L5987TR STMicroelectronics, L5987TR Datasheet - Page 16

• Manufacturer Part Number: L5987TR
• Description: IC REG SW 3A STEPDOWN 8-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5987TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 18 V
• Current - Output: 3A
• Frequency - Switching: 250kHz
• Voltage - Input: 2.9 ~ 18 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-VFQFN, 8-VFQFPN
• Power - Output: 1.5W
• Output Voltage: 0.6 V
• Output Current: 3 A
• Output Power: 1.5 W
• Input Voltage: 2.9 V to 18 V
• Switching Frequency: 250 KHz
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• For Use With: 497-8369 - BOARD EVALUATION FOR L5987
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8494-2

Functional description
Note:
16/41
With V
the duty is D = 73%, so the maximum DC output current results 2.926 A, higher than the
desired current.
Figure 9.
For duty cycles lower than 69%, the RMS current does not limit the maximum DC output
current of 3 A. For duty cycles higher than the 69% the maximum DC output current is
limited by the RMS current (see
IN
= 3.3 V, V
Maximum DC output current for VQFN package vs duty cycle
OUT
= 1.8 V, I
Doc ID 14972 Rev 3
O
Equation
= 2.7 A,
R
5)
DS(on)
= 220 mΩ, V
F
= 0.35 V and DCR = 30 mΩ,
L5987