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Analog Devices Inc./Maxim Integrated MAX1703ESE+
- Part No.:
- MAX1703ESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1703ESE+.pdf
- Description:
- IC REG BST ADJ/2.5V 2.2A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
The MAX1703ESE+ from Maxim Integrated is a high-efficiency, low-noise, synchronous step-up DC-DC converter designed for battery-powered wireless systems. It delivers up to 1.5A output at 5V (or adjustable 2.5V–5.5V) from 0.7V–5.5V inputs (1–3 NiCd/NiMH or 1 Li-Ion cell), features integrated 75mΩ N-channel and 140mΩ P-channel MOSFETs, operates in PWM (300kHz) or PFM mode, and includes a power-good comparator and uncommitted gain block. It is used in digital cordless phones and palmtop computers requiring stable, low-noise boost regulation.
For engineers reviewing the MAX1703ESE+ datasheet, MAX1703ESE+ pinout, MAX1703ESE+ application, or MAX1703ESE+ equivalent, key selection criteria include input voltage start-up capability (0.9V typ), synchronous rectifier efficiency gain (+5%), dual-mode control (CLK/SEL pin), power-good threshold accuracy (1.250V ±25mV), and narrow SO-16 thermal performance (696mW at +70°C).
Technical Context
The MAX1703ESE+ implements a synchronous PWM/PFM dual-mode boost architecture with internal N-channel switch (2.7A current limit) and P-channel synchronous rectifier. Its feedback loop uses a precision 1.250V bandgap reference (±1% over temperature) and supports fixed 5V or resistor-adjustable output via FB pin.
Control logic responds to CLK/SEL state: high enables constant-frequency 300kHz PWM (up to 1.5A); low enables discontinuous-conduction PFM (≤150mA, 300µW quiescent); external clock synchronizes switching between 200–400kHz. The gain block (10mmho transconductance) and open-drain POK/AO outputs support linear regulator augmentation and battery monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 1.5A in PWM mode; enables high-power RF stages in PCS handsets without external pass devices. |
| Input Voltage Range | 0.7V to 5.5V; supports single Li-Ion (2.7–4.2V) or 1–3 NiCd/NiMH cells down to end-of-discharge. |
| Switching Frequency | 300kHz (PWM, fixed), 200–400kHz (synchronized), or variable (PFM); allows EMI filtering and IF-band avoidance in wireless designs. |
| Efficiency | Up to 95% at 500mA (VIN=3.6V, VOUT=5V); synchronous rectification eliminates Schottky forward-drop loss. |
| Quiescent Current | 1µA in shutdown, 300µW in PFM mode; extends battery life in standby states of pagers and communicators. |
| Reference Voltage | 1.250V ±1% (0°C to +85°C); ensures accurate output regulation across temperature for stable system rail generation. |
| Power-Good Threshold | 1.250V ±25mV on POKIN with 10mV hysteresis; enables reliable low-battery detection with minimal external components. |
Pinout & Package
The MAX1703ESE+ is housed in a 16-pin narrow SOIC (SO-16N) package with 1.27mm pitch, 10.3mm × 5.3mm body, and exposed thermal pad not connected internally. Pin 1 is REF; pin 16 is ON. PGND pins (10,12) and POUT pins (13,15) are separately routed for optimal power-ground separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 2) | Dual-Mode Feedback Input | Connects to resistor divider for adjustable output (2.5–5.5V) or to GND for fixed 5V; 20nA bias current enables high-impedance dividers. |
| REF (Pin 1) | Precision Reference Output | 1.250V ±1% bandgap source; requires 0.22µF ceramic bypass within 5mm for stability and noise immunity. |
| CLK/SEL (Pin 9) | Mode Control & Sync Input | Logic-high = PWM (300kHz); logic-low = PFM (low-quiescent); external clock = synchronized PWM (200–400kHz). |
| POKIN (Pin 3) | Power-Good Comparator Input | Monitors regulated output or battery voltage; 1.250V trip point with 10mV hysteresis enables accurate undervoltage lockout. |
| AO (Pin 7) | Gain-Block Output | Open-drain N-channel output sinking current when AIN < REF; drives external P-FET for linear post-regulation. |
| LXP/LXN (Pins 14/11) | Switch Node Terminals | Drains of internal N- and P-channel MOSFETs; must be shorted externally and connected to Schottky diode anode and inductor. |
