L5987 STMicroelectronics, L5987 Datasheet - Page 27
L5987
Manufacturer Part Number
L5987
Description
IC REG STEPDOWN 3A 8VFQFPN
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet
1.L5987TR.pdf
(41 pages)
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
Available stocks
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L5987
Equation 29
For example with V
ESR = 35 mΩ, the type II compensation network is:
In
32 kHz and the phase margin is 45°.
Figure 16
is shown the module and phase of the open loop gain. The bandwidth is about
R
1
OUT
=
1.5kΩ
= 3.3 V, V
,
Doc ID 14972 Rev 3
R
C
2
IN
5
=
= 12 V, I
=
330Ω
------------------------------------------------------------- -
2π R
⋅
,
4
O
R
⋅
= 3 A, L = 10 μH, C
4
C
C
=
4
4
⋅
10kΩ
4 BW
⋅
,
–
C
1
4
=
47nF
OUT
Application information
,
= 330 μF,
C
5
=
82pF
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