My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1947ETA25
- Part No.:
- MAX1947ETA25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1947ETA25.pdf
- Description:
- IC REG BOOST 2.5V 380MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:597
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1947ETA25 from Maxim Integrated is a fixed-output 2.5V, high-efficiency step-up DC-DC converter optimized for single- and dual-cell alkaline/NiMH/NiCd battery-powered systems. It features an internal 800mA n-channel switch, synchronous p-channel rectifier, 70µA typical operating supply current (measured at OUT), and a 75ms active-low RESET output. It powers µP/DSP cores and I/O rails in portable medical devices and wireless peripherals.
For engineers reviewing the MAX1947ETA25 datasheet, MAX1947ETA25 pinout, MAX1947ETA25 application, or MAX1947ETA25 equivalent, key selection criteria include its 0.7V minimum input voltage, 2.5V ±3% output regulation at 32mA load, True Shutdown™ delivering 2µA shutdown current with active output discharge, and TDFN-8 3mm × 3mm package compatibility with ceramic-only external components.
Technical Context
The MAX1947ETA25 employs a bootstrapped startup oscillator and a unique minimum-off-time, current-limited control scheme combining PWM efficiency with pulse-skipping quiescent current reduction. Its architecture enables up to 2MHz switching frequency and automatic pulse skipping at light loads.
It integrates both NFET (800mA current limit, 0.35Ω typical on-resistance at 100mA) and PFET (75mA turn-off current, 0.7Ω typical on-resistance) power switches, with synchronous rectification eliminating external Schottky diodes. The device enters track mode when BATT exceeds VOUT, enabling direct battery-to-rail tracking without regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±3% at 32mA load - eliminates feedback network and simplifies layout |
| Input Voltage Range | 0.7V to 3.6V - supports operation down to near-dead alkaline/NiMH cells |
| Efficiency | Up to 94% - achieved via synchronous rectification and low RDS(ON) switches |
| Operating Supply Current | 70µA typical (measured at OUT) - extends battery life in standby modes |
| Shutdown Current | 2µA logic-controlled - enabled by True Shutdown™ with active output discharge to ground |
| RESET Output | Active-low push-pull with 75ms timeout after VOUT reaches 90% of regulation - provides reliable POR and undervoltage detection |
| Switching Frequency | Up to 2MHz - allows use of small 4.7µH inductor and low-ESR ceramic capacitors |
Pinout & Package
MAX1947ETA25 is housed in an 8-pin TDFN package (3mm × 3mm, 0.8mm height) with exposed paddle (EP) connected to GND/PGND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset flag | Signals microcontroller when VOUT ≥ 90% of 2.5V; held low during shutdown |
| 2,3 - GND | Signal ground reference | Must be connected to exposed paddle; forms low-impedance return path for control circuitry |
| 4 - SHDN | Logic-controlled shutdown enable | Drive low to enter 2µA shutdown with active VOUT discharge; drive high or to BATT for normal operation |
| 5 - PGND | Power ground return | Carries high-current LX switching return; must connect directly to exposed paddle |
| 6 - LX | Switch node connection | Drives external inductor; connects internally to drains of NFET and PFET switches |
| 7 - OUT | Regulated 2.5V output | Bypassed with 10µF ceramic capacitor for full-load stability; supports ≤4.7µF at <50% load |
| 8 - BATT | Battery input supply | Powers startup oscillator and chip when VOUT < VBATT; enables track mode when VBATT > 2.5V |
| EP - Exposed Paddle | Thermal & electrical ground | Must be soldered to PCB ground plane for thermal dissipation and noise reduction |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 2µA shutdown current with active 500Ω output discharge to ground - prevents floating rail and ensures clean system reset |
| Synchronous Rectification | Integrated PFET replaces external Schottky diode - reduces board area, cost, and conduction losses |
| Low-Input-Voltage Startup | Starts from 0.8V (typ) and operates down to 0.7V - enables use with deeply discharged primary batteries |
| Ceramic-Capacitor Optimized | Designed for 2.2µF input and 4.7–10µF X5R/X7R ceramic capacitors - eliminates electrolytics and improves reliability |
| Track Mode Operation | Automatically tracks VBATT when >2.5V - maintains regulated output without switching loss during high-battery conditions |
Applications
| Portable Medical Sensors | Wireless Keyboard/Mouse |
|---|---|
|
Use Scenario: Powering low-power MCU and analog front-end in battery-operated glucose monitors or pulse oximeters. IC Role / Device Role / Timing Role: Step-up regulator providing stable 2.5V rail from single 1.5V alkaline cell under variable load. Use Value: 0.7V minimum input enables >90% battery utilization; 70µA quiescent current extends operational life between calibrations. |
Use Scenario: Supplying 2.5V to RF transceiver and microcontroller in ultra-low-power human interface devices. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated voltage while supporting burst-mode transmission. Use Value: 2MHz switching minimizes output ripple (<10mVP-P) critical for RF signal integrity; True Shutdown™ ensures zero leakage during sleep. |
| Digital Still Cameras | PDAs and Handheld Organizers |
|
Use Scenario: Generating 2.5V for image sensor bias and memory interface in compact camera modules. IC Role / Device Role / Timing Role: High-efficiency boost converter powering mixed-signal subsystems during short-duration capture bursts. Use Value: 94% peak efficiency reduces thermal load in sealed enclosures; 75ms RESET ensures clean processor initialization after cold start. |
