The LP3985 is designed for portable and wireless applications with demanding performance and space requirements. LP3985 performance is optimized for battery-powered systems to deliver ultra-low noise, extremely low dropout voltage, and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging battery life.
The LP3985 is stable with a small 1 - μF ±30% ceramic or high-quality tantalum output capacitor. The DS-BGA requires the smallest possible PC board area - the total application circuit area can be less than 2 mm x 2.5 mm, a fraction of a 1206 case size.
An optional external bypass capacitor reduces the output noise without slowing down the load transient response. Fast startup time is achieved by utilizing an internal power-on circuit that actively pre-charges the bypass capacitor. Power supply rejection is better than 50 dB at low frequencies and starts to roll off at 1 kHz. High power supply rejection is maintained down to low input voltage levels common to battery-operated circuits.
The device is ideal for mobile phones and similar battery-powered wireless applications. It provides up to 150 mA, from a 2.5 - V to 6 - V input. The LP3985 consumes less than 1.5 μA in disable mode and has a fast turn-on time of less than 200 μs. The LP3985 is available with fixed output voltages from 2.5 V to 5 V. Contact Texas Instruments Sales for specific voltage options.
Texas Instruments LP3985IM5X-4.7/NOPB's Features
- Input Voltage: 2.5 V to 6 V
- 100-mV Maximum Dropout with 150-mA Load
- 150-mA Verified Output
- 50-dB PSRR at 1 kHz at VIN = VOUT + 0.2 V
- ≤ 1.5-µA Quiescent Current when Shut Down
- Fast Turn-On time: 200 µs (typ.)
- 30-µVRMS Output Noise (typical) over 10 Hz to 100 kHz
- −40°C to 125°C Junction Temperature Range for Operation
- 2.5-V, 2.6-V, 2.7-V, 2.8-V, 2.85-V, 2.9-V, 3-V, 3.1- V, 3.2-V, 3.3-V, 4.7-V, 4.75-V, 4.8-V and 5-V Outputs Standard
- Logic Controlled Enable
- Stable with Ceramic and High-Quality Tantalum Capacitors
- Fast Turnon
- Thermal Shutdown and Short-Circuit Current Limit
Texas Instruments LP3985IM5X-4.7/NOPB's Applications
- CDMA Cellular Handsets
- Wideband CDMA Cellular Handsets
- GSM Cellular Handsets
- Portable Information Appliances
Texas Instruments LP3985IM5X-4.7/NOPB's Attributes
Type |
Description |
Category |
Integrated Circuits (ICs)
Power Management (PMIC)
Voltage Regulators - Linear
Low Drop Out (LDO) Regulators |
Mfr |
Texas Instruments |
Packaging |
Tape & Reel (TR)
Cut Tape (CT) |
Part Status |
Active |
Output Configuration |
Positive |
Output Type |
Fixed |
Number of Regulators |
1 |
Voltage - Input (Max) |
6V |
Voltage - Output (Min/Fixed) |
4.7V |
Voltage Dropout (Max) |
0.1V @ 150mA |
Current - Output |
150mA |
Current - Quiescent (Iq) |
150 µA |
Current - Supply (Max) |
250 µA |
PSRR |
50dB ~ 40dB (1kHz ~ 10kHz) |
Control Features |
Enable |
Protection Features |
Over Current, Over Temperature, Short Circuit |
Operating Temperature |
-40°C ~ 125°C |
Mounting Type |
Surface Mount |
Package / Case |
SC-74A, SOT-753 |
Supplier Device Package |
SOT-23-5 |
Base Product Number |
LP3985 |
Texas Instruments LP3985IM5X-4.7/NOPB's Category-Low Drop Out(LDO) Regulators
LDO stands for Low Dropout Regulator, which is a low-power low-dropout linear voltage regulator. It automatically adjusts the voltage occupied by the transistor or field-effect transistor in the linear region through internal negative feedback to obtain a stable output voltage drop from the input voltage.
Under the condition of changes in input voltage or load current, LDO can still maintain a stable output voltage; it has extremely low inherent noise and a high power supply rejection ratio (PSRR). More details: Introduction and Common Types of Linear Low Dropout Voltage Regulator Chips.
Manufacturer of LP3985IM5X-4.7/NOPB - Texas Instruments
TI is an international semiconductor company in the United States, headquartered in Dallas, Texas. The company was established in 1930 and has more than 100 offices worldwide, with more than 43,000 employees in the United States, Europe, Asia, and Latin America. TI is a global leading semiconductor manufacturer and has an important influence on multiple fields such as computers, communications, industrial control, and healthcare.
The history of Texas Instruments can be traced back to 1930 when inventor and engineer James Korklewski established Geophysical Service Incorporation to create a sales company for electronic equipment. In 1941, TI was restructured into an independent company and began to engage in scientific and technological research and development and semiconductor production. TI first introduced transistors in the 1950s. In the 1960s, the company began to engage in the integrated circuit industry and produced the world's first single-chip microcomputer in 1971, which greatly changed the development model of the computer industry.
Texas Instruments products include analog integrated circuits, digital signal processors, single-chip microcontrollers, power management devices, chip solutions, and radio frequency controllers. These electrical components are sold to the aerospace, defense, industrial, personal electronics, and communications markets. They cover portable audio devices, high-definition televisions, car navigation, mobile phones, automotive signal processing, industrial control equipment, and security protection.
Texas Instruments' globalization strategy relies on an understanding of cross-cultural, language, and technology. In the past few decades, TI has expanded its business globally. It is very popular in the Asian market. The company has opened offices and factories in China, Southeast Asia, and India, aiming to expand its market share and improve competitiveness. More detail: Analog Semiconductor Leader – TI (Texas Instruments)
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