TPS703_TI 具有电源正常指示和使能功能的 1A 双通道超低压降稳压器

TPS703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使能功能的 1A 双通道超低压降稳压器
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TPS703的产品详情：

The TPS703xx family of devices is designed to provide a complete power management solution for TI DSP, processor power, ASIC, FPGA, and digital applications where dual output voltage regulators are required. Easy programmability of the sequencing function makes this family ideal for any TI DSP application with power sequencing requirements. Differentiated features, such as accuracy, fast transient response, SVS supervisory circuit (power-on reset), manual reset inputs, and enable function, provide a complete system solution.

The TPS703xx family of voltage regulators offers very low dropout voltage and dual outputs with power up sequence control, designed primarily for DSP applications. These devices have low noise output performance without using any added filter bypass capacitors, and are designed to have a fast transient response and be stable with 47 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 1 A, and regulator 2 can support up to 2 A. Separate voltage inputs allow the designer to configure the source power.

Because the PMOS pass element behaves as a low-value resistor, the dropout voltage is very low (typically 160mV 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 250 µA over the full range of output current). This LDO family also features a sleep mode; applying a high signal to EN (enable) shuts down both regulators, reducing the input current to 1 µA at T_J = +25°C.

The device is enabled when the EN pin is connected to a low-level input voltage. The output voltages of the two regulators are sensed at the V_SENSE1 and V_SENSE2 pins respectively.

The input signal at the SEQ pin controls the power-up sequence of the two regulators. When the device is enabled and the SEQ terminal is pulled high or left open, V_OUT2 turns on first and V_OUT1 remains off until V_OUT2 reaches approximately 83% of its regulated output voltage. At that time V_OUT1 is turned on. If V_OUT2 is pulled below 83% (that is, in an overload condition) of its regulated voltage, V_OUT1 is turned off. Pulling the SEQ terminal low reverses the power-up order and V_OUT1 is turned on first. The SEQ pin is connected to an internal pull-up current source.

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 an SVS (POR, or power-on reset) for the circuitry supplied by regulator 1.

The TPS703xx features a RESET (SVS, POR, or power-on reset). RESET is an active low, open drain output and requires a pull-up resistor for normal operation. When pulled up, RESET goes to a high impedance state (that is, logic high) after a 120 ms delay when all three of the following conditions are met. First, V_IN1 must be above the undervoltage condition. Second, the manual reset (MR) pin must be in a high impedance state. Third, V_OUT2 must be above approximately 95% of its regulated voltage. To monitor V_OUT1, the PG1 output pin can be connected to MR1 or MR2. RESET can be used to drive power-on reset or a low-battery indicator. If RESET is not used, it can be left floating.

Internal bias voltages are powered by V_IN1 and require 2.7V for full functionality. Each regulator input has an undervoltage lockout circuit that prevents each output from turning on until the respective input reaches 2.5 V.

TPS703的优势和特性：

Dual Output Voltages for Split-Supply Applications
Independent Enable Functions (See Part Number TPS704xx for Independent Enabling of Each Output)
Output Current Range of 1 A on Regulator 1 and 2A on Regulator 2
Fast Transient Response
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
Ultralow 185 μA (typ) Quiescent Current
2 μA Input Current During Standby
Low Noise: 78 μVRMS Without Bypass Capacitor
Quick Output Capacitor Discharge Feature
Two Manual Reset Inputs
2% Accuracy Over Load and Temperature
Undervoltage Lockout (UVLO) Feature
24-Pin PowerPAD? TSSOP Package
Thermal Shutdown Protection

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

TPS703的参数（英文）：

Output options
Adjustable Output, Dual Output, Fixed Output
Iout (Max) (A)
1
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, 2.5, 3.3
Noise (uVrms)
78
Iq (Typ) (mA)
0.185
Thermal resistance θJA (°C/W)
32
Rating
Catalog
Load capacitance (Min) (μF)
22
Regulated outputs (#)
2
Features
Enable, Output discharge, Power good, Sequencing and monitoring
Accuracy (%)
2
PSRR @ 100 KHz (dB)
22
Dropout voltage (Vdo) (Typ) (mV)
160
Operating temperature range (C)
-40 to 125

TPS703具体的完整产品型号参数及价格（美元）：

TPS703的完整型号有：TPS70302PWP、TPS70302PWPR、TPS70345PWP、TPS70345PWPR、TPS70348PWP、TPS70348PWPR、TPS70351PWP、TPS70351PWPR、TPS70358PWP、TPS70358PWPR，以下是这些产品的关键参数及官网采购报价：

TPS70302PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，包装数量MPQ：60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TPS70302PWP的批量USD价格：3.102（1000+）

TPS70302PWPR，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，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TPS70302PWPR的批量USD价格：2.585（1000+）

TPS70345PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，包装数量MPQ：60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TPS70345PWP的批量USD价格：3.102（1000+）

TPS70345PWPR，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，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TPS70345PWPR的批量USD价格：2.585（1000+）

TPS70348PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，包装数量MPQ：60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TPS70348PWP的批量USD价格：3.102（1000+）

TPS70348PWPR，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，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TPS70348PWPR的批量USD价格：2.585（1000+）

TPS70351PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，包装数量MPQ：60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TPS70351PWP的批量USD价格：3.102（1000+）

TPS70351PWPR，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，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TPS70351PWPR的批量USD价格：2.585（1000+）

TPS70358PWP，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，包装数量MPQ：60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TPS70358PWP的批量USD价格：3.102（1000+）

TPS70358PWPR，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，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TPS70358PWPR的批量USD价格：2.585（1000+）

TPS703的评估套件：

TPS703的电路图解：

TPS703的评估套件：