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STMicroelectronics LDR1833K7-R
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- Part No.:
- LDR1833K7-R
- Manufacturer:
- STMicroelectronics
- Package:
- SPAK-7 (7 Leads + Tab)
- Datasheet:
-
LDR1833K7-R.pdf
- Description:
- IC REG LINEAR 1.8V/3.3V 7SPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,784
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Product details
Overview
LDR1833K7-R from STMicroelectronics is a dual low-dropout linear voltage regulator with fixed 1.8 V and 3.3 V outputs, delivering up to 500 mA on VO1 and 1.0 A on VO2. It features ultra-low dropout (0.3 V @ 500 mA, 0.4 V @ 1 A), 50 µA shutdown current, and operates across –40 °C to +125 °C - designed for power-sensitive data storage systems like Microdrive and PDA mainboard rails.
For engineers reviewing the LDR1833K7-R datasheet, LDR1833K7-R pinout, LDR1833K7-R application, or LDR1833K7-R equivalent, this device supports dual-rail sequencing in compact consumer electronics where low-noise, low-quiescent-current regulation and independent TTL-compatible enable control per channel are critical selection criteria.
Technical Context
The LDR1833K7-R integrates two independent LDO regulators sharing a common ground but with separate input (VI1, VI2) and enable (INH1, INH2) pins. Each regulator employs a bandgap reference, error amplifier, and thermal/current limiting circuitry - enabling stable operation with only 4.7 µF low-ESR ceramic output capacitors.
Its high-voltage process allows 15 V absolute maximum input, while supply voltage rejection reaches 70 dB at 120 Hz. The device uses internal current limiting and thermal shutdown to protect against overload and junction overheating, with RthJC = 8 °C/W for the PPAK package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VO1 / VO2 | 1.8 V / 3.3 V fixed outputs - eliminates external feedback resistors and ensures ±5% accuracy over temperature and load. |
| IO1 / IO2 max | 500 mA / 1.0 A - supports core logic and I/O rail requirements in portable storage controllers without external boost stages. |
| VDROP1 / VDROP2 | 0.3 V @ 500 mA / 0.4 V @ 1 A - enables regulation from tight input margins (e.g., 2.1 V input for 1.8 V rail), minimizing power loss. |
| IQ (ON) | 1.6 mA max - reduces idle power in always-on subsystems such as real-time clock or standby memory retention circuits. |
| IQ (OFF) | 50 µA typ. - allows deep-sleep mode activation via INH pins, critical for battery-backed data storage applications. |
| SVR | 70 dB typ. at 120 Hz - suppresses ripple from noisy DC-DC pre-regulators, preserving signal integrity in analog sensor interfaces. |
| Operating temp. | –40 °C to +125 °C - qualified for extended-temperature industrial and automotive infotainment auxiliary rails. |
Pinout & Package
Supplied in thermally enhanced PPAK (Power Package) - 5-pin exposed-pad surface-mount package with RthJC = 8 °C/W, optimized for high-power density PCB layouts and automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Common ground reference | Shared return path for both regulators; must be connected to low-impedance PCB plane for stability and thermal conduction. |
| VI1 | Input supply for VO1 (1.8 V) | Accepts up to 15 V; requires 2.2 µF bypass capacitor to GND to suppress high-frequency noise and ensure transient response. |
| VI2 | Input supply for VO2 (3.3 V) | Independent input allows different upstream sources (e.g., buck converter vs. battery); same bypass requirement as VI1. |
| VO1 | 1.8 V regulated output | Delivers up to 500 mA; requires ≥4.7 µF low-ESR ceramic capacitor to GND for loop stability and load transient suppression. |
| VO2 | 3.3 V regulated output | Delivers up to 1.0 A; same capacitor requirement as VO1; decoupling must be placed adjacent to pin for minimal trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs (INH1/INH2) | TTL-compatible logic control allows selective shutdown of either rail - enabling dynamic power gating in multi-voltage SoC systems. |
| Stable with 4.7 µF ceramic output caps | Eliminates need for costly tantalum or polymer capacitors - reduces BOM cost and improves reliability in space-constrained designs. |
| Internal current & thermal protection | Auto-recovery short-circuit limit (500 mA / 1.6 A) and thermal shutdown prevent damage during fault conditions without external circuitry. |
| Low-noise output (0.003% VO RMS) | Enables clean power delivery to noise-sensitive analog blocks (e.g., ADC references, PLL VCO supplies) without added filtering. |
Applications
| Microdrive Power Management | PDA Mainboard Dual-Rail Supply |
|---|---|
|
Use Scenario: Regulating 1.8 V NAND flash I/O and 3.3 V controller core in miniature rotating-media storage modules. IC Role / Device Role / Timing Role: Primary dual-rail LDO supplying critical timing domains for flash interface and microcontroller subsystems. Use Value: Ultra-low dropout preserves margin under battery droop; independent enable pins support sleep/wake sequencing without external logic. |
Use Scenario: Providing 1.8 V processor core and 3.3 V peripheral I/O rails in handheld personal digital assistants. IC Role / Device Role / Timing Role: Central power management IC coordinating voltage sequencing and low-power state transitions. Use Value: 50 µA shutdown current extends battery life during standby; 70 dB SVR prevents display flicker from switching regulator coupling. |
| Set-Top Box AV Processor Rails | Industrial Data Logger Sensor Interface |
|
