L4979D
L4979MD
Low drop voltage regulator
Datasheet production data
Features
■
Operating DC supply voltage range 5.6 V to
31 V
■
Low quiescent current (6 µA typ. @ 25 °C with
enable low)
■
High precision output voltage (2%)
■
Low dropout voltage less than 0.5 V
■
Reset circuit sensing the output voltage down
to 1 V
■
Programmable reset pulse delay with external
capacitor
■
Watchdog
■
Programmable watchdog timer with external
capacitor
■
Thermal shutdown and short circuit protection
■
Automotive temperature range (Tj = -40 °C to
150 °C)
■
Enable input for enabling/disabling the voltage
regulator output
'!0'#&4
'!0'#&4
SO-20
SO-8
Description
L4979D and L4979MD are low dropout linear
regulators with microprocessor control functions
such as low voltage reset, watchdog, on/off
control. Typical quiescent current is 100 µA in
very low output current mode and enabled
regulator. The devices drop to 6 µA with not
enabled regulators.
On chip trimming results in high output voltage
accuracy (2%). Accuracy is kept over wide
temperature range, line and load variation.
The maximum input voltage is 40 V. The max
output current is internally limited. Internal
temperature protection disables the voltage
regulator output.
Table 1.
Device summary
Order codes
Package
September 2013
This is information on a product in full production.
Tube
Tape and reel
SO-8
L4979D
L4979D013TR
SO-20
L4979MD
L4979MD013TR
Doc ID 10262 Rev 9
1/22
www.st.com
1
Contents
L4979D, L4979MD
Contents
1
Block diagram and pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
4
5
6
2/22
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1
Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3
Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package and PCB thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
SO-8 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2
SO-20 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1
ECOPACK®
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2
SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3
SO-20 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Doc ID 10262 Rev 9
L4979D, L4979MD
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Enable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reset time diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SO-8 thermal parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SO-20 thermal parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SO-8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SO-20 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Doc ID 10262 Rev 9
3/22
List of figures
L4979D, L4979MD
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
4/22
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Behavior of output current versus regulated voltage Vo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Watchdog time diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SO-8 PC board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Rthj-amb vs PCB copper area in open box free air condition . . . . . . . . . . . . . . . . . . . . . . . 12
SO-8 thermal impedance junction ambient single pulse . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Thermal fitting model of Vreg in SO-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SO-20 PC board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Rthj-amb vs PCB copper area in open box free air condition . . . . . . . . . . . . . . . . . . . . . . . 15
SO-20 thermal impedance junction ambient single pulse . . . . . . . . . . . . . . . . . . . . . . . . . 15
Thermal fitting model of Vreg in SO-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SO-8 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SO-20 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Doc ID 10262 Rev 9
L4979D, L4979MD
1
Block diagram and pin descriptions
Block diagram and pin descriptions
Figure 1.
Block diagram
6I
6 M!
6O
6S
#O
6CW
#TW
GND
WATCHDOG
7I
%N
6OLTAGE REFERENCE
2ES
6CR
RESET
#TR
'!0'#&4
Table 2.
Pin function
SO8
pin number
SO20
pin number
Pin name
Function
1
1
En
Enable input If high, regulator, watchdog and reset are
operating. If low, regulator, watchdog and reset are shut
down.
2
4
gnd
Ground reference
5,6,15,16
gnd
Ground These pins are to be connected to a heat
spreader electrically grounded
3
7
Res
Reset output. It is pulled down when output voltage
drops below Vo_th or frequency at Wi is too low.
4
10
Vcr
Reset timing adjust A capacitor between Vcr pin and
gnd sets the reset delay time (trd)
5
11
Vcw
Watchdog timer adjust A capacitor between Vcw pin and
gnd sets the time response of the watchdog monitor.
6
14
Wi
Watchdog input. If the frequency at this input pin is too
low, the Reset output is activated.
7
17
Vo
Voltage regulator output Output capacitor >100 nF is
needed for regulator stability
Doc ID 10262 Rev 9
5/22
Block diagram and pin descriptions
Table 2.
