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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:4,518
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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 for low-power auxiliary supplies. It accepts 1.8V–5.5V input, delivers up to 75mA output current at ±3% regulation, operates at 1MHz, and requires only three ceramic capacitors-no inductor. It serves as a compact, high-efficiency voltage translator in battery-powered miniature equipment.
For engineers reviewing the MAX1595EUA33 datasheet, MAX1595EUA33 pinout, MAX1595EUA33 application, or MAX1595EUA33 equivalent, key selection criteria include input voltage range (1.8V–5.5V), fixed 3.3V output, shutdown current (0.1µA), load disconnect capability, and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX1595EUA33 implements a dual-mode switched-capacitor architecture that dynamically selects buck or boost operation based on input-to-output voltage relationship-enabling regulation even when VIN exceeds VOUT by >0.7V or falls below it. Its constant-frequency 1MHz oscillator transitions smoothly to pulse-skipping mode under light loads to maintain efficiency.
Internal circuitry includes a 1.23V bandgap reference, error amplifier with AOUT feedback sensing, high-current MOSFET switches (S1/S2), and integrated shutdown logic with soft-start (≤2ms). The device features undervoltage lockout (1.6V threshold, 40mV hysteresis) and load disconnect during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over -40°C to +85°C, 0–75mA load, enabling stable bias for 3.3V logic or analog circuitry. |
| Input Voltage Range | 1.8V to 5.5V-supports single-cell Li-ion (3.0–4.2V), two-cell alkaline (2.4–3.2V), or partially discharged NiMH (1.8V+). |
| Max Output Current | 75mA at 3.3V output-sufficient for powering small microcontrollers, sensors, or flash memory I/O interfaces. |
| Switching Frequency | 1.0MHz typical-permits use of 0.22µF ceramic transfer capacitor and 1µF output capacitor, minimizing board area. |
| Quiescent Current | 220µA typical at VIN = 2.0V-ensures minimal battery drain during active operation in portable devices. |
| Shutdown Current | 0.1µA-enables true zero-load power-off state with automatic load disconnect from IN to OUT. |
| Thermal Resistance θJA | 206.3°C/W (µMAX-8)-requires moderate copper pour for thermal management at full load in ambient ≤70°C. |
Pinout & Package
MAX1595EUA33 is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height, exposed pad not electrically connected), optimized for high-density portable designs. Pin 1 is AOUT; pin 2 is SHDN; pins 3 and 8 are IN and OUT respectively; GND (pin 4) and PGND (pin 5) are separate ground returns for analog and power paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AOUT | Analog power/sense input to error amplifier | Must connect directly to OUT at output capacitor's ground side-critical for accurate feedback and ripple rejection. |
| SHDN | Digital enable/disable control input | Active-high logic: ≥1.6V enables regulation; ≤0.6V forces 0.1µA shutdown with internal load disconnect. |
| IN | Main power input supply | Accepts 1.8–5.5V; requires local 1µF ceramic bypass to GND (pin 4) close to the package. |
| GND | Analog ground reference | Return path for AOUT, SHDN, and internal bandgap-must be star-connected to avoid noise coupling. |
| PGND | Power ground return | High-current return for CXN/CXP switching nodes and OUT capacitor-separate from GND to reduce ground bounce. |
| CXN | Negative terminal of charge-transfer capacitor | Connects to 0.22µF ceramic capacitor's negative side; switches between IN and PGND during cycle. |
| CXP | Positive terminal of charge-transfer capacitor | Connects to same 0.22µF capacitor's positive side; switches between IN and OUT to pump charge. |
| OUT | Regulated 3.3V output | Delivers up to 75mA; must be bypassed with 1µF ceramic capacitor to PGND (not GND) for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Buck-boost charge-pump topology | Enables regulation across VIN < VOUT (boost) and VIN > VOUT (buck) without external inductors-ideal for variable-battery systems. |
| Three-ceramic-capacitor solution | Eliminates magnetic components: CIN = 1µF, CX = 0.22µF, COUT = 1µF-reduces BOM count, EMI, and footprint vs. inductive converters. |
| Load disconnect in shutdown | Internally opens the path from IN to OUT during SHDN = low-prevents backfeed and preserves battery charge in standby. |
| 1.23V internal bandgap reference | Provides stable voltage reference for error amplifier-ensures ±3% output accuracy across temperature and line/load variations. |
| Soft-start on enable | Limits inrush current by ramping output over ≤2ms-avoids supply droop and prevents false triggering of downstream UVLO circuits. |
Applications
| White LED Backlighting | Flash Memory Power Supply |
|---|---|
