mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS793285QDBVRSV | 制造商:Texas Instruments 功能描述: |
| TPS793285YEQEVM | 功能描述:电源管理IC开发工具 TPS793285YEQ Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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