L4957A UP TO 5A ULDO LINEAR REGULATOR PRODUCT PREVIEW 1.5V, 1.8V, 2.5V AND 3.3V FIXED OUTPUT VOLTAGE 3V TO 14V INPUT VOLTAGE RANGE 200mΩ Rdson 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 MULTIPOWER BCD TECHNOLOGY 3 1 D2PAK Versawatt TO-220 ORDERING NUMBERS: APPLICATIONS L4957AV1.5 L4957AV1.8 L4957AV2.5 L4957AV3.3 MOTHER BOARDS PROCESSOR I/O & SUPPLIES LOW VOLTAGE MEMORY & CHIP SET SUPPLIES GRAPHIC & SOUND CARDS LOW VOLTAGE LOGIC SUPPLIES POST REGULATOR FOR SMPS L4957AD1.5 L4957AD1.8 L4957AD2.5 L4957AD3.3 plies required 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. DESCRIPTION The L4957A devices are Ultra Low Drop Output linear regulators with an internal N-channel MOS of 200mΩ particulary suitable for low voltage/low dropout applications. 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 sup- TYPICAL APPLICATION 3V to 14V IN 1 3 VOUT OUT L4957A C1 C2 2 GND D00IN1107A May 2000 This is preliminary information on a new product now in development. Details are subject to change without notice. 1/7 L4957A ABSOLUTE MAXIMUM RATINGS Symbol Value Unit VIN Supply Input Voltage Parameter 16 V Ti Junction Temperature -40 to +150 °C Tstg Storage Temperature -40 to +150 °C PINS CONNECTION 3 3 OUT 2 GND 2 1 IN 1 OUT GND IN D98IN838B D98IN933A Versawatt (TO220) D2PAK BLOCK DIAGRAM IN VIN 1 10µF PRE REGULATOR CHARGE PUMP CURRENT LIMIT VREF + - E/A BUFFER POWER DMOS 200mΩ OUT THERMAL SHUTDOWN RX 3 RY 2 GND D00IN1108A PIN FUNCTIONS Pin N° Name 2/7 VOUT 22µF Function 1 IN Unregulated input voltage; this pin must be bypassed with a capacitor larger than 10µF. 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. L4957A THERMAL DATA Symbol Parameter TO220 D2PAK Unit Max. 2.5 3 °C/W Thermal Resistance Junction-ambient Max. 50 60 °C/W Thermal Shutdown Typ. 150 °C Thermal Hysteresis Typ. 20 °C Rth j-case Thermal Resistance Junction-case Rth j-amb ELECTRICAL CHARACTERISTICS (Tj = 25°C, VIN = 5V, unless otherwise specified). • = Specifications referred to TJ from 0°C to +125°C. Symbol Parameter VIN Operating Supply Voltage Test Condition VO Output Voltage Min. 3.15V < VIN < 5.25V; IO = 0.1A VIN = 3.3V ±5%; 0.1A < IO < 5A VIN = 3.3V ±5% VIN = 5V ±5% VIN = 3.3V ±5% VIN = 5V ±5% VIN = 5V ±5% IO = 0.1A VIN = 5V ±5% 0.1A < IO < 5A Drain-Source ON Resistance Current Limiting Quiescent Current 3V < VIN < 14V Ripple Rejection f = 120Hz, IO = 1A VIN = 5V ∆VIN = 2VPP 3V < Vin < 6.5V Iout = 10mA 4 3.5 3 2.5 1.5 Unit 14 V 1.515 V 1.47 1.5 1.53 V 1.782 1.8 1.818 V 1.764 1.8 1.836 V 2.475 2.5 2.525 V 2.45 2.5 2.55 V 3.267 3.3 3.333 V 3.234 3.3 3.366 V 300 mΩ 5.1 60 6.3 7.5 A 0.6 2 mA 75 dB 5 4 Vin = 5V Tj = 25 °C (Pulsed technique has been used) 3 Vout = 1.5V 2 1 0 -1 2 -2 1.5 -3 1 -4 0.5 0 -40 • • 1.485 Max. Figure 2: Load Regulation Output Voltage Deviation [mV] Output Voltage Deviation [mV] 4.5 • • • IO IQ 5 • IO = 0.1A VIN = 3.3V ±5% (0.1A < IO < 2.2A) VIN = 5V ±5% 0.1A < IO < 5A Figure 1: Line Regulation vs. Junction Temperature • IO = 0.1A VIN = 3.3V ±5% (0.1A < IO < 45A) VIN = 5V ±5% 0.1A < IO < 5A R DSON Typ. 3 -5 -20 0 20 40 60 80 Tj [°C] 100 120 140 160 0 1 2 3 4 5 Iout [A] 3/7 L4957A Figure 3: Maximum Output Current vs. Junction Temperature Figure 4: DC Operating Area O utput C urrent [A] 10 O u t p u t C ur r en t [ A ] 8 9 Vin >2.8 V Tj=1 25 C 7 7 6 6 5 5 4 4 2 2 1 1 0 20 40 Tc = 7 0°C P d m a x = 22 W D C O p e rating A r ea pin 2 = G ND 0 -40 -20 P o w e r D is s ip ation L im it R dso n lim it 3 (Vin-Vout) > 2V 3 60 80 100 120 140 160 Tj [°C] 0 0 *P ulsed te cniq ue h as been used Figure 5: Ripple Rejection vs. Frequency 1 2 3 4 5 ( V in - Vou t ) [ V ] 6 7 8 Figure 6: Output Voltage vs. Output Current. (VOUT = 1.5V) R ip p le R e j e c t i o n [ d B ] VOUT (V) 1 00 90 Tc =2 5 °C P d m a x = 40 W C ur re n t L im ita tio n 8 D00IN1109 V r ip p l e = 3 V p -p 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 ut= 5 A 30 20 10 0 10 1 00 1k F re q u e n c y [H z ] 10 k 1 00k Figure 7: Maximum Output Current vs. Drop-Out Voltage Io [A ] 5 4 .5 T j = 2 5 °C 4 T j = 1 2 5 °C 3 .5 T j = 1 0 0 °C 3 2 .5 2 1 .5 1 m a x im u m R o n lim its 0 .5 0 4/7 0 0 .2 0 .4 0 .6 0 .8 1 1 .2 1 .4 1 .6 1 .8 2 ∆ V = V in - Vo 6.3 IOUT(A) L4957A mm MIN. TYP. inch MAX. MIN. TYP. MAX. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.40 2.70 0.094 0.106 H2 10.0 10.4 0.393 0.409 L2 L4 16.4 13.0 0.645 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.25 15.75 0.600 0.620 L7 6.20 6.60 0.244 0.260 L9 3.50 3.93 0.137 0.154 M Dia 2.6 3.75 OUTLINE AND MECHANICAL DATA 0.102 3.85 0.147 Versawatt (TO220) 0.151 M DIM. TO220MEC 5/7 L4957A DIMENSIONS REF. Millimeters OUTLINE AND MECHANICAL DATA Inches Min. Typ. Max. 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 1.40 0.049 0.055 0.40 V2 0° D2PAK 0.016 8° 0° 8° A E C2 L2 16.90 D L L3 10.30 A1 5.08 1.30 B2 B R C 3.70 8.90 G A2 2.0 MIN. FLAT ZONE V2 6/7 L4957A Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. 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