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Analog Devices Inc./Maxim Integrated MAX1795EUA
- Part No.:
- MAX1795EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1795EUA.pdf
- Description:
- IC REG BOOST ADJ 200MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,452
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Product details
Overview
MAX1795EUA from Maxim Integrated is a high-efficiency, step-up DC-DC converter optimized for low-input-voltage portable devices. It delivers up to 180mA output current at 3.3V (or 120mA at 5V) from inputs as low as 0.7V, features True Shutdown™ with 2μA shutdown current, and integrates synchronous rectification to eliminate external Schottky diodes-enabling compact power solutions in digital audio players and wireless handsets.
For engineers reviewing the MAX1795EUA datasheet, MAX1795EUA pinout, MAX1795EUA application, or MAX1795EUA equivalent, key selection criteria include its 0.25A current limit, 8-pin μMAX package (1.09mm height), 25μA quiescent current, LX-damping for EMI reduction, and LBI/LBO comparator active during shutdown-critical for battery monitoring in space-constrained, ultra-low-power systems.
Technical Context
The MAX1795EUA employs a minimum-off-time, current-limited control scheme combining PWM efficiency with pulse-skipping quiescent current benefits, enabling up to 95% efficiency across load ranges. Its internal N-channel MOSFET (RDS(ON) = 0.17Ω typ) and P-channel synchronous rectifier replace external diodes while minimizing conduction loss.
True Shutdown™ fully disconnects OUT from BATT, placing OUT in high-impedance state and reducing supply current to <2μA; simultaneously, the LBI/LBO comparator remains functional for battery monitoring. The integrated LX-damping switch (RDAMP = 100–400Ω) suppresses inductor ringing without affecting output ripple-reducing EMI in noise-sensitive RF sections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 3.3V (FB→OUT) or 5.0V (FB→GND); adjustable 2.0–5.5V via resistor divider |
| Input Voltage Range | +0.7V to +5.5V; guaranteed startup from +0.85V-supports single-cell alkaline/NiMH operation |
| Max Output Current | 180mA @ 3.3V / 120mA @ 5.0V (VBATT = +2V); limited by 0.25A NFET switch current |
| Quiescent Current | 25μA operating; 2μA in shutdown-enables multi-week standby in portable devices |
| Efficiency | Up to 95% at mid-load; maintained >85% down to 10mA due to synchronous rectification |
| Package | 8-pin μMAX (3.0mm × 3.0mm × 1.09mm); half-size vs. SO-8, ideal for ultra-thin handheld PCBs |
| LX Damping | Integrated damping switch reduces EMI without increasing output ripple or requiring external components |
Pinout & Package
MAX1795EUA is housed in an 8-pin μMAX package (3.0mm × 3.0mm × 1.09mm), surface-mount, exposed-pad-less, RoHS-compliant package optimized for thermal performance in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LBI | Low-battery comparator input | Monitors battery voltage; trips at 0.85V (±25mV hysteresis); remains active in shutdown |
| 2 - FB | Feedback input | Selects preset 3.3V (connected to OUT) or 5.0V (connected to GND); enables adjustable output via resistor divider |
| 3 - LBO | Open-drain low-battery output | Sinks current when LBI > 0.85V; high-impedance otherwise; usable up to 6V regardless of VOUT |
| 4 - SHDN | Shutdown control input | High = shutdown (2μA IQ, OUT high-Z); low = normal operation; threshold = 0.2×VBATT / 0.8×VBATT |
| 5 - GND | Power and signal ground | Common reference for all circuits; must be connected directly to ground plane for optimal EMI/thermal performance |
| 6 - LX | Inductor switch node | Connects to inductor; integrates damping switch to suppress ringing and reduce EMI |
| 7 - OUT | Regulated power output | Provides 3.3V/5.0V output; supplies bootstrap power to IC; high-impedance in shutdown |
| 8 - BATT | Battery input & damping switch connection | Accepts 0.7–5.5V input; connects internally to damping switch for inductor energy dissipation |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Fully disconnects OUT from BATT in shutdown, eliminating leakage path and enabling true zero-load battery drain |
| Synchronous Rectification | Internal P-channel MOSFET replaces external Schottky diode-reducing board area, cost, and conduction losses |
| LX-Damping Circuitry | On-chip damping switch minimizes inductor ringing and associated EMI without impacting output ripple or requiring external parts |
| LBI/LBO Comparator Active in Shutdown | Enables continuous battery monitoring during system sleep-critical for accurate low-battery alerts in portable devices |
| Ultra-Low Quiescent Current | 25μA operating / 2μA shutdown current extends battery life in always-on monitoring applications |
Applications
| Portable Digital Audio Players | Wireless Handsets |
|---|---|
Use Scenario: Powering 3.3V audio DACs and RF front-ends from single-cell alkaline batteries (0.9–1.6V). IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V rail with fast transient response to handle burst-mode audio playback. Use Value: Enables >100-hour playback on AA/AAA cells by maintaining >90% efficiency down to 10mA load and supporting 0.85V startup. |
Use Scenario: Supplying 5.0V backlight and 3.3V logic rails in GSM/GPRS handsets with tight PCB height constraints. IC Role / Device Role / Timing Role: Compact boost converter delivering regulated output while coexisting with sensitive RF transceivers. Use Value: Integrated LX damping reduces conducted EMI, preventing interference with cellular band reception without added filtering components. |
| PDAs / Palmtops | Portable Terminals |
Use Scenario: Generating 3.3V system rail from Li-ion or NiMH battery packs under dynamic CPU load conditions. IC Role / Device Role / Timing Role: Primary DC-DC converter managing power sequencing and brownout detection via LBI/LBO interface. Use Value: LBI comparator active in shutdown allows host MCU to monitor battery level during deep-sleep modes-extending operational uptime. |
