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Analog Devices Inc. LT3020IDD-1.2#PBF
- Part No.:
- LT3020IDD-1.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3020IDD-1.2#PBF.pdf
- Description:
- IC REG LINEAR 1.2V 100MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:116
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Product details
Overview
LT3020IDD-1.2#PBF from Analog Devices (formerly Linear Technology) is a 100mA, very low dropout (VLDO™) linear regulator in an 8-lead DFN package, delivering a fixed 1.2V output with typical dropout voltage of 150mV at 100mA, minimum input voltage of 0.9V, and quiescent current of 120µA - ideal for ultra-low-voltage battery-powered systems such as cellular handsets and wireless modems.
For engineers reviewing the LT3020IDD-1.2#PBF datasheet, LT3020IDD-1.2#PBF pinout, LT3020IDD-1.2#PBF application, or LT3020IDD-1.2#PBF equivalent, key selection criteria include guaranteed 1.2V output accuracy (±2.5% over temperature), reverse-battery protection, no reverse current flow, stability with 2.2µF ceramic output capacitors, and thermal limiting with hysteresis for robust operation in compact portable designs.
Technical Context
The LT3020IDD-1.2#PBF employs a proprietary VLDO architecture enabling regulation down to 0.9V input while maintaining 1.2V output - critical for single-cell Li-ion or NiMH applications where input voltage collapses near end-of-discharge. Its internal resistor divider sets VOUT = 1.2V with reference voltage of 200mV at the ADJ node, and the device operates without external feedback components.
Protection circuitry includes reverse-battery tolerance (±10V on IN), reverse-output current limitation (<5µA at VOUT = 1.2V, VIN = 0V), current limiting (110–310mA depending on condition), and thermal shutdown with hysteresis (TJMAX = 125°C). Shutdown is controlled via SHDN pin with 0.25V–0.9V threshold and draws only 3–9µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±2.5% over full temperature range (–40°C to 125°C); enables direct replacement of 1.2V logic rails without external resistors. |
| Dropout Voltage | 150mV typical at 100mA load; allows >90% efficiency at 1.2V out from 1.35V input - superior to switching alternatives in noise-sensitive analog sections. |
| Input Voltage Range | 0.9V to 10V; supports single-cell alkaline/NiMH (0.9V cutoff) and Li-ion (up to 4.2V), eliminating need for pre-regulation stages. |
| Quiescent Current | 120µA typical at full load; drops to 3–9µA in shutdown - extends battery life in always-on standby modes. |
| Output Capacitor | Stable with ≥2.2µF ceramic capacitor (ESR ≤0.3Ω); eliminates bulk tantalum, reduces board area, and improves reliability vs. electrolytic solutions. |
| Ripple Rejection | 60dB at 120Hz (VIN–VOUT = 1V); suppresses low-frequency supply ripple from DC-DC converters or noisy battery sources. |
| Load Regulation | ±6mV from 1mA to 100mA (1.2V output); ensures stable core voltage under dynamic processor load transitions. |
Pinout & Package
LT3020IDD-1.2#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 9 = GND), 0.75mm profile, and RoHS-compliant #PBF finish. The exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 35°C/W) and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT | Power output terminals | Parallel outputs reduce trace resistance and improve current sharing; connect directly to load and output capacitor. |
| 3 - OUT SENSE (Fixed) | Internal feedback sense node | Internally tied to output; must be shorted to Pins 1/2 for optimal regulation accuracy and transient response. |
| 4 - GND | Main ground reference | Primary return path for error amplifier and bias circuits; connects to exposed pad (Pin 9) for lowest impedance. |
| 5 - SHDN | Active-low enable control | Pull low ≤0.61V to disable output; pulls <1µA when high; requires pull-up if driven by open-drain logic. |
| 7, 8 - IN | Input power supply inputs | Parallel inputs reduce series resistance and inductance; bypass capacitor (2.2–10µF) required if >6" from source. |
| 9 - Exposed Pad | Thermal & electrical ground | Mandatory GND connection; soldered to PCB copper pour to achieve θJA = 35°C/W and prevent thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| No reverse current flow | Eliminates need for external blocking diode in backup-battery or dual-supply configurations - saves BOM cost and forward-drop loss. |
| Reverse-battery protection | Withstands –10V on IN pin with <1µA leakage - prevents damage and system failure during incorrect battery insertion in handheld devices. |
| No-load recovery circuit | Active current sink engages at +6% VOUT overshoot, discharging output cap in <1ms - prevents sustained overvoltage after sudden load removal. |
| Stable with low-ESR ceramics | Enables use of small, reliable, low-cost 2.2µF X5R/X7R MLCCs instead of larger, aging-prone tantalum capacitors. |
| Thermal limiting with hysteresis | Shuts down at 125°C junction and restarts only after cooling ~15°C - avoids oscillatory shutdown/restart during sustained overload. |
Applications
| Cellular Handset Core Power | Wireless Modem RF Bias |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V) from single-cell Li-ion (2.8–4.2V) with tight space constraints and aggressive battery life targets. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout LDO supplying regulated 1.2V to CPU core; replaces inefficient discrete regulators or higher-quiescent switching solutions. Use Value: Delivers 100mA at 150mV dropout, enabling >90% efficiency even at 3.0V input - extending talk time by up to 12% versus standard LDOs. | Use Scenario: Providing clean 1.2V bias to RF power amplifier stages in Bluetooth/Wi-Fi modules where switching noise would degrade EVM or ACLR. IC Role / Device Role / Timing Role: Low-noise post-regulator filtering switcher ripple; leverages 60dB 120Hz ripple rejection and 245µVRMS output noise (10Hz–100kHz). Use Value: Maintains RF linearity and spectral purity without requiring additional LC filtering - reducing bill-of-materials and PCB area by 30%. |
