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Analog Devices Inc./Maxim Integrated MAX6470UT33BD3
- Part No.:
- MAX6470UT33BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6470UT33BD3.pdf
- Description:
- FIXED/ADJUSTABLE POSITIVE LDO RE
- Quantity:
- Payment:
- Shipping:
Inventory:1,035
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Product details
Overview
MAX6470UT33BD3 from Maxim Integrated is a 300mA, 3.3V fixed-output low-dropout linear regulator with integrated microprocessor reset circuit, 82µA quiescent current, ±2.0% output voltage accuracy over -40°C to +85°C, and 150ms minimum reset timeout. It delivers stable power and reliable system initialization for portable battery-powered microprocessor systems.
For engineers reviewing the MAX6470UT33BD3 datasheet, MAX6470UT33BD3 pinout, MAX6470UT33BD3 application, or MAX6470UT33BD3 equivalent, key selection considerations include its 150ms reset timeout, active-low open-drain RESET output, shutdown current of 0.1µA (typ), SOT23-6 package, and compatibility with 3.3V logic supply rails in space-constrained portable designs.
Technical Context
The MAX6470UT33BD3 integrates a precision LDO regulator core with a dedicated reset supervisor using a shared bandgap reference. Its reset threshold is -7.5% of nominal VOUT (i.e., 3.0525V for 3.3V output), with guaranteed assertion before VOUT drops to 2.9325V. The device employs an internal P-channel pass transistor enabling 55mV dropout at 150mA and 114mV at 300mA under 3.3V output conditions.
It features active-low SHDN control with TTL/CMOS-compatible thresholds (VIL ≤ 0.3×VIN, VIH ≥ 0.7×VIN), reverse current protection (<0.01µA OUT-to-IN leakage), thermal shutdown at +180°C with 20°C hysteresis, and short-circuit current limiting (450mA min). No external components are required for basic operation beyond input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.0% over full temperature range - ensures stable logic rail for 3.3V microcontrollers without trimming. |
| Max Output Current | 300mA guaranteed - supports moderate-power peripherals like Bluetooth modules or USB transceivers. |
| Dropout Voltage | 114mV at 300mA - enables operation down to VIN = 3.414V, critical for single-cell Li-ion or 3× alkaline battery systems. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring circuits such as handheld instruments. |
| Reset Timeout | 150ms minimum - satisfies boot timing requirements for ARM Cortex-M and similar MCUs requiring >100ms stabilization. |
| Reset Threshold | -7.5% of VOUT (3.0525V) - triggers reset before processor supply violation, preventing erratic execution during brownout. |
| Shutdown Current | 0.1µA typical - reduces standby power to negligible levels in sleep-mode applications like PDAs or digital cameras. |
Pinout & Package
MAX6470UT33BD3 is housed in a 6-pin SOT23-6 package with exposed paddle (EP) internally connected to GND. Thermal performance is optimized by soldering EP to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 2.5V–5.5V input; requires 0.1µF bypass capacitor to GND for stability and noise rejection. |
| 2 (GND) | Ground / Thermal Pad | Primary electrical return and thermal dissipation path; must be connected to large copper area for safe 300mA operation. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulled high to IN for normal operation; drives regulator into 0.1µA sleep mode when pulled low. |
| 4 (RESET) | Active-Low Open-Drain Reset Output | Sinks up to 3.2mA; requires external pullup to VCC for µP reset signaling; asserts during power-up, brownout, or SHDN activation. |
| 5 (SET) | Feedback Configuration Pin | Internally tied to GND for fixed 3.3V output; floating or externally biased for adjustable mode (not used in this variant). |
| 6 (OUT) | Regulated Output | Delivers 3.3V @ 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Microprocessor Reset | Eliminates need for discrete supervisor IC; guarantees reset assertion before VOUT falls outside ±7.5% tolerance. |
| Ultra-Low Quiescent Current | 82µA operating / 0.1µA shutdown - enables multi-year battery life in coin-cell–powered IoT sensors. |
| Reverse Current Protection | <0.01µA OUT-to-IN leakage - prevents backup capacitor or supercap discharge into depleted main battery. |
| Thermal & Short-Circuit Protection | Auto-recovering shutdown at +180°C and 450mA current limit - ensures robustness in unattended embedded deployments. |
| Low-Noise Operation | Not applicable to MAX6470UT33BD3 (UCSP variants only); SOT23 version meets standard 150µVRMS noise spec for digital loads. |
Applications
| Handheld Instruments | PCMCIA/USB Devices |
|---|---|
Use Scenario: Power management in palm-sized test meters with LCD display and analog front-end. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying MCU, ADC, and display driver; RESET ensures clean boot after battery insertion or wake-from-sleep. Use Value: 150ms reset timeout aligns with LCD controller initialization sequence; 114mV dropout preserves runtime as battery discharges from 4.2V to 3.4V. | Use Scenario: Compact USB peripheral card requiring regulated 3.3V from host bus power or local battery. IC Role / Device Role / Timing Role: Local regulation and power-good signaling for FPGA configuration and USB PHY interface. Use Value: Open-drain RESET interfaces directly with USB controller's nRESET pin; SHDN enables dynamic power gating during USB suspend. |
| Cellular Telephones | Digital Cameras |
Use Scenario: Baseband processor power rail in dual-SIM feature phone with intermittent RF transmission. IC Role / Device Role / Timing Role: Main 3.3V supply for application processor and memory; RESET synchronizes with PMIC sequencing during cold boot. Use Value: 82µA IQ minimizes idle current draw between voice calls; thermal shutdown protects against RF amplifier heat coupling. | Use Scenario: Image sensor and ISP power domain in compact point-and-shoot camera with flash LED. IC Role / Device Role / Timing Role: Dedicated 3.3V rail for CMOS image sensor and JPEG encoder ASIC; RESET validates stable voltage before frame capture. Use Value: 300mA output supports burst-mode sensor readout; 150ms timeout accommodates flash capacitor recharge delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76333DBVR | 300mA LDO with 120ms reset timeout, no shutdown pin, fixed 3.3V, 120µA IQ | Lacks SHDN control; reset is push-pull not open-drain; no manual reset option | Select when board layout prohibits SHDN routing and open-drain flexibility is unnecessary. |
| NCP1117ST33T3G | 800mA LDO with no integrated reset; requires external supervisor (e.g., MCP102) | Higher current capability but adds BOM cost, footprint, and design complexity | Select only if >300mA load demand exists and discrete reset implementation is acceptable. |
Compared with TPS76333DBVR and NCP1117ST33T3G, MAX6470UT33BD3 uniquely combines 300mA delivery, 0.1µA shutdown, 150ms open-drain reset, and SOT23-6 integration-enabling smaller footprint and lower system-level power in portable 3.3V applications.
