LDFM 500 mA very low drop voltage regulator Datasheet - production data Applications • PCs and laptop computers • Battery-powered equipment • Industrial and medical equipment ')1 [ • Portable equipment 33$. Description ')1 [ The LDFM is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.5 V to 16 V. '3$. It is available in fixed and adjustable output voltage versions, from 0.8 V to 12 V. Features • Very low dropout voltage (300 mV max.
Contents LDFM Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . .
LDFM 1 Block diagram Block diagram Figure 1.
Pin configuration 2 LDFM Pin configuration Figure 2. Pin connection (top view) 7$% 7$% 33$. '3$. ')1 $0 9 Table 1. Pin description DPAK, PPAK Pin n° Symbol Function PPAK DPAK 5 - ADJ/PG 2 1 VIN 4 3 VOUT 1 - EN 3 2 GND Ground TAB TAB GND Ground For adjustable versions: Error amplifier input pin. For fixed version: Power Good output Input voltage Output voltage Enable pin logic input: Low = shutdown, High = active Table 2.
LDFM 3 Typical application Typical application Figure 3. Fixed versions 33$. DQG ')1 SDFNDJHV '3$. SDFNDJH $0 9 Figure 4. Adjustable version (PPAK and DFN6 packages only) ')1 SDFNDJHV 33$.
Absolute maximum ratings 4 LDFM Absolute maximum ratings Table 3. Absolute maximum ratings Symbol VIN Parameter DC input voltage Value Unit - 0.3 to 20 V VOUT DC output voltage - 0.3 to VIN + 0.3 V VEN Enable input voltage - 0.3 to VIN + 0.3 V VADJ Adjust pin voltage - 0.3 to 2 V VPG Power Good pin voltage - 0.3 to VIN + 0.
LDFM 5 Electrical characteristics Electrical characteristics TJ = 25 °C, VIN = VOUT(NOM) + 1 V (1), CIN = 1 µF, COUT = 2.2 µF, ILOAD = 10 mA, VEN = 2 V, unless otherwise specified. Table 5. Electrical characteristics for LDFM (fixed versions) Symbol Parameter VIN Operating input voltage VOUT VOUT VOUT accuracy, PPAK and DFN6 versions VOUT accuracy, DPAK version Test conditions Min. Max. Unit 2.
Electrical characteristics LDFM Table 5. Electrical characteristics for LDFM (fixed versions) (continued) Symbol SVR eN TSHDN Parameter Supply voltage rejection Output noise voltage Test conditions Min. Typ. VIN = 6 V +/- 0.5 VRIPPLE Freq. = 120 Hz, VOUT = 5 V 60 VIN = 6 V +/- 0.5 VRIPPLE Freq. = 10 kHz, VOUT = 5 V 52 Bw = 10 Hz to 100 kHz, ILOAD = 100 mA. COUT = 2.2 µF 45 Max. Unit dB Thermal shutdown 170 Hysteresis 10 µVRMS /VOUT °C 1. For VOUT<1.5 V; VIN = 2.5 V 2.
LDFM Electrical characteristics TJ = 25 °C, VIN = VOUT(NOM) + 1 V (1), CIN = 1 µF, COUT = 2.2 µF, ILOAD = 10 mA, VEN = 2 V, unless otherwise specified. Table 6. Electrical characteristics for LDFM (adjustable version) Symbol Parameter VIN Operating input voltage Reference voltage Test conditions Min. Typ. 2.5 VIN = VOUT+1 V(1) Max. Unit 16 V 0.8 V (1) VADJ Reference voltage tolerance VOUT+1 V ≤ VIN ≤ 16 V ILOAD = 10 mA -1 10 mA ≤ ILOAD ≤ 500 mA TJ = -40 to 125 °C -1.
Electrical characteristics LDFM Table 6. Electrical characteristics for LDFM (adjustable version) (continued) Symbol TSHDN Parameter Test conditions Min. Typ. Thermal shutdown 170 Hysteresis 10 Max. Unit °C 1. For VOUT<1.5 V; VIN = 2.5 V. 2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply for output voltages below 1.5 V.
