L4987CPT50

L4987Cxx Very low drop voltage regulators with inhibit and dropout control flag Features ■ Very low dropout voltage (0.25 V typ.) ■ Dropout control flag ■ Very low quiescent current ■ (Typ. 90 mA in OFF Mode, 500 mA in ON Mode) ■ Output current up to 200 mA ■ Logic-controlled electronic shutdown ■ Output voltages of 3.3 V, 5 V ■ Internal current and thermal limit ■ Only 2.2 µF for stability ■ Available in ± 2% selection at 25°C ■ Supply voltage rejection: 70 dB (typ.) PPAK ) s t( c u d o r notebook) it is possible to use the flag to monitor the battery charge status through the dropout of the regulator. l o bs Description The L4987 is a very low drop regulator available in PPAK. The very low drop-voltage (0.5 V Max at 200 mA) and the very low quiescent current make it particularly suitable for low noise, low power applications, and in battery powered systems. The input dump protection up to 40 V makes it ideal for automotive applications. a shutdown Logic Control function is available (pin 2, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The regulator employs an output pin (open collector) providing a logic signal when the pass transistor is in saturation at low input voltage, this signal can be used to prevent the pop-up phenomenon in the car radio. In battery powered systems (the cellular phone, P e et O ) s ( t c u d o r eP t e ol s b O Table 1. Device summary Part number Order code Output voltage L4987Cxx33 L4987CPT33TR 3.3 V L4987Cxx50 L4987CPT50TR 5.0 V September 2007 Rev. 6 1/16 www.st.com 16 L4987Cxx Contents 1 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Application hint of L4987CPT33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1 c u d o Package mechanical data . . . . . . . . . . . . . . . . . . . . . . .r. . . . . . . . . . . . . 12 P e Revision history . . . . . . . . . . . . . . . . . . . . . . .t. . . . . . . . . . . . . . . . . . . . 15 le o s b O ) s t( c u d o r P e t e ol 7 8 9 s b O 2/16 ) s t( How to use the control flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 L4987Cxx Schematic diagram 1 Schematic diagram Figure 1. Schematic diagram ) s t( c u d o r l o bs P e et O ) s ( t c u d o r eP t e ol s b O 3/16 Pin configuration L4987Cxx 2 Pin configuration Figure 2. Pin connections (top view) ) s t( c u d o r l o bs O ) s ( t c u d o r eP t e ol s b O 4/16 P e et L4987Cxx Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit 40 V VI DC Input voltage IO Output current Internally Limited Ptot Power dissipation Internally Limited Tstg Storage temperature range -40 to 150 °C Top Operating junction temperature range -40 to 125 °C Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied Table 3. Thermal data Symbol c u d o r Parameter RthJC Thermal resistance junction-case RthJA Thermal resistance junction-ambient ) s t( PPAK l o bs Unit 8 °C/W 100 °C/W P e et O ) s ( t c u d o r eP t e ol s b O 5/16 Electrical characteristics L4987Cxx 4 Electrical characteristics Table 4. Electrical characteristics of L4987Cxx33 (refer to the test circuits, VI = 6.3 V, IO = 5 mA, TJ = 25°C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. IO = 200 mA, VI = 6.3 V 3.234 3.3 3.366 IO = 200 mA, VI = 6.3 V, TJ=-40 to 125°C 2.76 3.432 4 18 Unit VO Output voltage VI Operating input voltage Iout Output current limit ΔVO Line regulation VI = 4.6 to 18 V, IO = 0.5 mA 2.4 14 mV ΔVO Load regulation