Product # BQ55090QTA27

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2BQ559J Rev. C

04/02/09

Page 6

Input:

Output:

Current:

Package:

36-55 V

9.6 V

27A

Quarter-brick

Technical Specification

94.0

94.5

95.0

95.5

96.0

96.5

97.0

100

200

300

400

Air Flow (LFM)

25º C

40º C

55º C

70

75

80

85

90

95

100

0

10

20

30

40

Load Current (A)

35 Vin

48 Vin

55 Vin

0

2

4

6

8

10

12

14

0

10

20

30

40

Load Current (A)

35 Vin

48 Vin

55 Vin

4

5

6

7

8

100

200

300

400

Air Flow (LFM)

25º C

40º C

55º C

0

10

20

30

40

25

40

55

70

85

Ambient Air Temperature (ºC)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

Semiconductor junction temperature is

within 1°C of surface temperature

BQ55090QTA27 Figures

Figure 1: Efficiency at nominal output voltage vs. load current for

minimum, nominal, and maximum input voltage at 25°C.

Figure 2: Efficiency at nominal output voltage and 60% rated power

vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C

(nominal input voltage).

Figure 3: Power dissipation at nominal output voltage vs. load current for

minimum, nominal, and maximum input voltage at 25°C.

Figure 4: Power dissipation at nominal output voltage and 60% rated

power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and

55°C (nominal input voltage).

Figure 5: Maximum output power-derating curve vs. ambient air

temperature for airflow rates of 100 LFM through 400 LFM with air

flowing from pin 1 to pin 3 (nominal input voltage).

Figure 6: Thermal plot of converter at 30 A load current (268 W) with 55°C

air flowing at the rate of 200 LFM. Air is flowing across the converter

from pin 1 to pin 3 (nominal input voltage).