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Analog Devices Inc./Maxim Integrated MAX1793EUE25
- Part No.:
- MAX1793EUE25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX1793EUE25.pdf
- Description:
- IC REG LINEAR LDO 1A LOW IQ
- Quantity:
- Payment:
- Shipping:
Inventory:380
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Product details
Overview
MAX1793EUE25 from Maxim Integrated is a low-dropout linear regulator (LDO) with fixed 2.5V output, delivering guaranteed 1A load current from +2.5V to +5.5V input, featuring ±1% output voltage accuracy, 270mV dropout at 1A, and integrated reset output with 4ms delay. It serves as a primary power rail regulator in portable battery-powered systems requiring stable low-noise voltage under varying load and input conditions.
For engineers reviewing the MAX1793EUE25 datasheet, MAX1793EUE25 pinout, MAX1793EUE25 application, or MAX1793EUE25 equivalent, key selection criteria include dropout performance at full load, ground current in active and shutdown modes (125µA / 0.1µA), output noise (115µVRMS), thermal protection behavior, and Dual Mode™ configurability between preset and adjustable operation.
Technical Context
The MAX1793EUE25 employs an internal p-channel MOSFET pass transistor enabling low quiescent current (125µA at 100µA load) and stable dropout behavior across temperature and load. Its Dual Mode™ architecture uses the SET pin to select between factory-trimmed 2.5V output (SET = GND) or adjustable mode (1.25V–5.0V) via external resistor divider.
It integrates a precision 1.25V reference, error amplifier, MOSFET driver, and low-VOUT comparator that triggers the open-drain RST output when VOUT falls below 94% of nominal (2.35V for 2.5V version), holding low for ≥4ms after recovery. Thermal shutdown activates at +170°C with ~20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1% over -40°C to +85°C, 1mA–1A load, VIN ≥ 3.0V - ensures stable logic supply for 2.5V I/O domains. |
| Dropout Voltage | 270mV (max) at 1A load - enables operation down to VIN = 2.77V, extending usable battery life in single-cell Li-ion or multi-cell alkaline systems. |
| Ground Current | 125µA typical at 100µA load - minimizes standby power loss in always-on subsystems like RTC or sensor interfaces. |
| Shutdown Current | 0.1µA max at VIN = 5.5V - supports ultra-low-power sleep states in portable devices without compromising wake-up integrity. |
| Output Noise | 115µVRMS (10Hz–1MHz) with 6.8µF ceramic COUT - suitable for noise-sensitive analog rails (e.g., ADC references, RF bias) without additional filtering. |
| Reset Threshold | 94% of nominal VOUT (2.35V) with 4ms release delay - provides reliable power-on-reset timing for microcontrollers and FPGAs during brown-out recovery. |
| Thermal Shutdown | Activates at +170°C junction temperature with ~20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
The MAX1793EUE25 is housed in a 16-pin TSSOP-EP package with exposed thermal pad (EP), rated for 1.5W continuous power dissipation at +70°C ambient. The package is 30% smaller than SOT223 and only 1.1mm high, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | N.C. | No internal connection - must remain unconnected; floating or tied to GND has no functional impact. |
| 2–5 | IN | Main input supply pins (internally paralleled) - require 4.7µF bypass capacitor per IN pin group to minimize source impedance and improve transient response. |
| 6 | RST | Open-drain reset output - sinks current when VOUT < 2.35V; requires external 100kΩ pullup to OUT or another logic rail for clean POR signaling. |
| 7 | SHDN | Active-low shutdown control - logic low disables regulation, pulls OUT low via 5kΩ internal resistor, and reduces IQ to 0.1µA. |
| 10 | GND | Power and signal ground reference - also functions as thermal path; must be soldered to large PCB ground plane for thermal management. |
| 11 | SET | Voltage-setting input - grounded for 2.5V preset mode; connected to resistor divider for adjustable operation; dual-mode threshold is 50–150mV. |
| 12–15 | OUT | Regulated output terminals (internally paralleled) - require 6.8µF low-ESR (<0.5Ω) capacitor to GND for stability and low noise. |
