L4995
5V, 500mA low drop voltage regulator
Datasheet − production data
Features
Max DC supply voltage
VS
40V
Max output voltage tolerance
ΔV0
+/-2%
Max dropout voltage
Vdp
500mV
Output current
I0
500mA
Quiescent current
Iqn
3µA(1)
1. Typical value with regulator disabled
■
Operating DC supply voltage range 5.6V to
31V
■
Low dropout voltage
■
Low quiescent current consumption
■
Reset circuit sensing of output voltage down to
1V
■
Programmable reset pulse delay with external
capacitor
■
Programmable watchdog(a) timer with external
capacitor
■
Thermal shutdown and short circuit protection
■
Wide temperature range (Tj = -40 °C to 150 °C)
■
Enable(a) input for enabling/disabling the
voltage regulator
PowerSSO-24
Description
L4995 is a family of monolithic integrated 5 V
voltage regulators with a low drop voltage at
currents of up to 500 mA, available in both 12 and
24 pin packages.
The output voltage regulating element consists of
a p-channel MOS and regulation is performed
regardless of input voltage transients of up to 40V.
The high precision of the output voltage is
obtained using a pre-trimmed reference voltage.
The L4995 family is protected against short circuit
and overtemperature protection switches off the
devices in the case of extremely high power
dissipation. The L4995 integrates the watchdog,
enable and externally programmable reset
circuits. The L4995A features the externally
programmable reset and enable. Finally the
L4995R features the externally programmable
reset.
The combination of such features makes this
device particularly flexible and suitable to supply
microprocessor systems in automotive
applications.
a. Watchdog and Enable facilities are available
according to Device summary table.
Table 1.
PowerSSO-12
Device summary
Order codes
Package
Tube
Tape and reel
PowerSSO-12 (exposed pad)
L4995J - L4995AJ - L4995RJ
L4995JTR - L4995AJTR - L4995RJTR
PowerSSO-24 (exposed pad)
L4995K - L4995AK - L4995RK
L4995KTR - L4995AKTR - L4995RKTR
P/N
Watchdog
Reset
Enable
L4995J - L4995K
X
X
X
L4995AJ - L4995AK
-
X
X
L4995RJ - L4995RK
-
X
-
October 2012
This is information on a product in full production.
Doc ID 13103 Rev 13
1/35
www.st.com
1
Contents
L4995
Contents
1
Block diagrams and pins descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.5
Test circuit and waveforms plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5.1
3
4
5
6
2/35
Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1
Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3
Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Package and PCB thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1
PowerSSO-12 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2
PowerSSO-24 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1
ECOPACK® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2
PowerSSO-24 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3
PowerSSO-12 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.4
PowerSSO-24 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Doc ID 13103 Rev 13
L4995
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.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pins descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Enable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PowerSSO-12 thermal parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PowerSSO-24 thermal parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PowerSSO-12 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
PowerSSO-24 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Doc ID 13103 Rev 13
3/35
List of figures
L4995
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.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
Figure 42.
Figure 43.
Figure 44.
4/35
Block diagram of L4995 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Block diagram of L4995A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Block diagram of L4995R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pins configurations (L4995) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output voltage vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output voltage vs VS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Drop voltage vs output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current consumption vs output current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current consumption vs input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current limitation vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current limitation vs input voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Short circuit current vs input voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output voltage vs enable voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VEn_high vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VEN_LOW vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VRhth vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VRlth vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Vwhth vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Vwlth vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Icr and Icwc vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Idr and Icwd vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Twop vs Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PSRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Load regulation test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maximum load variation response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
L4995 application schematic(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Stability region(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Behavior of output current versus regulated voltage Vo . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Watchdog timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PowerSSO-12 PC board(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Rthj-amb vs PCB copper area in open box free air condition . . . . . . . . . . . . . . . . . . . . . . 20
PowerSSO-12 thermal impedance junction ambient single pulse . . . . . . . . . . . . . . . . . . . 21
Thermal fitting model of Vreg in PowerSSO-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PowerSSO-24 PC board(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Rthj-amb vs PCB copper area in open box free air condition . . . . . . . . . . . . . . . . . . . . . . 23
PowerSSO-24 thermal impedance junction ambient single pulse . . . . . . . . . . . . . . . . . . . 24
Thermal fitting model of Vreg in PowerSSO-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
PowerSSO-12 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PowerSSO-24 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
PowerSSO-12 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
PowerSSO-12 tape and reel shipment (suffix “TR”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
PowerSS0-24 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
PowerSSO-24 tape and reel shipment (suffix “TR”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Doc ID 13103 Rev 13
L4995
1
Block diagrams and pins descriptions
Block diagrams and pins descriptions
Figure 1.
