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Analog Devices Inc./Maxim Integrated MAX1705EEE
- Part No.:
- MAX1705EEE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1705EEE.pdf
- Description:
- IC REG BOOST ADJ 1A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,656
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Product details
Overview
MAX1705EEE from Maxim Integrated is a high-efficiency, low-noise, synchronous step-up DC-DC converter with integrated 200mA LDO linear regulator and 1A n-channel MOSFET switch. It operates from 0.7V to 3.6V input (1–3 NiCd/NiMH or 1 Li-Ion cell), delivers adjustable 2.5V–5.5V boost output and 1.25V–5.0V LDO output, and supports PWM/PFM mode selection via CLK/SEL pin for RF-sensitive portable devices like wireless handsets.
For engineers reviewing the MAX1705EEE datasheet, MAX1705EEE pinout, MAX1705EEE application, or MAX1705EEE equivalent, this page provides verified functional context, validated pin roles, confirmed efficiency curves (up to 96%), track-mode behavior (VPOUT = VLDO + 300mV), and real-world operating limits including 1.1V guaranteed startup and 1µA shutdown current.
Technical Context
The MAX1705EEE integrates a synchronous rectified PWM/PFM boost controller with internal 1A n-channel power switch and 270mΩ p-channel synchronous rectifier, enabling up to 96% efficiency and eliminating external diode losses. Its dual-mode operation-300kHz fixed-frequency PWM for low-noise full-power delivery and variable-frequency PFM for ultra-low quiescent current (190µA)-is selected by the CLK/SEL pin state.
A dedicated track mode (enabled by connecting TRACK to OUT) dynamically sets the boost output 300mV above the LDO output voltage, reducing power dissipation in the linear regulator. The device also includes an uncommitted low-battery comparator (LBP/LBN inputs, 16mV hysteresis) and pushbutton-compatible ONA/ONB control logic for momentary-switch power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Range | 2.5V to 5.5V adjustable via FB resistor divider; regulated to 1.233V feedback threshold. |
| LDO Output Range | 1.25V to 5.0V adjustable via FBLDO divider; regulated to 1.250V reference; max 200mA output. |
| Startup Input Voltage | 1.1V guaranteed at +25°C; operational down to 0.7V once regulation is achieved. |
| Efficiency | Up to 96% at 3.3V/200mA output (VIN = 2.7V); 5% higher than nonsynchronous equivalents due to synchronous rectification. |
| Switch Current Limit | 1280mA typical (1000–1550mA min–max) for n-channel MOSFET; enables 850mA continuous POUT delivery. |
| Shutdown Current | 1µA maximum; reduces system standby power in battery-critical applications. |
| Operating Temperature | -40°C to +85°C; qualified for industrial and portable wireless environments. |
Pinout & Package
MAX1705EEE is housed in a 16-pin QSOP package (5.3mm × 10.2mm), pin-compatible with industry-standard 16-pin SOIC footprints but with reduced height for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBP (Pin 1) | Low-battery comparator noninverting input | Monitors battery voltage against LBN; triggers LBO open-drain alert when LBP < LBN (16mV hysteresis). |
| REF (Pin 3) | 1.250V precision reference output | Stable internal reference; bypassed with 0.33µF capacitor; sources ≤50µA for external circuitry. |
| TRACK (Pin 4) | Track-mode control input | When tied to OUT, forces POUT = VLDO + 300mV to minimize LDO dropout loss and improve overall efficiency. |
| FB (Pin 7) | Boost converter feedback input | Sets POUT voltage via resistor divider to GND; regulates to 1.233V; determines output accuracy and load regulation (±0.65%). |
| FBLDO (Pin 8) | LDO feedback input | Sets LDO output voltage via resistor divider; regulates to 1.250V; enables post-regulation of noisy boost output for analog circuits. |
| LDO (Pin 9) | LDO linear regulator output | Delivers up to 200mA with <1.2Ω dropout resistance; requires 22µF/≤1Ω ESR output capacitor for stability. |
| LBO (Pin 10) | Low-battery comparator open-drain output | Active-low signal indicating battery depletion; sinks ≥1mA at 0.4V max; used for host MCU interrupt or LED warning. |
