The LM34063AQ8 is a monolithic control circuit containing the primary functions required for
DC-to-DC converters. This device consists of an internal temperature compensated reference,
comparator, control- led duty cycle oscillator with an active current limit circuit, driver and high current
output switch.
Features
•
3V to 40V Input Voltage Operation
•
Internal 1.6A Peak Current Switch
•
Internal ±1.8% Reference
•
Low Quiescent Current at 1.6mA
•
Frequency Operation from 100Hz~100KHz
•
Current Limiting
Applications
•
Saver for Cellular Phone
•
DC-DC Converter Module
Ordering Information
Device
LM34063AQ8
Package
SOP-8
(Pb-free lead plating package)
Shipping
2500 pcs / tape & reel, 3000 pcs/tape & reel
Typical Application Circuit
Fig1.Saver Circuit for Cellular Phone
LM34063A
RSC
V
in
8
7
6
5
1
2
3
4
L1
200μH
V
out
D1
1N5819
C
out
220μF
C
T
470pF
C1
100μF
RA
5.6kΩ
RB
33kΩ
LM34063AQ8
CYStek Product Specification
CYStech Electronics Corp.
Pin Connections
8
7
6
5
Spec. No. : C501Q8
Issued Date : 2003.03.21
Revised Date :2011.09.06
Page No. : 2/9
1
2
3
4
Pin1:Switch Collector
Pin2:Switch Emitter
Pin3:Timing Capacitor
Pin4:Gnd
Pin5:Comparator Inverting Input
Pin6:Vcc
Pin7:Ipk Sense
Pin8:Driver Collector
Absolute Maximum Rating
Supply Voltage ....................................................................................................................................... 40 V
Comparator Input Voltage Range ........................................................................................... -0.3 V ~ 40 V
Switch Collector Voltage ....................................................................................................................... 40 V
Switch Emitter Voltage .......................................................................................................................... 40 V
Switch Collector to Emitter Voltage ...................................................................................................... 40 V
Driver Collector Voltage ........................................................................................................................ 40 V
Switch Current ....................................................................................................................................... 1.6A
Power Dissipation @ Ta=25°C......................................................................................................... 625 mW
Thermal Resistance Junction to Air............................................................................................. 160
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