Block diagram of L4995
9R
9V
)S
)O
9RV
6
6WDUWXS
3
)
9
%N
9ROWDJH
5HIHUHQFH
(Q
6%N
)CW
6O
P9 B
9FZ
6CW
5HV
:L
ZDWFKGRJ
6WI
6CR
9FU
/RZ9ROWDJH
5HVHW
'.$
6
2ES
("1(.4
Figure 2.
Block diagram of L4995A
)S
9R
9V
)O
9RV
6
6WDUWXS
3
)
9
%N
9ROWDJH
5HIHUHQFH
(Q
6%N
6O
P9 B
5HV
6CR
9FU
'.$
6
/RZ9ROWDJH
5HVHW
2ES
'!0'-3
Doc ID 13103 Rev 13
5/35
Block diagrams and pins descriptions
Figure 3.
L4995
Block diagram of L4995R
)S
9R
9V
)O
9RV
6
6WDUWXS
3
9
9ROWDJH
5HIHUHQFH
6O
P9 B
6%N
5HV
6CR
9FU
'.$
/RZ9ROWDJH
5HVHW
2ES
'!0'-3
Table 2.
Pin
name
Pins descriptions
PowerSSO-12 PowerSSO-24
pin #
Function
pin #
Enable input (L4995 and L4996A only, otherwise not
connected).
If high regulator, watchdog and reset are operating. If
low regulator, watchdog and reset are shutdown.
Connect to Vs if not used.
En
1
13, 14, 15
NC
2, 4, 8
3, 5, 6, 9, 11
GND
3
16, 17, 18
Ground reference.
-
TAB
TAB, 1, 12
Substrate of the chip: connect the pins or the TAB to
GND.
Res
5
19, 20, 21
Reset output.
It is pulled down when output voltage goes below Vo_th
or frequency at Wi is too low. Leave floating if not used.
Vcr
6
22, 23, 24
Reset timing adjust.
A capacitor between Vcr pin and GND. Sets the reset
delay time (trd). Leave floating if Reset is not used.
2
Watchdog timer adjust (L4995 only, otherwise not
connected).
A capacitor between Vcw pin and GND. Sets the time
response of the watchdog monitor.
Vcw
6/35
6
7
Not connected.
Doc ID 13103 Rev 13
L4995
Block diagrams and pins descriptions
Table 2.
Pin
Pins descriptions (continued)
PowerSSO-12 PowerSSO-24
Function
name
pin #
pin #
Wi
9
4
Watchdog input (L4995 only, otherwise not connected).
If the frequency at this input pin is too low, the Reset
output is activated.
Vos
10
7
Regulator voltage output sensing.
Vo
11
8
5 voltage regulator output.
Block to ground with a capacitor >100nF (needed for
regulator stability).
VS
12
10
Supply voltage.
Block to ground directly at VS pin with a ceramic
capacitor (e.g. 200nF).
Figure 4.
Pins configurations (L4995)
SUBSTRATE
4!"SUBSTRATE
SUBSTRATE
4!"SUBSTRATE
'!0'-3
Doc ID 13103 Rev 13
7/35
Electrical specifications
L4995
2
Electrical specifications
2.1
Absolute maximum ratings
Stressing the device above the rating listed in the “Absolute maximum ratings” table 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 Absolute Maximum Rating conditions 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(1)
DC output voltage
- 0.3 to 6
IVo
DC output current
Internally limited
VWi
Watchdog input voltage
-0.3 to VVo + 0.3
V
Vod
Res output voltage
-0.3 to VVo + 0.3
V
Iod
Res output current
Internally limited
Vcr
Vcr voltage
- 0.3 to VVo + 0.3
V
Vcw
Watchdog delay voltage
- 0.3 to VVo + 0.3
V
VEn
Enable input
- 0.3 to VVsdc +0.3
V
- 40 to 150
C
Tj
Internally limited
Junction temperature
V
VESD
ESD voltage level (HBM-MIL STD 883C)
±2
kV
VESD
ESD voltage level (CDM AEC-Q100-011)
750
V
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.