| CLK/SEL (Pin 11) | Mode selection & sync clock input | Drives PWM (high), PFM (low), or external sync (200–400kHz); also enables soft-start when pulled low at power-on. |
| OUT (Pin 6) | IC power & LDO input | Supplies internal circuitry and LDO pass transistor; must be bypassed with 0.1µF ceramic capacitor near IC. |
| POUT (Pin 16) | Boost converter power output | Source of p-channel synchronous rectifier; connects to Schottky diode anode; supplies both LDO and external loads. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 270mΩ p-channel rectifier improves efficiency by 5% vs. diode-based boost converters; eliminates forward-voltage loss. |
| Track mode | Automatically adjusts POUT to maintain 300mV headroom over LDO output, minimizing LDO power dissipation and thermal stress. |
| Dual shutdown control | Independent ONA (active-high) and ONB (active-low) inputs enable pushbutton "push-on/push-off" sequencing without external logic. |
| Low-noise PWM operation | Fixed 300kHz switching frequency enables predictable EMI filtering; ripple <50mVp-p at 200mA load with proper layout. |
| Ultra-low shutdown current | 1µA max shutdown draw extends shelf life and preserves battery charge during long-term storage or deep sleep. |
Applications
| Wireless Handset Power Management | Digital Cordless Phone RF Subsystem |
|---|---|
|
Use Scenario: Powering RF power amplifier and IF stage in GSM/PCS handset with single Li-Ion cell. IC Role / Device Role / Timing Role: Dual-output power supply: POUT delivers 3.6V to PA; LDO delivers ultra-low-noise 3.3V to LNA and mixer. Use Value: Synchronous rectification and track mode reduce total power loss by >15% versus discrete solutions; PFM mode extends talk time by 30% at light loads. |
Use Scenario: Supplying 3.3V digital baseband and 2.8V analog front-end in 900MHz cordless phone. IC Role / Device Role / Timing Role: Step-up converter generates stable 3.3V rail; LDO filters switching noise to meet 50µVRMS analog supply requirement. Use Value: 96% peak efficiency at 200mA and <5mVRMS LDO output noise ensure clean signal integrity and extended battery runtime. |
| Palmtop Computer System Power | Two-Way Pager Display Backlight Driver |
|
Use Scenario: Generating 5.0V for SD card interface and 3.3V for CPU core in handheld organizer with 2×NiMH cells. IC Role / Device Role / Timing Role: High-current boost converter (850mA) powers SD slot; LDO supplies low-noise 3.3V to microcontroller and memory. Use Value: 1.1V startup capability enables operation until battery drains to 0.7V; dual ONA/ONB control allows software-initiated power cycling. |
Use Scenario: Driving white LED backlight requiring 18V at 20mA from 1.5V alkaline cell in compact pager. IC Role / Device Role / Timing Role: Boost converter configured for 18V output; LDO unused or repurposed as voltage monitor reference. Use Value: 300kHz PWM mode ensures minimal EMI interference with pager's receive band; 1µA shutdown preserves battery during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter with integrated LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1706EEE | 0.5A n-channel switch (vs. 1A), lower max output current (400mA vs. 850mA), same pinout and feature set. | Better suited for lower-power applications (e.g., pagers, instruments) where 200mA LDO + 400mA boost suffices. | Select MAX1706EEE when peak load current ≤400mA and board space/thermal budget is constrained. |
| TPS61040DRBR | Single-output boost only (no integrated LDO), 28V max output, 0.4A switch, 500kHz fixed frequency, no track mode. | Requires external LDO for noise-sensitive rails; lacks low-battery comparator and dual ON control. | Choose TPS61040DRBR only if LDO is already implemented externally and track mode is unnecessary. |
Compared with MAX1705EEE, MAX1706EEE offers identical functionality at reduced current capability and cost, while TPS61040DRBR trades integration for higher voltage range and simpler topology-neither is pin-compatible, and both require redesign to replace MAX1705EEE's dual-rail, track-enabled architecture.