LDFM Application information 6 Application information 6.1 External capacitors The LDFM requires external capacitors for regulator stability. These capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see Figure 25 and 26). It is advisable to locate the input/output capacitors as close as possible to the relative pins. 6.1.1 Input capacitor An input capacitor with a minimum value of 1 µF is required with the LDFM.
Typical performance characteristics 7 LDFM Typical performance characteristics CIN = COUT = 1 µF, VIN = VOUT +1 V, VEN to VIN, IOUT = 10 mA, unless otherwise specified. Figure 5. Output voltage vs. temperature Figure 6. Output voltage vs. temperature for adjustable AM12772v1 815 Adjustable version, VIN = 2.5 V, IOUT = 10 mA AM12771v1 5.20 5 V version, VIN = VOUT + 1 V, IOUT = 10 mA 5.15 810 5.10 VADJ [ V ] 805 VOUT [V] 5.05 5.00 800 4.95 795 4.90 4.85 790 4.
LDFM Typical performance characteristics Figure 11. Quiescent current vs. temperature (IOUT = 10 mA) Figure 12. Quiescent current vs. temperature (IOUT = 500 mA) 0.5 250 Iq [mA] 200 Iq [µA] AM12778v1 0.6 AM12777v1 300 150 0.4 0.3 100 0.2 50 0.1 0 0 -50 -25 0 25 50 75 Temperature [°C ] 100 125 -50 150 -25 0 25 50 75 Temperature [°C ] 100 125 150 I OUT = 500mA I OUT =10mA Figure 13. Shutdown current vs. temperature Figure 14. Enable pin current vs.
Typical performance characteristics LDFM Vout [V] Figure 17. Output voltage vs. input voltage 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Figure 18. Line transient AM12783v1 5 V version, CIN = 1 µF, COUT = 2.2 µF, I OUT = 500 mA VOUT = 3.3 V VIN VOUT 2 2.3 2.6 2.9 3.2 3.5 3.8 4.1 4.4 4.7 Vin [V] 5 5.3 5.6 5.9 VIN = from 4.5 to 6.5 V, IOUT = 10 mA, trise = tfall = 10 µs, COUT = 2.2 µF Figure 19. Load transient (VOUT = 3.3 V) VOUT Figure 20.
LDFM Typical performance characteristics Figure 23. SVR vs. frequency (VOUT = 5 V) AM12784v1 70 AM12785v1 70 V IN = 6 V +/- 0.5 V, I OUT = 0.01 A, C OUT = 2.2 µF 65 VIN = 1.8 +/- 0.5 V, I OUT = 10 mA; COUT = 2.2 µF 65 60 60 55 55 50 50 45 45 SVR [dB] SVR [dB] Figure 24. SVR vs. frequency (VOUT = VADJ) 40 35 40 35 30 30 25 25 20 20 15 10 100 15 VOUT = 5 V 1000 10000 VOUT = V ADJ 10 100 100000 1000 Frequency [Hz] Figure 25. Stability plane adj (COUT, ESR) 3.
Package mechanical data 8 LDFM Package mechanical data 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. Table 7. DPAK mechanical data mm Dim. Min. Typ. A 2.20 2.40 A1 0.90 1.10 A2 0.03 0.23 b 0.64 0.90 b4 5.20 5.40 c 0.45 0.60 c2 0.48 0.60 D 6.00 6.
LDFM Package mechanical data Figure 27.
Package mechanical data LDFM Figure 28. DPAK footprint (a) Footprint_REV_K a. All dimensions are in millimeters.
LDFM Package mechanical data Table 8. PPAK mechanical data mm Dim. Min. Typ. Max. A 2.2 2.4 A1 0.9 1.1 A2 0.03 0.23 B 0.4 0.6 B2 5.2 5.4 C 0.45 0.6 C2 0.48 0.6 D 6 6.2 D1 E 5.1 6.4 6.6 E1 4.7 e 1.27 G 4.9 5.25 G1 2.38 2.7 H 9.35 10.1 L2 0.8 L4 0.6 L5 1 1 L6 2.8 R 0.