L4979D, L4979MD
Pin function (continued)
SO8
pin number
SO20
pin number
Pin name
Function
8
20
Vs
Supply voltage Supply capacitor (e.g. 200 nF) is needed
for regulator stability.
2, 3, 8, 9,
12, 13, 18,
19
N. C.
Figure 2.
Not connected
Pins connection (top view)
%.
63
'.$
6/
2%3
7)
6#2
6#7
3/
'!0'#&4
%.
63
.#
.#
.#
.#
'.$
6/
'.$
'.$
'.$
'.$
2%3
7)
.#
.#
.#
.#
6#2
7#7
3/
'!0'#&4
6/22
Doc ID 10262 Rev 9
L4979D, L4979MD
Electrical specifications
2
Electrical specifications
2.1
Absolute maximum ratings
Stressing the device above the ratings listed in Table 3 may cause permanent damage to
the device. These are stress ratings only and operation of the device at these or any other
conditions above those indicated in the operating sections of this specification is not implied.
Exposure to the conditions reported in this section for extended periods may affect device
reliability. Refer also to the STMicroelectronics SURE program and other relevant quality
documents.
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
-0.3 to 40
V
Vvsdc
DC supply voltage
Ivsdc
Input current
Vvo
DC output voltage
Ivo
DC output current
Vwi
Watchdog input voltage
-0.3 to Vvo +0.3
V
Vod
Open drain output voltage (RES)
-0.3 to Vvo +0.3
V
Iod
Open drain output current (RES)
Vcr
Reset delay voltage
-0.3 to Vvo +0.3
V
Vcw
Watchdog delay voltage
-0.3 to Vvo +0.3
V
Ven
Enable input voltage
-0.3 to 40
V
Tj
Junction temperature
-40 to 150
°C
±2
kV
VESD
Internally limited
-0.3 to 6 (1)
V
Internally limited
Internally limited
ESD voltage level (HBM-MIL STD 883C)
1. Using the typical application schematic with Cout= 10 µF and Iout=0 A, when the regulator is switched-on,
an overshoot exceeding 6 V could occur.This behavior does not impact the reliability of the regulator.
Table 4.
Symbol
Rth j-amb
Thermal data
Parameter
Thermal resistance junction to ambient
Doc ID 10262 Rev 9
SO8
SO16+2+2
Unit
130 to 180
50 to 80
°C/W
7/22
Electrical specifications
2.2
L4979D, L4979MD
Electrical characteristics
Vs = 5.6 V to 31 V; Tj = -40 °C to 150 °C, unless otherwise specified.
Table 5.
General
Pin
Symbol
Vs, Vo
Iq
Quiescent current
Vs, Vo
Iq
Vs, Vo
Table 6.
Parameter
Test condition
Min.
Typ.
Max.
Unit
Vs = 13.5 V, Io = 150 mA,
enable high all
I/O currents = 0
1.5
3
mA
Quiescent current
Vs = 13.5 V, Io = 0 mA,
enable high all
I/O currents = 0
100
200
µA
Iq
Quiescent current
Vs = 13.5 V, Io = 0 mA,
enable low all
I/O currents = 0
6
20
µA
Tw
Thermal protection
temperature
190
°C
Tw_hy
Thermal protection
temperature
hysteresis
150
10
°C
Voltage regulator
Pin
Symbol
Parameter
Vo
Vo_ref
Output voltage
Vo
Ishort
Vo
Ilim
Vs, Vo
Test condition
Min.
Typ.
Max.
Unit
Vs = 5.6 to 31 V;
Io = 1 to 150 mA
4.90
5.00
5.10
V
Output short circuit
current(1)
Vs = 13.5 V
150
280
400
mA
Output current
limitation(1)
Vs = 13.5 V
150
320
500
mA
Vline
Line regulation voltage
Vs = 5.6 to 31 V
Io = 1 to 150 mA
25
mV
Vo
Vload
Load regulation voltage
Io = 1 to 150 mA
25
mV
Vs, Vo
Vdp
Drop voltage
Io = 150 mA
400
mV
Vs, Vo
SVR
Ripple rejection(2)
fr = 100 Hz
200
55
dB
1. See Figure 3: Behavior of output current versus regulated voltage Vo.
2. Guaranteed by design.
Table 7.
