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Analog Devices Inc./Maxim Integrated MAX1595EUA33+
- Part No.:
- MAX1595EUA33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1595EUA33+.pdf
- Description:
- IC REG CHG PUMP 3.3V 125MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:128
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Product details
Overview
MAX1595EUA33+ from Maxim Integrated is a regulated 3.3V step-up/step-down charge-pump DC-DC converter supporting 1.8V–5.5V input, delivering up to 75mA output current with ±3% regulation accuracy, 1MHz fixed-frequency switching, and 220µA no-load quiescent current. It serves as a compact auxiliary supply in battery-powered miniature equipment requiring efficient local voltage conversion without inductors.
For engineers reviewing the MAX1595EUA33+ datasheet, MAX1595EUA33+ pinout, MAX1595EUA33+ application, or MAX1595EUA33+ equivalent, key selection considerations include its dual-mode (boost/buck) operation, ceramic-capacitor-only design (3× external), load-disconnect capability during shutdown, and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX1595EUA33+ implements a constant-frequency charge-pump architecture with adaptive mode control: it operates in boost mode when VIN < VOUT and transitions to buck mode when VIN exceeds VOUT by ≥0.7V. Its internal error amplifier compares AOUT-sensed output against a 1.23V bandgap reference through an integrated resistive divider to maintain regulation.
Switching is managed by high-current MOSFETs (S1/S2) driving CXN/CXP terminals; charge transfer occurs at 1MHz with 50% duty cycle in heavy-load conditions, while light loads trigger low-power mode for efficiency optimization. Undervoltage lockout activates below 1.6V (40mV hysteresis), and shutdown disables all switching while disconnecting OUT from IN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% - ensures stable bias for 3.3V logic, flash memory, and white LED strings without external feedback. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.7–4.2V), NiMH (1.8–3.0V), and 3.3V/5V system rails. |
| Max Output Current | 75mA at 3.3V - sufficient for powering 3–5 white LEDs or small microcontroller peripherals. |
| Switching Frequency | 1.0MHz typical - enables use of 0.22µF ceramic transfer capacitor and 1µF output capacitor, minimizing board area. |
| Quiescent Current | 220µA at no load - extends battery life in always-on portable devices. |
| Shutdown Current | 0.1µA - fully isolates output and halts switching to eliminate standby power loss. |
| Regulation Accuracy | ±3% over -40°C to +85°C - meets tight tolerance requirements for precision analog and digital subsystems. |
Pinout & Package
MAX1595EUA33+ uses the 8-pin µMAX package (2.1mm × 2.1mm, 0.5mm pitch), featuring exposed thermal pad on TQFN variants only - not present in µMAX. Pin 1 is AOUT; pins 5 and 6 are separate PGND and GND connections for noise isolation between analog and power return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AOUT | Analog sense input | Connects directly to output capacitor's positive terminal for accurate remote sensing and ripple rejection. |
| SHDN | Digital enable control | Active-high logic input; pulls low to enter 0.1µA shutdown with automatic output disconnect. |
| IN | Main power input | Accepts 1.8–5.5V supply; requires 1µF ceramic bypass to GND adjacent to pin. |
| GND | Analog ground reference | Reference for error amplifier and bandgap; must be routed separately from PGND to minimize noise coupling. |
| PGND | Power ground return | Return path for charge-pump switching currents; connects to CIN and COUT negative terminals. |
| CXN | Negative transfer node | Connects to negative terminal of 0.22µF ceramic transfer capacitor (CX). |
| CXP | Positive transfer node | Connects to positive terminal of CX; switches between IN and OUT depending on operating mode. |
| OUT | Regulated output | Delivers 3.3V ±3%; requires 1µF ceramic output capacitor connected between OUT and PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components and EMI concerns - ideal for RF-sensitive handheld designs. |
| Buck-boost dual-mode operation | Maintains regulation across input voltages both below and above 3.3V, enabling single-supply flexibility in variable-battery systems. |
| Load disconnect in shutdown | Prevents backfeed from output to input rail, protecting upstream sources and enabling safe hot-swap operation. |
| Ultra-low shutdown current | 0.1µA draw allows multi-year battery life in maintenance-free IoT sensor nodes. |
| Thermal-enhanced µMAX package | θJA = 206.3°C/W enables 75mA continuous operation at +70°C ambient without heatsinking. |
Applications
| White LED Backlighting | Flash Memory Supply |
|---|---|
Use Scenario: Powering 3–4串联 white LEDs in portable LCD displays powered by single-cell Li-ion batteries (2.7–4.2V). IC Role / Device Role / Timing Role: Regulated 3.3V charge-pump supply providing constant current drive via external current-setting resistor. Use Value: Maintains consistent brightness across full battery discharge curve without requiring inductor-based boost converters. | Use Scenario: Providing clean 3.3V VCC to NAND/NOR flash memory in PCMCIA cards and embedded storage modules. IC Role / Device Role / Timing Role: Auxiliary voltage regulator ensuring stable programming/erase voltage during data writes. Use Value: Delivers low-noise 3.3V output with <70mV ripple (at 75mA), meeting JEDEC flash timing margin requirements. |
| Battery-Powered Miniature Equipment | 3.3V-to-5V Local Conversion |
