L4957A Up to 5A ULDO linear regulator General features ■ 1.5V, 1.8V, 2.5V and 3.3V fixed output voltage ■ 3V to 14V input voltage range ■ 200mΩ RDS(on) typical @ tJ = 125°C ■ 0.6V max. drop-out at 2A ■ Excellent load regulation ■ 0.6mA quiescent current at any load ■ Short circuit protection ■ Thermal shutdown 3 1 D2PAK Description The L4957AD devices are Ultra Low Drop Output linear regulators with an internal N-channel MOSFET of 200mΩ particulary suitable for low voltage/low dropout applications. Applications ■ Mother boards ■ Processor I/O & supplies ■ Low voltage memory & chip set supplies ■ Graphic & sound cards ■ Low voltage logic supplies ■ Post regulator for SMPS Operating with a input voltage from 3V to 14V they are capable to deliver up to 5A. The devices are ideal for use as one of the suppliesrequired by processor, for example they are the cost effective and efficient solution for conversion from 3.3V (rail bus) to 2.5V @ 2.5A or to 1.5V with high current rating. Fast response transient minimise the output capacitor value. A minimum of 22µF assures the stability in all load conditions. The on-chip trimming technique offers a tighter voltage reference tolerance (with ± 2% including line and load variation) beside to ensure a controlled short circuit current. Thermal shutdown provides protection against overload conditions that creates excessive junction temperature. Order codes Part number April 2006 Tube Tape and Reel L4957AD1.5 L4957AD1.5TR L4957AD1.8 L4957AD1.8TR L4957AD2.5 L4957AD2.5TR L4957AD3.3 L4957AD3.3TR Rev 6 1/12 www.st.com 12 Contents L4957A Contents 1 Block diagram and typical application . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 L4957A 1 Block diagram and typical application Block diagram and typical application Figure 1. VIN 10µF Block diagram IN 1 + PRE REGULATOR CHARGE PUMP CURRENT LIMIT VREF - BUFFER E/A POWER DMOS 200mΩ OUT THERMAL SHUTDOWN RX 3 VOUT 22µF RY 2 GND D00IN1108A Figure 2. Typical application 3V to 14V IN 3 1 VOUT OUT L4957AD C1 C2 2 GND D00IN1107B 3/12 Pin description L4957A 2 Pin description 2.1 Pin connection Figure 3. Pin connection (top view) OUT 3 GND 2 1 IN D98IN933A D2PAK 2.2 Pin description Table 1. Pin description 4/12 Name Pin N° Description 1 IN 2 GND To connect to Ground to get 1.5V, 1.8V, 2.5V or 3.3V output. 3 OUT Regulated output voltage. A minimum bypass capacitor of 22µF is required to insure stability. Unregulated input voltage; this pin must be bypassed with a capacitor larger than 10µF. L4957A Maximum ratings 3 Maximum ratings 3.1 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol 3.2 Parameter Value Unit VIN Supply input voltage 16 V TJ Junction temperature -40 to +150 °C TSTG Storage temperature -40 to +150 °C Thermal data Table 3. Thermal data Symbol Parameter Value Unit RthJC Maximum thermal resistance junction-case 3 °C/W RthJA Maximum thermal resistance junction-ambient 60 °C/W Thermal Shutdown Typ. 150 °C Thermal Hysteresis Typ. 29 °C 5/12 Electrical characteristics 4 L4957A Electrical characteristics Table 4. Electrical Characteristcs (TJ = 25°C, VIN = 5V, unless otherwise specified) Symbol Parameter VIN Operating Supply Voltage VO Output Voltage Test condition Max Unit 14 V 3.15V < VIN < 5.25V; IO = 0.1A 1.485 1.5 1.515 V VIN = 3.3V ±5%; 0.1A < IO < 5A (1) 1.47 1.5 1.53 V VIN = 3.3V ±5% IO = 0.1A VIN = 5V ±5% 1.782 1.8 1.818 V VIN = 3.3V ±5% (0.1A < IO< 4.5A) (1) VIN = 5V ±5% 0.1A < IO< 5A 1.764 1.8 1.836 V VIN = 3.3V ±5% IO = 0.1A VIN = 5V ±5% 2.475 2.5 2.525 V VIN = 3.3V ±5% (0.1A < IO< 2.2A) (1) VIN = 5V ±5% 0.1A < IO< 5A 2.45 2.5 2.55 V VIN = 5V ±5% IO = 0.1A 3.267 3.3 3.333 V VIN = 5V ±5% 0.1A < IO< 5A (1) 3.234 3.3 3.366 V 300 mΩ 6.3 7.5 A 0.6 2 mA (1) IO Current Limiting (1) IQ Quiescent Current 3V < VIN< 14V (1) Ripple Rejection f = 120Hz, IO = 1A VIN = 5V ∆VIN = 2V PP 1. Specifications referred to TJ from 0°C to +125°C. 6/12 Typ 3 Drain-Source ON Resistance RDS(on) Min 5.1 60 75 dB L4957A Electrical characteristics Line regulation vs. junction temperature O u tp u t V o lta g e D e v ia tio n [m V ] 5 4 .5 3 V < V in < 6 .5 V Io u t = 1 0 m A 4 3 .5 3 2 .5 2 Figure 5. O u tp u t V o lta g e D e v ia tio n [m V ] Figure 4. Load regulation 5 4 V in = 5 V T j = 2 5 °C ( P u ls e d te c h n iq u e h a s b e e n u s e d ) 3 V o u t = 1 .5 V 2 1 0 -1 1 .5 -2 1 -3 0 .5 -4 0 -4 0 -2 0 Figure 6. 0 20 40 -5 60 80 100 120 140 160 T j [° C ] Maximum output current vs. junction temperature O u tp u t C u rre n t [A ] 10 9 0 1 2 3 Figure 7. 5 DC operating area O u tp u t C u r re n t [A ] 8 V in > 2 .8 V T j= 1 2 5 ° C 7 T c =2 5 ° C P d m a x= 40 W C u rre n t L im ita tio n 8 7 6 6 5 P o w e r D issip a tio n L im it R d son lim it 5 4 T c= 7 0°C P dm a x= 22 W 4 3 4 Io u t [A ] (V in -V o u t) > 2 V p in 2 = G N D 3 D C O p e ra tin g A re a 2 2 1 1 0 -4 0 -2 0 0 20 40 60 80 100 120 140 160 T j [° C ] * P u ls e d te c n iq u e h a s b e e n u s e d 0 0 1 2 3 4 5 (V in - V o u t) [V ] 6 7 8 7/12 Electrical characteristics Figure 8. L4957A Ripple rejection vs. frequency Figure 9. R ip p le R e je c tio n [d B ] VOUT (V) 100 90 V rip p le = 3 V p - p Output voltage vs. output current (VOUT = 1.5V) D00IN1109 V r ip p le = 0 .5 V p -p 80 70 60 50 40 C in = 2 2 u F C o u t= 2 2 u F V o u t= 1 .5 V V in m in = 3 V Io u t= 5 A 30 20 10 0 10 100 1k F re q u e n c y [ H z ] 10k 10 0 k Figure 10. Maximum output current vs. junction temperature Io [A ] 5 4 .5 T j = 2 5 °C 4 Tj = 125°C 3 .5 Tj = 100°C 3 2 .5 2 1 .5 1 m a x im u m R o n lim its 0 .5 0 8/12 0 0 .2 0 .4 0 .6 0 .8 1 1 .2 1 .4 1 .6 1 .8 2 ∆ V = V in - V o 6.3 IOUT(A) L4957A 5 Package mechanical data 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 9/12 Package mechanical data L4957A Table 5. D 2PAK Mechanical data mm. inch Dim. Min Typ Min Typ Max A 4.30 4.60 0.169 0.181 A1 2.49 2.69 0.098 0.106 A2 0.03 0.23 0.001 0.009 B 0.70 0.93 0.027 0.037 B2 1.25 C 0.45 0.60 0.017 0.024 C2 1.21 1.36 0.047 0.054 D 8.95 9.35 0.352 0.368 E 10.00 10.28 0.393 0.405 G 4.88 5.28 0.192 0.208 L 15.00 15.85 0.590 0.624 L2 1.27 1.40 0.050 0.055 L3 1.40 1.75 0.055 0.069 R V2 1.40 0.049 0.40 0° Figure 11. Package dimensions 10/12 Max 0.055 0.016 8° 0° 8° L4957A 6 Revision history Revision history Table 6. Revision history Date Revision Changes 12-Feb-2002 5 Removed the L4957AV part number and its references in the whole document 20-Apr-2006 6 New template 11/12 L4957A Please Read Carefully: Information in this document is provided solely in connection with ST products. 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