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Analog Devices Inc./Maxim Integrated MAX1759EUB+
- Part No.:
- MAX1759EUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1759EUB+.pdf
- Description:
- IC REG CHRG PUMP ADJ/3.3V 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
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Product details
Overview
The MAX1759EUB+ from Maxim Integrated is a buck/boost regulating charge-pump DC-DC converter designed for single-cell Li+ or multi-cell NiMH/alkaline battery-powered portable equipment. It delivers a regulated 3.3V (fixed) or adjustable 2.5V–5.5V output, supports 1.6V–5.5V input, guarantees ≥100mA output current at 3.3V from 2.5V input, and operates at 1.5MHz with only 50µA quiescent current - enabling compact, low-power handheld applications.
For engineers reviewing the MAX1759EUB+ datasheet, MAX1759EUB+ pinout, MAX1759EUB+ application, or MAX1759EUB+ equivalent, key selection criteria include its dual-mode feedback architecture, open-drain POK signal, shutdown isolation of OUT from IN, thermal shutdown with 20°C hysteresis, and µMAX package compatibility with space-constrained PCB layouts.
Technical Context
The MAX1759EUB+ implements a proprietary charge-pump topology that autonomously selects between step-up (voltage-doubling) and step-down (gated-switch) modes based on real-time comparison of VIN and VOUT. Internal sensing of FB voltage (1.235V nominal) and POK trip threshold (1.1V) enables regulation without external compensation.
Its control logic integrates undervoltage lockout (1.0V threshold), foldback short-circuit protection (110mA typical limit), and soft-start via inrush current limiting. The 1.5MHz oscillator allows use of small 0.33µF ceramic transfer capacitors and minimizes output ripple - especially in step-down mode where ripple is significantly lower than in doubler mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.6V to +5.5V - supports full discharge range of single Li+ (2.7V–4.2V) and two/three alkaline/NiMH cells. |
| Output Voltage | Fixed 3.3V ±3.5% or adjustable 2.5V–5.5V - set via FB pin tied to GND (fixed) or external resistor divider (adjustable). |
| Max Output Current | 100mA (min) continuous at 3.3V from 2.5V input - guaranteed across -40°C to +85°C operating temperature. |
| Quiescent Current | 50µA typical - enables >1-year battery life in always-on sensor nodes powered by coin cells. |
| Shutdown Current | 1µA - disconnects OUT from IN and disables all switching, preserving battery during standby. |
| Switching Frequency | 1.5MHz (1.2–1.8MHz range) - permits use of sub-1µF ceramic capacitors and reduces EMI filtering burden. |
| POK Output | Open-drain, active-low when VFB < 1.1V - provides system-level power-good monitoring with external pull-up to VOUT. |
Pinout & Package
The MAX1759EUB+ is housed in a 10-pin µMAX package (3mm × 3mm, 1.09mm height), pin-compatible with industry-standard 10LUMAX footprint and compatible with reflow soldering. No exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - POK | Open-drain Power-OK output | Sinks current when FB falls below 1.1V; requires external pull-up (10kΩ–1MΩ) to VOUT for logic-level signaling. |
| 2 - SHDN | Active-high shutdown control | Drive ≥0.7·VIN high for operation; drive ≤0.2·VIN low to enter 1µA shutdown with OUT disconnected from IN. |
| 3,4 - IN | Main input supply terminals | Both pins must be connected together and bypassed to PGND with ≥10µF low-ESR ceramic capacitor. |
| 5 - GND | Analog ground reference | Must be short-traced to PGND; separates analog feedback path from high-current power return. |
| 6 - PGND | Power ground return | Carries charge-pump switching current; connects directly to CIN and CXN capacitor grounds. |
| 7 - CXN | Negative terminal of transfer capacitor | Connects to negative side of 0.33µF ceramic CX capacitor; forms flying capacitor node for charge transfer. |
| 8 - CXP | Positive terminal of transfer capacitor | Connects to positive side of CX; alternately switched between IN and OUT to pump charge. |