Use Scenario: Compact medical sensors and wearable monitors operating from coin-cell or AAA batteries. IC Role / Device Role / Timing Role: Primary 3.3V system rail generator from 1.8–3.0V input, supporting ultra-low-quiescent microcontrollers. Use Value: 220µA no-load IQ and 0.1µA shutdown extend shelf life and operational runtime beyond competing solutions. | Use Scenario: Generating localized 5V supply from existing 3.3V system rail for USB interface ICs or legacy peripherals. IC Role / Device Role / Timing Role: Step-up charge pump converting 3.3V to regulated 5.0V output (using MAX1595EUA50+ variant); MAX1595EUA33+ supports reverse buck operation if 5V rail is available. Use Value: Enables mixed-voltage subsystems without dedicated buck-boost ICs or discrete FET-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1722EUA+ | 3.3V fixed-output, 100mA max, 1.2MHz, but boost-only (no buck mode); requires different capacitor values. | Lacks input voltage range flexibility below 2.0V and cannot regulate when VIN > VOUT. | Select MAX1722EUA+ only when strictly boosting from 2.0–5.5V and higher output current is required. |
| TPS60403DBVR | 3.3V fixed-output, 60mA max, 1MHz, boost-only, 2.5µA IQ - significantly higher quiescent current than MAX1595EUA33+. | No buck capability; unsuitable for applications where input may exceed 3.3V during brownout or rail-sharing scenarios. | Choose TPS60403DBVR only if TI supply chain preference or specific qualification requirements override efficiency and mode flexibility needs. |
Compared with MAX1722EUA+ and TPS60403DBVR, the MAX1595EUA33+ uniquely supports true buck-boost operation across 1.8–5.5V input, delivers tighter ±3% regulation, and achieves 220µA no-load IQ - making it optimal for battery-critical, space-constrained dual-mode power rails.
Availability
MAX1595EUA33+ is available at Aetrix Electronics and suitable for white LED backlighting, flash memory supplies, and battery-powered miniature equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1595EUA33+ 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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.
The MAX1595 product line targets compact, inductorless DC-DC conversion in portable and space-constrained systems - specifically engineered for high-efficiency, dual-mode (boost/buck) charge-pump regulation with minimal external components.
FAQ
What is the maximum continuous output current supported by the MAX1595EUA33+?
The MAX1595EUA33+ delivers up to 75mA of continuous output current at 3.3V while maintaining ±3% regulation across -40°C to +85°C. This rating assumes proper thermal layout with 1µF input and output ceramic capacitors and adherence to the µMAX package's 206.3°C/W junction-to-ambient thermal resistance limit. Exceeding 75mA risks thermal shutdown or reduced regulation accuracy.
Does the MAX1595EUA33+ require an inductor in its application circuit?
No, the MAX1595EUA33+ is an inductorless charge-pump regulator. It uses three external ceramic capacitors - 1µF input (CIN), 0.22µF transfer (CX), and 1µF output (COUT) - to achieve step-up/step-down conversion. This eliminates magnetic components, reduces EMI, and simplifies PCB layout compared to inductive DC-DC converters.
How does the MAX1595EUA33+ behave when the input voltage exceeds 3.3V?
When VIN exceeds approximately 4.0V (VOUT + diode drop), the MAX1595EUA33+ automatically enters buck mode: switch S1 remains continuously connected to IN, while S2 alternates between IN and OUT to transfer charge proportionally. This maintains regulated 3.3V output without dropout or inefficiency - a key differentiator from boost-only charge pumps.
What is the purpose of the separate GND and PGND pins on the MAX1595EUA33+?
The MAX1595EUA33+ separates analog ground (GND) and power ground (PGND) to isolate sensitive reference and error amplifier circuitry from high-current switching noise. GND serves as the reference for the 1.23V bandgap and AOUT sensing; PGND carries pulsed charge-pump return currents from CIN and COUT. Routing them separately prevents ground bounce from degrading regulation accuracy.
Can the MAX1595EUA33+ be used to power white LEDs directly?
Yes - the MAX1595EUA33+ is commonly used to bias white LED strings in portable displays. Its 3.3V output can drive 1–2 LEDs in series (VF ≈ 3.0–3.4V) with a simple current-limiting resistor. For higher LED counts, connect the MAX1595EUA33+ output to a constant-current LED driver IC. Ripple remains under 70mV at 75mA, ensuring flicker-free illumination.
MAX1595EUA33+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 125mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1595EUA33+ FAQ
1.How can I place an order for MAX1595EUA33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1595EUA33+ 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 MAX1595EUA33+ reliable?
The price and inventory of MAX1595EUA33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1595EUA33+ is usually 5 days.
3.What payment methods are accepted for MAX1595EUA33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1595EUA33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1595EUA33+?
MAX1595EUA33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1595EUA33+ 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 MAX1595EUA33+?
For technical support, including MAX1595EUA33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1595EUA33+ requirements.
6.How does Aetrix verify that MAX1595EUA33+ is sourced from the original manufacturer or authorized distributors?
All MAX1595EUA33+ 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 MAX1595EUA33+ meets industry standards.
7.What is the process for return or replacement of MAX1595EUA33+?
All MAX1595EUA33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1595EUA33+, 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 MAX1595EUA33+ part is unused and in its original packaging.
Return procedure for MAX1595EUA33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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