DESCRIPTION APPLICATIONS FEATURES SCHEMATIC DIAGRAM

RS7805/RS7812
1.0A Low Dropout Positive Voltage Regulator
DESCRIPTION
The RS7805 and RS7812 can provide local on-card
regulation, eliminating the distribution problems
associated with single point regulation. Each employs
internal current limiting, thermal shut-down and safe
operating area protection, making it essentially
indestructible. If adequate heat sinking is provided,
they can deliver over 1A output current. Although
designed primarily as fixed voltage regulators, these
devices can be used with external components to
obtain adjustable voltages and currents.
FEATURES




Output current in excess of 1A
Output voltages of 5V,12V
Internal short-circuit current limiting & thermal
overload protection
Guaranteed in extended temperature range
APPLICATIONS





SCSI-2 active termination
High efficiency linear regulators
5V to 3.3V voltage converter
Battery charger
Battery management circuits for notebook and
palmtop PCs
 Core voltage supply: FPGA, PLD, DSP, CPU
SCHEMATIC DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
RS7805/RS7812
APPLICATION CIRCUITS
Circuit for Increasing Output Voltage Constant Current Regulator V IN
1
V OUT
3
RS78XX
V
IN
1
Series
V
3
RS78XX
OUT
Series
2
R1
0.33uF
2
IB
R
1
0.33uF
I R1
0.1uF
10uF
R
0.1uF
10uF
2
VOUT=VOUT(IC)+VZ I1=VOUT(IC)/R1 VOUT=VOUT(IC)(1+R2/R1)+R2*IB Adjustable Output Regulator V IN
1
RS78XX
High Output Current with Short‐circuit Protection V IN
R sc
Q1
V OUT
3
Series
R1
Q2
1
0.1uF 10uF
IB
Series
2
0.33uF
V OUT
3
RS78XX
+
2
R1
0.33uF
R2
0.1uF
10uF
R1VBE1/IB(max) RSC=VBE2/ISC, ISC: Short‐Circuit Current VOUT=VOUT(IC)(1+R2/R1) ORDER INFORMATION
Part Number
RS7805E
RS7812E
V1.0
VOUT
5V0.15V
12V0.36V
2
Package
TO-220AB
April 2013
RS7805/RS7812
PIN ASSIGNMENTS
TO-220-3
PIN DESCRIPTION
Package
TO-220-3
Pin No.
1
2, 4
3
Pin Name
VIN
GND
VOUT
Description
Regulator Input Pin
Ground Pin
Regulator Output Pin
ABSOLUTE MAXIMUM RATINGS
Parameter
Input Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Junction Temperature
Symbol
VIN
PD
TOPR
TSTG
TJ
Maximum
40
Internally limited (Note)
0 to 125
-40 to 150
150
Symbol
Rth(j-c)
Rth(j-a)
TO-220AB
12.5
47
Unit
V
W
o
C
o
C
o
C
Note:
o
TA=25 C, TO-220AB: 2.7W
THERMAL DATA
Characteristic
Thermal Resistance Junction-Case
Thermal Resistance Junction-Ambient
V1.0
3
Unit
C/W
o
C/W
o
April 2013
RS7805/RS7812
RS7805 SERIES ELECTRICAL CHARACTERISTICS
VIN=10V, IOUT=500mA, CIN=0.33uF, COUT=0.1uF, 0CTJ125C (unless otherwise specified)
Parameter
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Quiescent Current
Change
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Output Voltage Drift
