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Texas Instruments TPS6735IDRG4
- Part No.:
- TPS6735IDRG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS6735IDRG4.pdf
- Description:
- IC REG BUCK -5V 200MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,686
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Product details
Overview
TPS6735IDRG4 from Texas Instruments is a fixed-frequency, current-mode PWM inverting DC/DC converter delivering −5 V at up to 200 mA from 4.5–6.2 V input. It integrates a 0.4-Ω p-channel MOSFET power switch, 1.22-V reference output (125 µA sink/source), soft-start control, and enable shutdown with 1-µA quiescent current. Used in computer peripherals and battery-powered systems requiring compact negative rail generation.
For engineers reviewing the TPS6735IDRG4 datasheet, TPS6735IDRG4 pinout, TPS6735IDRG4 application, or TPS6735IDRG4 equivalent, key selection criteria include its inverting topology, 160-kHz fixed switching frequency, SOIC-8 package compatibility, −40°C to 85°C operating range, and pin-for-pin equivalence with MAX735 for drop-in replacement in legacy designs.
Technical Context
The TPS6735IDRG4 implements a current-mode PWM control architecture with slope compensation, using an internal 160-kHz oscillator and a high-side p-channel MOSFET with integrated current sensing. Its error amplifier compares FB voltage against a 1.22-V reference, feeding into a PWM comparator that regulates duty cycle based on sensed inductor current.
Functional blocks include undervoltage lockout (UVLO) triggering at 3.7 V, overcurrent protection limiting peak switch current to 2 A, and soft-start clamping via external capacitor on SS pin. The EN input provides logic-level shutdown, reducing supply current to ≤1 µA while discharging the soft-start capacitor through a 1.2-MΩ internal resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −5 V nominal, regulated between −4.75 V and −5.25 V across 0–200 mA load and 4.5–6.2 V input |
| Input Voltage Range | 4 V to 6.2 V - supports single-cell Li-ion or 5-V rail operation with margin for dropout |
| Switching Frequency | 160 kHz fixed - enables predictable EMI filtering and consistent inductor sizing (e.g., 10 µH) |
| Efficiency | 78% typical at 100 mA load - minimizes thermal rise in space-constrained board-level applications |
| Power Switch | 0.4-Ω p-channel MOSFET - reduces conduction loss and eliminates need for external high-side driver |
| Reference Output | 1.22 V ±1%, 125 µA max - provides stable bias for external circuitry without additional LDO |
| Shutdown Current | ≤1 µA - enables ultra-low-power sleep modes in portable equipment |
Pinout & Package
TPS6735IDRG4 is packaged in an 8-pin SOIC (D package), JEDEC MS-012 compliant, with 1.27-mm lead pitch and RoHS-compliant NiPdAu (NIPDAU) finish. Thermal performance rated at 725 mW at 25°C ambient, derating 5.8 mW/°C above TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Logic-high (>2 V) enables operation; logic-low (≤0.4 V) forces shutdown and discharges SS capacitor |
| REF (Pin 2) | 1.22-V reference output | Sources/sinks up to 125 µA; requires 10-µF bypass capacitor to ground for noise immunity |
| SS (Pin 3) | Soft-start timing node | External capacitor sets ramp rate; internal 1.2-MΩ pull-up to REF defines start-up time and current limit ramp |
| COMP (Pin 4) | Error amplifier compensation | Connects to GND via 82-pF capacitor for loop stability with >100 mA loads |
| FB (Pin 5) | Feedback input | Connects to output node; senses −5 V via resistive divider to regulate output voltage |
| GND (Pin 6) | Power and signal ground | Common return for all internal circuits; must be low-impedance connection to minimize noise coupling |
| OUT (Pin 7) | Power switch drain | Connects to Schottky rectifier anode; carries pulsed inductor current and requires short PCB trace |
| VCC (Pin 8) | Supply input | Accepts 4–6.2 V; requires local 1-µF ceramic + 47-µF bulk capacitor for transient response and stability |
Key Features
| Feature | Design Value |
|---|---|
| Inverting topology with integrated p-channel MOSFET | Eliminates need for external high-side driver or charge pump; simplifies BOM and layout for −5 V generation |
| 160-kHz fixed-frequency current-mode control | Enables deterministic EMI filtering and consistent loop compensation; avoids subharmonic oscillation at light loads |
| 1.22-V precision reference with 50 ppm/°C drift | Supports accurate external biasing or auxiliary regulation without adding a second voltage reference IC |
| Soft-start with external capacitor programmability | Prevents inrush current and output overshoot; delay adjustable from ~10 ms to >70 ms via SS capacitor value |
| Undervoltage lockout (3.7 V threshold) | Prevents erratic startup or brownout operation during power ramp-up or battery sag conditions |
| Overcurrent protection with automatic soft-start recovery | Trips at 2-A peak switch current and initiates controlled restart-no latch-up or manual reset required |
Applications
| Computer Peripherals | Battery-Powered Instrumentation |
|---|---|
Use Scenario: USB-connected test equipment requiring isolated analog front-end bias rails. IC Role / Device Role / Timing Role: Generates stable −5 V for op-amp dual-supply operation from shared 5-V USB bus. Use Value: Enables rail-to-rail analog signal conditioning without external negative supply or discrete inverter stage. |
Use Scenario: Handheld multimeter with LCD contrast control and analog sensor interface. IC Role / Device Role / Timing Role: Supplies −5 V for LCD bias and precision ADC reference from single 3.7-V Li-ion cell via boost-inverter stage. Use Value: Reduces component count by integrating MOSFET, controller, and reference-critical for compact form factor. |
| Industrial I/O Modules | Legacy RS-232 Transceivers |