| 9 - OUT | Regulated power output | Delivers up to 100mA; bypassed to PGND with ≥10µF low-ESR ceramic capacitor for ripple suppression. |
| 10 - FB | Dual-mode feedback input | Tied to GND for 3.3V fixed output; connected to resistor divider (R1/R2) for 2.5V–5.5V adjustable output (VFB = 1.235V). |
Key Features
| Feature | Design Value |
|---|---|
| Buck/boost charge-pump architecture | Automatically switches between step-up (doubling) and step-down (gated-switch) modes without external mode control. |
| Dual-mode feedback (Dual Mode™) | Single FB pin supports either fixed 3.3V output (FB = GND) or adjustable 2.5V–5.5V output (external divider), simplifying BOM management. |
| Thermal shutdown with hysteresis | Shuts down at 160°C and restarts at 140°C - prevents latch-up during sustained overload while enabling self-recovery. |
| Foldback short-circuit protection | Limits peak output current to 110mA (typ) and reduces duty cycle under short-circuit, protecting CX capacitor and internal switches. |
| Low-noise 1.5MHz operation | Enables use of small, low-ESR ceramic capacitors (CIN/CX/COUT ≤10µF) and eases EMI filtering in RF-sensitive designs. |
Applications
| Wearable Health Monitors | Bluetooth Low Energy Peripherals |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) powered by a single CR2032 coin cell with 2.0V–3.0V discharge profile. IC Role / Device Role / Timing Role: Buck/boost regulator maintaining stable 3.3V rail for BLE SoC and sensor interface despite falling input voltage. Use Value: Enables >12-month battery life via 50µA quiescent current and 1µA shutdown, while supporting dynamic load steps up to 100mA during radio transmission. |
Use Scenario: Wireless keyboard using two AAA alkaline cells (1.8V–3.2V) powering an ultra-low-power MCU and RF transceiver. IC Role / Device Role / Timing Role: Adjustable-output charge pump delivering 2.8V to match MCU core voltage, reducing leakage vs. 3.3V operation. Use Value: Dual-mode feedback allows one BOM variant to support multiple MCU voltage requirements without redesigning power stage. |
| Industrial Sensor Nodes | Medical Diagnostic Handhelds |
Use Scenario: Battery-backed environmental sensor node with intermittent wake-up, requiring reliable start-up down to 1.6V input. IC Role / Device Role / Timing Role: Primary DC-DC converter providing regulated 3.3V to microcontroller and ADC, with POK signaling system readiness. Use Value: Undervoltage lockout (1.0V) and guaranteed start-up at 1.65V ensure operation across full battery discharge, while POK eliminates software polling delays. |
Use Scenario: Portable pulse oximeter using single Li+ cell (2.7V–4.2V) powering LED drivers, analog front-end, and display controller. IC Role / Device Role / Timing Role: High-efficiency buck/boost regulator supplying clean 3.3V rail with minimal ripple (<40mV at 100mA) for noise-sensitive analog circuits. Use Value: 1.5MHz switching and ceramic-only design suppresses switching artifacts in photodiode signal path, improving SpO₂ accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck/boost charge-pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60151DRVR | Fixed 3.3V output only; 100mA max; 1.2MHz switching; no POK or thermal shutdown. | Lacks power-good signaling and overtemperature protection - unsuitable for safety-critical medical devices. | Select when POK and thermal protection are not required and board space allows larger 8-pin VSON package. |
| LT3467EDD#TRPBF | Adjustable 2.5V–5.5V output; 120mA max; 1.3MHz; includes POK but no thermal shutdown; requires external diodes. | Higher output current but uses external Schottky diodes - increases BOM count and footprint vs. fully integrated MAX1759EUB+. | Select when >100mA output is mandatory and layout allows discrete diode placement near IC. |
Compared with TPS60151DRVR and LT3467EDD#TRPBF, the MAX1759EUB+ uniquely combines dual-mode feedback, integrated thermal shutdown with hysteresis, and open-drain POK in a 10-pin µMAX package - offering the highest integration level for space-constrained, battery-powered systems requiring robust power sequencing and fault reporting.