| EP | Exposed Pad | Thermal and electrical ground - must be soldered to PCB ground plane using multiple vias to achieve θJA < 40°C/W and sustain 1A continuous operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Selection | Single SET pin selects between factory-trimmed 2.5V output or 1.25V–5.0V adjustable range - eliminates need for separate fixed/adjustable SKUs and simplifies BOM management. |
| p-Channel MOSFET Pass Device | Enables 125µA ground current at light loads and maintains low dropout without base-drive current - avoids efficiency loss and thermal penalty seen in PNP-based LDOs. |
| Integrated 4ms Reset Generator | Monitors VOUT continuously and asserts open-drain RST within microseconds of undervoltage detection - replaces discrete supervisor ICs in compact portable designs. |
| Robust Protection Suite | Combines short-circuit current limit (1.1–3.3A), thermal shutdown (+170°C), and undervoltage lockout (2.0–2.3V) - allows safe operation under fault conditions without external circuitry. |
| TSSOP-EP Thermal Packaging | 1.5W power rating with exposed pad and GND pin as dual thermal paths - achieves >30% higher power density vs. SOT223 while maintaining 1.1mm profile for thin end-products. |
Applications
| Cellular Phone Baseband Power | Notebook Computer I/O Rail |
|---|---|
|
Use Scenario: Powers 2.5V baseband processor core and memory interface in GSM/UMTS handsets operating from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.5V at up to 1A with fast load-transient response to handle burst-mode transmission current spikes. Use Value: 270mV dropout extends usable battery voltage down to 2.77V, increasing talk time by ~8% versus higher-dropout alternatives; 115µVRMS noise prevents digital switching noise from corrupting sensitive RF receive paths. |
Use Scenario: Supplies 2.5V I/O voltage for USB 2.0 transceivers and PCIe clock buffers in ultrabook platforms with tight thermal envelopes. IC Role / Device Role / Timing Role: Low-noise, thermally robust LDO placed near high-speed interface ICs to maintain signal integrity and meet PCIe jitter specifications. Use Value: TSSOP-EP package with exposed pad enables 1.5W dissipation on 2-layer PCBs without heatsinks; 4ms RST output synchronizes USB controller reset with power rail stabilization. |
| Handheld Instrument Analog Front-End | PDA System-on-Chip Core Supply |
|
Use Scenario: Provides clean 2.5V reference rail for 16-bit SAR ADC and programmable gain amplifier in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Precision LDO with ±1% output accuracy and low 115µVRMS noise serving as analog domain power source independent of digital supply fluctuations. Use Value: Ground current remains ≤200µA across 100µA–1A load range - preserves battery life during long-duration measurement cycles while maintaining ADC LSB accuracy. |
Use Scenario: Delivers 2.5V core voltage to ARM9-based SoC in legacy PDAs with aggressive size constraints and intermittent high-current bursts. IC Role / Device Role / Timing Role: High-current LDO with integrated shutdown and reset, controlled by PMIC sequencer to coordinate power-up/down of CPU, memory, and display subsystems. Use Value: 0.1µA shutdown current enables weeks of standby time; RST output provides hardware reset to SoC upon power rail validation, eliminating firmware-level POR delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76325QDBVRQ1 | Fixed 2.5V output, 150mA max current, 120mV dropout at 150mA, 1.2µA IQ - lacks reset output and thermal shutdown. | Suitable only for low-current auxiliary rails; cannot replace MAX1793EUE25 in 1A main power roles. | Select only for non-critical, low-power subsystems where reset supervision and thermal protection are handled externally. |
| MCP1825-2502E/DB | Fixed 2.5V output, 500mA max current, 350mV dropout at 500mA, 95µA IQ, no reset output - uses NPN pass transistor, higher ground current under load. | Acceptable for moderate-load applications but insufficient for 1A peak demands; no built-in reset simplifies design but removes fault visibility. | Consider only when board space permits larger package and system-level reset generation is already implemented. |
Compared with TPS76325QDBVRQ1 and MCP1825-2502E/DB, the MAX1793EUE25 uniquely combines 1A capability, integrated reset with programmable delay, thermal shutdown, and ultra-low 125µA ground current - making it the sole option among these three for space-constrained, high-reliability 2.5V main rail applications in portable electronics.
