data brief for further information contact your local stmicroelectronics sales office. september 2008 rev 1 1/4 4 STEVAL-ISA053V1 demonstration board for the pm6680 dual step-down controller with adjustable output voltage for notebook power system features constant on-time control allows very fast load transients 6 v to 28 v input voltage range 5 v auxiliary output voltage accurate current limit with sense resistor adjustable switching outputs lossless current sensing negative current limit soft-start internally fixed at 2.8 ms soft-end for output discharge 200 khz / 300 khz, 300 khz / 400 khz, 400 khz / 500 khz (5 v / 3 v selectable switching frequency) selectable pulse skip and no-audible skip modes at light loads independent power good signals description the pm6680 is a dual step-down controller with adjustable output voltages for notebook computer power systems. the STEVAL-ISA053V1 demonstration board is designed to test the performance of the pm6680 by employing a typical application circuit which allows testing of all pm6680 device functions. the board features two switching sections, with (typically) 1.5 v and 1.05 v outputs, from a 6 v to 28 v input battery voltage. the operating switching frequency of the two switching sections is 200 khz / 300 khz, respectively. each switch ing section delivers more than 5 a of output current. moreover, an internal linear regulator can provide 5 v @ 100 ma peak current. STEVAL-ISA053V1 www.st.com
circuit schematic STEVAL-ISA053V1 2/4 1 circuit schematic figure 1. schematic diagram ldo_fb l d o _ f b boot2 b o o t 2 boot1 b o o t 1 boot2 b o o t 2 boot1 b o o t 1 fb1 f b 1 fb1 f b 1 ldo_fb l d o _ f b pgnd p g n d pgnd p g n d vin v i n v5sw v 5 s w out5v o u t 5 v out5v o u t 5 v sgnd s g n d v+ v + v+ v + vin v i n sgnd s g n d sgnd s g n d v+ v + v+ v + sgnd s g n d sgnd s g n d sgnd s g n d sgnd s g n d sgnd s g n d pgnd p g n d pgnd p g n d sgnd s g n d v+ v + v+ v + v+ v + sgnd s g n d sgnd s g n d sgnd s g n d pgnd p g n d pgnd p g n d vin v i n sgnd s g n d out5v o u t 5 v v5sw v 5 s w pgnd p g n d sgnd s g n d sgnd s g n d pgnd p g n d pgnd p g n d pgnd p g n d sgnd s g n d sgnd s g n d sgnd s g n d v+ v + sgnd s g n d sgnd s g n d sgnd s g n d sgnd s g n d sgnd s g n d like 4-pin jumper l i k e 4 - p i n j u m p e r a - s12 closed a - s 1 2 c l o s e d b - s14 closed b - s 1 4 c l o s e d c - s12.1 to s14.2 c - s 1 2 . 1 t o s 1 4 . 