8/35
Doc ID 13103 Rev 13
L4995
2.2
Electrical specifications
Thermal data
For details, please refer to Section 4.1: PowerSSO-12 thermal data and Section 4.2:
PowerSSO-24 thermal data.
Thermal data(1)
mm
Table 4.
Symbol
Parameter
Value
Unit
Rthj-case
Thermal resistance Junction to Case:
PowerSSO-12
PowerSSO-24
5
4
°K/W
°K/W
Rthj-amb
Thermal resistance Junction to Ambient:
PowerSSO-12
PowerSSO-24
52
38
°K/W
°K/W
1. The values quoted are for PCB 77mm x 86mm x 1.6mm, FR4, double layer; Copper thickness 0.070mm
Copper area 3cm2 Thermal Vias, Thermal vias separation 1.2 mm, Thermal via diameter 0.3 mm +/- 0.08
mm, Cu thickness on vias 0.025 mm.
2.3
Electrical characteristics
Values specified in this section are for Vs = 5.6V to 31V, Tj = -40 °C to +150 °C unless
otherwise stated.
Table 5.
General
Pin
Symbol
Parameter
Vo
Vo_ref
Output voltage
Vo
Ishort
Vo
Test condition
Min.
Typ. Max.
VS = 5.6 to 31V
Io = 0 to 500mA
4.9
5.00
5.1
V
Short circuit current
VS = 13.5V (1)
550
800
1050
mA
Ilim(2)
Output current limitation
VS = 13.5V (1)
600
900
1250
mA
VS, Vo
Vline
Line regulation voltage
VS = 5.6 to 31V
Io = 0 to 500mA
25
mV
Vo
Vload
Load regulation voltage
Io = 0 to 500mA
25
mV
VS, Vo
Vdp(3)
Drop voltage
Io = 400mA
500
mV
VS, Vo
SVR
Ripple rejection
fr = 100 Hz (4)
VS, Vo
Iqs
Current consumption with
regulator disabled
VS = 13.5V,
En = low
3
10
µA
VS, Vo
Iqn_1
Current consumption
with regulator enabled
VS = 13.5V,
Io < 1mA,
90
160
µA
VS, Vo
Iqn_50
Current consumption
with regulator enabled
VS = 13.5V,
Io = 50mA,
290
400
µA
Doc ID 13103 Rev 13
270
55
Unit
dB
9/35
Electrical specifications
Table 5.
L4995
General (continued)
Pin
Symbol
VS, Vo
Iqn_150
Current consumption
with regulator enabled
VS = 13.5V,
Io = 150mA,
740
1000
µA
VS, Vo
Iqn_250
Current consumption
with regulator enabled
VS= 13.5V,
Io= 250mA,
1
1.4
mA
VS, Vo
Iqn_500
Current consumption
with regulator enabled
VS= 13.5V,
Io= 500mA,
2.1
2.7
mA
190
°C
Tw
Tw_hy
Parameter
Test condition
Thermal protection
temperature
Min.
Typ. Max.
150
Thermal protection
temperature hysteresis
10
Unit
°C
1. See Figure 28.
2. Measured output current when the output voltage has dropped 100mV from its nominal value obtained at
Vs=13.5V and Io= 250mA.
3. Vs-Vo measured when the output voltage has dropped 100mV from its nominal value obtained at Vs=13.5V
and Io= 250mA.
4. Guaranteed by design.
Table 6.
Reset
Pin
Symbol
Parameter
Res
Vres_l
Res
IRes_lkg
Res
RRes
Pull up internal resistance
(versus Vo)
Res
Vo_th
Vo out of regulation
threshold
Vcr
VRlth
Vcr
VRhth
Vcr
Reset output low voltage
Test condition
Min.
Typ. Max.
