S-8365AAABA-M5T1Y2 Datasheet, PDF (2/63 Pages) Seiko Instruments Inc – PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8365/8366 Series
Rev.2.1_01
 Block Diagram
1. With UVLO function and short-circuit protection
L
SD
V_OUT
VDD
M1
EXT
V_IN C_IN
ON/OFF
UVLO
Triangular Wave
Oscillation Circuit
PWM Comparator
PWM control, or
PWM / PFM
Switching Control
Circuit
+
−
Error
Amplifier
+
−
C_FB
FB
Timer Latch
Short-Circuit
Protection
ON/OFF
Circuit
Reference Voltage
with Soft-Start Circuit
CSP
VSS
Figure 1
2. With UVLO function, without short-circuit protection
L
SD
R_FB1
R_FB2
C_OUT
V_OUT
VDD
M1
EXT
V_IN C_IN
ON/OFF
UVLO
Triangular Wave
Oscillation Circuit
PWM Comparator ^Error
C_FB
Amplifier
PWM control, or
PWM / PFM
Switching Control
+
−
+
−
FB
Circuit
ON/OFF
Circuit
Reference Voltage
with Soft-Start Circuit
Figure 2
VSS
R_FB1
R_FB2
C_OUT
2