S34063 Datasheet, PDF (1/6 Pages) Suntac Electronic Corp. – DC-to-DC CONVERTER CONTROL CIRCUITS

1.5 A, Step−Up/Down/
Inverting Switching
Regulators
The STC 34063 Series is a monolithic control circuit containing the
primary functions required for DC−to−DC converters. These devices
consist of an internal temperature compensated reference, comparator,
controlled duty cycle oscillator with an active current limit circuit,
driver and high current output switch. This series was specifically
designed to be incorporated in Step−Down and Step−Up and
Voltage−Inverting applications with a minimum number of external
components.
• Operation from 2.5 V to 30 V Input
• Low Standby Current
• Current Limiting
• Output Switch Current to 1.5 A
• Output Voltage Adjustable from 1.25 to 30V
• Frequency Operation from 100Hz to 100 kHz
• Precision 1%Reference
Drive ⁸
Collector
I_pk ⁷
Sense
6
V_CC
Comparator ⁵
Inverting
Input
S Q ^Q2
R
Q1
100
I_pk
Oscillator
C_T
Comparator
+
−
1.25 V
Reference
Regulator
(Bottom View)
1
Switch
Collector
2 _Switch
Emitter
3 _Timing
Capacitor
4
GN
D
This device contains 51 active transistors.
Figure 1. Representative Schematic Diagram
8
1
8
1
PDIP−8
SO−8
PIN CONNECTIONS
Switch
Collector
1
Switch
Emitter
2
Timing ₃
Capacitor
GN 4
D
8
Driver
Collector
7 I_pk Sense
6 V_CC
Comparator
5 _Inverting
Input
(Top View)
1
S34063