For more information, please visit the product page. date 11/01/2012 page 1 of 5 SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER 0.25 W isolated output industry standard 8 pin SMT package single unregulated output from 3.3~48 V 1,000 V isolation short circuit protection efficiency up to 65% U • • • • • • ED FEATURES RoHS typ (Vdc) output voltage range (Vdc) (Vdc) 5 4.5~5.5 3.3 VBT0.25-S5-S5-SMT 5 4.5~5.5 5 min (mA) max (mA) output power ripple and noise1 efficiency max (W) max (mVp-p) typ (%) 8 76 0.25 100 62 5 50 0.25 100 64 TI VBT0.25-S5-S3.3-SMT output current N input voltage MODEL VBT0.25-S5-S9-SMT 5 4.5~5.5 9 3 28 0.25 100 65 VBT0.25-S5-S12-SMT 5 4.5~5.5 12 2 21 0.25 100 67 5 4.5~5.5 15 2 17 0.25 100 66 12 10.8~13.2 5 5 50 0.25 100 65 VBT0.25-S12-S9-SMT 12 10.8~13.2 9 3 28 0.25 100 64 VBT0.25-S12-S12-SMT 12 10.8~13.2 12 2 21 0.25 100 63 VBT0.25-S12-S15-SMT 12 10.8~13.2 15 2 17 0.25 100 64 VBT0.25-S24-S5-SMT 24 21.6~26.4 5 5 50 0.25 100 60 VBT0.25-S24-S9-SMT 24 VBT0.25-S24-S15-SMT 9 3 28 0.25 100 61 21.6~26.4 12 2 21 0.25 100 63 24 21.6~26.4 15 2 17 0.25 100 65 1. 20 MHz bandwidth oscilloscope 2. All specifications measured at TA=25°C, humidity <75%, nominal input voltage and rated output load unless otherwise specified. IS C Notes: 21.6~26.4 24 O VBT0.25-S24-S12-SMT N VBT0.25-S5-S15-SMT VBT0.25-S12-S5-SMT D PART NUMBER KEY VBXT0.25 - SXX - SXX -SMT- X Output Voltage Base Number X indicates ALT PIN configuration, see page 3 Input Voltage Packaging Style cui.com Package Options "blank" = standard TR = Tape & Reel For more information, please visit the product page. CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER date 11/01/2012 │ page 2 of 5 INPUT conditions/description min typ max units operating input voltage 5 V model 12 V model 24 V model 4.5 10.8 21.6 5 12 24 5.5 13.2 26.4 Vdc Vdc Vdc parameter conditions/description min typ max units line regulation for Vin change of 1% 3.3 V model all other models 1.5 1.2 % % load regulation measured from 10% load to full load 3.3 V model 5 V model 9 V model 12 V model 15 V model 20 15 15 15 15 % % % % % OUTPUT switching frequency temperature coefficient TI PROTECTIONS parameter conditions/description short circuit protection SAFETY AND COMPLIANCE U see derating curves 100% load, 5 and 12 V input 100% load, 24 V input 15 12.8 8.3 6.8 6.3 N voltage accuracy ED parameter min kHz kHz ±0.03 %/°C typ units 1 s max units for 1 minute at 1 mA max. 1,000 Vdc isolation resistance at 500 Vdc 1,000 MΩ safety approvals UL 60950-1 (E222736) 3,500,000 hours N conditions/description isolation voltage O MTBF typ max parameter RoHS compliant min 110 700 yes IS C ENVIRONMENTAL parameter conditions/description min typ max units operating temperature -40 85 °C storage temperature -55 125 °C storage humidity non-condensing temperature rise at full load lead temperature 1.5 mm from case for 10 seconds D 15 cui.com 95 % 25 °C 260 °C For more information, please visit the product page. CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER date 11/01/2012 │ page 3 of 5 DERATING CURVES 80 60 40 20 -40 -20 0 20 40 60 85 105 U Ambient Temperature (°C) MECHANICAL conditions/description dimensions 0.500 x 0.441 x 0.246 (12.70 x 11.20 x 6.25 mm) case material plastic (UL94-V0) N 4.13 [0.163] 6.25 [0.246] 6.00 [0.236] O 7.50 [0.295] inch 1.35 g Top view,grid:2.54mm(0.1inch) VBXT0.25-SMT VBT0.25-SMT 12.70 [0.500] 7.62 [0.300] 11.2 MAX [0.441] units R EC OM MEND