| Pager System Logic Supply | Low-Power Sensor Node MCU |
Use Scenario: Delivering 1.2V to microcontroller and display driver in legacy pager designs operating from two alkaline cells (1.8–3.2V) with cold-temperature requirements. IC Role / Device Role / Timing Role: Fixed-output LDO supporting –40°C to 125°C operation; uses internal feedback to eliminate external resistor drift errors. Use Value: Guaranteed 1.2V output across full temp range with ±2.5% tolerance - ensures reliable LCD contrast and timing margin at –40°C. | Use Scenario: Powering ultra-low-power ARM Cortex-M0+ MCU in battery-operated IoT sensor nodes with multi-year battery life targets. IC Role / Device Role / Timing Role: Always-on LDO in sleep mode (120µA IQ) and shutdown mode (3µA); integrates reverse-current and reverse-battery protection. Use Value: Eliminates need for external protection diodes and enables true zero-leakage shutdown - achieving 5-year shelf life on CR2032 coin cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM1012-1.2 | Higher dropout (200mV typ at 100mA), wider input range (1.4–6.5V), no reverse-battery protection | Suitable for higher-input systems but not single-cell sub-1V start-up; lacks reverse-input tolerance | Select when input never falls below 1.4V and reverse-battery risk is absent. |
| MCP1826-1202E/DB | Same 1.2V output, 150mV dropout, but higher quiescent current (250µA), no no-load recovery circuit | Lacks fast light-load transient recovery - may cause overshoot in burst-mode sensor wakeups | Prefer for cost-sensitive, non-transient-critical applications where 130µA IQ penalty is acceptable. |
Compared with TSM1012-1.2 and MCP1826-1202E/DB, LT3020IDD-1.2#PBF uniquely combines sub-1V start-up capability, reverse-battery immunity, and active no-load recovery - making it the only choice for ruggedized, single-cell, high-transient portable designs.
Availability
LT3020IDD-1.2#PBF is available at Aetrix Electronics and suitable for cellular handset core power, wireless modem RF bias, and low-power sensor node MCU applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3020IDD-1.2#PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full product continuity, technical support, and manufacturing for the LT® portfolio of precision analog ICs.
The LT3020 series was designed specifically for ultra-low-voltage, high-efficiency power management in portable battery-powered equipment - emphasizing minimal dropout, micropower operation, and integrated protection for field-reliable deployment.
FAQ
What is the minimum input voltage required for LT3020IDD-1.2#PBF to deliver full 100mA output current?
The LT3020IDD-1.2#PBF requires a minimum input voltage of 0.9V at TJ > 0°C and 1.10V at TJ < 0°C to sustain 100mA output current while maintaining regulation. This specification is verified per Note 14 in the datasheet and enables operation from deeply discharged single-cell batteries.
Does LT3020IDD-1.2#PBF require an external feedback resistor network?
No. LT3020IDD-1.2#PBF is a fixed-output variant with internal resistor divider; Pins 1, 2, and 3 (OUT/OUT/OUT SENSE) must be shorted together on the PCB. External resistors are only needed for the adjustable LT3020-ADJ version.
Can LT3020IDD-1.2#PBF be used in applications where the input supply may be reversed?
Yes. LT3020IDD-1.2#PBF features reverse-battery protection and withstands –10V on the IN pin with <1µA reverse leakage current. It blocks reverse current flow and prevents damage or system malfunction during incorrect battery installation.
What is the purpose of the exposed pad (Pin 9) on the LT3020IDD-1.2#PBF DFN package?
The exposed pad (Pin 9) on LT3020IDD-1.2#PBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA = 35°C/W and ensure reliable thermal performance - failure to do so risks premature thermal shutdown under load.
How does the no-load recovery circuit in LT3020IDD-1.2#PBF improve system reliability?
The no-load recovery circuit in LT3020IDD-1.2#PBF activates when output voltage exceeds +6% of nominal (1.272V), sinking up to 15mA to rapidly discharge the output capacitor. This prevents dangerous sustained overshoot after sudden load removal - protecting downstream 1.2V logic and enabling safe use in burst-mode sensor applications.
LT3020IDD-1.2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.285V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- 3.5 mA
- PSRR:
- 60dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT3020IDD-1.2#PBF FAQ
1.How can I place an order for LT3020IDD-1.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3020IDD-1.2#PBF 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 LT3020IDD-1.2#PBF reliable?
The price and inventory of LT3020IDD-1.2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3020IDD-1.2#PBF is usually 5 days.
3.What payment methods are accepted for LT3020IDD-1.2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3020IDD-1.2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3020IDD-1.2#PBF?
LT3020IDD-1.2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3020IDD-1.2#PBF 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 LT3020IDD-1.2#PBF?
For technical support, including LT3020IDD-1.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3020IDD-1.2#PBF requirements.
6.How does Aetrix verify that LT3020IDD-1.2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3020IDD-1.2#PBF 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 LT3020IDD-1.2#PBF meets industry standards.
7.What is the process for return or replacement of LT3020IDD-1.2#PBF?
All LT3020IDD-1.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3020IDD-1.2#PBF, 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 LT3020IDD-1.2#PBF part is unused and in its original packaging.
Return procedure for LT3020IDD-1.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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