SP34063A
1.5A Buck/Boost/Inverting DC-DC Regulator
February 2011
Rev. 2.1.0
GENERAL DESCRIPTION
The SP34063A is a monolithic switching
regulator control circuit containing the primary
functions required for DC-DC converters.
This device consists of an internal temperature
compensated reference, voltage comparator,
controlled duty cycle oscillator with active
current limit circuit, driver and high current
output switch. This device was specifically
designed to be used in buck, boost, and
Voltage-Inverting applications with a minimum
number of external components.
The SP34063A is available in the 8 pin NSOIC
package.
APPLICATIONS
•
Battery Charger Circuit
•
NICs/Switches/Hubs
•
ADSL Modems
•
Negative Voltage Power Supply
FEATURES
•
Supply Voltage: 3V - 36V
•
Current Limiting
•
Output Switch Current to 1.5A
•
Adjustable Output Voltage
•
Operation frequency up to 180KHz
•
Low Quiescent Current
•
Precision 2% Reference
•
Available in 8 pin NSOIC Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP34063A Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
SP34063A
1.5A Buck/Boost/Inverting DC-DC Regulator
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
Power Supply Voltage V
CC
........................................ 40V
Comparator Input Voltage ........................... -0.3V to 40V
Switch Collector Voltage .......................................... 40V
Switch Emitter Voltage (V
PIN1
=40V)........................... 40V
Switch Collector to Emitter Voltage ........................... 40V
Driver Collector Voltage........................................... 40V
Driver Collector Current (Note 2) .......................... 100mA
Switch Current ...................................................... 1.5A
Storage Temperature .............................. -65°C to 150°C
ESD Rating (HBM - Human Body Model) .................... 2kV
OPERATING RATINGS
Input Voltage Range V
IN
................................ 3.0V to 36V
Power Dissipation (T
A
=25°C - NSOIC) ..................780mW
Junction Temperature Range ....................-40°C to 150°C
Thermal Resistance
θ
JA
.....................................160°C/W
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Temperature of T
A
= 25°C only. Minimum and Maximum limits are
guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T
A
=
25°C, and are provided for reference purposes only. Unless otherwise indicated, V
CC
= 5.0V, T
A
= –40°C to 85°C.
Parameter
Oscillator
Frequency F
OSC
Charge Current I
CHG
Discharge Current I
DISCHG
Discharge to Charge Current
Ration I
DISCHG
/I
CHG
Current Limit Sense Voltage
V
IPK(sense)
Output Switch (Note 1)
Saturation Voltage,
Darlington Connection V
CE(sat)
Saturation Voltage (note 2)
DC Current Gain
Collector Off-State Current
Comparator
Threshold Voltage V
TH
Threshold Voltage Line
Regulation R
EGLINE
Input Bias Current I
IB
Total Device
Supply Current I
CC
4
mA
V
CC
=5.0V to 36V, CT=1nF, pin 7 = V
CC
Vpin5 >V
TH
1.225
1.210
1.250
1.250
1.4
-20
1.275
1.290
5
-400
V
V
mV
nA
T
A
= 25°C
T
A
= -40°C to 85°C
V
CC
= 3.0V to 36V
V
IN
= 0V
50
1.0
0.45
75
0.01
100
µA
1.3
0.7
V
V
I
SW
=1A, pin1,8 connected
I
SW
=1A, R pin8 = 82ohms to V
CC
,
forced ß=20
I
SW
=1A, V
CE
= 5V, T
A
= 25°C
V
CE
=36V
30
30
180
5.2
250
38
38
240
6.5
300
45
45
290
7.5
350
mV
KHz
µA
µA
V
PIN5
= 0V, CT = 1.0nF, T
A
= 25°C
V
CC
= 5.0V to 36V, T
A
= 25°C
V
CC
= 5.0V to 36V, T
A
= 25°C
Pin 7 to V
CC
, T
A
= 25°C
I
DISCHG
= I
CHG
, T
A
= 25°C
Min.
Typ.
Max.
Units
Conditions
Note 1: Low duty cycle pulse techniques are used during the test program to maintain junction temperature as close to
ambient temperature as possible.
Note 2: If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤ 300mA)
and high driver currents (≥ 30mA), it may take up to 2.0μs for it to come out of saturation. This condition will shorten the
© 2011 Exar Corporation
2/9
Rev. 2.1.0
SP34063A
1.5A Buck/Boost/Inverting DC-DC Regulator
off time at frequencies above 30KHz, and is magnified at high temperatures. This condition does not occur with a Darlington
configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive
condition is recommended.
Forced ß of output switch
=
I
C
Output
≥
10
I
C
Driver
−
7
mA
∗
* The 100Ω resistor in the emitter of the driver device requires about 7.0mA before the output switch conducts.
BLOCK DIAGRAM
Fig. 2: SP34063A Block Diagram
PIN ASSIGNEMENT
Fig. 3: SP34063A Pin Assignment
© 2011 Exar Corporation
3/9
Rev. 2.1.0
SP34063A
1.5A Buck/Boost/Inverting DC-DC Regulator
PIN DESCRIPTION
Name
Switch Collector
Switch Emitter
Timing Capacitor
GND
Comparator
Inverting Input
V
CC
I
PK
Sense
Driver Collector
Pin Number
1
2
3
4
5
6
7
8
Internal switch transistor collector
Internal switch transistor emitter
Timing capacitor to control the switching frequency
Ground pin for all internal circuit
Inverting input pin for internal comparator
Voltage supply
Peak Current Sense Input by monitoring the voltage drop across an external I sense
resistor to limit the peak current through the switch
Voltage driver collector
Description
ORDERING INFORMATION
Part Number
SP34063AEN-L
SP34063AEN-L/TR
Temperature Range
-40°C≤T
A
≤+85°C
-40°C≤T
A
≤+85°C
Package
NSOIC-8
NSOIC-8
Packing Quantity
Bulk
2.5K/Tape & Reel
Note 1
Lead Free
Lead Free
Note 2
© 2011 Exar Corporation
4/9
Rev. 2.1.0
SP34063A
1.5A Buck/Boost/Inverting DC-DC Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
Fig. 4: Output Switch On-Off Time
vs. Oscillator Timing Capacitor
Fig. 5: Timing Capacitor Waveform
Fig. 6: Oscillator Frequency vs. Timing Capacitor
Fig. 7: Standard Supply Current vs. Supply Voltage
Fig. 8: Emitter Follower Configuration Output Switch
Saturation vs. Emitter Current
Fig. 9: Common Emitter Configuration Output Switch
Saturation vs. Collector Current
© 2011 Exar Corporation
5/9
Rev. 2.1.0
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