Rext = 5kΩ to Vo,
Vo > 1V
Reset output high leakage
VRes = 5V
current
Unit
0.4
V
1
µA
10
20
40
kΩ
VS = 5.6 to 31V
Io = 1 to 500mA
6%
8%
10%
below
Vo_ref
Reset delay circuit low
threshold
VS = 13.5V
10%
13%
16%
Vo_ref
Reset delay circuit high
threshold
VS =13.5V
44%
47%
50%
Vo_ref
Icr
Charge current
VS = 13.5V
8
15
30
µA
Vcr
Idr
Discharge current
VS = 13.5V
8
15
30
µA
Res
Trr
Reset reaction time(1)
Vo = Vo_th -100mV
100
250
700
µs
Res
Trd
Reset delay time
VS = 13.5V,
Ctr = 47nF
12
33
73
ms
1. When Vo becomes lower than 4V, the reset reaction time decreases down to 2µs assuring a faster reset
condition in this particular case.
10/35
Doc ID 13103 Rev 13
L4995
Electrical specifications
Table 7.
Watchdog
Pin
Symbol
Wi
Vih
Input high voltage
VS = 13.5V
Wi
Vil
Input low voltage
VS = 13.5V
Wi
Vih
Input hysteresis
VS = 13.5V
500
Wi
Iwi
Pull down current
VS = 13.5V
Vwi = 3.5V
6
10
µA
Vcw
Vwlth
Low threshold
VS = 13.5V
10%
13%
16%
Vo_ref
Vcw
Vwhth
High threshold
VS = 13.5V
44%
47%
50%
Vo_ref
Vcw
Icwc
Charge current
VS = 13.5V,
Vcw = 0.1V
5
10
20
µA
Vcw
Icwd
Discharge current
VS = 13.5V,
Vcw = 2.5V
1.25
2.5
5
µA
Vcw
Twop
Watchdog period
VS = 13.5V,
Ctw = 47nF
20
40
80
ms
Res
twol
Watchdog output low time
VS = 13.5V,
Ctw = 47nF
4
8
16
ms
Table 8.
Parameter
Test condition
Min.
Typ. Max.
3.5
Unit
V
1.5
V
mV
Enable
Pin
Symbol
Parameter
En
VEn_low
En input low voltage
En
VEn_high
En input high voltage
En
VEn_hyst
En input hysteresis
En
IEn
Pull down current
Test condition
Min.
Typ. Max.
1
3
Doc ID 13103 Rev 13
V
V
830
VS = 13.5V
Unit
10
mV
18
µA
11/35
Electrical specifications
L4995
2.4
Electrical characteristics curves
Figure 5.
Output voltage vs Tj
Figure 6.
Output voltage vs VS
6O?REF6
6O?REF6
6S6
) M!
) M!
4J #
'!0'-3
'!0'-3
Figure 7.
6S6
4J #
Drop voltage vs output current
6DP6
Figure 8.
Current consumption vs output
current
)QN!
6S6
4J #
%N(IGH
4J #
4J #
)OM!
)OM!
Figure 9.
'!0'-3
'!0'-3
Current consumption vs input
voltage
)QN!
Figure 10. Current limitation vs Tj
)LIMM!
)OM!
4J #
%N(IGH
6S6
)OM!
)OM!
)OM!
6S6
12/35
'!0'-3
Doc ID 13103 Rev 13
4J #
'!0'-3
L4995
Electrical specifications
Figure 11.
Current limitation vs input voltage
Figure 12. Short circuit current vs input
voltage
e
)LIMM!
)SHORTM!
4J #
4J #
4J #
4J #
6S6
'!0'-3
6S6
'!0'-3
Figure 13. Output voltage vs enable voltage
Figure 14. VEn_high vs Tj
6EN?HIGH6
6S6TO6
6O6
6EN6
4J #
'!0'-3
Figure 15. VEN_LOW vs Tj
'!0'-3
Figure 16. VRhth vs Tj
6RHTH6O?REF
6EN? LOW6
6S6TO6
6S6TO6
4J #
4J #
'!0'-3
Doc ID 13103 Rev 13
'!0'-3
13/35
Electrical specifications
L4995
Figure 17. VRlth vs Tj
Figure 18. Vwhth vs Tj
6RLTH6O?REF
6WHTH6O?REF
6S6TO6
6S6TO6
4J #
4J #
'!0'-3
Figure 19. Vwlth vs Tj
'!0'-3
Figure 20. Icr and Icwc vs Tj
6WLTH6O?REF
)CR)CWC!
