ADP3335ARMZ-3.3 - 500mA anyCAP LDO, 3.3V Fixed | Analog Devices
Teilenummer: ADP3335ARMZ-3.3 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.2 | $3,20 |
| 10 | $2.88 | $28,80 |
| 100 | $2.55 | $255,00 |
| 500 | $2.28 | $1.140,00 |
| 1.000 | $2.05 | $2.050,00 |
ADP3335ARMZ-3.3 Übersicht
What is an LDO? An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage, typically with a dropout of only a few hundred millivolts. LDOs belong to the broader category of linear regulators, which in turn sit under voltage regulators inside the power management IC hierarchy. Because they dissipate excess voltage as heat rather than switching it, LDOs introduce no switching noise, making them ideal for powering noise-sensitive analog and RF loads. The anyCAP architecture used by the ADP3335 family allows stable operation with any good-quality output capacitor - including low-ESR ceramic MLCC types - which simplifies board layout and shrinks the BOM in space-constrained designs.
Key features include an ultralow quiescent current that extends battery life in portable equipment, an ultralow dropout of 200 mV at 500 mA, integrated thermal shutdown and current-limit protection, and a noise performance optimized for wireless and instrumentation applications. The device is specified over the extended -40°C to +85°C (junction to +150°C) operating range, suiting industrial environments.
The ADP3335 uses an enhanced bipolar process and a precision bandgap reference that drives an internal PNP pass element. The anyCAP loop compensation removes the ESR-related stability constraints of legacy LDOs, allowing designers to use small 1 µF to 10 µF ceramic capacitors at the output without compromising phase margin. This combination of low noise, tight accuracy, and ceramic-cap stability is unusual for a 500 mA part and is a hallmark of the ADP33xx family.
Typical applications include wireless handsets, notebook and palmtop computers, PCMCIA cards, barcode scanners, low-noise analog circuits, and battery-powered instrumentation requiring a clean 3.3 V rail. The wide 2.6 V–12 V input range also supports 5 V and 9 V system buses, and the low dropout margin permits one-cell Li-ion discharge down to ~3.5 V before regulation is lost.
When designing with this part, place input and output capacitors as close to the IC as possible and ensure the PCB copper under the exposed pad (if present) provides adequate thermal relief - continuous 500 mA into a 5 V input from 12 V dissipates 4.35 W. The fixed -3.3 suffix means no external feedback resistors are required, reducing BOM cost and layout area versus adjustable LDOs.
Drop-in-Alternativen für ADP3335ARMZ-3.3 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ADP3335ARMZ-3.3-RL
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT1763-3.3
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADP3335ARMZ-3.3 Grenzwerte & elektrische Eigenschaften
| Regulator Type | Low-Dropout (LDO), Fixed Output |
| Ausgangsspannung | 3.3 V (fixed) |
| Eingangsspannungsbereich | 2.6 V to 12 V |
| Output Current (Continuous) | 500 mA |
| Dropout-Spannung | 200 mV (typical at 500 mA) |
| Initial Accuracy | ±0.9% (at 25°C) |
| Accuracy over Line/Load/Temp | ±1.8% |
| Output Capacitor Stability | anyCAP - stable with any good-quality capacitor including MLCC ceramic |
| Betriebstemperaturbereich | -40°C to +85°C (ambient), junction to +150°C |
| Gehäuse | 8-pin MSOP (RM suffix) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant (RM/MSOP package suffix indicates lead-free) |
| Protection Features | Thermal shutdown, current limit |
| Family | ADP3335 (anyCAP, 500 mA LDO) |
ADP3335ARMZ-3.3 Pin-Konfiguration
| Pin 1 | VIN — Input voltage supply (2.6 V to 12 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | ERR — Active-low error flag output (open-drain) |
| Pin 4 | SHDN — Shutdown input (active high) |
| Pin 5 | NR — Noise reduction / soft-start capacitor node |
| Pin 6 | ADJ/SENSE — On fixed -3.3 variants tied internally to VOUT feedback; on adjustable variants this is the feedback node |
| Pin 7 | VOUT — Regulated 3.3 V output |
| Pin 8 | VIN — Input voltage supply (tied to pin 1 for low-impedance) |
Typische Anwendungen
ADP3335ARMZ-3.3 ist geeignet für 6 Anwendungs: Wireless Handset Power Management, Notebook and Palmtop Computer 3.3V Rail, PCMCIA Card Local Regulation, Barcode Scanner and Portable Industrial Reader, Low-Noise Analog and Instrumentation Supply, Battery-Powered Portable Instrument 3.3V Rail.
Wireless Handset Power Management
The ADP3335ARMZ-3.3's anyCAP stability with ceramic MLCCs and 200 mV dropout at 500 mA make it ideal for 3.3 V rails in cellular handsets. With input tolerance up to 12 V, it can sit directly behind a single-cell Li-ion charger and survive transient spikes on the system bus. The ultralow quiescent current extends standby time, while the fixed 3.3 V output eliminates feedback resistors and reduces PCB area in densely packed RF modules. Placed between the battery/ChargerIC output and the baseband PMU, it delivers a clean rail that does not inject switching noise into the RF front end.
Empfohlen
Notebook and Palmtop Computer 3.3V Rail
The ADP3335ARMZ-3.3 provides a tightly regulated 3.3 V rail from the 5 V or 12 V system bus in notebook and palmtop computers. Its ±1.8% accuracy over line, load, and temperature keeps the rail within tolerance for low-voltage logic, PCMCIA cards, and memory subsystems without secondary regulation. The anyCAP loop is stable with the small 1 µF to 10 µF ceramic capacitors typical of compact motherboard designs, and the MSOP-8 footprint frees board space versus DPAK alternatives. Designers should budget thermal copper area for sustained loads above ~300 mA.