| PGND (Pins 10,12) | Power Ground Return | Separate ground path for high-current switch return; minimizes noise coupling into signal ground (Pin 5). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated 140mΩ P-channel rectifier improves efficiency by 5% vs. diode-based boost converters, reducing thermal load in compact handhelds. |
| Dual-Mode Operation | Hardware-selectable PWM (high-power, low-noise) or PFM (ultra-low-quiescent) via CLK/SEL pin-no firmware required for dynamic power-state adaptation. |
| Low-Voltage Start-Up | Guaranteed 0.9V start-up (25°C) with bootstrap operation down to 0.7V enables use with deeply discharged batteries in two-way pagers. |
| Uncommitted Gain Block | 10mmho transconductance amplifier with open-drain AO output supports linear regulator augmentation or second comparator function without external op-amps. |
| Power-Good Monitoring | Open-drain POK output sinks 1mA; combined with POKIN's 1.250V threshold, enables robust system reset or battery-alert signaling with two resistors. |
Applications
| Digital Cordless Phones | Palmtop Computers |
|---|---|
Use Scenario: Powering RF front-end and baseband ICs from single-cell NiMH battery during call transmission. IC Role / Device Role / Timing Role: Primary step-up regulator generating stable 5V rail; synchronizes switching to avoid interference with IF bands using external CLK. Use Value: 95% efficiency at 1A load extends talk time; PFM mode reduces standby current to 300µW, enabling multi-day idle battery life. |
Use Scenario: Supplying core logic and display backlight from aging 1-cell Li-Ion battery with voltage sag below 3.0V. IC Role / Device Role / Timing Role: Adjustable-output boost converter (set to 3.3V) with FB feedback; uses gain block (AO/AIN) to add low-noise linear post-regulation. Use Value: 0.7V minimum operating input sustains operation until battery depletion; synchronous rectifier maintains >90% efficiency even at 2.2V input. |
| Personal Communicators | Hand-Held Instruments |
Use Scenario: Providing clean 5V supply to microcontroller and GSM modem in compact form factor with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise PWM regulator with 300kHz fixed frequency; POK monitors output to trigger brown-out reset before system crash. Use Value: Constant-frequency operation enables predictable EMI filtering; 1.250V POKIN threshold ensures reliable reset at 4.87V output (–1.6% load regulation). |
Use Scenario: Powering precision ADC and sensor interface from primary alkaline battery with wide discharge curve (1.5V → 0.9V). IC Role / Device Role / Timing Role: High-efficiency boost converter with start-up oscillator active down to 0.9V; REF pin supplies stable 1.25V reference to external circuitry. Use Value: 0.9V guaranteed start-up enables full functionality across entire battery life; REF output rated for 50µA load supports external analog blocks. |
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 |
|---|---|---|---|
| MAX1705ESE+ | Dual-output: integrated step-up + linear regulator; higher quiescent current (120µA vs. 1µA shutdown); same SO-16 package. | Used where post-regulated low-noise auxiliary rail (e.g., for RF synth) is required alongside main boost output. | Select MAX1705ESE+ only if dual-rail generation is needed; MAX1703ESE+ offers superior shutdown current and simpler BOM for single-output designs. |
| TPS61040DRVR | Higher switching frequency (500kHz), lower max output current (0.3A), no integrated synchronous rectifier, different pinout (6-pin WSON). | Suitable for space-constrained, low-power applications (e.g., wearables) but lacks PFM mode and gain block functionality. | Choose TPS61040DRVR for ultra-small footprint and cost-sensitive designs; MAX1703ESE+ remains preferred for high-current, low-noise, feature-rich portable RF systems. |
Compared with MAX1705ESE+ and TPS61040DRVR, the MAX1703ESE+ uniquely combines 1.5A output, synchronous rectification, dual-mode control, and analog peripherals (gain block, POK, REF) in a single SO-16 package-making it optimal for mid-power wireless handsets where efficiency, noise, and integration are co-prioritized.
