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general description the max1567 step-up main evaluation kit (ev kit) is a fully assembled and tested circuit that accepts input voltages of 1.5v to 3.2v and provides all the output volt- ages required for a typical digital still camera. the out- puts consist of the main step-up output (3.3v), a step- down output (1.8v), a general-purpose 5v output, out- puts for driving white led backlighting, and outputs for charge-coupled device (ccd) and lcd bias. the ev kit comes with the max1567 installed, but can also be used to evaluate the max1566. for applications with a higher battery voltage, such as li+ battery applications, another version of the ev kit is available with the main output configured as a step-down converter (max1567evkit). features up to 95% efficient 1.5v to 3.2v input voltage range main step-up output, 3.3v step-down output, 1.8v 5v general-purpose output ccd and lcd bias outputs (+15v/-7.5v) current-regulated output with overvoltage protection for white led backlighting 1a shutdown mode fully assembled and tested evaluates: max1566/max1567 max1567 step-up main evaluation kit ________________________________________________________________ maxim integrated products 1 19-3236; rev 0; 3/04 component list for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information part temp range ic package MAX1567SUMEVKIT 0 c to +70 c 40 thin qfn 6mm x 6mm designation qty description c1, c18 2 1? 10%, 25v x7r ceramic capacitors (1206) tdk c3216x7r1e105k or equivalent c2 1 0.1? 10%, 16v x7r ceramic capacitor (0603) tdk c1608x7r1c104k or equivalent c3 1 100pf 5%, 50v c0g ceramic capacitor (0603) tdk c1608c0g1h101j or equivalent c4 1 0.01? 10%, 16v x7r ceramic capacitor (0402) tdk c1005x7r1e103k or equivalent c5, c9 2 4700pf 10%, 25v x7r ceramic capacitors (0402) taiyo yuden tmk105b472kw or equivalent c6 1 6800pf 10%, 25v x7r ceramic capacitor (0402) taiyo yuden tmk105b682kw or equivalent designation qty description c7 1 3300pf 10%, 50v x7r ceramic capacitor (0402) taiyo yuden umk105bj332kw or equivalent c8 1 2200pf 10%, 50v x7r ceramic capacitor (0402) taiyo yuden umk105bj222kw or equivalent c10, c14, c21 3 47? 20%, 6.3v x5r ceramic capacitors (1812) taiyo yuden jmk432bj476mm or equivalent c11, c13 0 not installed (0805) c12, c15, c16 3 10? 20%, 6.3v x5r ceramic capacitors (0805) taiyo yuden jmk212bj106mg or equivalent c17 1 1? 10%, 25v x7r ceramic capacitor (0805) tdk c2012x7r1e105k or equivalent c19 0 not installed (0805) c20 0 not installed (1206)
evaluates: max1566/max1567 max1567 step-up main evaluation kit 2 _______________________________________________________________________________________ component list (continued) designation qty description d1, d7, d10 3 schottky diodes 20v, 500ma (sod-123) central cmhsh5-2l d2?5 4 white leds nichia nscw215t d6 1 schottky diode 40v, 500ma (sod-123) central cmhsh5-4 d8, d9 0 not installed (sod-123) d11 1 schottky diode 1a, 30v (sma) nihon ec10qs03 ju1?u6 6 3-pin headers ju8, ju9, ju11, ju13 0 not installed cut here?hort ju7, ju10, ju12 0 not installed cut here?pen l1 1 1.5? inductor sumida cdrh3d16-1r5 l2 1 1.5? inductor toko a921cy-1r5m l3 1 22? inductor toko a921cy-220m l4 1 10? inductor sumida cdrh8d28-100 l5 1 3.0? inductor sumida cdrh5d28-3r0 l6 1 10? inductor sumida cdrh5d28-100 l7 0 not installed n1, n2 2 n-channel mosfets (sot23) fairchild fdn337n n3 0 not installed (sot23) p1 1 p-channel mosfet (sot23) fairchild fdn360p r1 1 1m ? 5% resistor (0603) r2, r12, r14, r16, r18, r20 6 90.9k ? 1% resistors (0603) designation qty description r3 1 10 ? 5% resistor (0603) r4 1 51k ? 5% resistor (0603) r5 1 68k ? 5% resistor (0603) r6 1 47k ? 5% resistor (0603) r7 1 33k ? 5% resistor (0603) r8, r9 2 100k ? 5% resistors (0603) r10 1 8.2k ? 5% resistor (0603) r11 1 1m ? 1% resistor (0603) r13 1 549k ? 1% resistor (0603) r15 1 274k ? 1% resistor (0603) r17 1 150k ? 1% resistor (0603) r19 1 40.2k ? 1% resistor (0603) r21, r22, r23 3 100k ? 5% resistors (0603) r24 r29 0 not installed (1206) r30, r31 0 not installed (0603) t1 0 transformer (not installed) u1 1 max1567etl (40-lead thin qfn) none 6 shunts none 1 max1567 ev kit pc board note: please indicate you are using the max1566/max1567 when contacting these component suppliers. component suppliers supplier phone website central semiconductor 631-435-1110 www.centralsemi.com fairchild semiconductor 408-721-2181 www.fairchildsemi.com international rectifier 310-322-3331 www.irf.com kamaya 260-489-1533 www.kamaya.com murata 814-237-1431 www.murata.com panasonic 714-373-7939 www.panasonic.com sumida 847-956-0666 www.sumida.com taiyo yuden 408-573-4150 www.t-yuden.com tdk 847-803-6100 www.component.tdk.com toko 847-297-0070 www.toko.com vishay 402-563-6866 www.vishay.com
