EVAL5985 STMicroelectronics, EVAL5985 Datasheet - Page 21

• Manufacturer Part Number: EVAL5985
• Description: BOARD EVAL FOR L5985
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EVAL5985

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.3V
• Current - Output: 2A
• Voltage - Input: 3.3 ~ 18V
• Regulator Topology: Buck
• Frequency - Switching: 500kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L5985
• Input Voltage: 2.9 V to 18 V
• Output Voltage: 0.6 V to 16 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: L5985
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: Step Down Switching Regulator
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: L5985
• Other names: 497-6387; EVAL5985

L5985
Application information
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (F
/3.5), anyway lower than 100 kHz if the F
is set higher than 500 kHz.
SW
SW
= 2 A, L = 15 μH, C
= 22 μF, ESR < 1 mΩ,
For example with V
= 3.3 V, V
= 12 V, I
OUT
IN
O
OUT
the type III compensation network is:
,
,
,
,
,
,
R
4.99kΩ
R
1.1kΩ
R
150Ω
R
4.99kΩ
C
3.3nF
C
10nF
C
100pF
=
=
=
=
=
=
=
1
2
3
4
3
4
5
In
Figure 12
is shown the module and phase of the open loop gain. The bandwidth is about
75 kHz and the phase margin is 47°.
Doc ID 13006 Rev 5
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