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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Texas Instruments LP38842S-1.2/NOPB

Name: LP38842S-1.2/NOPB
Brand: Texas Instruments
SKU: LP38842S-1.2/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LP38842S-1.2/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Datasheet:: LP38842S-1.2/NOPB.pdf

Description:: IC REG LINEAR 1.2V 1.5A DDPAK

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Product details

Overview

LP38842S-1.2/NOPB from Texas Instruments is a 1.5A ultra-low-dropout linear regulator with fixed 1.2V output, N-MOS pass transistor architecture, 115mV typical dropout at full load, ±1.5% initial output accuracy, and stable operation with ceramic output capacitors ≥22µF. It is used in FPGA core power supplies, DSP post-regulation, and server I/O rails where tight voltage tolerance and fast transient response are required.

For engineers reviewing the LP38842S-1.2/NOPB datasheet, LP38842S-1.2/NOPB pinout, LP38842S-1.2/NOPB application, or LP38842S-1.2/NOPB equivalent, key selection considerations include its dual-rail operation (VIN + VBIAS), shutdown control via S/D pin, thermal protection, and compatibility with low-ESR ceramic capacitors - critical for high-density embedded power delivery.

Technical Context

The LP38842S-1.2/NOPB employs a CMOS-based N-MOS pass transistor driven by an independent VBIAS rail (4.5–5.5V), enabling ultra-low dropout operation even when VIN is only ~100mV above VOUT. Its internal bias circuitry includes under-voltage lockout below ~4V on VBIAS and thermal shutdown at junction temperatures exceeding 150°C.

It delivers 1.5A continuous output current with 30nA shutdown current, 0.1%/A load regulation, and 0.01%/V line regulation. PSRR reaches 80dB at 120Hz on VIN and 58dB on VBIAS, while output noise is 150µV_rms (10Hz–100kHz) - optimized for noise-sensitive analog and digital loads.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.2V ±1.5% at 25°C; maintains regulation across −40°C to +125°C junction temperature range.
Dropout Voltage	115mV typical at 1.5A load; enables operation from input as low as 1.315V, critical for post-regulation of SMPS outputs.
Quiescent Current	30mA typical from VIN at full load; drops to 30nA in shutdown - preserves battery life in always-on systems.
Output Capacitor Support	Stable with ≥22µF X7R/X5R ceramic (not Z5U/Y5V); allows compact, low-ESR filtering without tantalum.
Thermal Protection	Internally limits junction temperature to ≤150°C; θ_J-A = 35°C/W with 1 in² copper plane (DDPAK/TO-263 package).
Shutdown Threshold	V_SDT = 0.7–1.3V for turn-on; <0.7V for turn-off; supports direct logic-level control without external level-shifting.
PSRR @ 120Hz	80dB on VIN, 58dB on VBIAS - suppresses switching ripple from upstream converters and bias rails.

Pinout & Package

LP38842S-1.2/NOPB uses the DDPAK/TO-263 (KTT) 5-pin surface-mount package with exposed thermal pad (pin 3 and tab connected to GND). The package supports high-power dissipation via PCB copper plane heatsinking and is RoHS exempt with Sn lead finish.

Pin/Terminal	Circuit Role	Design Meaning
1 – IN	Main power input	High-current path for regulated load; accepts VIN ≥ (VOUT + VDO) up to 5.5V; requires ≥10µF ceramic input capacitor.
2 – BIAS	Bias supply input	Provides gate drive for N-MOS pass device; must be 4.5–5.5V; monitored for UVLO; decoupled with 0.1µF ceramic.
3 – GND	Power and analog ground	Common reference for all circuits; electrically tied to exposed thermal tab; must be low-impedance connection to PCB ground plane.
4 – OUT	Regulated output	Delivers 1.2V at up to 1.5A; requires ≥22µF ceramic output capacitor placed within 1 cm and returned to clean analog ground.
5 – S/D	Shutdown control	Active-low enable; pulls output OFF when <0.7V; must be pulled up to VBIAS (10–100kΩ) if not actively driven.