8/22
Reset
Pin
Symbol
Parameter
Test condition
Res
Vres_l
Reset output low
voltage
Rext = 5 k to Vo;
Vo > 1 V
Res
Ires_h
Reset output high
leakage current
Vres = 5 V
Doc ID 10262 Rev 9
Min.
Typ.
Max.
Unit
0.4
V
1
µA
L4979D, L4979MD
Table 7.
Electrical specifications
Reset (continued)
Pin
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Res
R_p_u
Internal pull-up
resistance
With respect to Vo
12
25
50
k
Res
Vo_th
Reset threshold voltage
Vs = 5.6 to 31 V
Io = 1 to 150 mA
8%
10%
6%
below below below
Vo_ref Vo_ref Vo_ref
Vcr
Vrhth
Reset timing high
threshold
Vs = 13.5 V
44%
Vo_ref
47%
Vo_ref
50%
Vo_ref
Vcr
Vrlth
Reset timing low
threshold
Vs = 13.5 V
10%
Vo_ref
13%
Vo_ref
16%
Vo_ref
Vcr
Icr
Charge current
Vs = 13.5 V
8
17
30
µA
Vcr
Idr
Discharge current
Vs = 13.5 V
8
17
30
µA
Res
trr_2
Reset delay time(1)
Vo = Vo_th - 100 mV
100
250
700
µs
Res
trd
Reset pulse delay
Vs = 13.5 V; Ctr = 1 nF
65
150
ms
1. When Vo becomes lower than 4 V, the reset reaction time decreases down to 2 µs assuring a faster reset
condition in this particular case.
Table 8.
Watchdog
Pin
Symbol
Wi
Vih
Input high voltage
Vs = 13.5 V
Wi
Vil
Input low voltage
Vs = 13.5 V
Wi
Vih
Input hysteresis
Vs = 13.5 V
300
Wi
Ii
Pull down current
Vs = 13.5 V
10
20
µA
Vcw
Vwhth
High threshold
Vs = 13.5 V
2.20
2.35
2.50
V
Vcw
Vwlth
Low threshold
Vs = 13.5 V
0.50
0.65
0.80
V
Vcw
Icwc
Charge current
Vs = 13.5 V; Vcw = 0.1 V
4
7.5
14
µA
Vcw
Icwd
Discharge current
Vs = 13.5 V; Vcw = 2.5 V
1.0
2.4
4.5
µA
Vcw
Twop
Watchdog period
Vs = 13.5 V;
Ctw = 47 nF
25
50
90
ms
Res
twol
Watchdog output low
time
Vs = 13.5 V;
Ctw = 47 nF
6
10
22
ms
Min.
Typ.
Max.
Unit
1
V
Table 9.
Parameter
Test condition
Min.
Typ.
Max.
3.5
Unit
V
1.5
V
mV
Enable
Pin
Symbol
Parameter
En
Ven_l
Enable input low voltage
En
Ven_h
Enable input high
voltage
En
Ven_hy
Enable input hysteresis
En
I_leak
Pull down current
Test condition
3
En = 5 V
Doc ID 10262 Rev 9
V
700
1000
1100
mV
2
10
20
µA
9/22
Application information
L4979D, L4979MD
3
Application information
3.1
Voltage regulator
The voltage regulator uses a p-channel MOS transistor as a regulating element. With this
structure a low dropout voltage at current up to 150 mA is achieved. The output voltage is
regulated up to transient input supply voltage of 40 V. No functional interruption due to overvoltage pulses is generated. The high precision of the output voltage is obtained with a pretrimmed reference voltage. A short circuit protection to GND is provided.
Figure 3.
