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Analog Devices Inc./Maxim Integrated MAX1687EUE
- Part No.:
- MAX1687EUE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1687EUE.pdf
- Description:
- IC REG BOOST ADJ 730MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,216
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Product details
Overview
MAX1687EUE from Maxim Integrated is a step-up DC-DC converter IC designed for GSM RF power amplifier burst-load supply, featuring precise voltage-controlled current limiting, 90% peak efficiency, 2.7V–6V input range, and 1.25V–6V adjustable output. It operates in TSSOP-16 package with internal synchronous rectification and logic-controlled shutdown.
For engineers reviewing the MAX1687EUE datasheet, MAX1687EUE pinout, MAX1687EUE application, or MAX1687EUE equivalent, key selection criteria include peak battery current limitation (≤450mA), adaptive reservoir capacitor charging control, GSM-synchronized standby mode to suppress switching noise, and compatibility with single Li-Ion or triple NiMH battery inputs.
Technical Context
The MAX1687EUE implements hysteretic inductor-current control with programmable peak current via the LIM pin (0–1V input), enabling precise battery current regulation during RF transmit bursts. Its four-phase startup sequence-Linear Regulator → Pseudo Buck → Pseudo Boost → Boost-limits inrush current and stabilizes VOUT slope during power-up.
It integrates dual MOSFETs (P-channel and N-channel), an internal current-sense resistor (RSENSE = 0.7Ω typ), and analog ground (AGND) / power ground (PGND) separation to minimize noise coupling. Shutdown is triggered by holding ON low >1.2ms, reducing quiescent current to 3µA while disconnecting OUT from IN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - supports single Li-Ion (3.0–4.2V), triple NiMH (3.6V), or alkaline cells without external regulation |
| Output Voltage Range | 1.25V to 6V - set externally via FB resistor divider; regulated to ±2.3% over temperature |
| Peak Battery Current | ≤450mA - limits surge draw during GSM 12% duty-cycle bursts, extending battery life and minimizing voltage sag |
| Conversion Efficiency | Up to 90% - achieved via internal synchronous rectification, eliminating Schottky diode losses and thermal overhead |
| Shutdown Current | 3µA - enables ultra-low-power system sleep states without external load switches |
| Switching Frequency | Exceeds 1MHz - determined by inductor value; allows compact magnetics and reduced EMI filtering requirements |
| Operating Temperature | −40°C to +85°C - qualified for industrial and handheld wireless applications with no derating |
Pinout & Package
MAX1687EUE is housed in a 16-pin thin-shrink small-outline package (TSSOP), 4.4mm × 5mm × 1.1mm max height, with exposed thermal pad (not electrically connected). Pin 1 marked by dot; pin count increases left-to-right, top row 1–8, bottom row 9–16.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 16) | Supply Input | Battery connection point; requires ≥47µF low-ESR bypass capacitor to PGND to stabilize input impedance during burst loads |
| OUT (Pins 1, 2) | Regulated Output | High-current output node feeding reservoir capacitor; dual pins reduce trace resistance and thermal rise under 2A pulsed loads |
| LX1 (Pins 3, 4) | Inductor Switch Node | Connects to one end of boost inductor; carries high di/dt switching current; must be routed short and wide |
| LX2 (Pins 13, 14) | Power Switch Drain | Internal N- and P-MOSFET drain node; connects to second inductor end and PGND return path |
| PGND (Pins 11, 12) | Power Ground | Low-impedance return for LX1/LX2 and output capacitor; star-connected to minimize ground bounce |
| AGND (Pin 10) | Analog Ground | Reference ground for FB, REF, LIM; isolated from PGND to prevent noise injection into feedback loop |
| FB (Pin 9) | Feedback Input | Senses output voltage via resistor divider; regulates to 1.25V nominal with 200µA/V transconductance |
| REF (Pin 8) | Reference Output | 1.25V ±2.3% precision reference; supplies ≤10µA for external LIM bias networks |
| ON (Pin 7) | Enable/Standby Control | Active-high logic input; low >1.2ms forces 3µA shutdown; synchronized low during RF burst eliminates switching noise |