evaluates: max1566/max1567 max1567 step-up main evaluation kit _______________________________________________________________________________________ 3 quick start recommended equipment power supply capable of supplying 1.5v to 3.2v at 5a voltmeter load resistors or electronic loads procedure follow the steps below to verify operation of the max1567 ev kit: 1) preset the power supply to 1.5v to 3.2v. 2) turn off the power supply. do not turn on the power supply until all connections are completed. 3) connect the power-supply positive lead to the pad on the ev kit board labeled batt. 4) connect the power-supply ground lead to the pad on the ev kit board labeled gnd. 5) connect loads from outputs vm, vsd, out1a, and out2 to gnd. see table 1 for maximum load cur- rents. 6) verify that the ev kit jumper ju1 has pins 2-3 shorted (to enable 5v step up). 7) verify that jumpers ju2 ju6 have pins 1-2 shorted (to disable all other outputs). 8) turn on the power supply. 9) verify the vsu voltage is 5v using a voltmeter. 10) if desired, connect a load from vsu to gnd. 11) to verify other outputs, move jumpers ju2 ju6 to short pins 2 and 3 to enable corresponding out- put, and verify the voltages with a voltmeter (see table 1). detailed description step-up output (vsu) the main step-up output (vsu) powers the internal cir- cuitry of the max1567 and must reach its regulation voltage (5v) before any other output can turn on. to enable vsu, short pins 2-3 of jumper ju1. when jumper ju1 is on pins 1-2, all outputs shut down and the ic is in low-current shutdown mode. short-circuit flag (scf) scf is an open-drain output that is high impedance when overload protection occurs. under normal opera- tion scf pulls low. in the default configuration there is a 100k ? pullup resistor (r23) from scf to vm. main step-up output (vm) the main step-up output is set to 3.3v. to enable vm, short pins 2-3 of jumper ju2. to shut down vm, short pins 1-2 of ju2. step-down output (vsd) the step-down output (vsd) is set to 1.8v. to enable vsd, short pins 2-3 of jumper ju3. to shut down outsd, short pins 1-2 of ju3. step-down ok (sdok) the step-down ok output (sdok) is an open-drain out- put that is pulled low until the step-down converter has completed soft-start. for more details on sdok, refer to the max1567 data sheet. auxiliary output 1 ok ( aux1ok ) aux1ok is an open-drain output that goes low when out1 has successfully completed soft-start. aux1ok goes high impedance in shutdown, overload, and ther- mal limit. ccd/lcd bias outputs (out1a, out1b) output out1a provides a regulated +15v output. to enable out1a, short pins 2-3 of ju5. to turn out1a off, short pins 1-2 of ju5. in the standard configuration, out1a and out2 provide the +15v and -7.5v bias voltages for ccd and lcd. out1b is not used in the standard configuration of the ev kit. note 1: if both vsu and vsd are operating, subtract half the vsd load current from the maximum load capability of vsu. note 2: the led outputs are current regulated to 20ma with overvoltage protection set to 15v. table 1. output voltages and maximum currents output voltage (v) maximum current (ma) vsu 5.0 350 (note 1) vm 3.3 600 vsd 1.8 350 out1a 15.0 40 out2 -7.5 -80 ledout+ to ledout- 15.0 max (note 2) 20
the outputs out1a and out1b can be configured to use a flyback transformer to provide both the +15v (out1a) and -7.5v (out1b) necessary for ccd and lcd bias. this is useful when using the max1566 where out2 is configured as a boost converter. see the flyback transformer configuration for out1a/out1b section. inverter output (out2) out2 is a regulated -7.5v output. to enable out2, connect pins 2-3 of jumper ju6. to shut down out2, connect pins 1-2 of ju6. out2 can also be configured as a boost output when evaluating the max1566. see the evaluating the max1566 section. led outputs (out3+, out3-) the outputs out3+ and out3- are for driving a series of white leds for display backlighting. the ev kit comes with four surface-mount white leds installed and is con- figured to drive the leds at a regulated 20ma. to pro- tect against an open led string, the overvoltage protec- tion limits the maximum output voltage to 15v. to evaluate with fewer than four leds, short the pads of the unused leds. to use leds other than the ones mounted on the board, break the string by removing one of the leds on the board, then connect a series array consisting of two to six white leds in series to the out3+ and out3- outputs. the anode side of the array connects to out3+, and the cathode side con- nects to out3-. to enable the led outputs, short pins 2-3 of ju4. to turn the led outputs off, short pins 1-2 of ju4. to adjust the led brightness or overvoltage pro- tection, see the adjusting the led brightness section. customizing the max1567 evaluation kit adjusting the step-up output (vsu) the main step-up output (vsu) is adjustable from 2.7v to 5.5v using the following procedure: 1) select a value for r16 between 10k ? and 100k ? . 2) solve for r15 using: 3) install resistors r15 and r16. adjusting the main step-up output (vm) the main step-up output (vm) is adjustable from 2.7v to vsu using the following procedure: 1) select a value for r18 between 10k ? and 100k ? . 