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Texas Instruments LM3489MMX/NOPB
- Part No.:
- LM3489MMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Description:
- IC REG CTRLR BUCK 8VSSOP
- Quantity:
Unit Price:$1.34
Ext Price:$1.34
- Payment:
- Shipping:
Product Details
LM3489MMX/NOPB - TI Hysteretic PFET Buck Controller
LM3489MMX/NOPB is an active Texas Instruments hysteretic controller for positive-output step-down converters. It drives an external P-channel MOSFET, operates from 4.5 V to 35 V, and is supplied in an 8-pin VSSOP (DGK) large tape-and-reel package.
Part-specific information is based on TI's current orderable-part page and the LM3489x datasheet. Verify the latest controlled manufacturer documents before design release.
Overview
The LM3489MMX/NOPB uses hysteretic control to regulate a buck converter without a conventional error amplifier compensation network or fixed internal oscillator. The controller monitors the feedback voltage and switches the external PFET as the feedback signal crosses its internal hysteresis thresholds.
The PFET architecture supports low dropout and 100% duty-cycle operation. Switching frequency varies with input voltage, output voltage, inductance, output-capacitor ESR, propagation delay, and load condition, so the power stage must be evaluated across the complete operating range.
Key Advantages
The architecture avoids a conventional loop-compensation network and responds directly to the feedback ripple.
A 4.5 V to 35 V supply range supports many intermediate-bus, industrial, and distributed-power designs.
The external PFET can remain on for 100% duty-cycle operation when the input approaches the programmed output.
The controller can sense PFET RDS(ON) or an external sense resistor and uses the ADJ pin to set the threshold.
Feature Summary
A resistor divider programs the output from the 1.239 V typical feedback reference up toward the input voltage.
Pull EN low to shut down the controller; leaving EN open enables operation through the internal pull-up.
Operating frequency falls at light load, reducing switching loss without forcing fixed-frequency operation.
PGATE drives an external high-side P-channel MOSFET and swings between VIN and approximately VIN minus 5 V.
Package & Footprint
LM3489MMX/NOPB uses TI's 8-pin VSSOP (DGK) surface-mount package. The DGK outline has a nominal 0.65 mm lead pitch and a body approximately 3.0 mm by 3.0 mm. The MMX ordering option is supplied on a large tape-and-reel carrier of 3,500 pieces.
- Use TI's DGK package drawing for land dimensions and pin-1 orientation.
- Place the VIN bypass capacitor directly beside VIN and the ground return.
- Keep FB and current-sense paths away from the switch node and inductor field.
- Connect GND and PGND with a short, low-impedance path near the device.
The package registry contains 8-VSSOP, but 8-VSSOP.jpg is currently marked as missing. Add and verify the JPEG before publishing this page.
Pin Functions
The following mapping is for the 8-pin VSSOP (DGK), top view in the TI datasheet.
Confirm pin orientation, allowable voltages, current-sense filtering, and ground routing in the current TI datasheet before PCB layout.
Key Specifications
| Orderable Part Number | LM3489MMX/NOPB |
|---|---|
| Manufacturer | Texas Instruments (TI) |
| Function | Hysteretic PFET buck controller |
| Package | 8-pin VSSOP (DGK), surface mount |
| Carrier Quantity | 3,500 pieces, large tape and reel |
| Input Supply Range | 4.5 V to 35 V |
| Adjustable Output Range | 1.239 V typical reference up to VIN, subject to circuit conditions |
| Maximum Duty Cycle | 100% |
| Feedback Voltage | 1.239 V typical; 1.214 V to 1.264 V over stated conditions |
| Comparator Hysteresis | 10 mV typical; 20 mV maximum |
| Shutdown Supply Current | 7 µA typical; 15 µA maximum with EN low |
| Quiescent Current | 280 µA typical; 400 µA maximum when not switching under TI test conditions |
| Current-Limit Off Time | 9 µs typical; 6 µs to 14 µs under the stated test condition |
| Operating Junction Temperature | −40 °C to +125 °C |
| Product Rating | Catalog; automotive-qualified LM3489-Q1 ordering options are separate |
Typical and limit values use different conditions. Apply the electrical-characteristics table and application equations to the actual converter design.
Replacement Considerations
TI lists multiple LM3489 orderable options using the same DGK VSSOP footprint. Carrier quantity, qualification, finish, and exact orderable code must still be checked before substitution.
- LM3489MM/NOPB: catalog version in the same 8-pin VSSOP package, supplied on a 1,000-piece small tape-and-reel carrier.
- LM3489QMMX/NOPB: automotive-qualified LM3489-Q1 ordering option in the same package and 3,500-piece large reel; verify qualification requirements and production documentation.
- LM3489QMM/NOPB: automotive-qualified LM3489-Q1 option in the same package with a 1,000-piece small reel.
- LM3489MMX/NOPB.A and LM3489MMX/NOPB.B: TI identifies these as identical part-number variants for this orderable device; confirm the supplier label and current availability.
Package and pin compatibility alone do not establish full interchangeability. Recheck the exact qualification, reel format, lead finish, current-limit setup, output ripple, switching frequency, and thermal behavior.
Manufacturer Information
Texas Instruments lists LM3489MMX/NOPB as an active production orderable part in the LM3489 family. The manufacturer documentation provides the controlled electrical limits, DGK package drawing, reel data, material information, and application guidance.
- Series: LM3489
- Package drawing: DGK, 8-pin VSSOP
- Part marking: SKSB according to the current package addendum
- Moisture sensitivity: MSL 1, 260 °C peak reflow listing
Applications
Point-of-load and intermediate-bus buck stages that benefit from a wide input range and external PFET selection.
Step-down rails requiring adjustable output voltage, shutdown control, and configurable current limiting.
Applications where 100% duty-cycle capability helps maintain regulation as VIN approaches VOUT.
Power stages where an 8-pin controller and a small external component set are preferred.
Quality & Authenticity
Match the full LM3489MMX/NOPB orderable code, package marking, reel label, lot information, and moisture-barrier packaging to traceable procurement records. Confirm the required catalog or automotive qualification before approving a substitute.
FAQ
Does LM3489MMX/NOPB contain the power MOSFET?
No. It is a controller that drives an external high-side P-channel MOSFET.
Is its switching frequency fixed?
No. The hysteretic operating frequency varies with the power-stage components, voltages, ripple, delay, and load.
What does MMX indicate?
For this TI ordering option, MMX corresponds to the 8-pin DGK VSSOP supplied on the 3,500-piece large tape-and-reel carrier.
Can LM3489QMMX/NOPB replace it directly?
It uses the same package and belongs to the automotive-qualified LM3489-Q1 branch, but qualification, material, sourcing, and approved-component requirements must be reviewed.
Engineering Notice
This page supports component identification and initial selection. Final component approval must use the current TI datasheet, package drawing, quality records, and validation in the actual converter across line, load, temperature, startup, shutdown, fault, and transient conditions.
LM3489MMX/NOPB Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 35V
- Frequency - Switching:
- Up to 1MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
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