| LIM (Pin 6) | Current Limit Adjust | 0–1V analog input sets peak battery current per ILIM = VLIM×0.86A/V − 0.06A; clamped at 1.25V internally |
| GND (Pin 5) | Ground Reference | Common reference for AGND and PGND; tied together at single-point star ground on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage-controlled current limit | Enables deterministic battery current capping (450mA max) without external sense resistors or op-amps |
| Four-phase soft-start sequence | Prevents input voltage droop and system reset during power-up by ramping VOUT with controlled inrush |
| Output disconnect during shutdown | Isolates reservoir capacitor from battery, preventing leakage discharge and preserving burst energy |
| Integrated synchronous rectification | Eliminates external Schottky diode, saving board space and improving efficiency by ~5% vs. diode-based designs |
| GSM-synchronized standby mode | Allows ON pin to gate converter operation precisely during RF transmit intervals, removing switching noise from sensitive PA stages |
Applications
| GSM Mobile Handsets | Wireless LAN PC Cards (PCMCIA) |
|---|---|
Use Scenario: Powering RF power amplifier during 12% duty-cycle GSM transmit bursts requiring up to 2A peak at 5V. IC Role / Device Role / Timing Role: Step-up DC-DC converter supplying burst energy from reservoir capacitor; synchronized to ON pin for noise-free RF transmission windows. Use Value: Limits peak battery current to ≤450mA, preventing voltage sag below 2.7V and extending usable battery capacity by 18% over conventional boost converters. | Use Scenario: Providing regulated 3.3V or 5V to WLAN baseband and RF ICs in Type II PCMCIA slots with strict input current limits. IC Role / Device Role / Timing Role: High-efficiency boost regulator with programmable current limit, enabling compliance with PC Card power budget constraints (≤500mA). Use Value: Adjustable LIM input allows dynamic current limiting via host controller DAC, supporting variable burst loads without hardware change. |
| Industrial Telematics Modems | Portable Medical RF Transceivers |
Use Scenario: Delivering stable 5V supply to cellular modem modules in vehicle-mounted GPS trackers operating across wide temperature ranges. IC Role / Device Role / Timing Role: Primary power stage converting 3.6V NiMH pack to 5V; leverages −40°C to +85°C rating and robust startup sequencing. Use Value: Four-phase start-up prevents brown-out during cold cranking events; TSSOP package ensures reliable solder joints under vibration. | Use Scenario: Supplying burst power to implantable-grade RF telemetry circuits requiring ultra-low EMI and predictable current draw. IC Role / Device Role / Timing Role: Low-noise, synchronized boost converter with output disconnect; ON pin driven by microcontroller to align with data transmission timing. Use Value: 3µA shutdown current and precise current limiting meet IEC 60601-1 leakage and battery life requirements for Class II portable devices. |
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 |
|---|---|---|---|
| MAX1688EUE | Replaces LIM pin with CHG pin; implements adaptive constant-recharge-time algorithm instead of fixed current limit | Optimized for varying burst loads and input voltages; automatically adjusts peak inductor current based on output droop | Select MAX1688EUE when battery life optimization across discharge curve is critical; MAX1687EUE preferred for fixed, known burst profiles with DAC control |
| TPS61040DRVR | Fixed 28V OVP, no LIM/CHG pin; 500kHz fixed-frequency PWM vs. MAX1687EUE's hysteretic control | Lacks GSM-synchronized standby; no output disconnect in shutdown; lower peak efficiency (85%) at 2A burst | Choose TPS61040DRVR only for non-GSM constant-load applications where cost and footprint are prioritized over burst efficiency and noise control |
Compared with MAX1687EUE, MAX1688EUE delivers superior battery life under variable load conditions via adaptive recharge timing, while TPS61040DRVR offers simpler implementation but sacrifices GSM-specific features like synchronized noise suppression and precise current limiting-making MAX1687EUE the optimal choice for RF burst-load systems requiring deterministic battery current control.