2 m1 m 1 mosfet-n-so8 m o s f e t - n - s o 8 m1 m 1 mosfet-n-so8 m o s f e t - n - s o 8 4 5 1 6 7 8 2 3 c9 c 9 100n 1 0 0 n c9 c 9 100n 1 0 0 n c17 c 1 7 nm n m c17 c 1 7 nm n m j3 j 3 ldo5v+ l d o 5 v + j3 j 3 ldo5v+ l d o 5 v + c27 c 2 7 1uf 1 u f c27 c 2 7 1uf 1 u f j10 j 1 0 pgnd p g n d j10 j 1 0 pgnd p g n d 1 r 7 500r 5 0 0 r r 7 500r 5 0 0 r l1 l 1 3v3 3 v 3 l1 l 1 3v3 3 v 3 1 2 c4 c 4 15u 1 5 u c4 c 4 15u 1 5 u r25 r 2 5 1k 1 k r25 r 2 5 1k 1 k d2 d 2 sma s m a d2 d 2 sma s m a 1 2 r1 r 1 3 100k 1 0 0 k r1 r 1 3 100k 1 0 0 k r6 r 6 nm n m r6 r 6 nm n m j9 j 9 out2- o u t 2 - j9 j 9 out2- o u t 2 - 1 c19 c 1 9 100n 1 0 0 n c19 c 1 9 100n 1 0 0 n + c12 c 1 2 330uf 3 3 0 u f + c12 c 1 2 330uf 3 3 0 u f c13 c 1 3 nm n m c13 c 1 3 nm n m c24 c 2 4 100n 1 0 0 n c24 c 2 4 100n 1 0 0 n m2 m 2 mosfet-n-so8 m o s f e t - n - s o 8 m2 m 2 mosfet-n-so8 m o s f e t - n - s o 8 4 5 1 6 7 8 2 3 c20 c 2 0 1uf 1 u f c20 c 2 0 1uf 1 u f j6 j 6 pgood1 p g o o d 1 j6 j 6 pgood1 p g o o d 1 r31 r 3 1 ? r31 r 3 1 ? c5 c 5 100n 1 0 0 n c5 c 5 100n 1 0 0 n + cin c i n nm n m + cin c i n nm n m c22 c 2 2 220nf 2 2 0 n f c22 c 2 2 220nf 2 2 0 n f r27 r 2 7 ? r27 r 2 7 ? r4 r 4 nm n m r4 r 4 nm n m c3 c 3 15u 1 5 u c3 c 3 15u 1 5 u r29 r 2 9 ? r29 r 2 9 ? c15 c 1 5 150pf 1 5 0 p f c15 c 1 5 150pf 1 5 0 p f + c8 c 8 nm n m + c8 c 8 nm n m r32 r 3 2 ? r32 r 3 2 ? r10 r 1 0 10r 1 0 r r10 r 1 0 10r 1 0 r c1 c 1 15u 1 5 u c1 c 1 15u 1 5 u j7 j 7 pgood2 p g o o d 2 j7 j 7 pgood2 p g o o d 2 r33 r 3 3 ? r33 r 3 3 ? cref c r e f 100n 1 0 0 n cref c r e f 100n 1 0 0 n l2 l 2 5v 5 v l2 l 2 5v 5 v 1 2 s1 s 1 2 jp2so j p 2 s o s1 s 1 2 jp2so j p 2 s o 1 2 s10 s 1 0 jp4i j p 4 i s10 s 1 0 jp4i j p 4 i 2 4 3 1 + c26 c 2 6 4u7 4 u 7 + c26 c 2 6 4u7 4 u 7 r24 r 2 4 1k 1 k r24 r 2 4 1k 1 k r16 r 1 6 100k 1 0 0 k r16 r 1 6 100k 1 0 0 k c6 c 6 100n 1 0 0 n c6 c 6 100n 1 0 0 n r9 r 9 47r 4 7 r r9 r 9 47r 4 7 r j4 j 4 out1+ o u t 1 + j4 j 4 out1+ o u t 1 + 1 s1 s 1 jp3so j p 3 s o s1 s 1 jp3so j p 3 s o 1 3 2 r17 r 1 7 560k 5 6 0 k r17 r 1 7 560k 5 6 0 k c25 c 2 5 100n 1 0 0 n c25 c 2 5 100n 1 0 0 n c2 c 2 15u 1 5 u c2 c 2 15u 1 5 u c16 c 1 6 100pf 1 0 0 p f c16 c 1 6 100pf 1 0 0 p f r14 r 1 4 100k 1 0 0 k r14 r 1 4 100k 1 0 0 k c10 c 1 0 100n 1 0 0 n c10 c 1 0 100n 1 0 0 n + c21 c 2 1 4u7 4 u 7 + c21 c 2 1 4u7 4 u 7 rld5v r l d 5 v 100k 1 0 0 k rld5v r l d 5 v 100k 1 0 0 k d3 d 3 sma s m a d3 d 3 sma s m a 1 2 r28 r 2 8 ? r28 r 2 8 ? r30 r 3 0 ? r30 r 3 0 ? c14 c 1 4 nm n m c14 c 1 4 nm n m d1 d 1 bat54a/sot b a t 5 4 a / s o t d1 d 1 bat54a/sot b a t 5 4 a / s o t 3 2 1 r8 r 8 500r 5 0 0 r r8 r 