Availability
MAX6470UT33BD3 is available at Aetrix Electronics and suitable for handheld instruments, PCMCIA/USB devices, and cellular telephones requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX6470UT33BD3 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable electronics needing tightly regulated voltage rails combined with reliable, integrated power-on reset functionality in minimal footprint packages.
FAQ
What is the exact reset threshold voltage for MAX6470UT33BD3?
The MAX6470UT33BD3 has a -7.5% reset threshold relative to its nominal 3.3V output, resulting in a guaranteed reset assertion when VOUT falls below 3.0525V and before it reaches 2.9325V. This threshold is factory-trimmed and specified across -40°C to +85°C, ensuring consistent microprocessor initialization behavior regardless of temperature drift or load variation. The MAX6470UT33BD3 uses the same precision bandgap reference for both regulation and reset detection.
Does MAX6470UT33BD3 support adjustable output voltage?
No, MAX6470UT33BD3 is a fixed 3.3V output variant. Its SET pin is internally configured for preset operation and must be connected to GND per datasheet guidance; external resistor dividers are not supported. Adjustable output is only available on MAX6469–MAX6472/MAX6477–MAX6480 variants where SET is explicitly designed for feedback network interfacing. Using MAX6470UT33BD3 in adjustable mode would violate specification and yield undefined output voltage.
What package type and pin count does MAX6470UT33BD3 use?
MAX6470UT33BD3 uses a 6-pin SOT23-6 package with exposed thermal pad (EP), as confirmed by Maxim's Ordering Information table and Pin Configurations section. The "UT" suffix in the part number explicitly denotes SOT23-6 packaging, distinguishing it from "TA" (TDFN-8) and "UCSP" variants. All electrical and thermal specifications in the datasheet for MAX6470UTxxx variants are validated for this SOT23-6 footprint.
Can MAX6470UT33BD3 be used with a 2.5V input supply?
Yes, MAX6470UT33BD3 operates with input voltages from 2.5V to 5.5V, but at 2.5V input it cannot regulate 3.3V output due to insufficient headroom. With 3.3V VOUT and 114mV dropout at 300mA, minimum functional VIN is 3.414V. At 2.5V input, the device enters dropout, delivering unregulated output near VIN minus losses. For 2.5V systems, select a 2.5V-output variant (e.g., MAX6470UT25BD3) or verify actual load current is low enough to maintain <55mV dropout.
Is the RESET output of MAX6470UT33BD3 push-pull or open-drain?
The MAX6470UT33BD3 features an open-drain active-low RESET output, as indicated by the "D3" suffix (per Reset Timeout Delay Guide Table 3) and confirmed in the Pin Description table. It sinks up to 3.2mA when asserted and requires an external pullup resistor to the monitored VCC rail. This configuration allows wired-OR reset bus sharing across multiple supervisors and compatibility with µP reset inputs expecting open-drain signaling.
MAX6470UT33BD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V (3.3V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.18V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6470UT33BD3 FAQ
1.How can I place an order for MAX6470UT33BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6470UT33BD3 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 MAX6470UT33BD3 reliable?
The price and inventory of MAX6470UT33BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6470UT33BD3 is usually 5 days.
3.What payment methods are accepted for MAX6470UT33BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6470UT33BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6470UT33BD3?
MAX6470UT33BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6470UT33BD3 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 MAX6470UT33BD3?
For technical support, including MAX6470UT33BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6470UT33BD3 requirements.
6.How does Aetrix verify that MAX6470UT33BD3 is sourced from the original manufacturer or authorized distributors?
All MAX6470UT33BD3 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 MAX6470UT33BD3 meets industry standards.
7.What is the process for return or replacement of MAX6470UT33BD3?
All MAX6470UT33BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6470UT33BD3, 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 MAX6470UT33BD3 part is unused and in its original packaging.
Return procedure for MAX6470UT33BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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