S-8540 Datasheet, PDF (28/36 Pages) Seiko Instruments Inc – STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8540/8541 Series
Rev.3.2_00
„ Reference Data
This reference data is intended to help you select peripheral components to be externally connected to the
IC. Therefore, this information provides recommendations on external components selected with a view to
accommodating a wide variety of IC applications. Characteristic data is duly indicated in the table below.
Table 9. External components list for efficiency
(Small and thin application using 1.3 mm or less tall components, maximum load current : I_OUT = 0.9 A)
No.
Product Name
Output
Voltage
Modulation
f_OSC
Inductor
Transistor Diode Output Capacitor
1.1 S-8540A33FN
PWM
3.3 V
1.2 S-8541A33FN
PWM/PFM
1.3 S-8540A25FN
PWM
2.5 V
600kHz LDR655312T-4R7 CPH6301 RB491D F920J476MB × 2
1.4 S-8541A25FN
PWM/PFM
1.5 S-8540A18FN
PWM
1.8 V
1.6 S-8541A18FN
PWM/PFM
Table 10 External components list for efficiency
(High efficiency application using 3.0mm or less tall components, maximum load current : I_OUT = 1.0 A)
No.
Product Name
Output
Voltage
Modulation
f_OSC
Inductor
Transistor Diode Output Capacitor
1.7 S-8540C33FN
PWM
3.3 V
1.8 S-8541C33FN
PWM/PFM
1.9 S-8540C25FN
PWM
2.5 V
300kHz CDRH6D28-220 CPH6301 RB491D F931A476MC × 1
1.10 S-8541C25FN
PWM/PFM
1.11 S-8540C18FN
PWM
1.8 V
1.12 S-8541C18FN
PWM/PFM
Table 11 External components list for ripple voltage
No.
Product
Name
Output
Voltage
Modulation
f_OSC
Inductor
Transistor Diode
Output
Capacitor
2.1 S-8540A33FN
PWM
3.3 V
2.2 S-8541A33FN
PWM/PFM
600kHz LDR655312T-4R7 CPH6301 RB491D F920J476MB × 2
2.3 S-8540A18FN
PWM
1.8 V
2.4 S-8541A18FN
PWM/PFM
2.5 S-8540C33FN
PWM
3.3 V
2.6 S-8541C33FN
PWM/PFM
300kHz CDRH6D28-220 CPH6301 RB491D F931A476MC × 1
2.7 S-8540C18FN
PWM
1.8 V
2.8 S-8541C18FN
PWM/PFM
28
Seiko Instruments Inc.