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L4995 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L4995은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 L4995 기능
기능 500mA low drop voltage regulator
제조업체 STMicroelectronics
로고 STMicroelectronics 로고


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L4995 데이터시트, 핀배열, 회로
L4995
5V, 500mA low drop voltage regulator
Features
Datasheet production data
Max DC supply voltage
Max output voltage tolerance
Max dropout voltage
Output current
Quiescent current
VS
ΔV0
Vdp
I0
Iqn
1. Typical value with regulator disabled
40V
+/-2%
500mV
500mA
3µA(1)
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
a. Watchdog and Enable facilities are available
according to Device summary table.
PowerSSO-12
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.
Table 1. Device summary
Package
Tube
Order codes
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
Free Datasheet http://www.datasheet4u.com/




L4995 pdf, 반도체, 판매, 대치품
List of figures
List of figures
L4995
Figure 1.
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Figure 42.
Figure 43.
Figure 44.
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
4/35
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L4995 전자부품, 판매, 대치품
L4995
Block diagrams and pins descriptions
Table 2.
Pin
name
Wi
Vos
Vo
VS
Pins descriptions (continued)
PowerSSO-12 PowerSSO-24
pin #
pin #
Function
Watchdog input (L4995 only, otherwise not connected).
9 4 If the frequency at this input pin is too low, the Reset
output is activated.
10 7 Regulator voltage output sensing.
5 voltage regulator output.
11 8 Block to ground with a capacitor >100nF (needed for
regulator stability).
Supply voltage.
12 10 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
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