VI = 4.4 V, IO = 0.5 to 200 mA 3 20 mV Quiescent current ON MODE VI = 4.6 to 18 V, IO = 0 mA 0.7 1 VI = 4.6 to 18 V, IO = 200 mA 1.5 6 OFF MODE VI = 12 V 90 180 Supply voltage rejection IO = 5 mA VI = 5.6 ± 1 V Id V IO = 200 mA 250 A mA IO = 200 mA Vd Dropout voltage VIL Control input logic low TJ = -40 to 125°C VIH Control input logic high TJ = -40 to 125°C O ) Control input current CO Output bypass capacitance VFL Control flag output low IFH Control flag output high leakage current s b O 75 P e et ESR = 0.5 to 10 Ω, IO = 0 to 200 mA TJ= -40 to 125°C c u d o r eP t e ol 6/16 l o bs IO = 200 mA, TJ=-40 to 125°C II 80 f = 1 KHz f = 10 KHz t(s ) s t( c u d o r f = 120 Hz SVR V dB 60 0.25 0.5 V 0.7 0.8 2 2 µA V V 10 µA 10 µF VI - VO < VCESAT power, IFL = 6mA IO = 200mA 0.5 V VI > 4 V, VOH = 15 V 10 µA L4987Cxx Table 5. Electrical characteristics Electrical characteristics of L4987Cxx50 (refer to the test circuits, VI = 8 V, IO = 5 mA, TJ = 25°C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. IO = 200 mA, VI = 8 V 4.9 5 5.1 IO = 200 mA, VI = 8 V, TJ = - 40 to 125°C 4.8 5.2 IO = 200 mA 5.7 18 Unit VO Output voltage VI Operating input voltage Iout Output current limit ΔVO Line regulation VI = 6.3 to 18 V, IO = 0.5 mA 3 20 mV ΔVO Load regulation VI = 6.3 V, IO = 0.5 to 200 mA 3 20 mV Quiescent current ON MODE VI = 6.3 to 18 V, IO = 0 mA 0.7 1 VI = 6.3 to 18 V, IO = 200 mA 1.5 6 OFF MODE VI = 12 V 90 180 Supply voltage rejection IO = 5 mA VI = 7.3 ± 1 V Id SVR V 250 A mA f = 120 Hz 76 f = 1 KHz 71 f = 10 KHz 58 Dropout voltage VIL Control input logic low TJ = -40 to 125°C VIH Control input logic high TJ = -40 to 125°C 0.3 IO = 200 mA, TJ = -40 to 125°C ) s t( dB 0.5 V 0.7 eP let o s b Control input current µA c u d o r IO = 200 mA Vd II V 0.8 2 V V 10 µA 10 µF CO Output bypass capacitance ESR = 0.5 to 10 Ω, IO = 0 to 200 mA TJ= -40 to 125°C VFL Control flag output low VI - VO < VCESAT power, IFL = 6 mA IO = 200 mA 0.5 V IFH Control flag output high leakage current VI > 5.85 V, VOH = 15 V 10 µA O ) s ( t c u d 2 o r eP t e ol s b O 7/16 Typical characteristics L4987Cxx 5 Typical characteristics Figure 3. (Unless otherwise specified TJ = 25°C, CI = CO = 0.1 µF) Output and flag voltage vs input Figure 4. Output voltage vs input voltage voltage Figure 5. Output and flag voltage vs input voltage Figure 6. ) s t( c u d o r Output voltage vs input voltage l o bs P e et O ) s ( t c u d Figure 7. o r eP Output and flag voltage vs inp. volt. Figure 8. t e l o s Ob 8/16 Output voltage vs input voltage L4987Cxx Application hint of L4987CPT33 6 Application hint of L4987CPT33 6.1 How to use the control flag The flag produces a logic "low" whenever the output drops out of regulation. An "out of regulation condition can result from: 1) Low input voltage (VIN ≤VOUT + VDROP) 2) Current limiting 3) Thermal limiting Figure 3. to Figure 4. show the typical behavior of the output voltage and the control flag versus the input voltage and the temperature. No hysteresis is implemented; so the response of VOUT and VFLAG are the same either when the VIN ramps up or down. The control flag is an open collector which requires an external pull-up resistor. This may be connected to the regulator output (Figure 11.) or some other supply voltage (Figure 12.). Using the regulator output prevents an invalid "high" on the flag which occurs if it is pulled