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Analog Devices Inc. LT3020IDD-1.5#PBF
- Part No.:
- LT3020IDD-1.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3020IDD-1.5#PBF.pdf
- Description:
- IC REG LINEAR 1.5V 100MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
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Product details
Overview
LT3020IDD-1.5#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 1.5V output with typical dropout voltage of 150mV at 100mA, minimum input voltage of 0.9V, and quiescent current of 120µA - designed for ultra-low-voltage battery-powered systems such as cellular phones and wireless modems.
For engineers reviewing the LT3020IDD-1.5#PBF datasheet, LT3020IDD-1.5#PBF pinout, LT3020IDD-1.5#PBF application, or LT3020IDD-1.5#PBF equivalent, key selection criteria include guaranteed 1.5V output accuracy over temperature (±2.5% max), reverse-battery protection, no reverse current flow, stable operation with 2.2µF ceramic output capacitors, and thermal limiting with hysteresis.
Technical Context
The LT3020IDD-1.5#PBF uses a PNP pass transistor architecture enabling operation down to 0.9V input while maintaining regulation at 1.5V output. Its internal resistor divider fixes VOUT = 1.5V with reference voltage of 200mV at the ADJ node, and it incorporates a dedicated no-load recovery circuit that sinks up to 15mA to suppress output overshoot during light-load transients.
Protection functions are integrated at silicon level: reverse-battery protection blocks conduction when VIN < 0V; reverse-output protection prevents current flow from OUT to GND when VIN = 0V; current limit activates at ~110–310mA depending on VIN–VOUT differential; and thermal shutdown engages at TJ = 125°C with hysteresis to prevent oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.500V ±2.5% (1.447V to 1.545V) across full load and temperature range - ensures stable core supply for 1.5V logic or RF bias rails. |
| Dropout Voltage | 150mV typical at 100mA - enables regulation from 1.65V input, critical for single-cell Li-ion or NiMH systems near end-of-discharge. |
| Quiescent Current | 120µA typical at full load - minimizes standby power loss in always-on portable devices. |
| Shutdown Quiescent Current | 3µA typical - supports deep-sleep modes in battery-backed applications without compromising wake-up latency. |
| Output Capacitor Requirement | 2.2µF ceramic, ESR ≤0.3Ω - enables compact, low-BOM-count designs without tantalum or electrolytic capacitors. |
| Ripple Rejection | 58dB at 120Hz (VIN–VOUT = 1V) - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Load Regulation | ±7.5mV from 1mA to 100mA - maintains tight voltage control across dynamic load profiles in modem baseband ICs. |
Pinout & Package
LT3020IDD-1.5#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 9), rated for TJ = –40°C to 125°C. The exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (OUT) | Regulated output power terminal | Parallel pins reduce IR drop and improve current sharing; connect directly to load and output capacitor. |
| 3 (OUT SENSE) | Fixed-output voltage sense node | Internally tied to feedback divider; must be shorted to Pins 1 & 2 for optimal accuracy and stability. |
| 4 (GND) | Power and signal reference ground | Main ground return path; connects internally to exposed pad (Pin 9) - requires low-impedance PCB tie. |
| 5 (SHDN) | Active-low enable control input | Pull low (<0.61V) to disable output; pull high (>0.9V) to enable; draws only 2.3µA when active. |
| 7, 8 (IN) | Input power supply terminal | Parallel pins lower series resistance; accept input from 0.9V to 10V with reverse-battery tolerance to –10V. |
| 9 (EXPOSED PAD) | Thermal and electrical ground | Must be soldered to PCB ground plane; reduces θJA to 35°C/W and improves thermal reliability under load. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout operation | 150mV typical at 100mA enables use with single-cell batteries down to 1.65V input while sustaining 1.5V output. |
| No reverse current flow | Zero reverse current from OUT to IN even when VIN = 0V - eliminates need for external blocking diodes in backup power paths. |
| Stable with low-ESR ceramics | Guaranteed stability with 2.2µF X5R/X7R ceramic capacitors - reduces board area and cost vs. tantalum alternatives. |
| No-load recovery circuit | Integrated 15mA current sink activates at +6% VOUT overshoot - eliminates ms-scale undershoot/overshoot during sleep-wake transitions. |
| Reverse-battery protection | Withstands –10V on IN pin with <1µA leakage - protects downstream circuitry from accidental battery reversal in handheld devices. |
Applications
| Cellular Phone Baseband | Wireless Modem RF Bias |
|---|---|
Use Scenario: Powering baseband processor I/O and memory interfaces in GSM/UMTS handsets operating from single Li-ion cell (2.8–4.2V). IC Role / Device Role / Timing Role: Primary 1.5V LDO supplying low-noise, tightly regulated voltage to digital logic blocks with fast transient response. Use Value: Maintains 1.5V ±2.5% across battery discharge curve and load steps up to 100mA, preventing logic errors and timing violations. |
Use Scenario: Providing clean 1.5V bias to PA driver stages and RF synthesizer circuits in LTE/Wi-Fi modules. IC Role / Device Role / Timing Role: Low-noise post-regulator rejecting ripple from switching DC/DC converters feeding RF subsystems. Use Value: Delivers 58dB ripple rejection at 120Hz and 245µVRMS output noise (10Hz–100kHz), preserving EVM and adjacent channel leakage. |
| Pager Power Management | Low-Power Sensor Node |