Availability
The MAX1759EUB+ is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE peripherals, industrial sensor nodes, medical diagnostic handhelds, and backup battery boost converters requiring stable component supply across extended product lifecycles.
Supply support for MAX1759EUB+ 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, medical, and consumer applications.
The MAX1759EUB+ belongs to Maxim's regulated charge-pump DC-DC converter product line, engineered specifically for ultra-compact, low-quiescent-current power conversion in single-cell battery-powered portable electronics.
FAQ
What output voltage options does the MAX1759EUB+ support?
The MAX1759EUB+ supports two output configurations: a fixed 3.3V output (±3.5%) achieved by tying the FB pin to GND, or an adjustable output from 2.5V to 5.5V set via an external resistor divider connected to FB. The internal feedback reference is 1.235V, and the divider current should be ~15µA for optimal accuracy and stability. This dual-mode capability is implemented in the MAX1759EUB+ without external mode-select pins.
How does the MAX1759EUB+ handle input voltages both above and below the output voltage?
The MAX1759EUB+ uses an autonomous charge-pump architecture that senses VIN and VOUT in real time to select between step-up (voltage-doubling) and step-down (gated-switch) operation. When VIN < VOUT, it operates as a regulated doubler; when VIN > VOUT, it functions as a step-down switcher - reverting to doubler mode only if regulation cannot be maintained under load. This behavior is intrinsic to the MAX1759EUB+ and requires no external control.
What is the purpose and electrical behavior of the POK pin on the MAX1759EUB+?
The POK pin on the MAX1759EUB+ is an open-drain output that signals power-good status: it remains high-impedance when VFB ≥ 1.1V (output in regulation), and sinks current when VFB falls below 1.1V. A pull-up resistor (10kΩ–1MΩ) to VOUT converts this into a logic-low fault signal. During MAX1759EUB+ shutdown, POK is also high-impedance - ensuring no unintended system reset.
Does the MAX1759EUB+ provide overtemperature protection, and how does it behave?
Yes, the MAX1759EUB+ includes thermal shutdown with 20°C hysteresis: it disables switching at 160°C junction temperature and automatically resumes operation once the die cools to 140°C. This feature is fully integrated and requires no external components. If the overload condition persists, the MAX1759EUB+ cycles on/off - producing a pulsed output rather than permanent latch-up.
What capacitor values are recommended for the MAX1759EUB+ in a 100mA, 3.3V application?
For a 100mA, 3.3V application with VIN = 2.5V, the MAX1759EUB+ datasheet specifies CIN = 10µF, CX = 0.33µF, and COUT = 10µF - all low-ESR ceramic capacitors (≤20mΩ). These values ensure ≤40mV output ripple and stable regulation. Using tantalum or aluminum electrolytic capacitors is discouraged due to higher ESR, which degrades ripple performance and efficiency in the MAX1759EUB+ design.
MAX1759EUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V (3.3V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 100mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX1759EUB+ FAQ
1.How can I place an order for MAX1759EUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1759EUB+ 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 MAX1759EUB+ reliable?
The price and inventory of MAX1759EUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1759EUB+ is usually 5 days.
3.What payment methods are accepted for MAX1759EUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1759EUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1759EUB+?
MAX1759EUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1759EUB+ 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 MAX1759EUB+?
For technical support, including MAX1759EUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1759EUB+ requirements.
6.How does Aetrix verify that MAX1759EUB+ is sourced from the original manufacturer or authorized distributors?
All MAX1759EUB+ 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 MAX1759EUB+ meets industry standards.
7.What is the process for return or replacement of MAX1759EUB+?
All MAX1759EUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1759EUB+, 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 MAX1759EUB+ part is unused and in its original packaging.
Return procedure for MAX1759EUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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