Use Scenario: Generating clean 1.8 V and 3.3 V supplies for video decoder ASICs and HDMI PHY in consumer set-top boxes. IC Role / Device Role / Timing Role: Low-noise post-regulator for noise-sensitive video processing blocks requiring stable reference voltages. Use Value: 0.003% VO RMS noise avoids visible artifacts in decoded video; wide temperature range ensures reliability in unventilated enclosures. |
Use Scenario: Powering 1.8 V precision ADC front-end and 3.3 V microcontroller in battery-operated environmental monitoring loggers. IC Role / Device Role / Timing Role: Precision analog power source ensuring measurement repeatability across operating temperature extremes. Use Value: ±5% output tolerance and –40 °C to +125 °C operation maintain calibration integrity in outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM1014IDT | Single-channel, 1.25–36 V adjustable output; no dual-rail capability; higher dropout (1.2 V @ 100 mA) | Suitable only for single-rail replacement; lacks independent enable and dual-output coordination | Select only if redesign permits splitting rails and accepting higher dropout and quiescent current (80 µA min) |
| TPS7A2033PDBVR | Single 3.3 V LDO (300 mA), 0.17 V dropout @ 300 mA; no 1.8 V channel; 25 µA IQ in shutdown | Requires two separate devices to replicate dual functionality; increases board area and BOM count | Use when higher PSRR (75 dB) and lower noise are prioritized over integration and footprint efficiency |
Compared with TSM1014IDT and TPS7A2033PDBVR, the LDR1833K7-R uniquely delivers matched dual-rail regulation with coordinated enable control and ultra-low dropout in a single PPAK package - reducing design complexity and PCB area while maintaining thermal robustness across extended temperature ranges.
Availability
LDR1833K7-R is available at Aetrix Electronics and suitable for Microdrive power management, PDA mainboard dual-rail supply, and industrial data logger sensor interface applications requiring stable component supply, long-lifecycle support, and consistent parametric performance.
Supply support for LDR1833K7-R 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
The LDR1833K7-R belongs to ST's low-dropout linear regulator product line, engineered specifically for compact, low-noise, dual-rail power delivery in portable data storage and handheld computing platforms.
FAQ
What is the maximum input voltage rating for LDR1833K7-R?
The absolute maximum DC input voltage for both VI1 and VI2 is 15 V, with recommended operating range up to 12 V. Exceeding 15 V risks permanent damage per the datasheet's absolute maximum ratings table. Input voltage must remain at least 0.3 V above each output voltage to maintain regulation.
Can LDR1833K7-R operate with ceramic output capacitors smaller than 4.7 µF?
No - the device requires a minimum of 4.7 µF low-ESR ceramic capacitor on each output for guaranteed stability across all load and temperature conditions. Using smaller values may cause oscillation or poor transient response, as confirmed in Section 5 (Electrical Characteristics) and Figure 25 (Load Transient).
How does the thermal protection behave during overload?
When junction temperature exceeds safe limits, the device enters thermal shutdown, disabling both outputs until temperature falls below the hysteresis threshold (~15 °C below trip point). Recovery is automatic and does not require cycling INH pins - verified in Figure 24 (Thermal Protection vs VO1) and Table 3 (Maximum Ratings).
Is LDR1833K7-R pin-compatible with other variants in the LDR1833/LDR2533 family?
Yes - all PPAK-packaged variants (LDR1833PT-R, LDR2533PT-R, LDR1833K7-R) share identical pinout, package dimensions, and thermal characteristics. Only output voltage combinations differ; no PCB layout change is needed when substituting within the family.
LDR1833K7-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SPAK-7 (7 Leads + Tab)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.8V, 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 1A
- Current - Output:
- 500mA, 1A
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- 1.6 mA
- PSRR:
- 70dB (120Hz)
- 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:
- 7-SPAK
LDR1833K7-R FAQ
1.How can I place an order for LDR1833K7-R through Aetrix?
Please submit a Request for Quotation (RFQ) for LDR1833K7-R 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 LDR1833K7-R reliable?
The price and inventory of LDR1833K7-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDR1833K7-R is usually 5 days.
3.What payment methods are accepted for LDR1833K7-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDR1833K7-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDR1833K7-R?
LDR1833K7-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDR1833K7-R 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 LDR1833K7-R?
For technical support, including LDR1833K7-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDR1833K7-R requirements.
6.How does Aetrix verify that LDR1833K7-R is sourced from the original manufacturer or authorized distributors?
All LDR1833K7-R 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 LDR1833K7-R meets industry standards.
7.What is the process for return or replacement of LDR1833K7-R?
All LDR1833K7-R units undergo pre-shipment inspection (PSI). If there is an issue with LDR1833K7-R, 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 LDR1833K7-R part is unused and in its original packaging.
Return procedure for LDR1833K7-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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