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Discrete Divice
LVMOS
Planar LVMOS Normal Trench LVMOS Split Gate Trench LVMOS Automotive MOSFET
HVMOS
Planar HVMOS Multi-Epi DPMOS Trench DPMOS
IGBT
Planar IGBT Trench IGBT SiC Hybrid IGBT RC IGBT
SiC
SiC MOS
Diode
FRD
IPM
DIP2V/SOP2V
DIP-23/SOP-23
DIP-24
DIP-25
DIP-Q25A
SDIP-26
DIP-27
DIP-29
SOP-30
SOP-37
DIP-T46A
IGBT Module
Automobile module
Industrial Module
AC-DC Converter
SSR Flyback Controller IC
PSR Flyback Controller IC
Synchronous Rectifier IC
Non-isolated BUCK/BUCK-BOOST IC
PFC IC
Fast Charging IC
Power Bank Fast Charger IC
Car Charger IC
AC-DC Fast Charging Protocol IC
DC-DC Converter
DC-DC Converter IC
PoE IC
LED Lighting Driver
Dimming LED Lighting Driver
Non-dimming LED Lighting Driver
Automotive LED Driver
Gate Driver IC
Three-phase Half Bridge Driver
Single Half-bridge Driver
PFC IGBT Gate Driver
MEMS Sensor
Triaxial Acceleration Sensor
Six- Axis Inertial Sensor
Proximity Detection and Digital Ambient Light Sensor
Heart Rate Sensor
Silicon Microphone Sensor
MCU IC
8bit MCU
32bit MCU
Integrated Driver MCU
Digital Audio/Video
CD SERVO
Audio Decode
Audio Effects Processing
Intelligent Audio
ASIC
Bipolar PWM Controller
Bipolar DC-DC
LDO
Volume and Sound Control Circuit
DC Drive Circuit
Darlington Circuit
Logic & Switch & Level Shift
Operational Amplifier Circuit
Comparator
Reference IC
Linear Regulator
Audio Circuit
Interface ICs
LED Chip
GaN
GaN-Automotive lighting GaN-Display screen GaN-General lighting GaN-Landscape lighting
GaAs
GaAs-Agriculture & horticulture lighting GaAs-Automotive lighting GaAs-Display screen GaAs-Infrared GaAs-Landscape lighting
Smart Power Switches
Low-side Smart Power Switches
High-side Smart Power Switches
Low-Voltage Motor Driver
Automotive Low-Voltage Motor Driver
Consumer & Industrial Low-Voltage Motor Driver
Discrete Divice
LVMOS
Planar LVMOS Normal Trench LVMOS Split Gate Trench LVMOS Automotive MOSFET
HVMOS
Planar HVMOS Multi-Epi DPMOS Trench DPMOS
IGBT
Planar IGBT Trench IGBT SiC Hybrid IGBT RC IGBT
SiC
SiC MOS
Diode
FRD
IPM
DIP2V/SOP2V
DIP-23/SOP-23
DIP-24
DIP-25
DIP-Q25A
SDIP-26
DIP-27
DIP-29
SOP-30
SOP-37
DIP-T46A
IGBT Module
Automobile module
Industrial Module
AC-DC Converter
SSR Flyback Controller IC
PSR Flyback Controller IC
Synchronous Rectifier IC
Non-isolated BUCK/BUCK-BOOST IC
PFC IC
Fast Charging IC
Power Bank Fast Charger IC
Car Charger IC
AC-DC Fast Charging Protocol IC
DC-DC Converter
DC-DC Converter IC
PoE IC
LED Lighting Driver
Dimming LED Lighting Driver
Non-dimming LED Lighting Driver
Automotive LED Driver
Gate Driver IC
Three-phase Half Bridge Driver
Single Half-bridge Driver
PFC IGBT Gate Driver
MEMS Sensor
Triaxial Acceleration Sensor
Six- Axis Inertial Sensor
Proximity Detection and Digital Ambient Light Sensor
Heart Rate Sensor
Silicon Microphone Sensor
MCU IC
8bit MCU
32bit MCU
Integrated Driver MCU
Digital Audio/Video
CD SERVO
Audio Decode
Audio Effects Processing
Intelligent Audio
ASIC
Bipolar PWM Controller
Bipolar DC-DC
LDO
Volume and Sound Control Circuit
DC Drive Circuit
Darlington Circuit
Logic & Switch & Level Shift
Operational Amplifier Circuit
Comparator
Reference IC
Linear Regulator
Audio Circuit
Interface ICs
LED Chip
GaN
GaN-Automotive lighting GaN-Display screen GaN-General lighting GaN-Landscape lighting
GaAs
GaAs-Agriculture & horticulture lighting GaAs-Automotive lighting GaAs-Display screen GaAs-Infrared GaAs-Landscape lighting
Smart Power Switches
Low-side Smart Power Switches
High-side Smart Power Switches
Low-Voltage Motor Driver
Automotive Low-Voltage Motor Driver
Consumer & Industrial Low-Voltage Motor Driver
SD59D31
36V, 6A SYNCHRONOUS STEP-DOWN DC/DC CONVERTER
Description Main feature Product specification classification Technical documentation Relevant package outline drawing

     The SD59D31 is a fully-integrated, high-efficiency step-down DC-DC switching regulator equipped with I2C interface. With a wide input range of 4V to 36V, the output voltage can be configured between 3V and 30V by tuning the 12-bit VDAC and 9-bit IDAC, and it supports a maximum load current of 6A. Its fast, smooth and low-overshoot switching-edge characteristics enable high-efficiency operation even under high switching frequencies, with peak-current-mode control adopted.

     It integrates soft-start function and incorporates multiple safety mechanisms, including over-temperature protection (OTP), over-voltage protection (OVP) and over-current protection (OCP).


Main feature

  • Low-EMI architecture, frequency-dithering support

  • High-power-density design, few external peripheral components required

  • QFN16-3x3 package

  • Built-in compensated CC/CV control loops

  • Wide operating voltage range

  • Input voltage range: 4V~36V

  • Output voltage range: 3V~30V

  • Adjustable switching frequency: 200kHz~2.1MHz

  • High efficiency even with high switching-frequency

  • Ultra-low standby current: the standby current is less than 150 μA at 30V input and 5V output.

  • With 400kHz switching frequency:

      Peak efficiency: 99.3% @ 28.8 V-in, 28 V-out, 5 A load

      Peak efficiency: 98.5% @ 28 V-in, 20 V-out, 5 A load

  • With 2.1MHz switching frequency:

      Peak efficiency: 97.4% @ 28 V-in, 20 V-out, 5 A load

  • 6A maximum continuous output current, 12A transient peak output-current


Ordering Information
Product Name Package form Marking Hazardous Substance Control Packing Type Remarks
SD59D31 FCQFN-16-3×3×0.55-0.45 D31 Halogen free Tray
SD59D31TR FCQFN-16-3×3×0.55-0.45 D31 Halogen free Tape & Reel
Documents
title Types of Size (KB) date Download the latest English version
SD59D31 0 2026-10-26 SD59D31 Brief Datasheet