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Analog Devices Inc./Maxim Integrated MAX1595ETC33+T
- Part No.:
- MAX1595ETC33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1595ETC33+T.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,782
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Product details
Overview
MAX1595ETC33+ 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 quiescent current. It serves as a compact auxiliary supply in battery-powered miniature equipment requiring local 3.3V generation without inductors.
For engineers reviewing the MAX1595ETC33+ datasheet, MAX1595ETC33+ pinout, MAX1595ETC33+ application, or MAX1595ETC33+ equivalent, key selection considerations include its buck-boost charge-pump topology, TQFN-EP thermal performance (θJA = 41°C/W), shutdown disconnect capability, and ceramic-capacitor-only external component requirement.
Technical Context
The MAX1595ETC33+ implements a dual-mode charge-pump architecture: in boost mode, it transfers charge from CX to COUT to raise VIN above VOUT; in buck mode, it continuously connects IN to S1 while modulating S2 between IN and OUT to regulate when VIN exceeds 3.3V by >0.7V. Regulation is maintained via an internal 1.23V bandgap reference and error amplifier sensing at AOUT.
Its control scheme delivers constant 1MHz operation under medium-to-heavy loads and transitions smoothly to low-power mode at light loads. The device integrates high-current MOSFET switches, soft-start (≤2ms), undervoltage lockout (1.6V threshold with 40mV hysteresis), and load disconnect during shutdown (0.1µA ISHDN).
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 logic-level rail generation. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, alkaline, and USB-supplied systems without external LDO pre-regulation. |
| Switching Frequency | 1.0MHz (±15%) - enables use of 0.22µF ceramic transfer capacitor and 1µF output capacitor, minimizing board area. |
| Quiescent Current | 220µA at VIN = 2.0V - extends battery life in always-on portable devices with infrequent load activation. |
| Shutdown Current | 0.1µA - ensures negligible drain during system sleep, critical for backup-battery and long-term storage applications. |
| Thermal Resistance θJA | 41°C/W (TQFN-EP) - allows 1951mW max power dissipation at TA = +70°C, supporting higher continuous loads than µMAX package. |
| Output Current Capability | 75mA at 3.3V output with VIN ≥ 2.0V - sufficient for powering small microcontrollers, sensors, or interface ICs in space-constrained designs. |
Pinout & Package
MAX1595ETC33+ is housed in a 12-pin TQFN-EP (3mm × 3mm, 0.5mm pitch) with exposed pad thermally connected to GND. The EP improves thermal performance and must be soldered to a large PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AOUT (Pin 1) | Analog power/sense node for error amplifier | Must connect directly to OUT at output capacitor's ground-side terminal to ensure accurate feedback and ripple rejection. |
| SHDN (Pin 2) | Digital enable/disable control input | Active-high logic; drives device into 0.1µA shutdown with automatic output disconnect from IN. |
| IN (Pins 3,4) | Main power input | Dual-pin configuration lowers impedance; requires 1µF ceramic bypass to PGND/GND near pins. |
| GND (Pin 5) | Analog ground reference | Separate from PGND; connects to signal ground plane and AOUT return path. |
| PGND (Pins 6,7) | Power ground return | Low-impedance return for switch currents; must tie to IN and CXN/CXP ground paths with short traces. |
| CXN (Pins 8,9) | Negative terminal of charge-transfer capacitor | Connects to negative side of 0.22µF ceramic CX; routing must minimize loop area with CXP. |
| CXP (Pin 10) | Positive terminal of charge-transfer capacitor | Connects to positive side of CX; forms high-frequency switching node with CXN and internal MOSFETs. |
| OUT (Pins 11,12) | Regulated 3.3V output | Dual-pin layout reduces IR drop; requires 1µF ceramic COUT placed adjacent to pins with low-ESR design. |
Key Features
| Feature | Design Value |
|---|---|
| No inductor required | Enables ultra-compact, EMI-quiet DC-DC conversion using only three ceramic capacitors - ideal for PCMCIA, SIM cards, and wearable electronics. |
| Buck-boost charge-pump topology | Maintains 3.3V regulation whether input is below (e.g., 1.8V LiFePO₄) or above (e.g., 5V USB) output - eliminates need for separate buck/boost ICs. |
| Load disconnect in shutdown | Prevents backfeed from output to input during system sleep, protecting upstream sources and enabling true zero-power standby modes. |
| Exposed thermal pad (EP) | Reduces junction-to-ambient thermal resistance to 41°C/W, allowing sustained 75mA output at ambient temperatures up to +70°C. |
| Soft-start and UVLO | 2ms soft-start prevents inrush current; 1.6V UVLO with 40mV hysteresis avoids brownout oscillation during battery discharge. |
Applications
| White LED Backlighting | Flash Memory Supply |
|---|---|
|
Use Scenario: Powering 2–3 white LEDs in handheld medical monitors or barcode scanners with single-cell 2.4–3.6V Li-ion battery. IC Role / Device Role / Timing Role: Regulated 3.3V auxiliary supply providing stable bias voltage independent of battery voltage decay. Use Value: Enables constant LED brightness across full battery discharge curve without PWM dimming or external current regulation. |
Use Scenario: Supplying 3.3V VCC to NAND/NOR flash memory in industrial data loggers operating from 2.7–5.5V wide-input rails. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring clean, noise-immune voltage for flash I/O and core logic during read/write cycles. Use Value: Eliminates need for bulky inductor-based converters, reducing BOM cost and PCB footprint while maintaining <10mV output ripple. |
| PCMCIA Card Power | GSM SIM Card Boost |
|
