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Analog Devices Inc./Maxim Integrated MAX1688EUE+T
- Part No.:
- MAX1688EUE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1688EUE+T.pdf
- Description:
- IC REG BOOST ADJ 730MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,956
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Product details
Overview
MAX1688EUE+T from Maxim Integrated is a step-up DC-DC converter optimized for GSM RF power amplifier burst-load applications, delivering up to 2W from 2.7V–6V input (single Li-Ion or three NiMH cells), featuring adaptive constant-recharge-time current limiting, 90% peak efficiency, and 3µA shutdown current. It reduces battery surge current by charging a reservoir capacitor between bursts, minimizing voltage sag in handheld wireless transmitters.
For engineers reviewing the MAX1688EUE+T datasheet, MAX1688EUE+T pinout, MAX1688EUE+T application, or MAX1688EUE+T equivalent, key selection criteria include its 16-pin TSSOP package, 1.25V–6V adjustable output, synchronous rectification eliminating external Schottky diodes, and precise control of peak battery current during 12% duty-cycle GSM bursts.
Technical Context
The MAX1688EUE+T implements hysteretic inductor-current control with peak current set via the CHG pin using an external resistor, enabling self-regulating recharge of the output reservoir capacitor in fixed time-compensating for input voltage variation and capacitor ESR drift. Its dual-MOSFET synchronous architecture integrates both P-channel and N-channel power switches with internal current-sense resistor.
It supports synchronized standby mode: driving the ON pin low during RF transmit intervals disconnects the input, silences switching noise, and allows the reservoir capacitor to supply burst load current. Startup employs four phased operation (Linear → Pseudo Buck → Pseudo Boost → Boost) to limit inrush current and stabilize VOUT slope.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - supports single Li-Ion (2.7–4.2V), three NiMH (3.0–4.5V), or three alkaline cells without external regulation. |
| Output Voltage Range | 1.25V to 6V - set externally via FB resistor divider; regulated to ±2.3% over temperature and line/load. |
| Peak Efficiency | 90% - achieved at 5V output, 3.3V input, and 1A GSM burst load; enables thermal management in space-constrained handsets. |
| Shutdown Current | 3µA - ultra-low quiescent draw during OFF state; extends shelf life and standby runtime in always-on devices. |
| Switching Frequency | Exceeds 1MHz - determined by inductor value and load; permits use of small, low-profile 10µH inductors (e.g., 150kHz–1MHz typical range). |
| Peak Battery Current | 450mA - measured at 5V/2A GSM burst; limited adaptively to maximize battery cycle life and minimize voltage droop. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade handset and PCMCIA card environments. |
Pinout & Package
MAX1688EUE+T is housed in a 16-pin thin-shrink TSSOP (1.1mm max height), thermally enhanced for high-current DC-DC operation in portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Supply Input | Battery connection point; requires ≥47µF low-ESR bypass capacitor to PGND to suppress ripple and sustain peak current. |
| OUT | Regulated Output | High-current output node feeding reservoir capacitor and RF PA; must be routed with low-inductance path to minimize voltage droop. |
| LX1 / LX2 | Switch Node Pair | LX1 connects to inductor high-side; LX2 is drain of integrated N- and P-channel MOSFETs - forms synchronous boost switch node. |
| PGND | Power Ground | High-current return path for LX1/LX2 and output capacitor; isolated from AGND to reduce ground bounce in RF-sensitive layouts. |
| AGND | Analog Ground | Reference for FB, REF, CHG, and internal error amplifier; tied to PGND only at single star point near IN bypass cap. |
| FB | Feedback Input | Senses output voltage via resistor divider; regulates to 1.25V nominal; transconductance gmFB = 0.2 mmho ensures stable loop response. |
| REF | Reference Output | 1.25V ±2.3% precision reference; supplies ≤10µA - usable to bias LIM resistor divider in TSSOP packages. |