6S6TO6
6CW6
6S6TO6
)CR
)CWC
'!0'-3
'!0'-3
Figure 21. Idr and Icwd vs Tj
Figure 22. Twop vs Tj
)DR)CWD!
4WOP MS
6S6TO6
6CW6
)DR
4J #
4J #
6S6TO6
#TWN&
)CWD
4J #
'!0'-3
14/35
Doc ID 13103 Rev 13
4J #
'!0'-3
L4995
Electrical specifications
Figure 23. PSRR
C0= 4.7 µF
PSRR [dB]
80,00
70,00
60,00
50,00
40,00
30,00
20,00
10,00
0,00
0,10
1,00
10,00
100,00
1000,00
FREQUENCY [KHz]
10000
00,00
GAPGMS00073
2.5
Test circuit and waveforms plot
2.5.1
Load regulation
Figure 24. Load regulation test circuit
'!0'-3
Doc ID 13103 Rev 13
15/35
Electrical specifications
L4995
Figure 25. Maximum load variation response
V0
I0
0,00E+00
[ 1 V / div]
[ 2 0 0 mA / div ]
5,00E-05
1,00E-04
1,50E-04
2,00E-04
Time [s]
16/35
Doc ID 13103 Rev 13
2,50E-04
3,00E-04
3,50E-04
4,00E-04
GAPGMS00081
L4995
Application information
Figure 26. L4995 application schematic(1)
6O
6S
6I
6O S
#O
#O
3TARTUP
6
%N
GND
6OLTAGE
2EFERENCE
M6
?
6CW
#TW
2ES
WATCHDOG
7I
,OW6OLTAGE
2ESET
6CR
#TR
'!0'-3
1. The input capacitor Cs > 200nF is necessary for the smoothing of line disturbances. The output capacitor
C01 > 100nF is necessary for the stability of the regulation loop. In order to dampen output voltage
oscillations during high load current surges, it is recommended an additional electrolytic capacitor C02 >
10µF to be placed at the output pin.
Figure 27. Stability region(1)
100
Unstable region
10
ESR (Ohm)
3
Application information
1
Stability region
ESR min
ESR max
0.1
0.01
Undefined region
0.001
0.5
5
10
15
20
25
30
35
40
45
50
Co (uF)
1. The curve which describes the minimum ESR is derived from characterization data on the regulator with
connected ceramic capacitors which feature low ESR values (at 100 kHz). Any capacitor with further lower
ESR than the given plot value must be evaluated in each and every case.
Doc ID 13103 Rev 13
17/35
Application information
3.1
L4995
Voltage regulator
Voltage regulator uses a p-channel transistor as a regulating element. With this structure,
very low dropout voltage at current up to 500mA is obtained. The output voltage is regulated
up to transient input supply voltage of 40V. No functional interruption due to over-voltage
pulses is generated. A short circuit protection to GND is provided.
The voltage regulator is active when En is high.
Figure 28. Behavior of output current versus regulated voltage Vo
Vo
Vo_ref
Ishort Ilim
3.2
Iout
Reset
The reset circuit supervises the output voltage Vo. The Vo_th reset threshold is defined with
the in-ternal reference voltage and a resistor output divider. If the output voltage becomes
lower than Vo_th then Res goes low with a reaction time trr. The reset low signal is
guaranteed for an output voltage Vo greater than 1V.
When the output voltage becomes higher than Vo_th then Res goes high with a delay trd.
This delay is obtained by an internal oscillator.
The oscillator period is given by:
Equation 1
Tosc = [(VRhth-VRlth) x Ctr] / Icr + [(VRhth-VRlth) x Ctr] / Idr
where:
Icr :is an internally generated charge current
Idr :is an internally generated discharge current
VRhth, VRlth:are two voltages defined with the output voltage and a resistor output
divider
Ctr :is an external capacitance.
trd is given by:
Equation 2
trd = (VRhth x Ctr)/Icr + 3 x Tosc
18/35
Doc ID 13103 Rev 13
L4995
Application information
Reset is active when En is high.
