Datasheet

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This is information on a product in full production.

September 2013 Doc ID 13103 Rev 14 1/35

L4995

5V, 500mA low drop voltage regulator

Datasheet

−

production data

Features

■

Operating DC supply voltage range 5.6V to

31V

■

Low dropout voltage

■

Low quiescent current consumption

■

Reset circuit sensing of output voltage down to

■

Programmable reset pulse delay with external

capacitor

■

Programmable watchdog

(a)

timer with external

capacitor

■

Thermal shutdown and short circuit protection

■

Wide temperature range (T

= -40°C to 150°C)

■

Enable

(a)

input for enabling/disabling the

voltage regulator

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.

Max DC supply voltage V

40V

Max output voltage tolerance ΔV

+/-2%

Max dropout voltage V

500mV

Output current I

500mA

Quiescent current I

3µA

(1)

1. Typical value with regulator disabled

a. Watchdog and Enable facilities are available

according to Device summary table.

Po we rSSO-12 PowerSSO-24

Table 1. Device summary

Package

Order codes

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 -

www.st.com

Summary of content (35 pages)

PAGE 1
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.
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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 . . . . . . . . . . . . . . .
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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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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.
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L4995 1 Block diagrams and pins descriptions Block diagrams and pins descriptions Figure 1. Block diagram of L4995 9R 9V ,V ,R 9RV 6 6WDUW XS 6 , 9 (Q 9ROWDJH 5HIHUHQFH (Q 9(Q ,FZ 9R P9 B 9FZ 9FZ 5HV :L ZDWFKGRJ 9ZL 9FU 9FU /RZ 9ROWDJH 5HVHW *1' 9 5HV ("1(.4 Figure 2.
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Block diagrams and pins descriptions Figure 3. L4995 Block diagram of L4995R ,V 9R 9V ,R 9RV 9 6WDUW XS 6 9 9ROWDJH 5HIHUHQFH 9R P9 B 9(Q 5HV 9FU 9FU *1' /RZ 9ROWDJH 5HVHW 9 5HV *$3*06 Table 2. Pin name 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.
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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.
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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.
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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.
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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.
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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.
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Electrical specifications L4995 2.4 Electrical characteristics curves Figure 5. Output voltage vs Tj Figure 6. Output voltage vs VS 9RBUHI 9 9RBUHI 9 9V 9 , P$ , P$ 7M & *$3*06 *$3*06 Figure 7. 9V 9 7M & Drop voltage vs output current 9GS 9 Figure 8.
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L4995 Electrical specifications Figure 11. Current limitation vs input voltage Figure 12. Short circuit current vs input voltage e ,OLP P$ ,VKRUW P$ 7M & 7M & 7M & 7M & 9V 9 *$3*06 9V 9 *$3*06 Figure 13. Output voltage vs enable voltage Figure 14.
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Electrical specifications L4995 Figure 17. VRlth vs Tj Figure 18. Vwhth vs Tj 9UOWK 9RBUHI 9ZKWK 9RBUHI 9V 9 WR 9 9V 9 WR 9 7M & 7M & *$3*06 Figure 19. Vwlth vs Tj *$3*06 Figure 20.
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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.
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Electrical specifications L4995 Figure 25.
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L4995 Application information Figure 26. L4995 application schematic(1) 9R 9V 9L 6R V 9R &R &R 6WDUW XS 9 (Q JQG 9ROWDJH 5HIHUHQFH P9 B 9FZ &WZ 5HV ZDWFKGRJ :L /RZ 9ROWDJH 5HVHW 9FU &WU *$3*06 1. The input capacitor Cs > 200nF is necessary for the smoothing of line disturbances. The output capacitor C01 > 100nF is necessary for the stability of the regulation loop.
PAGE 18
Application information 3.1 L4995 Voltage regulator Voltage regulator uses a p-channel transistor as a regulating element. With this structure, very low dropout voltage at current up to 500mA is obtained. The output voltage is regulated up to transient input supply voltage of 40V. No functional interruption due to over-voltage pulses is generated. A short circuit protection to GND is provided. The voltage regulator is active when En is high. Figure 28.
PAGE 19
L4995 Application information Reset is active when En is high. Figure 29. Reset timing diagram Wi Vo Vout_th < trr Vcr Tosc Vrhth trr Vrlth trd Res GAPGMS00077 3.3 Watchdog A connected microcontroller is monitored by the watchdog input Wi. If pulses are missing, the Reset output pin is set to low. The pulse sequence time can be set within a wide range with the external capacitor, Ctw. The watchdog circuit discharges the capacitor Ctw, with the constant current Icwd.
PAGE 20
Package and PCB thermal data L4995 4 Package and PCB thermal data 4.1 PowerSSO-12 thermal data Figure 31. PowerSSO-12 PC board(1) ("1($'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.
PAGE 21
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.
PAGE 22
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.
PAGE 23
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.
PAGE 24
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 Equation 5: pulse calculation formula Z THδ = R TH ⋅δ+Z THtp (1 – δ) where δ = tP/T Figure 38.
PAGE 25
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.
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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.
PAGE 27
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.
PAGE 28
Package and packing information 5.2 L4995 PowerSSO-24 mechanical data Figure 40.
PAGE 29
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.
PAGE 30
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.
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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.
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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.
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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.
PAGE 34
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.
PAGE 35
L4995 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.