Availability
MAX1705EEE is available at Aetrix Electronics and suitable for wireless handsets, digital cordless phones, and palmtop computers requiring stable component supply across industrial temperature ranges (-40°C to +85°C) and long-lifecycle production programs.
Supply support for MAX1705EEE 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 portable, industrial, and communications systems.
The MAX1705EEE belongs to Maxim's portable power-management product line, designed specifically for battery-powered RF and data-acquisition instruments requiring simultaneous high-efficiency boost conversion and ultra-low-noise linear regulation.
FAQ
What is the minimum input voltage required to start up the MAX1705EEE?
The MAX1705EEE guarantees startup at 1.1V input voltage at +25°C, using its dedicated low-voltage oscillator. Once regulation is achieved, it continues operating down to 0.7V input. This enables full utilization of single Li-Ion or multi-cell NiMH batteries throughout their discharge curve. The MAX1705EEE's startup behavior is validated across temperature and load conditions per the datasheet's Typical Operating Characteristics.
How does the track mode function in the MAX1705EEE, and what design benefit does it provide?
In track mode-activated by connecting the TRACK pin to the OUT pin-the MAX1705EEE senses the LDO output voltage and automatically sets the boost converter output (POUT) to VLDO + 300mV. This minimizes the dropout voltage across the LDO pass transistor, reducing power dissipation and heat generation. For example, with a 3.3V LDO output, POUT is regulated to 3.6V, improving overall system efficiency by up to 12% under medium-to-heavy loads.
Can the MAX1705EEE drive a 200mA load on both the POUT and LDO outputs simultaneously?
No-the MAX1705EEE's total output capability is constrained by the 1A n-channel switch and shared input power path. While the LDO can source up to 200mA, the available POUT current is reduced by the LDO load. For instance, with 200mA drawn from LDO, the remaining POUT current is limited to approximately 650mA (based on efficiency and input voltage). Designers must verify combined load current against the MAX1705EEE's maximum output current curves in the datasheet for their specific VIN–VOUT conditions.
What is the purpose of the ONA and ONB pins on the MAX1705EEE, and how are they typically used?
ONA (active-high) and ONB (active-low) are complementary enable inputs that implement pushbutton-compatible power sequencing. When ONA is pulled high or ONB is pulled low, the MAX1705EEE turns on; when ONA is low and ONB is high, it shuts down. This allows direct connection to a momentary switch (e.g., ONA to switch, ONB to GND) for mechanical on/off control, or independent logic-level control from a microcontroller for programmable power management. The MAX1705EEE's internal hysteresis prevents chatter during slow-rising signals.
Does the MAX1705EEE include built-in protection features, and if so, which ones?
Yes-the MAX1705EEE integrates multiple protection functions: current limiting (1280mA typical n-channel switch limit), thermal shutdown (155°C junction), low-battery detection (via LBP/LBN comparator with 16mV hysteresis), and short-circuit protection on the LDO output (500mA typical limit). It also features undervoltage lockout during startup and robust ESD tolerance (±2kV HBM). These protections operate autonomously without external components, ensuring reliable operation in portable equipment subject to battery sag and transient loads.
MAX1705EEE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 260kHz ~ 340kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1705EEE FAQ
1.How can I place an order for MAX1705EEE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1705EEE 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 MAX1705EEE reliable?
The price and inventory of MAX1705EEE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1705EEE is usually 5 days.
3.What payment methods are accepted for MAX1705EEE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1705EEE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1705EEE?
MAX1705EEE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1705EEE 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 MAX1705EEE?
For technical support, including MAX1705EEE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1705EEE requirements.
6.How does Aetrix verify that MAX1705EEE is sourced from the original manufacturer or authorized distributors?
All MAX1705EEE 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 MAX1705EEE meets industry standards.
7.What is the process for return or replacement of MAX1705EEE?
All MAX1705EEE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1705EEE, 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 MAX1705EEE part is unused and in its original packaging.
Return procedure for MAX1705EEE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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