Use Scenario: Providing core voltage to ARM-based application processors and NAND flash in legacy PDA platforms. IC Role / Device Role / Timing Role: Fixed-output DC-DC regulator replacing linear solutions to improve battery runtime. Use Value: Eliminates external feedback resistors and compensation network - reduces BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61022DRCT | 2.5V fixed output, 0.9V min input, 92% max efficiency, no integrated RESET | Lacks dedicated 75ms RESET output; requires external supervisor for POR | Preferred where RESET functionality is handled elsewhere and lower input voltage (0.9V vs. 0.7V) is acceptable |
| LT1949EMS8-2.5#TRPBF | 2.5V fixed output, 1.0V min input, 88% max efficiency, 1.2MHz switching | No True Shutdown™ - 1µA shutdown but no active output discharge; no track mode | Selected when board space permits larger inductor and RESET is not required |
Compared with MAX1947ETA25, the TPS61022DRCT offers higher integration density but omits the critical RESET function, while the LT1949EMS8-2.5#TRPBF trades efficiency and input-voltage capability for simpler control architecture - neither matches MAX1947ETA25's combination of ultra-low startup voltage, integrated RESET, and True Shutdown™ discharge.
Availability
MAX1947ETA25 is available at Aetrix Electronics and suitable for portable medical equipment, wireless peripherals, digital still cameras, and handheld organizers requiring stable component supply across extended production lifecycles.
Supply support for MAX1947ETA25 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and portable applications.
The MAX1947 series was developed specifically for ultra-low-voltage battery-powered systems needing high-efficiency, fixed-output step-up conversion with integrated power-on reset and true shutdown - targeting MP3 players, PDAs, and portable instrumentation.
FAQ
What is the minimum input voltage required for MAX1947ETA25 to start up and regulate?
The MAX1947ETA25 starts up from as low as 0.8V (typical) and operates continuously down to 0.7V input voltage. This enables reliable operation with nearly depleted alkaline or NiMH cells. Startup voltage varies slightly with temperature and load, with a typical temperature coefficient of -2.1mV/°C. The device remains functional across the full -40°C to +85°C operating range.
Does MAX1947ETA25 require external feedback resistors to set its output voltage?
No, MAX1947ETA25 does not require external feedback resistors. It is a fixed-output converter delivering 2.5V ±3% at 32mA load, with internal regulation circuitry eliminating the need for external compensation or feedback networks. This simplifies design, reduces BOM count, and improves long-term output stability versus resistor-tolerance drift.
How does the RESET output of MAX1947ETA25 behave during power-up and shutdown?
The RESET output of MAX1947ETA25 is an active-low push-pull signal that stays low until VOUT reaches 90% of 2.5V (i.e., 2.25V), then initiates a 75ms (minimum) timer before going high. During shutdown (SHDN = GND), RESET is actively driven low. It remains valid for output voltages as low as 0.9V, ensuring robust power-on reset signaling even under marginal conditions.
What is the purpose of the True Shutdown™ feature in MAX1947ETA25?
True Shutdown™ in MAX1947ETA25 disconnects the output from the input path and actively discharges the 2.5V rail to ground through an internal 500Ω resistor. This eliminates floating outputs and ensures clean system reset - unlike conventional shutdown modes that leave VOUT charged. Shutdown current is reduced to just 2µA, making it ideal for battery-critical applications.
Can MAX1947ETA25 operate in track mode, and what triggers it?
Yes, MAX1947ETA25 enters track mode when three conditions are met: BATT voltage exceeds the 2.5V output regulation point, VOUT is already above 2.5V, and the minimum off-time expires. In this mode, the synchronous rectifier conducts 100% of the time, allowing VOUT to closely follow VBATT - reducing switching losses and improving efficiency during high-battery conditions.
MAX1947ETA25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 380mA
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX1947ETA25 FAQ
1.How can I place an order for MAX1947ETA25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1947ETA25 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 MAX1947ETA25 reliable?
The price and inventory of MAX1947ETA25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1947ETA25 is usually 5 days.
3.What payment methods are accepted for MAX1947ETA25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1947ETA25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1947ETA25?
MAX1947ETA25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1947ETA25 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 MAX1947ETA25?
For technical support, including MAX1947ETA25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1947ETA25 requirements.
6.How does Aetrix verify that MAX1947ETA25 is sourced from the original manufacturer or authorized distributors?
All MAX1947ETA25 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 MAX1947ETA25 meets industry standards.
7.What is the process for return or replacement of MAX1947ETA25?
All MAX1947ETA25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1947ETA25, 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 MAX1947ETA25 part is unused and in its original packaging.
Return procedure for MAX1947ETA25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1947ETA25 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
