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S-8365 Datasheet, PDF (2/63 Pages) Seiko Instruments Inc – STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or 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.1.1_00
„ Block Diagram
1. With UVLO function and short-circuit protection
L
SD
VOUT
VDD
M1
EXT
VIN CIN
ON/OFF
UVLO
Triangular Wave
Oscillation Circuit
PWM Comparator Error
CFB
PWM control, or
Amplifier
PWM / PFM
Switching Control
Circuit
+
−
+
−
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
RFB1
RFB2
COUT
VOUT
VDD
M1
EXT
VIN CIN
ON/OFF
UVLO
Triangular Wave
Oscillation Circuit
PWM Comparator Error
CFB
Amplifier
PWM control, or
PWM / PFM
Switching Control
+
−
+
−
FB
Circuit
ON/OFF
Circuit
Reference Voltage
with Soft-Start Circuit
Figure 2
VSS
RFB1
RFB2
COUT
2
Seiko Instruments Inc.