up to an external voltage while the regulator input voltage is reduced below about 2 V (Figure 13.). ) s t( c u d o r Concerning the pull-up resistor its value must be properly chosen as suggested below. When "low" as it is possible to see in Figure 7. the control flag voltage is: VFLAG(LOW) = VCE = 0.5 = VSUPPLY - RPULL x IFL P e et VSUPPLY is chosen by design and, thus is known, while IFL must be at maximum 10 mA. l o bs Then 0.5 V ≥ VSUPPLY - RPULL x 10 mA The minimum value of RPULL, is, so, determined by the following equation: O ) RPULL(min) ≥ VSUPPLY - 0.5/10 mA Regarding the maximum value of RPULL note that its value depends of the type of logic used (CMOS, TTL etc.), the transistor leakage current and the presence or not of a load on VFLAG. s ( t c u d The following example shows how to determine the RPULL max in the case of CMOS logic, no load and 10 µA (for L4987 it is the maximum value of IFH) of control flag leakage current. o r eP Because of CMOS logic: t e ol VFLAG(HIGH) ≥ 2/3 VSUPPLY but: s b O VFLAG(HIGH) = VSUPPLY - RPULL x IFH ≥ 2/3 VSUPPLY so, the maximum value is determined by the following equation: RPULL(MAX) ≤(1/3 VSUPPLY)/10 mA 9/16 Application hint of L4987CPT33 Figure 9. L4987Cxx Output and flag voltage vs input Figure 10. Flag voltage vs input ) s t( c u d o r l o bs O ) s ( t c u d o r eP t e ol s b O 10/16 P e et L4987Cxx 7 Test circuits Test circuits Figure 11. Test circuit ) s t( c u d o r Figure 12. Single antenna receiver with master receiver port l o bs P e et O ) s ( t c u d o r eP Figure 13. Equivalent output circuit t e ol Figure 14. Output and flag voltage vs input s b O 11/16 Package mechanical data 8 L4987Cxx Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. ) s t( c u d o r l o bs O ) s ( t c u d o r eP t e ol s b O 12/16 P e et L4987Cxx Package mechanical data PPAK mechanical data mm. inch. Dim. Min. A Typ. 2.2 Max. Min. Typ. Max. 2.4 0.086 0.094 A1 0.9 1.1 0.035 0.043 A2 0.03 0.23 0.001 0.009 B 0.4 0.6 0.015 0.023 B2 5.2 5.4 0.204 0.212 C 0.45 0.6 0.017 0.023 C2 0.48 0.6 0.019 0.023 D 6 6.2 0.236 0.244 D1 E 5.1 6.4 0.201 6.6 0.252 0.260 E1 4.7 0.185 e 1.27 0.050 G 4.9 5.25 0.193 G1 2.38 2.7 0.093 H 9.35 10.1 0.368 L2 0.8 L4 0.6 L5 1 L6 c u d o r 0.206 0.106 1 0.031 1 0.023 0.039 eP t e l o s b 2.8 ) s t( 0.397 0.039 0.039 0.110 O ) s ( t c u d o r eP t e ol s b O 0078180-E 13/16 Package mechanical data L4987Cxx Tape & reel DPAK-PPAK mechanical data mm. inch. Dim. Min. Typ. A Max. Min. 330 13.0 Max. 13.2 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 0.504 0.512 22.4 0.519 0.882 Ao 6.80 6.90 7.00 0.268 0.272 0.2.76 Bo 10.40 10.50 10.60 0.409 0.413 0.417 Ko 2.55 2.65 2.75 0.100 0.104 0.105 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 7.9 8.0 8.1 0.311 0.315 0.319 l o bs O ) s ( t c u d o r eP t e ol s b O 14/16 Typ. P e et c u d o r ) s t( L4987Cxx Revision history 9 Revision history Table 6. Document revision history Date Revision Changes 22-Jun-2004 4 VO min and VO max values in Table 5, pag. 4 have been corrected. 04-Sep-2006 5 The IFH value on table 7 has been updated and new template. 26-Sep-2007 6 Add Table 1. in cover page. ) s t( c u d o r l o bs P e et O ) s ( t c u d o r eP t e ol s b O 15/16 L4987Cxx Please Read Carefully: Information in this document is provided solely in connection with ST products. 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