L5987 STMicroelectronics, L5987 Datasheet - Page 27

• 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
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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