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Analog Devices Inc./Maxim Integrated MAX1595ETC33
- Part No.:
- MAX1595ETC33
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1595ETC33.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,934
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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 no inductor requirement. It serves as a compact auxiliary supply for white LED biasing and flash memory power in space-constrained battery-powered systems.
For engineers reviewing the MAX1595ETC33 datasheet, MAX1595ETC33 pinout, MAX1595ETC33 application, or MAX1595ETC33 equivalent, key selection criteria include its TQFN-EP package thermal performance (θJA = 41°C/W), shutdown current of 5µA, load disconnect capability, and compatibility with 0.22µF transfer capacitors in minimal-footprint designs.
Technical Context
The MAX1595ETC33 implements a dual-mode charge-pump architecture that dynamically operates in boost (VIN < VOUT) or buck (VIN > VOUT + diode drop) mode using internal MOSFET switches S1 and S2. Its error amplifier compares AOUT-sensed output voltage against a 1.23V bandgap reference through an internal resistive divider.
Regulation is maintained via constant-frequency 1MHz operation under medium-to-heavy loads, transitioning smoothly to low-power mode at light loads. Output ripple is approximated by VRIPPLE ≅ IOUT / (2 × fOSC × COUT), with typical values ≤35mV at 75mA using 1µF COUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over -40°C to +85°C, enabling stable logic-level supply without external feedback. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, and multi-cell alkaline inputs without pre-regulation. |
| Max Output Current | 75mA at 3.3V output - sufficient for driving 3–5 white LEDs or powering small flash memory arrays. |
| Switching Frequency | 1.0MHz (±15%) - allows use of 0.22µF ceramic CX capacitor and minimizes EMI filtering requirements. |
| Quiescent Current | 220µA at VIN = 2.0V - enables >1000-hour standby in coin-cell–powered devices. |
| Shutdown Current | 5µA - ensures negligible battery drain during system sleep, with full load disconnect. |
| Thermal Resistance | θJA = 41°C/W (TQFN-EP) - supports 1951mW max dissipation at +70°C ambient, critical for high-duty-cycle operation. |
Pinout & Package
MAX1595ETC33 is housed in a 12-pin TQFN-EP package (3mm × 3mm × 0.8mm) with exposed pad thermally connected to GND. The EP pad must be soldered to a large PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AOUT | Analog power/sense input to error amplifier | Connects directly to output filter capacitor node for accurate remote sensing and ripple rejection. |
| SHDN | Digital enable/disable control input | Active-high logic interface; pulls output to high-Z state when low, isolating IN from OUT. |
| IN | Main power input (pins 2 & 3) | Dual-pin configuration reduces trace inductance and IR drop for high-current input paths. |
| GND | Analog ground reference (pin 4) | Provides clean reference for internal bandgap and comparator; separate from PGND to minimize noise coupling. |
| PGND | Power ground return (pins 5 & 6) | High-current return path for charge-pump switches; must be short-traced to IN and CXN/CXP. |
| CXN | Negative terminal of transfer capacitor (pins 7 & 8) | Connects to low-side switch node; requires low-ESR ceramic capacitor placement adjacent to IC. |
| CXP | Positive terminal of transfer capacitor (pin 9) | Connects to high-side switch node; routing must avoid sensitive analog traces like AOUT. |
| OUT | Regulated output (pins 10, 11 & 12) | Three-pin parallel connection lowers output impedance and improves current sharing up to 75mA. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates magnetic components and associated EMI, enabling ultra-thin PCBs (<0.8mm profile) and simplified layout. |
| Buck-boost charge-pump topology | Maintains regulation across input voltages both below and above 3.3V - ideal for discharging batteries from 4.2V to 1.8V. |
| Load disconnect in shutdown | Prevents backfeed from output to input, protecting upstream sources and enabling true system-level power gating. |
| 12-pin TQFN-EP thermal performance | 41°C/W θJA enables continuous 75mA output at +70°C ambient without derating - 5× better than µMAX variant. |
| Ultra-low shutdown current | 5µA draw ensures <1% annual battery loss in always-on backup applications such as SIM card power supplies. |
Applications
| White LED Backlighting | Flash Memory Supply |
|---|---|
Use Scenario: Powering 3–5 white LEDs in portable LCD displays with varying battery voltage (2.8V–4.2V). IC Role / Device Role / Timing Role: Regulated 3.3V current source driver with constant brightness control independent of input decay. Use Value: Maintains LED luminance within ±5% over full battery discharge curve while using only three 0603 ceramic caps. | Use Scenario: Providing stable 3.3V supply to NAND/NOR flash in PCMCIA cards and embedded storage modules. IC Role / Device Role / Timing Role: Auxiliary voltage rail generator with fast line-transient response (<200µs settling) to prevent data corruption during host access bursts. Use Value: Delivers 75mA peak current with <35mV ripple at 1MHz, eliminating need for post-regulator LDO in cost-sensitive designs. |
| Backup-Battery Boost Converter | GSM SIM Card Power |