Behavior of output current versus regulated voltage Vo
6O
6O?REF
)SHORT )LIM
)OUT
("1($'5
3.2
Reset
The reset circuit monitors the output voltage Vo. If the output voltage drops below Vo_th then
Res becomes low with a delay time trr. Real trr value changes as a non-linear function of
delta (Vo-th - Vo). The reset low signal is guaranteed for an output voltage Vo greater than
1 V.
When the output voltage becomes higher than Vo_th then Res goes high with a delay trd. This
delay is obtained by 512 periods of an oscillator (see fig. 5). The oscillator period is given by:
V rhth – V rlth C tr V rhth – V rlth C tr
T OSC = ----------------------------------------------------- + -----------------------------------------------------I cr
I dr
and reset pulse delay trd is given by:
t rd = 512 T OSC
10/22
Doc ID 10262 Rev 9
L4979D, L4979MD
Table 10.
Application information
Reset time diagram
7I
6O
6 OUT?TH
TRR
4 OSC
TRR
6 CR
6 RHTH
6 RLTH
TRD 4 OSC
2ES
'!0'#&4
3.3
Watchdog
The watchdog input Wi monitors a connected microcontroller. If pulses are missing, the
reset output Res is set to low. The pulse sequence time can be set within a wide range
through the external capacitor Ctw. The watchdog circuit discharges the capacitor Ctw with
the constant current Icwd. If the lower threshold Vwlth is reached, a watchdog reset is
generated. To prevent this reset, the microcontroller must generate a positive edge during
the discharge of the capacitor before the voltage has reached the threshold Vwlth. In order to
calculate the minimum time Tdis during which the microcontroller must generate the positive
edge, the following equation can be used:
V whth – V wlth C tw = I cwd T dis
Each Wi positive edge switches the current source from discharging to charging; the same
happens when the lower Vwlth threshold is reached. When the voltage reaches the upper
threshold Vwhth the current switches from charging to discharging. The result is a saw tooth
voltage at the watchdog timer capacitor Ctw.
Figure 4.
Watchdog time diagram
7I
4WO P
6WHTH
6CW
6WLTH
TWOL
4DIS
2ES
'!0'#&4
Doc ID 10262 Rev 9
11/22
Package and PCB thermal data
L4979D, L4979MD
4
Package and PCB thermal data
4.1
SO-8 thermal data
Figure 5.
SO-8 PC board
*$3*&)7
1. Layout condition of Rth and Zth measurements (PCB: FR4 area = 58 mm x 58 mm, PCB thickness = 2 mm,
Cu thickness = 35 mm, Copper areas: from minimum pad lay-out to 2cm2).
Figure 6.
Rthj-amb vs PCB copper area in open box free air condition
24(J?AMB VS #U HEATSINK AREA
24(J?AMB #7
24(JAMB
0#" #U HEATSINK AREA CM>
'!0'#&4
12/22
Doc ID 10262 Rev 9
L4979D, L4979MD
Package and PCB thermal data
Figure 7.
SO-8 thermal impedance junction ambient single pulse
:4( #7
#U CM
#UFOOT PRINT
4IME S
'!0'#&4
Equation 1: pulse calculation formula
Z
TH
= R
TH
+Z
THtp
1 –
where = tP/T
Figure 8.
Thermal fitting model of Vreg in SO-8
*$3*&)7
Doc ID 10262 Rev 9
13/22
Package and PCB thermal data
Table 11.
4.2
L4979D, L4979MD
SO-8 thermal parameter
Area (cm2)
Footprint
R1 (°C/W)
4
R2 (°C/W)
2
R3 (°C/W)
2
R4 (°C/W)
41
R5 (°C/W)
40
R6 (°C/W)
58
C1 (W.s/°C)
0.0003
C2 (W.s/°C)
0.0025
C3 (W.s/°C)
0.03
C4 (W.s/°C)
0.04
C5 (W.s/°C)
0.1
C6 (W.s/°C)
1.05
2
40
2
SO-20 thermal data
Figure 9.