| ON | Logic Control | Active-high enable; low pulse >1.2ms triggers 3µA shutdown; synchronizes standby during RF transmit to eliminate switching noise coupling. |
| CHG | Recharge Timer | Accepts external resistor to GND; sets constant-recharge-time algorithm - adjusts peak inductor current based on VOUT droop magnitude. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Constant-Recharge-Time Algorithm | Self-adjusts peak inductor current based on real-time VOUT sag, maintaining consistent recharge time across varying battery voltage and capacitor aging. |
| Integrated Synchronous Rectifier | Eliminates external Schottky diode - reduces conduction loss and board area; enables >90% efficiency without thermal derating. |
| Four-Phase Soft-Start Sequence | Prevents inrush current spikes during power-up by sequencing through Linear → Pseudo Buck → Pseudo Boost → Boost modes. |
| Output Disconnect in Shutdown | Internal switch isolates OUT from IN during shutdown - prevents reverse current flow and protects downstream circuitry. |
| Hysteretic Inductor Current Control | Maintains tight 200mA ripple band around programmed IPEAK - simplifies compensation and improves transient response to burst loads. |
Applications
| GSM Mobile Handsets | Wireless LAN PC Cards (PCMCIA) |
|---|---|
Use Scenario: Powering RF power amplifier during 12% duty-cycle GSM transmit bursts requiring 2A peak at 5V from a single Li-Ion cell. IC Role / Device Role / Timing Role: Step-up DC-DC converter with synchronized standby mode; disables switching during RF transmit to prevent noise injection into sensitive PA stages. Use Value: Limits peak battery current to 450mA while delivering 2A bursts - extends battery life and avoids system reset due to voltage sag. | Use Scenario: Providing regulated 3.3V or 5V to WLAN baseband ICs and RF front-end in hot-pluggable PCMCIA cards. IC Role / Device Role / Timing Role: High-efficiency boost regulator with low shutdown current; powers card logic during insertion and maintains reserve energy in reservoir capacitor. Use Value: 3µA shutdown current enables long-term storage without battery drain; TSSOP package fits narrow PCMCIA Type II form factor. |
| Industrial Telematics Modules | Portable Medical Data Transmitters |
Use Scenario: Supplying burst power to cellular modem (LTE/GSM) in vehicle-mounted asset trackers operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Wide-input, temperature-hardened boost converter; adapts recharge timing to compensate for cold-temperature battery impedance rise. Use Value: Adaptive CHG algorithm maintains consistent burst performance despite VIN drop to 2.7V and VOUT droop up to 360mV at –40°C. | Use Scenario: Delivering short-duration 5V pulses to Bluetooth LE or Zigbee radio in battery-powered patient monitors and ECG transmitters. IC Role / Device Role / Timing Role: Low-noise, low-quiescent boost IC; enters standby during radio transmission to avoid interference with analog sensor front-end. Use Value: Output disconnect and <1.2ms shutdown delay ensure clean RF envelope - critical for meeting FCC Part 15 radiated emission limits. |
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 |
|---|---|---|---|
| MAX1687EUE+T | Uses voltage-controlled LIM pin instead of CHG; lacks adaptive recharge algorithm; peak current set manually via 0–1V analog input. | Best for microcontroller-controlled systems where burst profile is known and fixed; less effective under variable battery voltage or aging capacitors. | Select MAX1687EUE+T when precise programmable current limiting is required and system firmware can manage recharge timing. |
| TPS61088RHLR | Higher 2.5A output capability; fixed 500kHz switching; no adaptive recharge or GSM-specific standby sync; requires external compensation. | Targeted at general boost applications (USB PD, displays); lacks ON-pin synchronization for RF burst noise suppression. | Choose TPS61088RHLR for higher continuous load demands (>1A) where GSM burst optimization is not required. |
Compared with MAX1687EUE+T, the MAX1688EUE+T delivers superior battery life in GSM applications via autonomous recharge timing, while TPS61088RHLR offers higher output current but no RF-noise-aware control - making MAX1688EUE+T the optimal choice for burst-dominated wireless transceivers.