Figure 29. Reset timing diagram
Wi
Vo
Vout_th
< trr
Vcr
Tosc
Vrhth
trr
Vrlth
trd
Res
GAPGMS00077
3.3
Watchdog
A connected microcontroller is monitored by the watchdog input Wi. If pulses are missing,
the Reset output pin is set to low. The pulse sequence time can be set within a wide range
with 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 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 t, during which the micro-controller must output the positive edge, the
following equation can be used:
Equation 3
(Vwhth-Vwlth) x Ctw = Icwd x t
Every Wi positive edge switches the current source from discharging to charging. The same
happens when the lower 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 30. Watchdog timing diagram
:L
7ZRS
9FZ
9ZKWK
9ZOWK
7ZRO
5HV
'!0'-3
Doc ID 13103 Rev 13
19/35
Package and PCB thermal data
L4995
4
Package and PCB thermal data
4.1
PowerSSO-12 thermal data
Figure 31. PowerSSO-12 PC board(1)
("1($'5
1. Layout condition of Rth and Zth measurements (PCB: Double layer, Thermal Vias, FR4 area= 77mm x
86mm,PCB thickness=1.6mm, Cu thickness=70μm (front and back side) Thermal vias separation 1.2 mm,
Thermal via diameter 0.3 mm +/- 0.08 mm, Cu thickness on vias 0.025 mm, Footprint dimension 4.1 mm x
6.5 mm).
Figure 32. Rthj-amb vs PCB copper area in open box free air condition
RTHj _amb(
_a
° C/ W)
70
65
60
55
50
45
40
0
2
4
6
eat sink area
ea ( cm^ 2)
PCB Cu hea
20/35
Doc ID 13103 Rev 13
8
10
GAPGMS00082
L4995
Package and PCB thermal data
Figure 33. PowerSSO-12 thermal impedance junction ambient single pulse
ZTH ( °C/ W)
100
Footprint
2 cm2
8 cm2
10
1
0,1
0,0001
0,001
0,01
0,1
1
Time ( s)
10
100
1000
Equation 4: pulse calculation formula
Z
THδ
= R
TH
⋅δ+Z
THtp
(1 – δ)
where δ = tP/T
Figure 34. Thermal fitting model of Vreg in PowerSSO-12
'!0'-3
Doc ID 13103 Rev 13
21/35
Package and PCB thermal data
Table 9.
22/35
L4995
PowerSSO-12 thermal parameter
Area/island (cm2)
Footprint
R1 (°C/W)
0.45
R2 (°C/W)
1.79
R3 (°C/W)
7
R4 (°C/W)
2
8
10
10
9
R5 (°C/W)
22
15
10
R6 (°C/W)
26
20
15
C1 (W.s/°C)
0.001
C2 (W.s/°C)
0.0022
C3 (W.s/°C)
0.05
C4 (W.s/°C)
0.2
0.1
0.1
C5 (W.s/°C)
0.27
0.8
1
C6 (W.s/°C)
3
6
9
Doc ID 13103 Rev 13
L4995
4.2
Package and PCB thermal data
PowerSSO-24 thermal data
Figure 35. PowerSSO-24 PC board(1)
GAPGCFT00418
1. Layout condition of Rth and Zth measurements (PCB: Double layer, Thermal Vias, FR4 area= 77mm x
86mm,PCB thickness=1.6mm, Cu thickness=70μm (front and back side) Thermal vias separation 1.2 mm,
Thermal via diameter 0.3 mm +/- 0.08 mm, Cu thickness on vias 0.025 mm, Footprint dimension 4.1 mm x
6.5 mm).
Figure 36. Rthj-amb vs PCB copper area in open box free air condition
57+M BDPE& :
3&%&XKHDWVLQNDUHDFPA
'!0'-3
Doc ID 13103 Rev 13
23/35
Package and PCB thermal data
L4995
Figure 37. PowerSSO-24 thermal impedance junction ambient single pulse
ZTH (° C/ W)
100
Footprint
2 cm2
8 cm2
10
1
0,1
0,0001
0,001
0,01
0,1
1
Time ( s)
10
100
1000
Equation 5: pulse calculation formula
Z
THδ
= R
TH
⋅δ+Z
THtp
(1 – δ)
where δ = tP/T
Figure 38. Thermal fitting model of Vreg in PowerSSO-24
'!0'-3
24/35
Doc ID 13103 Rev 13
L4995
Package and PCB thermal data
Table 10.