SO-20 PC board
*$3*&)7
1. Layout condition of Rth and Zth measurements (PCB: FR4 area = 58 mm x 58 mm, PCB thickness = 2 mm,
Cu thickness = 35 mm, Copper areas: from minimum pad lay-out to 6cm2).
14/22
Doc ID 10262 Rev 9
L4979D, L4979MD
Package and PCB thermal data
Figure 10. Rthj-amb vs PCB copper area in open box free air condition
57+MBDPEYV&XKHDWVLQNDUHD
57+MBDPE &:
57+MDPE
3&%&XKHDWVLQNDUHD FPA
("1($'5
Figure 11. SO-20 thermal impedance junction ambient single pulse
=7+ &:
&X FP
&X IRRWSULQW
7LPH V
("1($'5
Doc ID 10262 Rev 9
15/22
Package and PCB thermal data
L4979D, L4979MD
Equation 2: pulse calculation formula
Z
TH
= R
TH
+Z
THtp
1 –
where = tP/T
Figure 12. Thermal fitting model of Vreg in SO-20
*$3*&)7
Table 12.
16/22
SO-20 thermal parameter
Area (cm2)
Footprint
R1 (°C/W)
4
R2 (°C/W)
2
R3 (°C/W)
2.2
R4 (°C/W)
10
R5 (°C/W)
15
R6 (°C/W)
35
C1 (W.s/°C)
0.0003
C2 (W.s/°C)
0.0025
C3 (W.s/°C)
0.015
C4 (W.s/°C)
0.15
C5 (W.s/°C)
1.5
C6 (W.s/°C)
4
Doc ID 10262 Rev 9
2
18
7
L4979D, L4979MD
Package information
5
Package information
5.1
ECOPACK®
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
5.2
SO-8 package information
Figure 13. SO-8 package dimensions
'!0'#&4
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Package information
Table 13.
L4979D, L4979MD
SO-8 mechanical data
mm
inch
Symbol
Min.
Typ.
Max.
Min.
Typ.
Max.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.004
0.010
A2
1.10
1.65
0.043
0.065
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D(1)
4.80
5.00
0.189
0.197
E
3.80
4.00
0.15
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
0°
8°
0°
8°
ddd
0.10
0.004
1. Dimensions D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs
shall not exceed 0.15 mm (0.006 inch) in total (both side).
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5.3
Package information
SO-20 package information
Figure 14. SO-20 package dimensions
("1($'5
Table 14.
SO-20 mechanical data
mm
inch
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
2.35
2.65
0.093
0.104
A1
0.10
0.30
0.004
0.012
B
0.33
0.51
0.013
0.200
C
0.23
0.32
0.009
0.013
D(1)
12.60
13.00
0.496
0.512
E
7.40
7.60
0.291
0.299
e
1.27
0.050
H
10.0
10.65
0.394
0.419
h
0.25
0.75
0.010
0.030
L
0.40
1.27
0.016
0.050
k
ddd
0° (min.), 8° (max.)
0.10
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0.004
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Package information
L4979D, L4979MD
1. “D” dimension does not include mold flash, protusions or gate burrs. Mold flash, protrusions or gate burrs
shall not exceed 0.15 mm per side.
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6
Revision history
Revision history
Table 15.
Document revision history
Date
Revision
Changes
01-Jun-2004
3
Changed the values of the parameter “Reset timing high/low threshold.
01-Jul-2004
4
Pin Connection SO-20 changed. Changed some textes in the Features
and table 2. Changed some values in the tables 3, 4 and 5. Changed
some textes in the sections 2, 3 and 4.
01-Oct-2004
5
Changed from Product Preview to final datasheet.
01-Feb-2006
6
Modified the orderable part numbers for Tape & Reel.
04-Apr-2011
7
Changed document template.
Added Chapter 4: Package and PCB thermal data
27-Mar-2012
8
Update Table 3: Absolute maximum ratings
19-Sep-2013
9
Updated Disclaimer.
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L4979D, L4979MD
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