L79
Negative voltage regulators
Datasheet - production data
TAB
Description
3
1
D
2
PAK
1
2
3
TAB
TO-220FP
The L79 series of three-terminal negative
regulators is available in TO-220, TO-220FP and
D²PAK packages and several fixed output
voltages, making it useful in a wide range of
applications.
These regulators can provide local on-card
regulation, eliminating the distribution problems
associated with single point regulation;
furthermore, having the same voltage option as
the L78 positive standard series, they are
particularly suited for split power supplies. If
adequate heat sinking is provided, they can
deliver over 1.5 A output current.
Although designed primarily as fixed voltage
regulators, these devices can be used with
external components to obtain adjustable
voltages and currents.
1
TO-220
2
3
Features
R
EV
Output current up to 1.5 A
Output voltages: -5, -8, -12, and -5 V
Thermal overload protection
Short-circuit protection
Output transition SOA protection
Output tolerance 2% (AC version) or 4% (C
version) at 25 °C
Order codes
D²PAK
L7905ACD2T-TR
L7905CD2T-TR
L7905CP
TO-220FP
Output voltages
TO-220
(single gauge)
L7905ACV
L7905CV
L7908CV
L7912ACV
L7912CV
L7915ACV
L7915CV
TO-220
(dual gauge)
L7905ACV-DG
L7905CV-DG
L7908CV-DG
L7912ACV-DG
L7912CV-DG
L7915ACV-DG
L7915CV-DG
23
Table 1: Device summary
dr
L7912CD2T-TR
af
ta
L7912CP
L7915CP
-5 V
-5 V
-8 V
-12 V
-12 V
-15 V
-15 V
September 2017
DocID2149 Rev 23
1/27
www.st.com
This is information on a product in full production.
Contents
L79
Contents
1
2
3
4
5
6
7
Diagram ............................................................................................ 5
Pin configuration ............................................................................. 6
Maximum ratings ............................................................................. 7
Test circuit ....................................................................................... 8
Electrical characteristics ................................................................ 9
Application information ................................................................ 14
Package information ..................................................................... 16
7.1
7.2
7.3
7.4
7.5
TO-220 (single gauge) package information ................................... 16
TO-220 (dual gauge) package information ...................................... 18
TO-220FP package information ...................................................... 20
D²PAK (TO-263) type A package information ................................. 22
D²PAK type A packing information .................................................. 24
8
Revision history ............................................................................ 26
2/27
R
DocID2149 Rev 23
EV
23
dr
af
ta
L79
List of tables
List of tables
Table 1: Device summary ........................................................................................................................... 1
Table 2: Absolute maximum ratings ........................................................................................................... 7
Table 3: Thermal data ................................................................................................................................. 7
Table 4: Electrical characteristics of L7905AC ........................................................................................... 9
Table 5: Electrical characteristics of L7905C ............................................................................................. 9
Table 6: Electrical characteristics of L7908C ........................................................................................... 10
Table 7: Electrical characteristics of L7912AC ......................................................................................... 11
Table 8: Electrical characteristics of L7912C ........................................................................................... 11
Table 9: Electrical characteristics of L7915AC ......................................................................................... 12
Table 10: Electrical characteristics of L7915C ......................................................................................... 13
Table 11: TO-220 (single gauge) package mechanical data .................................................................... 17
Table 12: TO-220 type A package mechanical data ................................................................................ 19
Table 13: TO-220FP package mechanical data ....................................................................................... 21
Table 14: D²PAK (TO-263) type A package mechanical data .................................................................. 22
Table 15: D²PAK type A tape and reel mechanical data .......................................................................... 25
Table 16: Document revision history ........................................................................................................ 26
R
DocID2149 Rev 23
EV
23
dr
af
ta
3/27
List of figures
L79
List of figures
Figure 1: Schematic diagram ...................................................................................................................... 5
Figure 2: Pin connections (top view) ........................................................................................................... 6
Figure 3: Test circuit ................................................................................................................................... 8
Figure 4: Fixed output regulator ................................................................................................................ 14
Figure 5: Split power supply (±15 V - 1 A) ................................................................................................ 14
Figure 6: Circuit for increasing output voltage .......................................................................................... 14
Figure 7: High current negative regulator (-5 V / 4 A with 5 A current limiting) ........................................ 15
Figure 8: TO-220 (single gauge) package outline .................................................................................... 16
Figure 9: TO-220 type A package outline ................................................................................................. 18
Figure 10: TO-220FP package outline...................................................................................................... 20
Figure 11: D²PAK (TO-263) type A package outline ................................................................................ 22
Figure 12: D²PAK (TO-263) type A recommended footprint (dimensions are in mm) .............................. 23
Figure 13: D²PAK type A tape outline ....................................................................................................... 24
Figure 14: D²PAK type A reel outline ........................................................................................................ 25
4/27
R
DocID2149 Rev 23
EV
23
dr
af
ta
L79
Diagram
1
Diagram
Figure 1: Schematic diagram
R7
Q9
R18
Q8
R6
D1
D2
R5
Q11
Q7
Q2
Q16
Q3
R10
Q19
Q20
Q21
D3
OUT
Q17
R17
Q10
Q18
R19
Q1
Q4
Q5
Q6
Q12
af
ta
R12
R9
R13
Q14
Q15
R15
R11
R20
R14
R21
Q22
R16
IN
R
DocID2149 Rev 23
EV
23
dr
Q13
R1
R2
R3
R4
R8
5/27
京公网安备 11010802033920号
EEWORLD