Availability
MAX1703ESE+ is available at Aetrix Electronics and suitable for digital cordless phones, palmtop computers, and personal communicators requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX1703ESE+ 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, communications, and consumer applications.
The MAX1703ESE+ belongs to Maxim's portable power-management product line, engineered specifically for battery-powered wireless devices demanding high efficiency, low EMI, and intelligent power-state control without firmware overhead.
FAQ
What is the minimum input voltage required to start up the MAX1703ESE+?
The MAX1703ESE+ guarantees start-up at 0.9V (typical) at +25°C using its internal low-voltage oscillator. Once regulation is achieved, it continues operating down to 0.7V input due to bootstrap powering from the OUT pin. Full-load current should not be applied until the output exceeds 2.3V to ensure stable control loop engagement. This behavior is confirmed in the Absolute Maximum Ratings and Typical Operating Characteristics sections of the MAX1703ESE+ datasheet.
How does the MAX1703ESE+ achieve higher efficiency than nonsynchronous boost converters?
The MAX1703ESE+ achieves up to 5% higher efficiency through its integrated 140mΩ P-channel synchronous rectifier, which replaces the lossy Schottky diode typically used in nonsynchronous designs. During the off-phase of the N-channel switch, the synchronous rectifier conducts with significantly lower voltage drop (≈0.1V vs. ≈0.3V), reducing conduction losses-especially critical at high output currents like 1.5A. This is explicitly quantified in the General Description and Detailed Description sections of the MAX1703ESE+ datasheet.
Can the MAX1703ESE+ generate a fixed 5V output without external resistors?
Yes-the MAX1703ESE+ supports fixed 5V output by connecting the FB pin directly to GND. This configuration bypasses the external resistor divider and configures the internal feedback network for nominal 5V regulation (4.87V to 5.20V over temperature and load). The datasheet specifies this as the default fixed-output option, validated across all operating conditions including PFM and PWM modes.
What is the function of the CLK/SEL pin on the MAX1703ESE+?
The CLK/SEL pin on the MAX1703ESE+ controls operating mode: logic-high enables constant-frequency 300kHz PWM mode (full 1.5A output); logic-low activates low-quiescent PFM mode (≤150mA, 300µW); an external 200–400kHz clock synchronizes PWM switching. This pin also provides soft-start functionality when pulled low during power-on, limiting peak inductor current to 25% of PWM mode value. All behaviors are documented in the Pin Description and Detailed Description sections.
Does the MAX1703ESE+ include protection features such as overcurrent or thermal shutdown?
The MAX1703ESE+ includes cycle-by-cycle N-channel switch current limiting (2.2A min, 3.2A max) and internal thermal shutdown that disables the device above +150°C junction temperature. It does not include dedicated overvoltage or reverse-polarity protection-those functions require external components. These protections are specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the MAX1703ESE+ datasheet, with current-limit thresholds tested under defined conditions (e.g., VBATT = 3.7V).
MAX1703ESE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V (5V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2.2A (Switch)
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX1703ESE+ FAQ
1.How can I place an order for MAX1703ESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1703ESE+ 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 MAX1703ESE+ reliable?
The price and inventory of MAX1703ESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1703ESE+ is usually 5 days.
3.What payment methods are accepted for MAX1703ESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1703ESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1703ESE+?
MAX1703ESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1703ESE+ 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 MAX1703ESE+?
For technical support, including MAX1703ESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1703ESE+ requirements.
6.How does Aetrix verify that MAX1703ESE+ is sourced from the original manufacturer or authorized distributors?
All MAX1703ESE+ 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 MAX1703ESE+ meets industry standards.
7.What is the process for return or replacement of MAX1703ESE+?
All MAX1703ESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1703ESE+, 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 MAX1703ESE+ part is unused and in its original packaging.
Return procedure for MAX1703ESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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