Overview

The XL6009 (XL6009E1) is a 4A 400kHz 60V step-up (boost) DC-DC converter manufactured by XLSEMI. Designed with a high-power internal N-channel MOSFET switch and current-mode control architecture, it serves as the modern replacement for the older LM2577 boost regulator IC.

Widely sold as a medium-to-high power adjustable DC-DC step-up module, it accepts input voltages between 5.0V5.0\text{V} and 32.0V32.0\text{V} and delivers an adjustable boosted output voltage of 5.0V5.0\text{V} to 38.0V38.0\text{V} with up to 94% conversion efficiency.

Quick reference

Input Voltage (VIN)5.0 V to 32.0 V DC
Output Voltage (VOUT)Adjustable from 5.0 V to 38.0 V DC
Internal Switch Current Limit4.0 A peak
Switching Frequency400 kHz fixed
Max EfficiencyUp to 94%
Feedback Reference Voltage1.25 V (±1.5%\pm 1.5\%)
PackageTO-263-5L (D2PAK) / Breakout Module

Pinout & Module Terminals

TO-263-5L Package IC

text
         ┌───┴───┐
     GND 1│       │
      EN 2│       │
      SW 3│XL6009 │ (Tab connected to SW)
      FB 4│       │
     VIN 5│       │
         └───────┘
PinNameDescription
1GNDGround reference pin
2ENEnable pin. High (or floating) = Active; Low = Shutdown
3SWPower switch output pin (internal N-MOSFET drain)
4FBFeedback pin (VFB = 1.25V)
5VINSupply power input pin (5V to 32V)

Module Terminals

TerminalFunctionDescription
IN+Positive InputPositive DC supply rail (+5V to +32V)
IN-Negative InputSystem ground (GND)
OUT+Positive OutputBoosted DC output rail (+5V to +38V)
OUT-Negative OutputSystem ground (GND)

Specifications

ParameterSymbolMinTypMaxUnitConditions
Input VoltageVINV_{IN}5.0—32.0VDC
Output VoltageVOUTV_{OUT}5.0—38.0VAdjustable
Switch Current LimitISWI_{SW}—4.0—APeak inductor switch current
Switching FrequencyfOSCf_{OSC}320400480kHzOperating frequency
Feedback VoltageVFBV_{FB}1.2311.2501.269VVIN=12VV_{IN} = 12\text{V}
Quiescent CurrentIqI_q—7.510.0mAVFB=2VV_{FB} = 2\text{V}
Max Efficiencyη\eta—9294%VIN=12V,VOUT=18V,IOUT=1AV_{IN}=12\text{V}, V_{OUT}=18\text{V}, I_{OUT}=1\text{A}

Basic Circuit Diagram (Standalone IC)

text
        Inductor L1 (33µH - 47µH)
  VIN ────┬───────███████───────┬───────►|─────┬─────────── VOUT
          │                     │     Schottky │
       [C_IN 47µF]         [Pin 3: SW]  Diode [C_OUT 220µF]
          │                     │   (SS34/SS54)│
         GND                XL6009             R1
                                │              │
                           [Pin 4: FB] ────────┴────[R2]─── GND

Formula for Output Voltage:VOUT=1.25V×(1+R1R2)\text{Formula for Output Voltage:} \quad V_{OUT} = 1.25\text{V} \times \left(1 + \frac{R_1}{R_2}\right)

Wiring (Breakout Module)

XL6009 Module→Source / LoadNotes
IN+12V Solar Panel / BatteryInput DC voltage
IN-GNDInput Ground
OUT+24V Motor / LED PanelStepped-up output
OUT-GNDOutput Ground

Common mistakes

  • Operating continuously above 2.5A without cooling: Although rated for 4A peak switch current, continuous output operation above 2.5A creates significant heat in the TO-263 IC and inductor. Add an external heatsink or cooling fan for sustained high-current loads.
  • Forgetting input polarity protection: Cheap XL6009 breakout modules lack input reverse polarity protection. Connecting IN+IN+ and IN−IN- backwards will instantly destroy the XL6009 IC.
  • Output capacitor voltage rating: When boosting to high output voltages (24V…35V24\text{V} \dots 35\text{V}), ensure the output electrolytic filter capacitor is rated for at least 50V to avoid dielectric failure.

Notes

  • XL6009 vs LM2577 vs MT3608: XL6009 switches at 400kHz (vs LM2577's 52kHz), allowing smaller inductors and higher efficiency. MT3608 is better suited for smaller <2A portable battery projects, while XL6009 handles higher power requirements up to 4A.

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