Key Features

Feature	Design Value
N-MOS pass transistor with external VBIAS	Enables dropout as low as 115mV at 1.5A while maintaining high bandwidth and stability with ceramic capacitors.
Ultra-low shutdown current	30nA typical ensures minimal leakage in battery-backed or energy-harvesting systems during standby.
Integrated over-temperature and over-current protection	Prevents damage during fault conditions without external circuitry; automatically recovers after thermal cooldown.
High PSRR on both VIN and VBIAS inputs	80dB (VIN) and 58dB (VBIAS) at 120Hz suppresses ripple from switching converters and noisy bias sources.
Stable with ceramic output capacitors only	Eliminates need for higher-ESR tantalum; reduces board area, cost, and aging-related drift in precision applications.

Applications

ASIC Power Supplies	Server Core & I/O Supplies
Use Scenario: Powering GPU voltage domains and PCIe controller I/O banks in desktop graphics cards and servers. IC Role / Device Role / Timing Role: Post-regulator delivering clean, tightly regulated 1.2V to high-speed digital logic with fast load-step response. Use Value: Maintains 1.2V ±18mV under 1.5A transient steps due to low output impedance and 150µV_rms noise floor.	Use Scenario: Providing auxiliary 1.2V rails for memory buffers, BMC controllers, and baseboard management subsystems. IC Role / Device Role / Timing Role: Low-noise, thermally robust LDO supplying power to timing-critical monitoring ICs and sensor interfaces. Use Value: Delivers 1.5% initial accuracy and 0.1%/A load regulation - ensuring reliable operation across wide ambient temperature ranges (−40°C to +125°C).
DSP/FPGA Core Supplies	SMPS Post-Regulator
Use Scenario: Regulating core voltage for Xilinx Artix-7 or TI C6000 DSPs where dynamic current draw exceeds 1A. IC Role / Device Role / Timing Role: High-current LDO compensating for SMPS ripple and load-induced droop in programmable logic cores. Use Value: 115mV dropout enables use with 1.35V SMPS outputs; 80dB PSRR attenuates 120Hz switching artifacts before reaching sensitive logic.	Use Scenario: Final-stage regulation after a 3.3V buck converter powering industrial PLC I/O modules. IC Role / Device Role / Timing Role: Precision low-noise filter stage removing residual switching noise and improving voltage accuracy. Use Value: 150µV_rms broadband noise and 0.01%/V line regulation ensure stable ADC references and analog front-end performance.

ASIC Power Supplies

Server Core & I/O Supplies

Use Scenario: Powering GPU voltage domains and PCIe controller I/O banks in desktop graphics cards and servers.

IC Role / Device Role / Timing Role: Post-regulator delivering clean, tightly regulated 1.2V to high-speed digital logic with fast load-step response.

Use Value: Maintains 1.2V ±18mV under 1.5A transient steps due to low output impedance and 150µV_rms noise floor.

Use Scenario: Providing auxiliary 1.2V rails for memory buffers, BMC controllers, and baseboard management subsystems.

IC Role / Device Role / Timing Role: Low-noise, thermally robust LDO supplying power to timing-critical monitoring ICs and sensor interfaces.

Use Value: Delivers 1.5% initial accuracy and 0.1%/A load regulation - ensuring reliable operation across wide ambient temperature ranges (−40°C to +125°C).

DSP/FPGA Core Supplies

SMPS Post-Regulator

Use Scenario: Regulating core voltage for Xilinx Artix-7 or TI C6000 DSPs where dynamic current draw exceeds 1A.

IC Role / Device Role / Timing Role: High-current LDO compensating for SMPS ripple and load-induced droop in programmable logic cores.

Use Value: 115mV dropout enables use with 1.35V SMPS outputs; 80dB PSRR attenuates 120Hz switching artifacts before reaching sensitive logic.

Use Scenario: Final-stage regulation after a 3.3V buck converter powering industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Precision low-noise filter stage removing residual switching noise and improving voltage accuracy.

Use Value: 150µV_rms broadband noise and 0.01%/V line regulation ensure stable ADC references and analog front-end performance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPL7407LDR	7-channel 200mA sink driver (not LDO); no fixed 1.2V output; lacks VBIAS rail and >1A capability.	Designed for LED/relay driving, not point-of-load regulation; unsuitable for 1.2V/1.5A core power.	Select LP38842S-1.2/NOPB for single-rail, high-current, low-dropout regulation - TPL7407LDR serves entirely different functional role.
TPS7A4701RGWR	1A ultra-low-noise LDO (4µV_rms), but fixed 1.2V version unavailable; adjustable only; dropout 300mV @ 1A.	Better noise performance but lower current rating and higher dropout; requires external resistor network for 1.2V setup.	Choose LP38842S-1.2/NOPB when 1.5A output, 115mV dropout, and factory-trimmed 1.2V are mandatory; TPS7A4701RGWR fits ultra-low-noise analog biasing at lower current.

