LM2651 LM2651 1.5A High Efficiency Synchronous Switching Regulator Literature Number: JAJS632
LM2651 1.5A 1.5A High Efficiency Switching Regulator 2651 LM Dongyan Zhou 19980610 LM2651 100:1 (1.5A 15mA) LM2651 97 LM2651 (" " ) 15mA 80 LM2651 10 A LM2651 DC/DC LM2651 300kHz 24060 DS100925 2005 4 Converted to nat2000 DTD composed with NAT2000. deleted graph efficiency vs load current and added sleep mode threshold vs output voltage for the ADJ version and updated decription of pin 8. forgot to change LM2653 to Lm2651. SN accidentally deleted curve no. 14.SN revised typical curve numbers 11 and 14 and added another paragarph from app note 1147 to External Schottky Diode division of the document. per I.N. SN finaql number edits from Skippy. SN updated image number 1 in quikedit with spec changes in the electrical tables. SN composed after image fix for figure 1. SN added the ordering table and few other formatting edits. SN Enter db.side.title. CN composed after fixing a few typos. SN sent to be composed once the art is loaded. SN forgot to include one of the tables. SN heavy text and art edits based on the LM2653 by Dongyan. SN fixed links to Fig.1 & 2, changed scale on front page image. Added ADJ specs & reference on front page. Updated Note 2. WG composed by adding the 16 lead package drawing. SN composed after image load. SN changed package from SO8 to MTC16. modified Pin Desc table specs. WG composed after image load. sn edits per DYZ, added SO8 drawing & spots for Test Ckts (Fig 1 & 2). wg composed the same. art 1and 2 already pointed. SN composed with the revised art for 01. SN 97 ma 14V 2.5V 3.3V ADJ R DS(on) MOSFET A TSSOP 5V LM2651 LM2651 1.5A Efficiency vs Load Current (V IN 5V, V OUT 3.3V) 20010327 National Semiconductor Corporation DS100925-07-JP 1
LM2651 16-Lead TSSOP (MTC) 1, 2 SW MOSFET 3-5 VIN 6 VCB 7 AVIN 8 SD(SS) 0.3V 9 FB ( ) 10 COMP 11 NC 12-13 AGND 14-16 PGND www.national.com/jpn/ 2
(Note 1) (T A 25 ) (Note 2) 15V 0.4V V FB 5V 893 mw 40 T J 125 ESD (Note 3) (Note 1) 65 150 1kV LM2651 4V V IN 14V LM2651-1.8 System Parameters T J 25 V IN 10V LM2651-2.5 System Parameters LM2651-3.3 System Parameters 3 www.national.com/jpn/
LM2651 LM2651-ADJ System Parameters ( V OUT 2.5V ) T J 25 V IN 10V www.national.com/jpn/ 4
( ) T J 25 V IN 10V LM2651 Note 1: Note 2: Note 3: Note 4: Note 5: P Dmax (T Jmax T A )/ JA T Jmax T A JA - 893mW T Jmax T A JA 150 25 140 /W JA 140 /W 16 TSSOP 25 1 7.14mW LM2651 165 100pF 1.5k Typ ( ) Limit ( ) ( ) ( ) 100 (SQC) (AOQL) 5 www.national.com/jpn/
LM2651 I Q vs Input Voltage I QSD vs Input Voltage I QSD vs Junction Temperature Frequency vs Junction Temperature R DS(ON) vs Input Voltage R DS(ON) vs Junction Temperature www.national.com/jpn/ 6
( ) Current Limit vs Input Voltage (V OUT 2.5V) Current Limit vs Junction Temperature (V OUT 2.5V) LM2651 Current Limit vs Junction Temperature (V OUT 3.3V) Current Limit vs Input Voltage (V OUT 3.3V) Sleep Mode Threshold vs Output Voltage For ADJ version (V IN 5V) 7 www.national.com/jpn/
LM2651 FIGURE 1. LM2651 Block Diagram LM2651(300kHz) PWM PWM (COMP ) COMP 40ns ( ) LM2651 HIGH LOW PWM HIGH LOW MOSFET 2A MOSFET ESR www.national.com/jpn/ 8
( ) (I OUT /2) V IN 2V OUT 25 2 (0.1 F) SD (SS) ( 2 A) SD (SS) 0.6V ( ) 2 A 10 A SD (SS) 0.6V 1.3V 0V SD (SS) 1.3V PWM SD (SS) 2V T SS C SS 0.6V/2 A C SS (2V 0.6V)/10 A LM2651 DC 30 2 C OUT PWM ESR ESR ( PL OS-CON Sprague 593D 594D AVX TPS CDE ) 25 ESR ESR PWM V RIPPLE 20mV V OUT /V FB 0.1 F 6.7V(typ) R 1 R 2 ( ) V OUT V REF (1 R 1 /R 2 ) V REF 1.238V 10k100k (R 1 R 2 1 ) F p1 1/ (2 R OUT C OUT ) ESR F z1 1/(2 ESRC OUT ) 45kHz 150kHz F p2 F p2 F s /( n(1 D)) D V OUT /V IN n 1 0.348L/(V IN V OUT ) (L H V IN V OUT V ) G 500/I OUT I OUT LM2651 Gm Gm R o 80kC c1 R C R o F pc1 1/(2 C c1 (R o R c )), F zc1 1/2 C c1 R c. ESR F z1 F p2 ESR C c2 F pc2 1/(2 C c2 R o R c ) (G 1) 45 C OUT 68 F C c1 2.2nF R c 15kESR zero F p2 C c2 R C 10k 9 www.national.com/jpn/
LM2651 ( ) PWM MOSFET MOSFET D 1 MOSFET MOSFET 1 2 D 1 25 D 1 D 1 30D 1 MOSFET D 1 MOSFET MOSFET D2 D2 V OUT D2 2A PCB 1. V IN PGND MOSFET 2. FB ( ) 3. D 1 D 1 SW PGND Schematic for the Typical Board Layout www.national.com/jpn/ 10
inches (millimeters) 16-Lead TSSOP (MTC) For ordering, refer to Ordering Information Table See NS Package Number MTC16 LM2651 1.5A (CEO) (GENERAL COUNSEL) a (b) National Semiconductor Copyright 2005 National Semiconductor Corporation www.national.com 135-0042 2-17-16 / TEL.(03)5639-7300 www.national.com/jpn/
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