PowerSSO-24 thermal parameter
Area/island (cm2)
Footprint
R1 (°C/W)
0.45
R2 (°C/W)
1.79
R3 (°C/W)
6
R4 (°C/W)
7.7
R5 (°C/W)
2
8
9
9
8
R6 (°C/W)
28
17
10
C1 (W.s/°C)
0.001
C2 (W.s/°C)
0.0022
C3 (W.s/°C)
0.025
C4 (W.s/°C)
0.75
C5 (W.s/°C)
1
4
9
C6 (W.s/°C)
2.2
5
17
Doc ID 13103 Rev 13
25/35
Package and packing information
L4995
5
Package and packing 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.
Figure 39. PowerSSO-12 package dimensions
26/35
Doc ID 13103 Rev 13
L4995
Package and packing information
Table 11.
PowerSSO-12 mechanical data
Millimeters
Symbol
Min.
Typ.
Max.
A
1.250
1.620
A1
0.000
0.100
A2
1.100
1.650
B
0.230
0.410
C
0.190
0.250
D
4.800
5.000
E
3.800
4.000
e
0.800
H
5.800
6.200
h
0.250
0.500
L
0.400
1.270
k
0º
8º
X
2.200
2.800
Y
2.900
3.500
ddd
0.100
Doc ID 13103 Rev 13
27/35
Package and packing information
5.2
L4995
PowerSSO-24 mechanical data
Figure 40. PowerSSO-24 package dimensions
("1($'5
28/35
Doc ID 13103 Rev 13
L4995
Package and packing information
PowerSSO-24 mechanical data(1)(2)
Table 12.
Millimeters
Symbol
Min.
Typ.
A
Max.
2.45
A2
2.15
2.35
a1
0
0.10
b
0.33
0.51
c
0.23
0.32
D(3)
10.10
10.50
E(3)
7.40
7.60
e
0.8
e3
8.8
F
2.3
G
0.1
G1
0.06
H
10.1
10.5
h
0.4
k
0°
8°
L
0.55
0.85
O
1.2
Q
0.8
S
2.9
T
3.65
U
1
N
10º
X
4.1
4.7
Y
6.5
4.9(4)
7.1
5.5(4)
1. No intrusion allowed inwards the leads.
2. Flash or bleeds on exposed die pad shall not exceed 0.4 mm per side
3. “D and E” do not include mold Flash or protusions.
Mold Flash or protusions shall not exceed 0.15 mm.
4. Variations for small window leadframe option.
Doc ID 13103 Rev 13
29/35
Package and packing information
5.3
L4995
PowerSSO-12 packing information
Figure 41. PowerSSO-12 tube shipment (no suffix)
B
Base q.ty
Bulk q.ty
Tube length (± 0.5)
A
B
C (± 0.1)
C
A
100
2000
532
1.85
6.75
0.6
All dimensions are in mm.
Figure 42. PowerSSO-12 tape and reel shipment (suffix “TR”)
REEL DIMENSIONS
Base q.ty
Bulk q.ty
A (max)
B (min)
C (± 0.2)
F
G (+ 2 / -0)
N (min)
T (max)
2500
2500
330
1.5
13
20.2
12.4
60
18.4
TAPE DIMENSIONS
According to Electronic Industries Association
(EIA) Standard 481 rev. A, Feb. 1986
Tape width
Tape hole spacing
Component spacing
Hole diameter
Hole diameter
Hole position
Compartment depth
Hole spacing
W
P0 (± 0.1)
P
D (± 0.05)
D1 (min)
F (± 0.1)
K (max)
P1 (± 0.1)
12
4
8
1.5
1.5
5.5
4.5
2
All dimensions are in mm.
End
Start
Top
No components
Components
No components
cover
tape
500mm min
Empty components pockets
saled with cover tape.
