PM6685 STMicroelectronics, PM6685 Datasheet - Page 38

• Manufacturer Part Number: PM6685
• Description: IC CTLR DUAL SYNC STDN 5X5VFQFPN
• Manufacturer: STMicroelectronics

Specifications of PM6685

• Applications: Controller, Notebook Power System
• Voltage - Input: 6 ~ 28 V
• Number Of Outputs: 2
• Voltage - Output: -3.3V, 5V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN, 32-VFQFPN
• Output Voltage: 5 V, 3.3 V
• Output Current: 0.1 A
• Input Voltage: 5.5 V to 28 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 10 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Monitoring and protections
38/48
Equation 33
Example:
5 V section, f
RESR = 30 mΩ. We choose CINT=1 nF by equations 31, 32 and Cfilt=47 pF, RINT=1.8 kΩ
by eq.26,27. C=6.8 nF by Eq.33. Then R=22 kΩ (eq.34) and R1=1 kΩ (eq.35).
SW
=200 kHz, L=4.7 µH, Cout=100 µF ceramic (Rout~0 Ω). We design
Doc ID 11674 Rev 8
R
1
=
R
R
×
−
⎛
⎜ ⎜
⎝
C
C
×
×
π
π
1
1
×
×
f
f
Z
Z
⎞
⎟ ⎟
⎠
PM6685