Availability
MAX1793EUE25 is available at Aetrix Electronics and suitable for notebook computers, cellular phones, handheld instruments, and PDAs requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX1793EUE25 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 solutions for industrial, communications, and consumer applications.
The MAX1793 series belongs to Maxim's low-dropout linear regulator product line, designed specifically for battery-powered portable equipment demanding high output accuracy, low quiescent current, and integrated system supervision features.
FAQ
What is the maximum input voltage rating for the MAX1793EUE25?
The MAX1793EUE25 has an absolute maximum input voltage rating of +6V referenced to GND. However, its operational input voltage range is specified from +2.5V to +5.5V. Exceeding +5.5V may cause permanent damage or violate safety margins defined in the Absolute Maximum Ratings table. For reliable long-term operation, keep VIN ≤ +5.5V and ensure proper input capacitance (4.7µF minimum) to suppress transients.
Does the MAX1793EUE25 require external components to operate in fixed 2.5V mode?
Yes - the MAX1793EUE25 requires two external capacitors for stable operation in fixed 2.5V mode: a 4.7µF capacitor between each IN pin group and GND (pins 2–5), and a 6.8µF low-ESR (<0.5Ω) capacitor between all OUT pins (12–15) and GND. Additionally, the SET pin (pin 11) must be connected directly to GND to enable preset mode; failure to do so may cause unstable regulation or incorrect output voltage.
How does the RST output behave during shutdown of the MAX1793EUE25?
During shutdown (SHDN = GND), the RST output of the MAX1793EUE25 is actively driven low regardless of VOUT level. This behavior is specified in the Pin Description section and confirmed in the Typical Operating Characteristics plots. The RST pin remains low until SHDN returns high and VOUT rises above 94% of 2.5V (2.35V), after which the 4ms release delay begins. This ensures synchronized reset assertion during power-down sequences.
Can the MAX1793EUE25 be used with ceramic output capacitors?
Yes - the MAX1793EUE25 is explicitly designed for use with ceramic output capacitors. The datasheet specifies a 6.8µF ceramic capacitor with ESR < 0.5Ω as the recommended COUT. Ceramic capacitors provide optimal transient response and low noise performance due to their minimal ESR and ESL. Avoid tantalum or aluminum electrolytic types unless ESR is verified ≤0.5Ω, as higher ESR may degrade stability and increase output ripple.
What thermal design considerations apply to the MAX1793EUE25 in a 1A application?
At 1A load with 2.77V input (270mV dropout), the MAX1793EUE25 dissipates ~270mW. To maintain TJ < +150°C, the PCB must provide adequate thermal conduction: the exposed pad (EP) and GND pin (pin 10) must be soldered to a minimum 1in² copper area or connected via ≥4 thermal vias to an internal ground plane. Without this, junction temperature rise may exceed limits, triggering thermal shutdown. Refer to Figure 4 in the datasheet for derating curves at elevated ambient temperatures.
MAX1793EUE25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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):
- 1.25V (2.5V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.45V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX1793EUE25 FAQ
1.How can I place an order for MAX1793EUE25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1793EUE25 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 MAX1793EUE25 reliable?
The price and inventory of MAX1793EUE25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1793EUE25 is usually 5 days.
3.What payment methods are accepted for MAX1793EUE25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1793EUE25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1793EUE25?
MAX1793EUE25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1793EUE25 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 MAX1793EUE25?
For technical support, including MAX1793EUE25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1793EUE25 requirements.
6.How does Aetrix verify that MAX1793EUE25 is sourced from the original manufacturer or authorized distributors?
All MAX1793EUE25 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 MAX1793EUE25 meets industry standards.
7.What is the process for return or replacement of MAX1793EUE25?
All MAX1793EUE25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1793EUE25, 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 MAX1793EUE25 part is unused and in its original packaging.
Return procedure for MAX1793EUE25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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