# Increasing S6BP202A Rated Output Current under Low Input Voltage Condition – KBA226161

Version 3

Author: AtsushiT_61           Version: **

Translation - Japanese: 低入力電圧条件下でのS6BP202A定格出力電流の増加 – KBA226161 - Community Translated (JA)

Question:

How can the rated output current of S6BP202A be increased under low input voltage condition?

Lower the switching frequency to increase S6BP202A’s rated output current at low input voltage.

Figure 1 shows the IVOUT vs VVIN graph for the default switching frequency of 2.1 MHz. For example, the rated output current is approximately 0.7 A when VVIN = 3.5V (Ta=+25°C).

Figure 1. IVOUT vs VVIN Graph

By setting the switching frequency to 200 kHz, the rated output current is increased to 1.2 A when VVIN = 3.5V (Ta=+25°C), as shown in Figure 2.

Figure 2. IVOUT vs VVIN Graph

To set the switching frequency to 200 kHz, use the following component values:

• Setting Resistor (RT) = 270 kΩ
• Inductor (L) = 22 μH (CLF12577NIT-220M-D)
• Input Capacitor (CIN) = 10 μF
• Select either of the option for Output Capacitor (COUT):

Option 1

 Item Amount Ceramic CGA6P1X7R1C226M250AC 8

Option 2

 Item Amount Polymer electrolytic HHXD160ARA151MF80G 1 Ceramic CGA6P1X7R1C226M250AC 1

See section 2.1.3 in AN99497 Designing a Power Management System with S6BP201A, S6BP202A, and S6BP203A for details on how to set the switching frequency.