Use Scenario: Supplying real-time clock, display controller, and flash memory in legacy pagers using alkaline/NiMH cells. IC Role / Device Role / Timing Role: Ultra-low-quiescent LDO enabling multi-week standby via 3µA shutdown mode and 120µA active IQ. Use Value: Extends battery life by >30% vs. standard LDOs due to sub-µA shutdown and minimal load-dependent GND current. |
Use Scenario: Regulating 1.5V for microcontroller peripherals and analog sensors in energy-harvesting IoT nodes. IC Role / Device Role / Timing Role: Input-capable LDO accepting 0.9V–10V sources (e.g., boost converter output or solar harvester) with no external components. Use Value: Eliminates need for pre-regulation stage - simplifies BOM and enables direct connection to wide-input PMIC outputs. |
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 |
|---|---|---|---|
| TPS7A0515PDBVR | 150mA output, 200mV dropout at 100mA, 25µA IQ, no reverse-battery protection | Lacks reverse-input tolerance and no-load recovery; requires external diode for battery reversal immunity | Prefer for ultra-low-IQ applications where reverse protection is handled externally and thermal budget allows higher dropout |
| MCP1804T-1502I/OT | 150mA output, 300mV dropout at 100mA, 3µA shutdown IQ, no reverse-current blocking | Higher dropout limits usable input range; no integrated reverse-current protection necessitates external MOSFET | Choose when cost sensitivity outweighs efficiency and protection requirements, and board space permits discrete protection |
Compared with TPS7A0515PDBVR and MCP1804T-1502I/OT, LT3020IDD-1.5#PBF uniquely combines 150mV dropout, reverse-battery tolerance, zero reverse current, and no-load recovery - making it irreplaceable in space-constrained, single-cell battery systems requiring robust fault immunity.
Availability
LT3020IDD-1.5#PBF is available at Aetrix Electronics and suitable for cellular phone baseband, wireless modem RF bias, and pager power management requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and medical-grade designs.
Supply support for LT3020IDD-1.5#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and automotive markets.
The LT3020 series was designed specifically for ultra-low-input-voltage, high-efficiency linear regulation in portable battery-powered equipment - emphasizing dropout minimization, reverse-fault resilience, and ceramic-capacitor compatibility without external compensation.
FAQ
What is the minimum input voltage required for LT3020IDD-1.5#PBF to regulate at full 100mA load?
The LT3020IDD-1.5#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 1.5V regulation. This is enabled by its PNP pass element and 150mV typical dropout - allowing operation from deeply discharged single-cell batteries.
Does LT3020IDD-1.5#PBF require an external capacitor on the SHDN pin?
No, the LT3020IDD-1.5#PBF does not require an external capacitor on the SHDN pin. The shutdown function is internally debounced and operates reliably with direct logic-level drive or open-drain interface. A pull-up resistor to VIN is recommended if driving from an open-collector source, but no bypass capacitor is specified or needed.
Can LT3020IDD-1.5#PBF be used with a 1µF output capacitor?
No - the LT3020IDD-1.5#PBF requires a minimum 2.2µF ceramic output capacitor with ESR ≤0.3Ω for guaranteed stability. Using 1µF risks oscillation and poor transient response, as confirmed in the datasheet's stability analysis and Typical Performance Characteristics curves.
How does the no-load recovery circuit in LT3020IDD-1.5#PBF improve system behavior?
The LT3020IDD-1.5#PBF's no-load recovery circuit activates when output voltage exceeds +6% of nominal (1.59V), sinking up to 15mA to rapidly discharge the output capacitor. This eliminates multi-millisecond undershoot/overshoot during load removal - critical for microcontroller wake-from-sleep sequences and sensor sampling accuracy.
Is LT3020IDD-1.5#PBF compatible with lead-free reflow processes?
Yes - LT3020IDD-1.5#PBF carries the #PBF suffix indicating lead-free (RoHS-compliant) packaging. It is qualified for standard Pb-free reflow profiles with peak temperature up to 260°C (per JEDEC J-STD-020), and its DFN package supports reliable solder joint formation under IPC-A-610 Class 2/3 requirements.
LT3020IDD-1.5#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):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.285V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- 3.5 mA
- PSRR:
- 58dB (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-1.5#PBF FAQ
1.How can I place an order for LT3020IDD-1.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3020IDD-1.5#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-1.5#PBF reliable?
The price and inventory of LT3020IDD-1.5#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-1.5#PBF is usually 5 days.
3.What payment methods are accepted for LT3020IDD-1.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3020IDD-1.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3020IDD-1.5#PBF?
LT3020IDD-1.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3020IDD-1.5#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-1.5#PBF?
For technical support, including LT3020IDD-1.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3020IDD-1.5#PBF requirements.
6.How does Aetrix verify that LT3020IDD-1.5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3020IDD-1.5#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-1.5#PBF meets industry standards.
7.What is the process for return or replacement of LT3020IDD-1.5#PBF?
All LT3020IDD-1.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3020IDD-1.5#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-1.5#PBF part is unused and in its original packaging.
Return procedure for LT3020IDD-1.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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