User direction of feed
30/35
Doc ID 13103 Rev 13
500mm min
L4995
5.4
Package and packing information
PowerSSO-24 packing information
Figure 43. PowerSS0-24 tube shipment (no suffix)
C
B
A
GAPGCFT00002
Figure 44. PowerSSO-24 tape and reel shipment (suffix “TR”)
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TAPE
.OCOMPONENTS #OMPONENTS
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.OCOMPONENTS
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%MPTYCOMPONENTSPOCKETS
SALEDWITHCOVERTAPE
5SERDIRECTIONOFFEED
("1($'5
Doc ID 13103 Rev 13
31/35
Revision history
6
L4995
Revision history
Table 13.
32/35
Document revision history
Date
Revision
Changes
26-May-2006
1
Initial release.
05-Jan-2007
2
L4995A and L4995R versions added:
Features section updated and table added.
Table 1 updated.
Table 5: General, Watchdog Iwi entry updated.
Figure 2: Block diagram of L4995A and Figure 3: Block diagram of
L4995R added.
Table 2: Pins descriptions updated.
Table 4: Thermal data updated.
List of tables and List of figures added.
Packaging information provided in new format.
Table 11: PowerSSO-12 mechanical data X and Y values updated.
Some sections reformatted for clarity.
New disclaimer added.
18-May-2007
3
Updated Table 2: Pins descriptions.
Updated Figure 4: Pins configurations (L4995).
Table 1: Device summary changed title.
09-Jul-2007
4
Updated Table 2: Pins descriptions.
09-Aug-2007
5
Updated Table 2: Pins descriptions.
Updated Table 12: PowerSSO-24 mechanical data.
Doc ID 13103 Rev 13
L4995
Revision history
Table 13.
Document revision history (continued)
Date
Revision
Changes
6
Updated Section 2.2: Thermal data:
– corrected note changing single layer with double layer.
Updated Table 5: General:
– changed Ishort typ. value from 750 to 800 mA
– added Ishort max. value
– changed Ilim typ. value from 820 to 900 mA
– added Ilim max. value
– added Ilim note
– added Vdp note
– changed Iqn_1 typ. value from 110 to 90 µA
– added Iqn_1 max. value
– added Iqn_50 max. value
– added Iqn_150 max. value
– changed Iqn_250 typ. value from 1.2 to 1 mA
– added Iqn_250 max. value
– changed Iqn_500 typ. value from 2.4 to 2.1 mA
– added Iqn_500 max. value
Updated Table 6: Reset:
– changed VRlth parameter definition from “Reset timing low” to
“Reset delay circuit low threshold”
– changed VRhth parameter definition from “Reset timing high” to
“Reset delay circuit high threshold”
– added Trd min. and max. values
Updated Table 7: Watchdog:
– added Iwi max value
Updated Table 8: Enable:
– changed Pull down current symbol from REn to IEn
– changed IEn typ. value from 2.5 to 10 µA
– added IEn max. value
Added Section 2.4: Electrical characteristics curves.
Added Section 2.5: Test circuit and waveforms plot.
Added Section 4: Package and PCB thermal data
03-Oct-2008
7
Updated PowerSSO-24 information:
– changed Figure 40: PowerSSO-24 package dimensions
– changed Table 12: PowerSSO-24 mechanical data.
19-Mar-2009
8
Updated Table 4: Thermal data
9
Updated Table 2: Pins descriptions.
Updated Figure 4: Pins configurations (L4995)
– Changed GND to substrate
07-Dec-2007
19-May-2009
Doc ID 13103 Rev 13
33/35
Revision history
L4995
Table 13.
Document revision history (continued)
Date
34/35
Revision
Changes
24-Jun-2009
10
Table 12: PowerSSO-24 mechanical data:
– Deleted A (min) value
– Changed A (max) value from 2.50 to 2.45
– Changed A2 (max) value from 2.40 to 2.35
– Updated K row
– Changed L (min) value from 0.6 to 0.55
– Changed L (max) value from 1 to 0.85
12-Jul-2010
11
Added Figure 27: Stability region(1).
09-Mar-2012
12
Added footnote in Table 3: Absolute maximum ratings.
17-Oct-2012
13
Table 6: Reset:
– Trd: updated min, typ and max values
Doc ID 13103 Rev 13
L4995
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