LTM2894

13

Rev A

For more information www.analog.com

APPLICATIONS INFORMATION

EMI

Radiated emissions have been measured for the LTM2894

using a gigahertz transverse electromagnetic (GTEM) cell

without a USB cable attached. The performance shown in

Figure 5. Low Noise, Low EMI, 5kVRMS, Reinforced USB Isolator Demo Circuit

Figure 7 EMI Plot was achieved with the layout structure

in Figure 6. Results are corrected per IEC 61000-4-20.

VIN

LT3065-5

GND

SHDN

IN

IN

PWRGD

IMAX

SENSE

OUT

OUT

ADJ

BYP

1

2

5

4

3

11

10

9

8

7

6

VBUS2

J1

LTM2894

VCC2

VIN

VBUS

VLO

D1–

B6

A6

B5

A5

B4

A4

B3

A3

B2

A2

4

1

B1

A1

3

2

GND

VBUS

D+

D–

VLO2

D1+

JP1

VCC

5V TO 36V

D1

MBR0580S1

W6

X6

W5

X5

W4

X4

W3

X3

W2

X2

W1

X1

JP2

GND

JP3

VCC2

INPUT = 6V TO 36V

OUTPUT = ~6V, 200mA

JP4

GND2

C6

4.7µF

1210

R10

1.5k

C7

22nF

J2

D2– D2+

GND

VBUS

GND

GND

GND

VLO

GND

ON

GND

D1+

GND

D1–

GND2

VBUS2

GND2

GND2

GND2

VLO2

GND2

ON2

GND2

D2+

GND2

D2–

4

1

3

2

GND

VBUS

VBUS2

D+

D–

D3

MBR0580S1

D4

MBR0580S1

L1

10µH VCC2

TR2

1:1.7

C4

47pF

R8

249

0805

TR1

1:1.1

6

5

4

6

5

4

1

2

3

1

2

3

C3

4.7µF

1210

50V

C2

180pF

C8

1nF

LT3999

4

3

2

1

UVLO VIN RBIAS SWA

R1

49.9k

R2

464k

5

OVLO/DC

7

8

10

11 GND

RT SYNC

PINS NOT USED IN LT3999

CIRCUIT: ILIM/SS, RDC

SWB

2894 F05

R3, 28k

R1

100k

R5

39

0805

C9

10nF

C10

10µF

0805

C5

47pF

R9

249

0805

TR1: WURTH ELEKTRONIK 760390012

TR2: WURTH ELEKTRONIK 750313769

C10

4.7µF

2312

50V

D2

MBR0580S1

R7

100k

ON

R6

100k