Availability
MAX1688EUE+T is available at Aetrix Electronics and suitable for GSM mobile handsets, wireless PCMCIA cards, industrial telematics modules, and portable medical transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1688EUE+T 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 industrial, communications, and consumer applications.
The MAX1687/MAX1688 product line was designed specifically for GSM/EDGE RF power amplifier supply in battery-powered handhelds - prioritizing low-battery-current burst delivery, noise-free RF operation, and adaptive energy recovery.
FAQ
What is the primary function of the CHG pin on the MAX1688EUE+T?
The CHG pin on the MAX1688EUE+T sets the constant-recharge-time algorithm by connecting an external resistor to ground. It enables the IC to sample output voltage sag after each RF burst and autonomously adjust peak inductor current to restore VOUT within a fixed time - optimizing battery current usage across varying input voltage and capacitor ESR. This behavior is unique to the MAX1688EUE+T and not present in the MAX1687EUE+T.
Can the MAX1688EUE+T operate with a 2.7V input from a single Li-Ion cell?
Yes, the MAX1688EUE+T operates across 2.7V to 6V input, fully supporting single Li-Ion cells (2.7–4.2V nominal). At 2.7V input, it delivers up to 2A at 5V output during GSM bursts with 450mA peak battery current, and maintains regulation down to –40°C. The adaptive CHG algorithm compensates for increased battery impedance at low voltage, preserving burst performance throughout discharge.
How does the MAX1688EUE+T reduce RF interference during GSM transmission?
The MAX1688EUE+T reduces RF interference by synchronizing its ON pin to the GSM transmit interval: driving ON low places the IC in standby mode, halting switching activity and disconnecting the input from the output. During this period, the reservoir capacitor alone powers the RF PA - eliminating switching noise coupling into sensitive RF paths. This feature is explicitly designed into the MAX1688EUE+T's control architecture and verified in GSM pulsed-load waveforms.
What is the recommended output capacitor value for a 5V/2A GSM burst application using the MAX1688EUE+T?
For a 5V/2A GSM burst (12% duty cycle, 4.62ms pulse width), the recommended output capacitor is 2000µF with ≤10mΩ ESR - as shown in the MAX1688EUE+T typical application circuit (Figure 7). This value limits VOUT droop to <10% (≤500mV) during burst. Lower ESR further reduces droop; ceramic + polymer hybrid configurations are preferred to meet ripple and surge current requirements without excessive size.
Does the MAX1688EUE+T require an external Schottky diode?
No, the MAX1688EUE+T does not require an external Schottky diode. It integrates synchronous rectification using internal P-channel and N-channel MOSFETs, achieving >90% efficiency and eliminating diode forward-voltage loss and associated thermal concerns. This integration is confirmed in the device's functional diagram, electrical characteristics (no diode-drop specification), and typical application schematics.
MAX1688EUE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- 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
MAX1688EUE+T FAQ
1.How can I place an order for MAX1688EUE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1688EUE+T 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 MAX1688EUE+T reliable?
The price and inventory of MAX1688EUE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1688EUE+T is usually 5 days.
3.What payment methods are accepted for MAX1688EUE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1688EUE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1688EUE+T?
MAX1688EUE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1688EUE+T 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 MAX1688EUE+T?
For technical support, including MAX1688EUE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1688EUE+T requirements.
6.How does Aetrix verify that MAX1688EUE+T is sourced from the original manufacturer or authorized distributors?
All MAX1688EUE+T 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 MAX1688EUE+T meets industry standards.
7.What is the process for return or replacement of MAX1688EUE+T?
All MAX1688EUE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1688EUE+T, 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 MAX1688EUE+T part is unused and in its original packaging.
Return procedure for MAX1688EUE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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