S-8353A20MC-IQFT2X Datasheet, PDF (2/49 Pages) Seiko Instruments Inc – BUILT-IN TRANSISTOR SWITCHING REGULATOR

STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
S-8353/8354 Series
Rev.3.0_01
 Block Diagrams
(1) A, C and H Types (Without Shutdown Function)
CONT
VOUT
Oscillation circuit
PWMcontrol circuit
or PWM / PFM
swiching control
circuit
IC internal
power supply
+
−
Soft start built-in
reference power
supply
Phase
compensation
circuit
VSS
Figure 1
(2) A and H Types (With Shutdown Function)
CONT
VOUT
Oscillation circuit
PWMcontrol circuit
or PWM / PFM
swiching control
circuit
IC internal
power supply
+
−
Soft start built-in
reference power
supply
Phase
compensation
circuit
VSS
ON / OFF
(3) D and J Types (VDD / VOUT Separate Type)
CONT
Figure 2
VDD
VOUT
Oscillation circuit _{IC internal}
power supply
PWMcontrol circuit
+
or PWM / PFM
−
swiching control
circuit
Soft start built-in
reference power
supply
Phase
compensation
circuit
VSS
Figure 3
2