Use Scenario: Generating 3.3V from 5V PCMCIA slot for legacy 3.3V peripheral cards in ruggedized field laptops. IC Role / Device Role / Timing Role: Buck-mode charge pump converting 5V slot power to regulated 3.3V with minimal heat rise in confined card-edge space. Use Value: Achieves >85% efficiency at 50mA load without magnetic components - avoids EMI interference with host bus signaling. |
Use Scenario: Boosting 3V SIM card supply to 3.3V for secure element communication in GSM handsets with aging battery packs. IC Role / Device Role / Timing Role: Step-up regulator maintaining compliant 3.3V I/O voltage even as battery sags to 2.8V during transmit bursts. Use Value: Prevents SIM authentication failures by guaranteeing ±3% output regulation down to 1.8V input, per ETSI TS 102 221. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1595EUA33+ | Same 3.3V regulation, but in 8-pin µMAX package (θJA = 206°C/W); lower max output current (75mA vs. same spec, but derated due to thermal limits). | Suitable for lower-power, space-constrained layouts where thermal budget permits; not recommended for continuous >30mA loads at TA > 50°C. | Select MAX1595EUA33+ only if board area is more critical than thermal headroom and peak load remains ≤30mA. |
| TPS60403DBVR | 3.3V fixed-output, 60mA max, 1MHz, but uses different control architecture (pulse-skipping); no buck capability - input must be <3.3V. | Limited to pure boost applications; lacks input undervoltage lockout hysteresis and AOUT-sense precision of MAX1595ETC33+. | Choose TPS60403DBVR only for simple boost-only use cases with strict 60mA limit and no need for buck operation or tight line/load regulation. |
Compared with MAX1595EUA33+, the MAX1595ETC33+ offers superior thermal performance and higher sustainable output current in demanding environments; versus TPS60403DBVR, it provides true buck-boost flexibility, tighter regulation, and robust shutdown behavior - making it the preferred choice for mixed-input-voltage embedded systems.
Availability
MAX1595ETC33+ is available at Aetrix Electronics and suitable for white LED backlighting, flash memory supplies, and PCMCIA card power applications requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.
Supply support for MAX1595ETC33+ 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 product line delivers compact, inductorless DC-DC conversion for battery-powered portable electronics - designed specifically to replace discrete charge-pump circuits and reduce solution size in space-constrained applications like SIM cards and handheld instruments.
FAQ
What is the maximum continuous output current for MAX1595ETC33+ at 3.3V?
The MAX1595ETC33+ delivers up to 75mA continuous output current at 3.3V with VIN ≥ 2.0V and TA ≤ +70°C. This rating is thermally limited by the TQFN-EP package's 41°C/W θJA; at higher ambient temperatures or heavier loads, derating is required per the power dissipation equation PDISS = IOUT(2VIN − VOUT).
Does MAX1595ETC33+ support both step-up and step-down operation?
Yes, the MAX1595ETC33+ supports true buck-boost operation: it steps up input voltages below 3.3V (e.g., 1.8V–3.2V) and steps down inputs above ~4.0V (exceeding VOUT by one diode drop). Its internal MOSFET switching architecture automatically selects mode based on VIN relative to VOUT, maintaining regulation across the full 1.8V–5.5V input range.
What external components are required for basic operation of MAX1595ETC33+?
The MAX1595ETC33+ requires exactly three external ceramic capacitors: 1µF input capacitor (CIN) on IN, 0.22µF charge-transfer capacitor (CX) between CXP and CXN, and 1µF output capacitor (COUT) on OUT. No inductor, diodes, or resistors are needed - simplifying layout and reducing BOM count.
How does the shutdown function behave in MAX1595ETC33+?
When SHDN is pulled low, the MAX1595ETC33+ enters shutdown mode drawing only 0.1µA, and the internal switches disconnect OUT from IN - preventing backfeed. Upon SHDN high, the device initiates soft-start (≤2ms ramp), during which the output voltage rises linearly until regulation is achieved or the timer expires.
Is the exposed pad (EP) on MAX1595ETC33+ electrically connected?
No, the exposed pad (EP) on the MAX1595ETC33+ TQFN package is internally connected to GND solely for thermal conduction - it is not an electrical signal node. It must be soldered to a large PCB ground plane to achieve the specified θJA = 41°C/W; leaving it unconnected degrades thermal performance and risks overheating under load.
MAX1595ETC33+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 12-TQFN (4x4)
MAX1595ETC33+T FAQ
1.How can I place an order for MAX1595ETC33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1595ETC33+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 MAX1595ETC33+T reliable?
The price and inventory of MAX1595ETC33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1595ETC33+T is usually 5 days.
3.What payment methods are accepted for MAX1595ETC33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1595ETC33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1595ETC33+T?
MAX1595ETC33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1595ETC33+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 MAX1595ETC33+T?
For technical support, including MAX1595ETC33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1595ETC33+T requirements.
6.How does Aetrix verify that MAX1595ETC33+T is sourced from the original manufacturer or authorized distributors?
All MAX1595ETC33+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 MAX1595ETC33+T meets industry standards.
7.What is the process for return or replacement of MAX1595ETC33+T?
All MAX1595ETC33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1595ETC33+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 MAX1595ETC33+T part is unused and in its original packaging.
Return procedure for MAX1595ETC33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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