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Toshiba expands lineup of SBD, which uses a compact package with high heat dissipation ability that allows easier thermal design, by 30 V/ 40 V products: CUHS20F40, CUHS20F30, CUHS15F40, CUHS15F30, CUHS20S40, CUHS20S30, CUHS15S40, CUHS15S30

Product News 2019-07

The package photograph of Toshiba expands lineup of SBD, which uses a compact package with high heat dissipation ability that allows easier thermal design, by 30 V/ 40 V products: CUHS20F40, CUHS20F30, CUHS15F40, CUHS15F30, CUHS20S40, CUHS20S30, CUHS15S40, CUHS15S30.

Toshiba Electronic Devices & Storage Corporation ("Toshiba ") has launched eight 30 V/40 V Schottky Barrier Diodes (SBD): “CUHSxxF40”, “CUHSxxF30”, “CUHSxxS40” and “CUHSxxS30” which are suitable for voltage boosting circuits to drive LCD backlights of mobile devices such as smartphones, tablets and laptop PCs, expanding the lineup.

Typically, DC-DC boost converter ICs are used in voltage-boosting circuits for driving backlight LEDs, and the drive voltage needs to be boosted to around 25 V; the SBDs used for the boost converter circuits are sometimes configured as external components instead of being incorporated in the ICs.
Specifically, the new product CUHS20F40, which aims to satisfy both forward voltage and reverse current requirements, features a typical forward voltage of 0.39 V[1], an approximate 35 % reduction of the forward-voltage compared with the conventional product CUS10F40; CUHS20S40 features a typical forward voltage of 0.32 V[1], contributing to the improvement of power efficiency by further reducing the forward voltage compared with CUHS20F40.

As SBDs used for boost converters require different device characteristics depending on the output voltage, output current, and operating frequencies, it is important to select appropriate SBDs for the circuit conditions.
The new products include a low forward-voltage type satisfying both the forward voltage and reverse current requirements and an ultra low forward voltage type that has further reduced the forward voltage, offering products suitable for SBDs used as external components for boost converter ICs to drive backlight LEDs.

By using the US2H package (package code: SOD-323HE) which is compact (typical 2.5×1.4×0.6 mm) and features a low thermal resistance[2], the new products can meet the market requirements such as smaller and thinner mobile devices without degrading performance.

Notes:
[1] @IF=1 A
[2] Mounted on an FR4 board (25.4×25.4×1.6 mm, Cu Pad: 645 mm2)

Features

Case of CUHS20F40

  • Low forward voltage:
      VF=0.39 V (typ.) @IF=1 A
      VF=0.47 V (typ.) @IF=2 A
  • Low reverse current: IR=60 μA (max) @VR=40 V
  • Small surface mount package:
      High-density mounting with US2H package (Package code: SOD-323HE)

Applications

  • Power supplies for mobile devices, home appliance equipment and industrial equipment
     (Rectification and backflow prevention, etc.)

Product Specifications

(@Ta=25 °C)

Part
number
Type Absolute
maximum ratings
Electrical characteristics Package
Reverse
voltage
VR
(V)
Average
rectified
current
IO
(A)
Forward
voltage
VF
typ.
(V)
Reverse
current
IR
max
@VR=40 V
(μA)
Name
(Package code)
Size
typ.
(mm)
@IF=1 A @IF=2 A
CUHS20F40 Low forward
voltage
40 2 0.39 0.47 60 US2H
(SOD-323HE)
2.5×1.4×0.6
CUHS15F40 40 1.5 0.49 0.57[3] 50
CUHS20F30 30 2 0.35 0.40 60[4]
CUHS15F30 30 1.5 0.42 0.46[3] 50[4]
CUHS20S40 Ultra-low
forward
voltage
40 2 0.32 0.40 300
CUHS15S40 40 1.5 0.38 0.45[3] 200
CUHS20S30 30 2 0.28 0.34 500[4]
CUHS15S30 30 1.5 0.33 0.37[3] 500[4]

Notes:
[3] @IF=1.5 A
[4] @VR=30 V

Internal Circuit

The illustration of internal circuit of Toshiba expands lineup of SBD, which uses a compact package with high heat dissipation ability that allows easier thermal design, by 30 V/ 40 V products: CUHS20F40, CUHS20F30, CUHS15F40, CUHS15F30, CUHS20S40, CUHS20S30, CUHS15S40, CUHS15S30.

Application Circuit Examples

The illustration of application circuit examples of Toshiba expands lineup of SBD, which uses a compact package with high heat dissipation ability that allows easier thermal design, by 30 V/ 40 V products: CUHS20F40, CUHS20F30, CUHS15F40, CUHS15F30, CUHS20S40, CUHS20S30, CUHS15S40, CUHS15S30.

The application circuits shown in this document are provided for reference purposes only. Thorough evaluation is required, especially at the mass-production design stage. Providing these application circuit examples does not grant any license for industrial property rights.

Characteristic Curve

The illustration of characteristic curve of Toshiba expands lineup of SBD, which uses a compact package with high heat dissipation ability that allows easier thermal design, by 30 V/ 40 V products: CUHS20F40, CUHS20F30, CUHS15F40, CUHS15F30, CUHS20S40, CUHS20S30, CUHS15S40, CUHS15S30.

Information in this document, including product prices and specifications, content of services and contact information, is correct on the date of the announcement but is subject to change without prior notice.

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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.