Package mechanical data LDFM Figure 29.
LDFM Package mechanical data Table 9. DFN6 (3 x 3 mm) mechanical data mm Dim. Min. A 0.80 A1 0 Typ. 1 0.02 A3 0.05 0.20 b 0.23 D 2.90 D2 2.23 E 2.90 E2 1.50 0.45 3 3.10 2.50 3 3.10 1.75 e L Max. 0.95 0.30 0.40 DocID023585 Rev 2 0.
Package mechanical data LDFM Figure 30.
LDFM Package mechanical data Figure 31.
Package mechanical data LDFM Table 10.DFN6 (2 x 2 mm) mechanical data mm Dim. 24/34 Min. Typ. Max. A 0.80 0.90 1.00 A1 0.00 0.02 0.05 b 0.25 0.30 0.35 D 2.00 BSC E 2.00 BSC e 0.65 BSC D2 1.45 1.60 1.70 E2 0.85 1.00 1.10 L 0.20 0.25 0.30 K 0.15 aaa 0.05 bbb 0.10 ccc 0.10 ddd 0.05 eee 0.
LDFM Package mechanical data Figure 32.
Package mechanical data LDFM Figure 33.
LDFM 9 Packaging mechanical data Packaging mechanical data Table 11. PPAK and DPAK tape and reel mechanical data Tape Reel mm mm Dim. Dim. Min. Max. A0 6.8 7 A B0 10.4 10.6 B 1.5 12.1 C 12.8 1.6 D 20.2 G 16.4 50 B1 Min. Max. 330 13.2 D 1.5 D1 1.5 E 1.65 1.85 N F 7.4 7.6 T K0 2.55 2.75 P0 3.9 4.1 Base qty. 2500 P1 7.9 8.1 Bulk qty. 2500 P2 1.9 2.1 R 40 T 0.25 0.35 W 15.7 16.3 DocID023585 Rev 2 18.4 22.
Packaging mechanical data LDFM Figure 34. Tape for PPAK and DPAK 10 pitches cumulative tolerance on tape +/- 0.2 mm T P0 Top cover tape P2 D E F B1 W K0 B0 For machine ref. only including draft and radii concentric around B0 A0 P1 D1 User direction of feed R Bending radius User direction of feed AM08852v1 Figure 35. Reel for PPAK and DPAK T REEL DIMENSIONS 40mm min. Access hole At slot location B D C N A Full radius Tape slot in core for tape start 25 mm min.
LDFM Packaging mechanical data Table 12. DFN6 (3 x 3 mm) tape and reel mechanical data mm Dim. Min. Typ. Max. A0 3.20 3.30 3.40 B0 3.20 3.30 3.40 K0 1 1.10 1.20 Figure 36.
Packaging mechanical data LDFM Figure 37.
LDFM Packaging mechanical data Table 13. DFN6 (2 x 2 mm) tape and reel mechanical data mm Dim. Min. Typ. A Max. 180 C 12.8 D 20.2 N 60 13.2 T 14.4 Ao 2.4 Bo 2.4 Ko 1.3 Po 4 P 4 Figure 38.
Order codes 10 LDFM Order codes Table 14. Device summary Order codes Packages LDFMPT-TR PPAK LDFMPUR DFN6-3x3 LDFMPVR DFN6-2x2 LDFM50DT-TR DPAK LDFM50PT-TR PPAK Output voltages Adjustable from 0.
LDFM Revision history 11 Revision history Table 15. Document revision history Date Revision 28-Aug-2012 1 Initial release. 2 Part numbers LDFM and LDFM50 have been unified under LDFM. Updated the Features and the Description in cover page. Cancelled Table1: Device summary. Updated Section 2: Pin configuration, Section 3: Typical application, Section 4: Absolute maximum ratings, Section 5: Electrical characteristics and Section 8: Package mechanical data.
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