TPS708_TI 具有电源正常指示和独立使能功能的 250mA、双通道低压降稳压器

TPS708的基本参数

制造厂商：TI
产品类别：电源管理
技术类目：线性和低压降 (LDO) 稳压器
功能描述：具有电源正常指示和独立使能功能的 250mA、双通道低压降稳压器
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TPS708的产品详情：

The TPS708xx is a low dropout voltage regulator with integrated SVS (RESET, POR, or power on reset) and power good (PG) functions. These devices are capable of supplying 250 mA and 125 mA by regulator 1 and regulator 2 respectively. Quiescent current is typically 190 µA at full load. Differentiated features, such as accuracy, fast transient response, SVS supervisory circuit (power on reset), manual reset input, and independent enable functions provide a complete system solution.

The TPS708xx family of voltage regulators offers very low dropout voltage and dual outputs. These devices have extremely low noise output performance without using any added filter bypass capacitors and are designed to have a fast transient response and be stable with 10-µF low ESR capacitors.

These devices have fixed 3.3-V/2.5-V, 3.3-V/1.8-V, 3.3-V/1.5-V, 3.3-V/1.2-V, and adjustable voltage options. Regulator 1 can support up to 250 mA, and regulator 2 can support up to 125 mA. Separate voltage inputs allow the designer to configure the source power.

Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low (typically 170 mV on regulator 1) and is directly proportional to the output current. Additionally, since the PMOS pass element is a voltage-driven device, the quiescent current is very low and independent of output loading (maximum of 230 µA over the full range of output current and full range of temperature). This LDO family also features a sleep mode; applying a high signal to EN1 or EN2 (enable) shuts down regulator 1 or regulator 2, respectively. When a high signal is applied to both EN1 and EN2, both regulators enter sleep mode, thereby reducing the input current to 2 µA at T_J = +25°C.

For each regulator, there is an internal discharge transistor to discharge the output capacitor when the regulator is turned off (disabled).

The PG1 pin reports the voltage condition at V_OUT1. The PG1 pin can be used to implement a SVS (RESET, POR, or power on reset) for the circuitry supplied by regulator 1. The PG2 pin reports the voltage conditions at V_OUT2. The PG2 pin can be used to implement a SVS (power on reset) for the circuitry supplied by regulator 2.

The TPS708xx features a RESET (SVS, POR, or power on reset). RESET output initiates a reset in the event of an undervoltage condition. RESET also indicates the status of the manual reset pin (MR). When MR is in the logic high state, RESET goes to a high impedance state after a 120-ms delay. To monitor V_OUT1, the PG1 output pin can be connected to MR. To monitor V_OUT2, the PG2 output pin can be connected to MR.

The device has an undervoltage lockout UVLO circuit that prevents the internal regulators from turning on until V_IN1 reaches 2.5V.

TPS708的优势和特性：

Dual Output Voltages for Split-Supply Applications
Independent Enable Functions (See Part Number TPS707xx for Sequenced Outputs)
Output Current Range of 250 mA on Regulator 1 and 125 mA on Regulator 2
Voltage Options: 3.3-V/2.5-V, 3.3-V/1.8-V, 3.3-V/1.5-V, 3.3-V/1.2-V, and Dual Adjustable Outputs
Open Drain Power-On Reset with 120-ms Delay
Open Drain Power Good for Regulator 1 and Regulator 2
Ultralow 190-μA (typ) Quiescent Current
1-μA Input Current During Standby
Low Noise: 65 μVRMS Without Bypass Capacitor
Quick Output Capacitor Discharge Feature
One Manual Reset Input
2% Accuracy Over Load and Temperature
Undervoltage Lockout (UVLO) Feature
20-Pin PowerPAD? TSSOP Package
Thermal Shutdown Protection

PowerPAD Is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.

TPS708的参数（英文）：

Output options
Adjustable Output, Dual Output, Fixed Output
Iout (Max) (A)
0.25
Vin (Max) (V)
6
Vin (Min) (V)
2.7
Vout (Max) (V)
5.5
Vout (Min) (V)
1.2
Fixed output options (V)
1.2, 1.5, 1.8, 3.3
Noise (uVrms)
65
Iq (Typ) (mA)
0.19
Thermal resistance θJA (°C/W)
32
Rating
Catalog
Load capacitance (Min) (μF)
10
Regulated outputs (#)
2
Features
Enable, Output discharge, Power good
Accuracy (%)
2
PSRR @ 100 KHz (dB)
20
Dropout voltage (Vdo) (Typ) (mV)
83
Operating temperature range (C)
-40 to 125

TPS708具体的完整产品型号参数及价格（美元）：

TPS708的完整型号有：TPS70802PWP、TPS70845PWP、TPS70848PWP、TPS70851PWP、TPS70851PWPR、TPS70858PWP，以下是这些产品的关键参数及官网采购报价：

TPS70802PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS70802PWP的批量USD价格：1.605（1000+）

TPS70845PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS70845PWP的批量USD价格：1.605（1000+）

TPS70848PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS70848PWP的批量USD价格：1.605（1000+）

TPS70851PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS70851PWP的批量USD价格：1.926（1000+）

TPS70851PWPR，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS70851PWPR的批量USD价格：1.605（1000+）

TPS70858PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS70858PWP的批量USD价格：1.605（1000+）

TPS708的评估套件：

TPS708的电路图解：

TPS708的评估套件：