8 500r 5 0 0 r + c11 c 1 1 330uf 3 3 0 u f + c11 c 1 1 330uf 3 3 0 u f s11 s 1 1 jp4i j p 4 i s11 s 1 1 jp4i j p 4 i 2 4 3 1 j2 j 2 -vin - v i n j2 j 2 -vin - v i n 1 r11 r 1 1 10r 1 0 r r11 r 1 1 10r 1 0 r m4 m 4 mosfet-n-so8 m o s f e t - n - s o 8 m4 m 4 mosfet-n-so8 m o s f e t - n - s o 8 4 5 1 6 7 8 2 3 r20 r 2 0 0r 0 r r20 r 2 0 0r 0 r s4 s 4 jp2so j p 2 s o s4 s 4 jp2so j p 2 s o 1 2 j8 j 8 out1- o u t 1 - j8 j 8 out1- o u t 1 - 1 r3 r 3 nm n m r3 r 3 nm n m s3 s 3 jp4i j p 4 i s3 s 3 jp4i j p 4 i 2 4 3 1 r22 r 2 2 0r 0 r r22 r 2 2 0r 0 r s1 s 1 3 jp2so j p 2 s o s1 s 1 3 jp2so j p 2 s o 1 2 r26 r 2 6 3r9 3 r 9 r26 r 2 6 3r9 3 r 9 r18 r 1 8 560k 5 6 0 k r18 r 1 8 560k 5 6 0 k s9 s 9 jp3so j p 3 s o s9 s 9 jp3so j p 3 s o 1 3 2 c18 c 1 8 nm n m c18 c 1 8 nm n m m3 m 3 mosfet-n-so8 m o s f e t - n - s o 8 m3 m 3 mosfet-n-so8 m o s f e t - n - s o 8 4 5 1 6 7 8 2 3 j11 j 1 1 ext5v e x t 5 v j11 j 1 1 ext5v e x t 5 v + c7 c 7 nm n m + c7 c 7 nm n m j5 j 5 +vin + v i n j5 j 5 +vin + v i n 1 s5 s 5 jp2so j p 2 s o s5 s 5 jp2so j p 2 s o 1 2 ldo_adj l d o _ a d j ldo_adj l d o _ a d j 1 + c28 c 2 8 4u7 4 u 7 + c28 c 2 8 4u7 4 u 7 s8 s 8 jp3so j p 3 s o s8 s 8 jp3so j p 3 s o 1 3 2 r23 r 2 3 0r 0 r r23 r 2 3 0r 0 r r19 r 1 9 560k 5 6 0 k r19 r 1 9 560k 5 6 0 k u1 u 1 pm6681_vfqfpn32 p m 6 6 8 1 _ v f q f p n 3 2 u1 u 1 pm6681_vfqfpn32 p m 6 6 8 1 _ v f q f p n 3 2 boot1 b o o t 1 23 2 3 hgate1 h g a t e 1 22 2 2 phase1 p h a s e 1 21 2 1 csense1 c s e n s e 1 20 2 0 v5sw v 5 s w 17 1 7 out1 o u t 1 29 2 9 comp1 c o m p 1 30 3 0 e n 1 2 5 ldo_fb l d o _ f b 16 1 6 lgate1 l g a t e 1 15 1 5 pgood1 p g o o d 1 26 2 6 pgood2 p g o o d 2 27 2 7 shdn s h d n 5 e n 2 4 v r e f 3 2 ski s k i p 2 4 fse f s e l 3 v c c 3 1 ldo l d o 5 1 8 v i n 1 9 boot2 b o o t 2 9 hgate2 h g a t e 2 10 1 0 phase2 p h a s e 2 11 1 1 csense2 c s e n s e 2 12 1 2 pgnd p g n d 14 1 4 sgnd s g n d 1 out2 o u t 2 8 comp2 c o m p 2 2 fb2 f b 2 6 fb1 f b 1 28 2 8 ldo l d o 7 lgate2 l g a t e 2 13 1 3 c23 c 2 3 10pf 1 0 p f c23 c 2 3 10pf 1 0 p f r5 r 5 nm n m r5 r 5 nm n m r15 r 1 5 100k 1 0 0 k r15 r 1 5 100k 1 0 0 k r2 r 2 1 0r 0 r r2 r 2 1 0r 0 r s2 s 2 swdip-4 s w d i p - 4 s2 s 2 swdip-4 s w d i p - 4 1 2 3 4 8 7 6 5 j1 j 1 out2+ o u t 2 + j1 j 1 out2+ o u t 2 + 1 r1 r 1 2 100k 1 0 0 k r1 r 1 2 100k 1 0 0 k
STEVAL-ISA053V1 revision history 3/4 2 revision history table 1. document revision history date revision changes 29-sep-2008 1 initial release.
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