S-8337AAAA-P8T1G Datasheet, PDF (2/51 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.4.0_01
 Block Diagram
L
VIN
M1
C_IN
EXT
SD
RDuty (S-8337) or
ON/OFF (S-8338)
ROSC
UVLO
+
PWM ^−
comparator
Timer latch
short-circuit
protection circuit
Oscillator
Maximum duty circuit
+ _{Error amplifier}
−
Reference voltage
(1.0 V) soft-start
circuit
V_OUT
CFB RFB1
C_L
FB
RFB2
VSS
CSP
CC
RZ CZ
Figure 1 Block Diagram
2