Empfohlen
PCMCIA Card Local Regulation
The ADP3335ARMZ-3.3 is well suited to PCMCIA cards that must derive a clean 3.3 V rail from the host system's bus. The wide 2.6 V–12 V input range handles the variable voltages supplied by PCMCIA sockets, while the 500 mA rating covers the card's full operating budget including RF and memory peaks. The anyCAP architecture allows the designer to use space-saving ceramic bypass capacitors right at the card edge connector, eliminating the bulky tantalum capacitors required by legacy LDOs. Fixed 3.3 V output also simplifies multi-card interoperability testing.
Empfohlen
Barcode Scanner and Portable Industrial Reader
Industrial barcode scanners benefit from the ADP3335ARMZ-3.3's extended -40°C to +85°C operating range and robust thermal protection. The 200 mV dropout at full load extends usable battery life in cold warehouses, while the fixed 3.3 V output powers the scanner's image sensor, processor, and wireless module directly. AnyCAP ceramic-cap stability is essential in shock- and vibration-prone handheld enclosures where electrolytic capacitors would be unreliable. The MSOP-8 footprint also fits inside pistol-grip scanner handles.
Empfohlen
Low-Noise Analog and Instrumentation Supply
The ADP3335ARMZ-3.3 is suitable for powering low-noise analog blocks such as sensor signal conditioners, precision ADCs, and DAC references in instrumentation equipment. The 200 mV dropout plus ultralow quiescent current keep efficiency reasonable when dropping from 5 V to 3.3 V, and the anyCAP architecture ensures stability with the small ceramic bypass caps common in mixed-signal layouts. While not the lowest-noise LDO in ADI's catalog, it provides a quiet-enough rail for 12-bit to 14-bit data-acquisition systems and is significantly cheaper than ultra-low-noise specialty parts.
Empfohlen
Battery-Powered Portable Instrument 3.3V Rail
The ADP3335ARMZ-3.3 fits portable battery-powered instruments - handheld multimeters, field data loggers, and medical monitors - that need a regulated 3.3 V rail from 1S Li-ion or 3×AA cells. Its ultralow quiescent current preserves shelf life between measurement campaigns, the 200 mV dropout maximizes runtime at end-of-discharge, and thermal shutdown protects against fault conditions when batteries age. The MSOP-8 package and ceramic-cap compatibility keep the BOM small and the layout compact, which is critical in handheld enclosures.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ADP3335ARMZ-3.3 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ADP3335ARMZ-3.3-RL | LT1763-3.3 | LT1763CS8-3.3 |
|---|---|---|---|---|
| Package | MSOP-8 | MSOP-8 - same | MSOP-8 - same | SOIC-8 - different |
| Brand | Analog Devices | Analog Devices | Analog Devices (formerly Linear Technology) | Analog Devices (formerly Linear Technology) |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed |
| Output Current | 500 mA | 500 mA | 500 mA | 500 mA |
| Input Voltage Range | 2.6 V to 12 V | 2.6 V to 12 V | 1.8 V to 20 V | 1.8 V to 20 V |
| Dropout Voltage (typ @ full load) | 200 mV | 200 mV | 300 mV | 300 mV |
| Capacitor Stability | anyCAP (ceramic OK) | anyCAP (ceramic OK) | anyCAP (ceramic OK) | anyCAP (ceramic OK) |
| Initial Accuracy | ±0.9% | ±0.9% | ±1% (typ), ±2% (max) | ±1% (typ), ±2% (max) |
Wichtigste Unterscheidungsmerkmale
- Wider input voltage range (12 V) than legacy LT1763 (20 V is wider, but ADP3335 is optimized for lower-VIN portable systems) (vs. LT1763-3.3)
- Identical silicon in tube and reel versions (vs. ADP3335ARMZ-3.3-RL)
- 8-pin MSOP package with anyCAP ceramic-cap stability (vs. MIC5205-3.3BMM)
Designhinweise
Estimated: At VIN=12 V, VOUT=3.3 V, IOUT=500 mA, power dissipation is (12 - 3.3) × 0.5 = 4.35 W. The MSOP-8 package's theta_JA is approximately 150 °C/W on a 1 oz 4-layer board, giving a junction rise of ~650 °C above ambient - far exceeding the 150 °C TJ limit. Designers must keep VIN-VOUT × IOUT below ~1 W or provide substantial copper area under the exposed pad; for sustained 500 mA from 5 V to 12 V inputs, consider an ADP3336 in a larger package instead. Always re-verify against your specific PCB layout's measured thermal performance.
Place the input capacitor (≥1 µF X7R/X5R ceramic) within 5 mm of the VIN pin and the output capacitor (≥1 µF X7R/X5R ceramic, ESR < 1 Ω) within 5 mm of the VOUT pin. The anyCAP loop is stable with any good-quality capacitor including small MLCCs, but trace inductance between the cap and the IC ground reference must be minimized. Route the GND pin directly to a low-impedance ground plane via a short trace or via-in-pad.
Do not leave the SHDN pin floating - it has an internal pull-down but tying it explicitly to VIN or a logic GPIO prevents unexpected shutdowns at power-up. On the adjustable variant, ensure the feedback resistors are 1% or better to maintain the specified ±1.8% accuracy; on the fixed -3.3 variant the feedback is internal, so no resistors are needed. The ERR pin is open-drain and requires an external pull-up to a logic rail; do not leave it floating if your system monitors regulator health.
Compliance-Informationen
MSOP package suffix indicates lead-free / RoHS-compliant finish. Not AEC-Q100 qualified; not recommended for automotive safety-critical applications. Halogen-free status not explicitly stated in provided data.