Compared with TPS7A4701RGWR, LP38842S-1.2/NOPB delivers 50% more output current and 62% lower dropout at full load, while eliminating external feedback components - simplifying layout and improving reliability in high-density digital power systems.

Availability

LP38842S-1.2/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, server I/O rails, and DSP post-regulation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LP38842S-1.2/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability linear regulators and power delivery solutions.

The LP38842S-1.2/NOPB belongs to TI's ultra-low-dropout LDO family designed specifically for high-current, low-noise point-of-load regulation in computing, networking, and industrial control systems where efficiency, thermal robustness, and ceramic capacitor compatibility are essential.

FAQ

What is the minimum input voltage required for LP38842S-1.2/NOPB to maintain regulation?

The LP38842S-1.2/NOPB requires VIN ≥ (VOUT + VDO), where VDO is 115mV typical at 1.5A. Thus, minimum VIN is ~1.315V under full load. At lighter loads, dropout decreases further. Note that VBIAS must also be maintained at 4.5–5.5V independently for proper gate drive and regulation.

Can LP38842S-1.2/NOPB operate without an external VBIAS supply?

No. LP38842S-1.2/NOPB requires an external 4.5–5.5V VBIAS rail to drive the N-MOS pass transistor gate. Without VBIAS, the device cannot regulate - it is not a single-supply LDO. The VBIAS pin must be decoupled with a 0.1µF ceramic capacitor and monitored for UVLO (~4V threshold).

What output capacitor types and values are validated for LP38842S-1.2/NOPB stability?

LP38842S-1.2/NOPB is stable with ≥22µF X7R or X5R ceramic capacitors (not Z5U/Y5V). Tantalum capacitors require ≥4.7µF but are not recommended due to ESR sensitivity and aging effects. All capacitors must be placed within 1 cm of the OUT pin and returned to a low-impedance analog ground.

Does LP38842S-1.2/NOPB include built-in protection features?

Yes. LP38842S-1.2/NOPB integrates over-temperature shutdown (activates at ~150°C junction), current limiting, and short-circuit protection (ISC ≈ 4A). It also features under-voltage lockout on the VBIAS rail and active-low shutdown with 30nA quiescent current when S/D is pulled low.

Is LP38842S-1.2/NOPB pin-compatible with other members of the LP3884x family?

Yes. LP38842S-1.2/NOPB shares identical DDPAK/TO-263 (KTT) 5-pin pinout and footprint with LP38842S-0.8/NOPB and LP38842S-1.5/NOPB. Only the output voltage is trimmed at factory; all electrical characteristics, thermal behavior, and control functions remain consistent across the family.

LP38842S-1.2/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Packaging:: Tube

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.315V @ 1.5A

Current - Output:: 1.5A

Current - Quiescent (Iq):: 30 µA

Current - Supply (Max):: 40 mA

PSRR:: 80dB ~ 65dB (120Hz ~ 1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-263 (DDPAK-5)

LP38842S-1.2/NOPB FAQ

1.How can I place an order for LP38842S-1.2/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LP38842S-1.2/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LP38842S-1.2/NOPB reliable?

The price and inventory of LP38842S-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38842S-1.2/NOPB is usually 5 days.

3.What payment methods are accepted for LP38842S-1.2/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38842S-1.2/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LP38842S-1.2/NOPB?

LP38842S-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LP38842S-1.2/NOPB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LP38842S-1.2/NOPB?

For technical support, including LP38842S-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38842S-1.2/NOPB requirements.

6.How does Aetrix verify that LP38842S-1.2/NOPB is sourced from the original manufacturer or authorized distributors?

All LP38842S-1.2/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP38842S-1.2/NOPB meets industry standards.

7.What is the process for return or replacement of LP38842S-1.2/NOPB?

All LP38842S-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38842S-1.2/NOPB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LP38842S-1.2/NOPB part is unused and in its original packaging.

Return procedure for LP38842S-1.2/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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