Use Scenario: Driving 1–3 white LEDs (VF ≈ 3.0–3.6V) from a 2.4–3.6V lithium coin cell or single Li-ion battery in handheld medical devices. IC Role / Device Role / Timing Role: Regulated 3.3V charge-pump source providing constant-current LED bias via external resistor or current-sink IC. Use Value: Eliminates need for inductor-based boosters-reducing EMI, board area, and cost while maintaining consistent brightness across battery discharge. | Use Scenario: Supplying 3.3V VCC_IO to NAND/NOR flash memory in ultra-thin IoT edge nodes where PCB real estate is constrained. IC Role / Device Role / Timing Role: Auxiliary voltage rail generator ensuring compliant I/O voltage during read/write cycles independent of main system rail. Use Value: Delivers clean, regulated 3.3V at up to 75mA with <10mV ripple-meets JEDEC JESD8-12A noise requirements for reliable flash programming. |
| PCMCIA/CardBus Interface | 3.3V-to-5V Local Conversion |
Use Scenario: Providing isolated 3.3V power to PCMCIA card controllers in legacy industrial laptops operating from 5V main rails. IC Role / Device Role / Timing Role: Step-down charge-pump regulator converting 5V system rail to 3.3V logic supply with fast transient response. Use Value: Achieves buck operation with <100ns line-transient recovery-prevents data corruption during hot-plug events per PCMCIA spec. | Use Scenario: Generating localized 5.0V from a 3.3V system rail to drive legacy USB transceivers or RS-232 level shifters in embedded gateways. IC Role / Device Role / Timing Role: Step-up charge-pump converter delivering regulated 5.0V output using same MAX1595 family die (selectable via part number). Use Value: Enables mixed-voltage subsystems without dedicated 5V SMPS-reducing component count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1722EUA33+ | Inductor-based synchronous boost; 3.3V fixed; 150mA output; 1.5MHz switching; higher efficiency above 50mA. | Requires external inductor and diode; larger footprint; better suited for continuous high-current loads. | Select MAX1722EUA33+ when >75mA sustained current or >90% efficiency at medium load is required. |
| TPS60403DBVR | 3.3V fixed-output charge pump; 60mA max; 1MHz; 3-caps only; no buck capability; 2.5–5.5V input. | Limited to boost-only operation; lower output current; lacks VIN > VOUT regulation and load disconnect. | Select TPS60403DBVR only for simple boost-only 3.3V generation where buck mode and load isolation are unnecessary. |
Compared with MAX1595EUA33, MAX1722EUA33+ offers higher current and efficiency but adds inductor cost and size; TPS60403DBVR provides basic boost-only functionality with lower current and no buck capability-making MAX1595EUA33 the optimal choice for bidirectional voltage translation in space-limited, battery-sensitive designs.
Availability
MAX1595EUA33 is available at Aetrix Electronics and suitable for white LED backlighting, flash memory power supply, and PCMCIA interface applications requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.
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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX1595 belongs to Maxim's charge-pump DC-DC regulator product line, designed specifically for compact, inductorless voltage translation in battery-powered portable electronics where board space and quiescent power are critical constraints.
FAQ
What is the output voltage tolerance of the MAX1595EUA33 across temperature and load?
The MAX1595EUA33 delivers a fixed 3.3V output with ±3% regulation over the full -40°C to +85°C temperature range and 0–75mA load current. At 25°C, typical output is 3.33V; minimum is 3.16V and maximum is 3.44V under worst-case conditions. This tight tolerance ensures compatibility with 3.3V logic families and analog sensors without external trimming.
Does the MAX1595EUA33 support both step-up and step-down operation from a single input?
Yes, the MAX1595EUA33 supports true step-up (boost) and step-down (buck) operation automatically. When VIN < VOUT, it operates in boost mode; when VIN > VOUT by ≥0.7V, it switches to buck mode-maintaining 3.3V regulation without user intervention. This eliminates the need for external mode-selection circuitry in variable-input applications like multi-cell battery systems.
What external components are required to operate the MAX1595EUA33?
The MAX1595EUA33 requires exactly three external ceramic capacitors: a 1µF input capacitor (CIN) from IN to GND, a 0.22µF charge-transfer capacitor (CX) between CXP and CXN, and a 1µF output capacitor (COUT) from OUT to PGND. No inductor, diode, or resistive feedback network is needed-reducing BOM count and layout complexity.
How does the MAX1595EUA33 behave during shutdown?
When SHDN is pulled low (<0.6V), the MAX1595EUA33 enters shutdown mode, drawing only 0.1µA supply current. Crucially, it internally disconnects the OUT node from IN-preventing backfeed into the input supply. The output voltage decays passively through the load; no external discharge circuit is required for safe power sequencing.
Can the MAX1595EUA33 be used to power white LEDs directly?
Yes, the MAX1595EUA33 is commonly used to bias white LEDs in portable displays. Its 3.3V output matches typical LED forward voltage ranges when driven in series with a current-limiting resistor or external current sink. The 1MHz switching frequency ensures LED brightness modulation remains imperceptible, and its low quiescent current extends battery life in always-on backlight applications.
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:
- Bulk
- 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-µMAX
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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