Symbol
Conditions
TJ=25C, IOUT=500mA
5mAIOUT1A
7VVIN25V, POUT15W
TJ=25C, 7VVIN25V
VO
TJ=25C, 8VVIN12V
TJ=25C, 5mAIOUT1A
VO
TJ=25C, 250mAIOUT750mA
IB
IOUT=5mA, TJ=25C
IOUT=500mA, 7VVIN25V, TJ=25oC
IB
5mAIOUT1A, VIN=10V, TJ=25oC
B=10Hz~100KHz, IOUT=50mA,
eN
TJ=25C
10VVIN18V, f=120Hz, IOUT=50mA,
RR
TJ=25oC
VD
TJ=25C, IOUT=1A
RO
f=1KHz
ISC
TJ=25C
VO/T 0oCTJ125oC
VO
Min.
4.85
RS7805E
Typ.
5
Units
Max.
5.15
V
4.85
5
5.15
-
3
1
15
5
3.9
-
50
25
100
50
8
1.3
0.5
-
50
-
uV/VO
57
73
-
dB
-
2
17
2.3
-
2.5
2.8
0.6
V
mΩ
A
mV/C
mV
mV
mA
mA
RS7812 SERIES ELECTRICAL CHARACTERISTICS
VIN=19V, IOUT=500mA, CIN=0.33uF, COUT=0.1uF, 0CTJ125C (unless otherwise specified)
RS7812E
Parameter
Symbol
Conditions
Min.
Typ.
Max.
11.64
12
12.36
TJ=25C, IOUT=500mA
Output Voltage
VO
5mAIOUT1A
11.64
12
12.36
14VVIN30V, POUT15W
10
120
TJ=25C, 14.5VVIN30V
Line Regulation
VO
3
60
TJ=25C, 16VVIN22V
12
100
TJ=25C, 5mAIOUT1A
Load Regulation
VO
4
60
TJ=25C, 250mAIOUT750mA
Quiescent Current
IB
3.9
8
IOUT=5mA, Tj=25C
IOUT=500mA, 14.5VVIN30V,
1.3
Quiescent Current
TJ=25oC
IB
Change
0.5
5mAIOUT1A, VIN=19V, TJ=25oC
B=10Hz~100KHz, IOUT=50mA,
90
Output Noise Voltage
eN
TJ=25C
19VVIN25V, f=120Hz, IOUT=50mA,
50
66
Ripple Rejection
RR
TJ=25oC
Dropout Voltage
VD
2
2.5
TJ=25C, IOUT=1A
Output Resistance
RO
f=1KHz
18
Short Circuit Current
ISC
2.3
2.8
TJ=25C
Output Voltage Drift
1.6
VO/T 0oCTJ125oC
V1.0
4
Units
V
mV
mV
mA
mA
uV/VO
dB
V
mΩ
A
mV/C
April 2013
RS7805/RS7812
CHARACTERISTICS CURVE
Ripple Rejection
Current Cut-off Grid Voltage
70
Vout
50
Output Voltage (V)
Ripple Rejection (dB)..
60
40
30
20
Vin=Vout(ic)+5V
o
Tj=25 C
Vin=(4.5+Vout(ic))VDC+3.5Vrms
Iout=50mA
Tj=25oC
10
0
10
100
1000
10000
100000
0
1000000
0.5
1
Frequency (Hz)
Worst Case Power Dissipation
2
2.5
3
Output Voltage as a Function of Junction
Temperature
2500
Vin=Vout(ic)+5V
Iout=5mA
Output Voltage (V)
2000
Output Current (mA)
1.5
Output Current (A)
1500
1000
With 72oC/W Heat Sink
Heat Sink Size: 50*50*2 mm
500
Free Air
0
0
5
10
15
20
25
30
35
0
50
Load Transient Response
o
150
200
Voltage Range
2.5
1.0
2
0.5
0
Vout
Voutput (V)
1.5
Load Current (A)
3
Output Voltage Deviion (V)..
100
Junction Temperature ( C)
Differential (V) Vinput-Voutput Voltage(V)
1
0.5
0
Vin=Vout(ic)+5V
Tj=25oC
-0.5
Iout=50mA
-1
0
V1.0
5
10
15
20
25
30
Time (us)
35
40
45
50
5
0
5
10
15
20
Vinput-Voutput (V)
25
30
35
April 2013
RS7805/RS7812
PACKAGE INFORMATION
TO-220-3
Notes:
1. Refer to JEDEC TO-220 AB.
2. All dimensions are in millimeter.
V1.0
6
April 2013
RS7805/RS7812
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian Dist., New Taipei City 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
V1.0
7
April 2013