Use Scenario: Powering 5.0V smart-card readers and 3.3V microcontrollers in handheld inventory scanners running on primary cells. IC Role / Device Role / Timing Role: High-efficiency boost stage ensuring consistent voltage delivery despite declining battery voltage (0.7–1.5V range). Use Value: 0.7V minimum input operation supports full battery utilization-delaying replacement in mission-critical field deployments. |
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 |
|---|---|---|---|
| TPS61022DRVR | Higher 2A current limit, 2.5V–5.5V input, but requires external diode; no integrated LBI/LBO comparator | Supports higher-power loads (e.g., LCD bias), but lacks built-in battery monitoring-requires additional circuitry | Choose TPS61022DRVR when >180mA output or wider input range is needed, and external monitoring is acceptable |
| RT8535GJ6 | 0.5A current limit, 0.6V–4.5V input, 2.5μA shutdown current; no LX damping or LBI/LBO functionality | Lower profile (0.55mm height), but unsuitable for EMI-sensitive RF sections or battery-monitoring systems | Choose RT8535GJ6 only for cost-sensitive, non-RF, non-monitoring applications where minimal height is critical |
Compared with TPS61022DRVR and RT8535GJ6, MAX1795EUA uniquely combines ultra-low input voltage operation (0.7V), integrated battery monitoring (LBI/LBO), and EMI-suppressing LX damping in a sub-1.1mm package-making it irreplaceable for compact, battery-aware portable electronics requiring robust noise immunity.
Availability
MAX1795EUA is available at Aetrix Electronics and suitable for portable digital audio players, wireless handsets, and PDAs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX1795EUA 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 analog and mixed-signal ICs for power management, sensing, and communications.
The MAX1795EUA belongs to Maxim's low-quiescent-current step-up DC-DC converter family, designed specifically for battery-powered portable equipment demanding high efficiency at ultra-low input voltages and integrated system monitoring functions.
FAQ
What is the minimum input voltage required for MAX1795EUA to start up and operate?
The MAX1795EUA guarantees startup from +0.85V at +25°C and operates continuously down to +0.7V after startup. This enables reliable operation from nearly depleted single-cell alkaline or NiMH batteries. The startup voltage has a tempco of −2.2mV/°C, so at −40°C it rises to ~0.95V. Operation below 0.7V is not supported, and the device will cease regulation if input drops below this threshold during operation.
How does MAX1795EUA achieve 95% efficiency without an external Schottky diode?
The MAX1795EUA achieves up to 95% efficiency using an internal synchronous rectifier: a P-channel MOSFET that replaces the external Schottky diode. During the off-cycle, this MOSFET turns on and shunts the body diode of the N-channel switch, reducing forward voltage drop from ~0.3V to <0.1V. Combined with low RDS(ON) (0.17Ω NFET, 0.27Ω PFET), this eliminates diode conduction loss and enables high efficiency even at light loads.
Can MAX1795EUA be used to generate an adjustable output voltage, and what is the supported range?
Yes, MAX1795EUA supports adjustable output from +2.0V to +5.5V using a resistive divider from OUT to FB to GND. The feedback set-point voltage is tightly regulated at 1.24V (±0.04V). To set VOUT, use R1 = R2 × ((VOUT / 1.24) − 1), with R2 ≤ 250kΩ. This flexibility allows custom rail generation-for example, 2.8V for OLED displays or 4.2V for Li-ion charging circuits-without changing the IC.
What is the function of the LX damping switch in MAX1795EUA, and how does it affect system design?
The LX damping switch in MAX1795EUA connects an internal resistor (100–400Ω) across the inductor when energy depletion occurs, rapidly dissipating resonant ringing energy at the LX node. This reduces high-frequency EMI without increasing output ripple or requiring external snubbers. As a result, PCB layout is simplified, RF-sensitive sections (e.g., Bluetooth modules) experience less interference, and compliance testing passes more reliably-no added components or board area needed.
Is the LBI/LBO comparator functional during shutdown mode of MAX1795EUA?
Yes, the LBI/LBO comparator remains fully operational during shutdown mode of MAX1795EUA. When SHDN is high, the DC-DC converter halts switching and places OUT in high-impedance, but the comparator continues monitoring the LBI pin against its 0.85V threshold and drives LBO accordingly. This allows host systems to detect low-battery conditions and initiate graceful shutdown-even while the main power rail is disabled-extending usable battery life in portable devices.
MAX1795EUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V (3.3V, 5V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 200mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1795EUA FAQ
1.How can I place an order for MAX1795EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1795EUA 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 MAX1795EUA reliable?
The price and inventory of MAX1795EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1795EUA is usually 5 days.
3.What payment methods are accepted for MAX1795EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1795EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1795EUA?
MAX1795EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1795EUA 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 MAX1795EUA?
For technical support, including MAX1795EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1795EUA requirements.
6.How does Aetrix verify that MAX1795EUA is sourced from the original manufacturer or authorized distributors?
All MAX1795EUA 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 MAX1795EUA meets industry standards.
7.What is the process for return or replacement of MAX1795EUA?
All MAX1795EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1795EUA, 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 MAX1795EUA part is unused and in its original packaging.
Return procedure for MAX1795EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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