Use Scenario: Boosting 1.8V–2.4V backup battery to 3.3V for real-time clock and SRAM retention during main power failure. IC Role / Device Role / Timing Role: Low-quiescent-current (220µA) step-up regulator with automatic mode transition to preserve battery life. Use Value: Enables >1-year backup runtime on CR2032 cell; shutdown current of 5µA prevents parasitic drain. | Use Scenario: Powering 3V SIM cards from 1.8V or 2.8V host rails in dual-voltage mobile handsets. IC Role / Device Role / Timing Role: Level-shifting auxiliary supply with load disconnect to meet ISO/IEC 7816-3 hot-swap requirements. Use Value: Complies with SIM card power sequencing specs; AOUT sensing ensures regulation accuracy despite contact resistance variations. |
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 die, 8-pin µMAX package with θJA = 206°C/W and 387mW max power dissipation. | Limited to ≤30mA continuous output due to thermal constraints; unsuitable for sustained 75mA loads. | Select when board area is constrained to <12mm² and output current ≤30mA. |
| TPS60403DBVR | 3.3V fixed-output, 60mA max, 1.2MHz switching, no AOUT sense pin, higher IQ (250µA). | Lacks buck capability and load disconnect; requires external feedback for tighter regulation. | Select for simpler, lower-cost designs where input stays strictly below 3.3V and thermal margin is ample. |
Compared with MAX1595EUA33+ and TPS60403DBVR, MAX1595ETC33 offers superior thermal handling for 75mA loads, true buck-boost operation across 1.8V–5.5V, and precision AOUT-sensed regulation - making it the only option qualified for high-duty-cycle SIM card and flash memory auxiliary rails.
Availability
MAX1595ETC33 is available at Aetrix Electronics and suitable for white LED backlighting, flash memory supplies, and GSM SIM card power applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
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, communications, and consumer markets.
The MAX1595 product line delivers compact, inductorless DC-DC conversion for portable and battery-critical systems where board space, thermal density, and input voltage variability are primary constraints.
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 full regulation across -40°C to +85°C. This rating is enabled by its 12-pin TQFN-EP package's low thermal resistance (θJA = 41°C/W), allowing safe operation at ambient temperatures up to +70°C without derating. Exceeding 75mA risks thermal shutdown or output droop per the device's power dissipation limit of 1951mW.
Does MAX1595ETC33 support input voltages higher than its 3.3V output?
Yes, MAX1595ETC33 supports buck operation when input exceeds 3.3V by a diode drop (~0.4V), maintaining regulated 3.3V output down to 1.8V input. Its dual-mode architecture uses internal MOSFET switches S1 and S2 to route charge from IN to CX and then to OUT, enabling seamless transition between step-up and step-down modes without external control. This eliminates need for separate buck converters in multi-cell battery systems.
How does the AOUT pin improve regulation accuracy in MAX1595ETC33?
The AOUT pin on MAX1595ETC33 provides Kelvin sensing of the output voltage at the filter capacitor node, feeding directly into the error amplifier. This compensates for IR drops across PCB traces and bond wires, ensuring ±3% regulation accuracy at the load rather than at the die. Unlike standard feedback configurations, AOUT eliminates the need for external resistor dividers and maintains stability with ceramic output capacitors as small as 1µF.
What is the recommended capacitor configuration for MAX1595ETC33 in a 75mA application?
For 75mA operation, MAX1595ETC33 requires CIN = 1µF, CX = 0.22µF, and COUT = 1µF - all X7R ceramic in 0603 or 0805 case sizes. These values balance ripple reduction (<35mV), transient response, and board area. Taiyo Yuden LMK212BJ105MG (CIN), LMK107BJ224MA (CX), and same-series COUT are validated per Maxim's Table 1 and Figure 4. Larger COUT further reduces ripple but adds cost and footprint.
Is MAX1595ETC33 pin-compatible with other variants in the MAX1595 family?
No, MAX1595ETC33 is not pin-compatible with the 8-pin µMAX variants (e.g., MAX1595EUA33+). Its 12-pin TQFN-EP package has different pin count, layout, and thermal pad configuration. Pin functions differ: TQFN assigns IN, PGND, and OUT to multiple pins for current sharing and thermal relief, while µMAX consolidates them. Migration requires PCB redesign and land pattern update per Maxim's outline 21-0139.
MAX1595ETC33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (4x4)
MAX1595ETC33 FAQ
1.How can I place an order for MAX1595ETC33 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1595ETC33 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 reliable?
The price and inventory of MAX1595ETC33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1595ETC33 is usually 5 days.
3.What payment methods are accepted for MAX1595ETC33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1595ETC33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1595ETC33?
MAX1595ETC33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1595ETC33 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?
For technical support, including MAX1595ETC33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1595ETC33 requirements.
6.How does Aetrix verify that MAX1595ETC33 is sourced from the original manufacturer or authorized distributors?
All MAX1595ETC33 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 meets industry standards.
7.What is the process for return or replacement of MAX1595ETC33?
All MAX1595ETC33 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1595ETC33, 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 part is unused and in its original packaging.
Return procedure for MAX1595ETC33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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