ED F OO TPRIN T (Side view) IS C D max First Angle Projection 2.54 0.25 [0.100] [0.100] 8 7 6 5 8 5 1 2 3 4 1 2 4 (Top view) 2.54f0.1 [0.100 f0.004] A 7.19 [0.283] PIN CONNECTIONS 0.6f0.05 [0.024f0.002] 6.76 [0.266] 1.85MAX [0.073] typ TI weight units: mm [inches] tolerance: ±0.15 [±0.006] pin section tolerance: ±0.10 [±0.004] min N parameter MECHANICAL DRAWING ED Load (%) 100 A 0.50 [0.020] 1.35MAX [0.053] 5.00 0.3 [0.012] cui.com Ⱦ PIN FUNCTION ALT FUNCTION 1 GND GND 2 +Vin +Vin 3 NC No PIN 4 0V 0V 5 +Vo +Vo 6 NC No PIN 7 NC No PIN 8 NC NC For more information, please visit the product page. CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER date 11/01/2012 │ page 4 of 5 APPLICATION NOTES Requirement on Output Load In order to ensure the product operates efficiently and reliably, make sure the specified range of input voltage is not exceeded and the minimum output load is not less than 10% load. If the actual load is less than the specified minimum load, the output ripple may increase sharply while its efficiency and reliability will reduce greatly. If the actual output power is very small, please add an appropriate resistor as extra loading. 2. Overload Protection Under normal operating conditions, the output circuit of these products has no protection against over-current and short-circuits. The simplest method is to connect a self-recovery fuse in series at the input end or add a circuit breaker to the circuit. 3. Filtering In some circuits which are sensitive to noise and ripple, a filtering capacitor may be added to the DC/DC output end and input end to reduce the noise and ripple. However, the capacitance of the output filter capacitor must be proper. If the capacitance is too big, a startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the greatest capacitance of its filter capacitor sees the external capacitor table. To get an extremely low ripple, an “LC” filtering network may be connected to the input and output ends of the DC/DC converter, which may produce a more significant filtering effect. It should also be noted that the inductance and the frequency of the “LC” filtering network should be staggered with the DC/DC frequency to avoid mutual interference (Figure 1). L Figure 1 +Vin Cin -Vin L DC DC +Vout Cout TI -Vout Output Voltage Regulation and Over-voltage Protection Circuit The simplest device for output voltage regulation, over-voltage and over-current protection is a linear voltage regulator with overheat protection that is connected to the input or output end in series (Figure 2). DC DC -Vin O Figure 2 +Vin -Vout REG +Vout DC DC -Vin -Vout Reflow Profile Peak Temperature 260°C for 10 Sec. Max 250 200 Temperature (°C) D +Vout REG N +Vin IS C 4. N U ED 1. 90 Sec. max (>220°C) 150 100 50 0 Time (Seconds) cui.com 220°C For more information, please visit the product page. CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER date 11/01/2012 │ page 5 of 5 REVISION HISTORY description date 03/06/2008 1.0 initial release 1.01 new template applied, V-Infinity branding removed 1.02 added TR package option ED rev. 09/07/2012 11/01/2012 D IS C O N TI N U The revision history provided is for informational purposes only and is believed to be accurate. Headquarters 20050 SW 112th Ave. Tualatin, OR 97062 800.275.4899 Fax 503.612.2383 cui.com [email protected] CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website. CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.