L5987 STMicroelectronics, L5987 Datasheet - Page 35

• Manufacturer Part Number: L5987
• Description: IC REG STEPDOWN 3A 8VFQFPN
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5987

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 V ~ 18 V
• Current - Output: 3A
• Frequency - Switching: 250kHz
• Voltage - Input: 2.9 V ~ 18 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-VFQFN, Exposed Pad
• 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 %
• Low Dropout Operation: 100 % duty cycle
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L5987
Figure 29. Load regulation
Figure 31. Load transient:
Figure 33. Short-circuit behavior
OUT 10V/div
OUT 10V/div
OUT 10V/div
OUT 10V/div
V
V
V
V
V
V
100mV/div
100mV/div
AC coupled
AC coupled
OUT
OUT
OUT
OUT
I
I
L
L
OUT
OUT
1.2
0.8
0.6
0.4
0.2
1A/div
1A/div
1
0
1V/div
0.5V/div
1V/div
0.5V/div
0
SHORTED OUTPUT
SHORTED OUTPUT
SHORTED OUTPUT
SHORTED OUTPUT
0.5
from 0.4 A to 3 A
I
I
I
I
L
L
L
L
1A/div
1A/div
1A/div
1A/div
Time base 100us/div
Time base 100us/div
1
I
O
1.5
[A]
Doc ID 14972 Rev 3
Time base 5ms/div
Time base 5ms/div
Time base 5ms/div
Time base 5ms/div
2
V
V
2.5
C
C
L=3.8uH
L=3.8uH
F
F
CC
CC
SW
SW
OUT
OUT
=520k
=520k
=12V
=5V
=47uF
=47uF
3
Figure 30. Line regulation
Figure 32. Soft-start
0.8
0.6
0.4
0.2
1
0
2
4
I
I
I
I
L
L
L
L
1A/div
1A/div
1A/div
1A/div
6
Time base 1ms/div
Time base 1ms/div
Time base 1ms/div
Time base 1ms/div
Application information
8
V
CC
10
[V]
12
I
I
I
O
O
O
14
=1A
=2A
=3A
V
V
V
V
OUT
OUT
OUT
OUT
1V/div
0.5V/div
1V/div
0.5V/div
16
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