Availability
MAX1687EUE is available at Aetrix Electronics and suitable for GSM handset design, wireless PC card development, and industrial telematics applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for MAX1687EUE 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for communications, computing, and industrial markets.
The MAX1687EUE belongs to Maxim's GSM-optimized power management product line, engineered specifically to address battery current surge, RF noise coupling, and reservoir capacitor dynamics in burst-mode wireless transmitters.
FAQ
What is the primary function of the LIM pin on the MAX1687EUE?
The LIM pin on the MAX1687EUE is an analog input that sets the peak battery current limit between 200mA and 450mA using a 0–1V control voltage. It implements a precision voltage-controlled current limit (ILIM = VLIM × 0.86A/V − 0.06A), enabling deterministic battery current management during GSM RF bursts without external sensing components. This feature is central to the MAX1687EUE's role in maximizing battery life and minimizing voltage sag.
Does the MAX1687EUE support GSM-synchronized operation, and how is it implemented?
Yes, the MAX1687EUE supports GSM-synchronized operation via its ON pin. Driving ON low during RF transmit bursts places the device in standby mode, halting switching activity and allowing the output reservoir capacitor to supply burst current. This eliminates switching noise coupling into sensitive RF power amplifier stages. The MAX1687EUE's 1.2ms shutdown delay ensures clean transitions, and its output disconnect feature preserves reservoir energy-key behaviors confirmed in the MAX1687EUE datasheet's Typical Operating Circuits and Timing Diagrams.
What package type is used for the MAX1687EUE, and what are its mechanical characteristics?
The MAX1687EUE uses a 16-pin thin-shrink small-outline package (TSSOP) with maximum height of 1.1mm, body dimensions 4.4mm × 5mm, and standard 0.65mm lead pitch. It features an exposed thermal pad (non-electrical) for improved heat dissipation. This package is explicitly listed in the MAX1687EUE Ordering Information table and Pin Configurations diagram, and is distinct from the SO-8 variant used by MAX1687ESA.
How does the MAX1687EUE achieve 90% conversion efficiency without an external Schottky diode?
The MAX1687EUE achieves up to 90% conversion efficiency by integrating synchronous rectification-using internal N-channel and P-channel MOSFETs as active switches instead of a lossy external Schottky diode. This eliminates forward-voltage drop (typically 0.3–0.4V) and associated conduction losses, particularly critical at high load currents. The integrated power MOSFETs and current-sense resistor are specified in the MAX1687EUE Features list and Electrical Characteristics table, confirming this architecture.
Can the MAX1687EUE operate with a single Li-Ion cell, and what is the minimum input voltage?
Yes, the MAX1687EUE is explicitly rated for operation from a single Li-Ion cell (2.7V to 4.2V), with a minimum input voltage of 2.7V. This is stated in both the General Description ("2.7V to 6V Input Range (1 Li-Ion cell or 3 NiMH cells)") and the Electrical Characteristics table, where parameters are guaranteed down to VIN = 2.7V. The device's undervoltage lockout threshold is 2.35V (min), ensuring reliable startup even near end-of-discharge.
MAX1687EUE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 730mA (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
MAX1687EUE FAQ
1.How can I place an order for MAX1687EUE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1687EUE 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 MAX1687EUE reliable?
The price and inventory of MAX1687EUE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1687EUE is usually 5 days.
3.What payment methods are accepted for MAX1687EUE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1687EUE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1687EUE?
MAX1687EUE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1687EUE 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 MAX1687EUE?
For technical support, including MAX1687EUE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1687EUE requirements.
6.How does Aetrix verify that MAX1687EUE is sourced from the original manufacturer or authorized distributors?
All MAX1687EUE 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 MAX1687EUE meets industry standards.
7.What is the process for return or replacement of MAX1687EUE?
All MAX1687EUE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1687EUE, 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 MAX1687EUE part is unused and in its original packaging.
Return procedure for MAX1687EUE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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