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1 Up to 5A ULDO linear regulator General features.5v,.8v,.5v and.v fixed output voltage V to 4V input voltage range 00mΩ R DS(on) t J = 5 C 0.6V max. drop-out at A Excellent load regulation 0.6mA quiescent current at any load Short circuit protection Thermal shutdown Applications Mother boards Processor I/O & supplies Low voltage memory & chip set supplies Graphic & sound cards Low voltage logic supplies Post regulator for SMPS Order codes Part number Description D PAK The L4957AD devices are Ultra Low Drop Output linear regulators with an internal N-channel MOSFET of 00mΩ particulary suitable for low voltage/low dropout applications. Operating with a input voltage from V to 4V 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.v (rail bus) or to.5v with high current rating. Fast response transient minimise the output capacitor value. A minimum of µf assures the stability in all load conditions. The on-chip trimming technique offers a tighter voltage reference tolerance (with ± % 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. Tube L4957AD.5 L4957AD.8 L4957AD.5 L4957AD. Tape and Reel L4957AD.5TR L4957AD.8TR L4957AD.5TR L4957AD.TR April 006 Rev 6 /

2 Contents L4957A Contents Block diagram and typical application Pin description Pin connection Pin description Maximum ratings Absolute maximum ratings Thermal data Electrical characteristics Package mechanical data Revision history /

3 Block diagram and typical application Block diagram and typical application Figure. Block diagram V IN 0µF IN V REF CURRENT LIMIT CHARGE PUMP Figure. PRE REGULATOR Typical application V to 4V C IN + - BUFFER POWER DMOS 00mΩ THERMAL OUT SHUTDOWN R X L4957AD GND OUT GND R Y D00IN07B V OUT C D00IN08A V OUT µf /

4 Pin description L4957A Pin description. Pin connection Figure. Pin connection (top view) OUT GND IN D98IN9A. Pin description Table. Pin description D PAK Name Pin N Description IN Unregulated input voltage; this pin must be bypassed with a capacitor larger than 0µF. GND To connect to Ground to get.5v,.8v,.5v or.v output. OUT Regulated output voltage. A minimum bypass capacitor of µf is required to insure stability. 4/

5 Maximum ratings Maximum ratings. Absolute maximum ratings Table. Absolute maximum ratings Symbol Parameter Value Unit V IN Supply input voltage 6 V T J Junction temperature -40 to +50 C T STG Storage temperature -40 to +50 C. Thermal data Table. Thermal data Symbol Parameter Value Unit R thjc Maximum thermal resistance junction-case C/W R thja Maximum thermal resistance junction-ambient 60 C/W Thermal Shutdown Typ. 50 C Thermal Hysteresis Typ. 9 C 5/

6 Electrical characteristics L4957A 4 Electrical characteristics Table 4. Electrical Characteristcs (T J = 5 C, V IN = 5V, unless otherwise specified) Symbol Parameter Test condition Min Typ Max Unit V IN Operating Supply Voltage 4 V V O Output Voltage.5V < V IN < 5.5V; I O = 0.A V V IN =.V ±5%; 0.A < I O < 5A () V IN =.V ±5% I O = 0.A V IN = 5V ±5% V V. Specifications referred to T J from 0 C to +5 C. V IN =.V ±5% (0.A < I O < 4.5A) () V IN = 5V ±5% 0.A < I O < 5A V IN =.V ±5% I O = 0.A V IN = 5V ±5% V IN =.V ±5% (0.A < I O <.A) () V IN = 5V ±5% 0.A < I O < 5A V V V V IN = 5V ±5% I O = 0.A.67.. V V IN = 5V ±5% 0.A < I O < 5A () V R DS(on) Drain-Source ON Resistance () 00 mω I O Current Limiting () A I Q Quiescent Current V < V IN < 4V () 0.6 ma Ripple Rejection f = 0Hz, I O = A V IN = 5V V IN = V PP db 6/

7 Electrical characteristics Figure 4. Line regulation vs. junction temperature Figure 5. Load regulation Output Voltage Deviation [mv] Figure 6. V < Vin < 6.5V Iout = 0mA Tj [ C ] Maximum output current vs. junction temperature O utput Current [A] (Vin-Vout) > V pin = GND Tj [ C ] *Pulsed tecnique has been used Iou t [A ] Figure 7. DC operating area Output Voltage Deviation [mv] O utput Current [A] Vin>.8V Tj=5 C Rdson lim it Vin = 5V Tj = 5 C (Pulsed technique has been used) Vout =.5V Cu rre nt Lim ita tio n DC O perating Area Pow er Dissipation Lim it Tc=70 C Pdmax= W Tc=5 C Pdmax=40 W (Vin - Vout) [V] 7/

8 Electrical characteristics L4957A Figure 8. Ripple rejection vs. frequency Figure 9. Output voltage vs. output current (V OUT =.5V) Ripple Rejection [db] Vripple=Vp-p 80 Vripple=0.5Vp-p V OUT (V) D00IN Cin=uF Cout=uF Vout=.5V Vinmin=V Iout=5A k 0k 00k Frequency [Hz] Figure 0. Maximum output current vs. junction temperature Io [A ] Tj = 5 C Tj = 5 C Tj = 00 C m axim um R on lim its V = Vin - Vo 6. IOUT(A) 8/

9 Package mechanical data 5 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: 9/

10 Package mechanical data L4957A Table 5. D PAK Mechanical data Dim. mm. inch Min Typ Max Min Typ Max A A A B B C C D E G L L L R V Figure. Package dimensions 0/

11 Revision history 6 Revision history Table 6. Revision history Date Revision Changes -Feb-00 5 Removed the L4957AV part number and its references in the whole document 0-Apr New template /

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LM323. Three-terminal 3 A adjustable voltage regulators. Features. Description

LM323. Three-terminal 3 A adjustable voltage regulators. Features. Description Three-terminal 3 A adjustable voltage regulators Features Output current: 3 A Internal current and thermal limiting Typical output impedance: 0.01 W Minimum input voltage: 7.5 V Power dissipation: 30 W