STEVAL-ISA052V1 STMicroelectronics, STEVAL-ISA052V1 Datasheet - Page 36

• Manufacturer Part Number: STEVAL-ISA052V1
• Description: KIT EVAL PM6675S HE CTLR 2A REG
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISA052V1

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 1.5V, 0.6 ~ 3.3V
• Current - Output: 10A, 2A
• Voltage - Input: 4.5 ~ 28 V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: PM6675
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-8426

Device description
7.2.1
36/53
A compensation capacitor Cc must be added to adjust the dynamic response of the loop.
The value of Cc is calculated according to the desired bandwidth of the LDO regulator and
depends on the value of the feedback resistors. In most of applications the pole due to the
compensation capacitor is placed at 100-200 kHz (equation 24).
Equation 24
The LIN input can be connected to the switching section output for compact solutions or to a
lower supply, if available in the system, in order to reduce the power dissipation of the LDO.
A minimum output capacitance of 20 µF (2x10 µF MLCC capacitors) is enough to assure
stability and fast load transient response.
LDO section current limit
The LDO regulator can handle up to ±2 Apk, depending on the LDO input voltage and the
LILIM pin setting. The output current is limited to ±1 A or ±2 A if the LILIM pin is connected
to SGND or AVCC respectively (
Figure 45. LDO current limit setting
The maximum current that the LDO can source depends also on the input and output
voltages. Due to the high side MOSFET of the output stage, the LDO cannot source the limit
current at high output voltages. In
can source as function of the input and output voltages. For output voltages higher than 2 V,
the maximum output current is limited as reported.
±2A CL
±1A CL
f
p
=
Figure 45
+5V
2
Figure 46
π
R (
19
⊕
).
1
R
it is shown the maximum current that the LDO
20
LILIM
)
PM6675
⋅
PM6675S
C
C
=
200
kHz
PM6675S