Use Scenario: DIN-rail mounted PLC I/O card needing isolated analog output compliance voltage. IC Role / Device Role / Timing Role: Provides −5 V for current-loop drivers (e.g., 4–20 mA HART modems) referenced to system ground. Use Value: Maintains 0.2% line/load regulation across wide temperature and input variation-ensuring field accuracy. |
Use Scenario: Embedded microcontroller interfacing with legacy RS-232 peripherals. IC Role / Device Role / Timing Role: Generates −5 V for RS-232 level-shifting transceivers (e.g., MAX232-compatible) from 5-V logic supply. Use Value: Pin-for-pin compatible with MAX735-enables direct upgrade path with no PCB redesign or firmware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX735CPA+ | Same pinout, identical −5 V output, but uses n-channel MOSFET with charge pump; lower efficiency (72% typ.) and higher no-load current (25 µA) | Less suitable for ultra-low-power sleep modes; requires external charge-pump capacitor | Preferred only where legacy MAX735 footprint must be retained and efficiency is secondary |
| LM2662CMX/NOPB | Charge-pump inverter (no inductor); delivers only 100 mA at −5 V; 99% efficiency not achievable due to switching losses | Not viable for >100 mA loads; limited to low-noise, low-current analog biasing | Select when board space prohibits inductors and load current stays below 80 mA |
Compared with MAX735CPA+, TPS6735IDRG4 offers 6% higher efficiency and 24× lower shutdown current; versus LM2662CMX/NOPB, it supports double the output current and maintains tight regulation under dynamic load steps-making it optimal for medium-power inverting applications demanding reliability and thermal headroom.
Availability
TPS6735IDRG4 is available at Aetrix Electronics and suitable for computer peripherals, battery-powered instrumentation, and industrial I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS6735IDRG4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability DC/DC conversion solutions.
The TPS6735 product line was designed specifically for compact, efficient negative-voltage generation in space-constrained applications where simplicity, low quiescent current, and robust thermal performance are critical.
FAQ
What is the maximum output current capability of the TPS6735IDRG4?
The TPS6735IDRG4 delivers up to 200 mA continuous output current at −5 V under recommended operating conditions (VCC = 4.5–6.2 V, TA = −40°C to 85°C). Peak switch current is internally limited to 2 A, and full-load operation is supported with proper thermal design and 10-µH inductor selection per the datasheet's Figure 8.
Does the TPS6735IDRG4 require external components beyond the basic inverter circuit?
Yes - the TPS6735IDRG4 requires five external components for basic operation: a 10-µH inductor, 100-µF output capacitor, 47-µF input capacitor, 1N5817 Schottky rectifier, and 82-pF compensation capacitor. Additional components include a 10-µF REF bypass cap and optional soft-start capacitor on SS, as specified in Figure 15 of the SLVS141A datasheet.
Can the TPS6735IDRG4 generate output voltages other than −5 V?
No - the TPS6735IDRG4 is a fixed-output inverting converter optimized exclusively for −5 V. Its internal feedback divider and reference are trimmed to regulate precisely at −5 V; altering output voltage would require replacing the IC with an adjustable variant such as the TPS6734 or redesigning with external resistor networks incompatible with this device's FB pin architecture.
What is the purpose of the SS (soft-start) pin on the TPS6735IDRG4?
The SS pin on the TPS6735IDRG4 controls the soft-start ramp rate by accepting an external capacitor to ground. During startup or EN assertion, the internal 1.2-MΩ pull-up charges this capacitor, gradually raising the current limit threshold and preventing output overshoot or inrush current. Minimum recommended capacitance is 10 nF per Figure 13.
Is the TPS6735IDRG4 pin-compatible with the MAX735 series?
Yes - the TPS6735IDRG4 is explicitly documented as pin-for-pin compatible with the MAX735 in the datasheet's first paragraph and functional description. Both share identical 8-pin SOIC/DIP pinouts, terminal functions, and electrical behavior, enabling direct replacement without PCB modification in existing MAX735-based designs.
TPS6735IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 6.2V
- Voltage - Output (Min/Fixed):
- -5V
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- 160kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS6735IDRG4 FAQ
1.How can I place an order for TPS6735IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS6735IDRG4 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 TPS6735IDRG4 reliable?
The price and inventory of TPS6735IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS6735IDRG4 is usually 5 days.
3.What payment methods are accepted for TPS6735IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS6735IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS6735IDRG4?
TPS6735IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS6735IDRG4 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 TPS6735IDRG4?
For technical support, including TPS6735IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS6735IDRG4 requirements.
6.How does Aetrix verify that TPS6735IDRG4 is sourced from the original manufacturer or authorized distributors?
All TPS6735IDRG4 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 TPS6735IDRG4 meets industry standards.
7.What is the process for return or replacement of TPS6735IDRG4?
All TPS6735IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS6735IDRG4, 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 TPS6735IDRG4 part is unused and in its original packaging.
Return procedure for TPS6735IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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