2) solve for r17 using: 3) install resistors r17 and r18. rr v vm 17 18 125 1 . = ? ? ? ? ? ? - rr v vsu 15 16 125 1 . = ? ? ? ? ? ? - evaluates: max1566/max1567 max1567 step-up main evaluation kit 4 _______________________________________________________________________________________ table 2. jumper functions table 3. pc board jumper functions jumper short pins 1-2 short pins 2-3 ju1 all outputs are shut down. vsu enabled. ju2 vm shut down. vm enabled. ju3 vsd shut down. vsd enabled. ju4 leds (out3+/out3-) shut down. leds (out3+/out3-) enabled. ju5 out1 shut down. out1 enabled. ju6 out2 shut down. out2 enabled. jumper function default ju7 open ju8 s el ect the i np ut p ow er for the o u t2 conver ter . s hor t onl y one of these j um p er s. s hor t ju 7 to connect the o u t2 i np ut p ow er to batt, or shor t ju 8 to connect to v s u . short ju9 connects the ground planes together. this must remain shorted for proper circuit operation. short ju10 open ju11 short ju12 select the input power for the step- down converter. short only one of these jumpers. short ju10 to connect the step-down input power to batt, short ju11 for vsu, or short ju12 for vm. open ju13 s el ects top ol og y for ou t1a/ou t1b. s hor t for ou t1a step - up , or op en for ou t1a/ou t1b tr ansfor m er fl yb ack. short
evaluates: max1566/max1567 max1567 step-up main evaluation kit _______________________________________________________________________________________ 5 configuring the step-down output (vsd) the input to the step-down converter (pvsd) on the ev kit comes connected to vsu, but the connection can be changed to either batt or vm. to use batt as the input to the step-down converter, cut the trace shorting ju11 and short the pads of ju10. to use vm as the input to the step-down converter, cut the trace shorting ju11, and short the pads of ju12. make sure one and only one of ju10, ju11, and ju12 are shorted. the step-down output voltage (vsd) is adjustable from 1.25v to v pvsd using the following procedure: 1) select a value for r20 between 10k ? and 100k ? . 2) solve for r19 using: 3) install resistors r19 and r20. adjusting the out1a voltage out1a can be set to a voltage above 1.25v. the upper limit depends on the ratings of the external components. note that if the input voltage is greater than what out1a is set to, then out1a rises above its regulation voltage. use the following procedure to set v out1a : 1) select a value for r12 between 10k ? and 100k ? . 2) solve for r11 using: 3) install resistors r11 and r12. configuring the inverting output (out2) the input to the inverter is normally connected to vsu. to change this connection to batt, cut trace shorting ju8 and short the pads of ju7. note that the lower limit of inverter operation, when powered from batt, depends on the external p-channel mosfet threshold voltage. to adjust the out2 voltage, use the following procedure: 1) select a value for r13 between 10k ? and 100k ? . 2) solve for r14 using: 3) install resistors r13 and r14. adjusting the led brightness resistor r3 sets the regulation current of the leds as follows: the overvoltage protection threshold for the leds is also adjustable. to ensure the leds are current regu- lated, this threshold (v ovp ) must be set higher than the maximum forward voltage drop of the led string. v ovp should be set lower than the maximum voltage ratings of the capacitor, diode, and mosfet (c1, d1, and n1) used in the led driver circuit. use the following proce- dure to set the overvoltage protection: 1) select a value for r1 between 10k ? and 100k ? . 2) solve for r2 using: 3) install resistors r1 and r2. changing the switching frequency the switching frequency of the max1567 is adjustable. typically, frequencies from 400khz to 500khz provide a good compromise between efficiency and compo- nent size. to change the frequency, replace c3 and r4. refer to the max1567 data sheet for information on selecting values for these components. evaluating the max1566 to evaluate the max1566, first carefully remove u1 and replace it with the max1566. free samples of the max1566 can be obtained from maxim. the max1566 requires that out2 be configured as a boost converter. rr v ovp 12 125 1 . = ? ? ? ? ? ? - r v i led 3 02 . = rr v out 13 14 125 2 . = ? ? ? ? ? ? - rr v out a 11 12 125 1 1 . = ? ? ? ? ? ? - rr v vsd 19 20 125 1 . = ? ? ? ? ? ? -
evaluates: max1566/max1567 configuring out2 as a boost converter to configure out2 as a boost converter, remove com- ponents c17, r13, r14, d7, and p1. then add compo- nents c19, r30, r31, d8, l7, and n3. refer to the max1566/max1567 data sheet for information on com- ponent selection. table 4 shows typical components for generating +15v at up to 20ma. flyback transformer configuration for out1a/out1b out1 can be configured to provide two outputs using a transformer. this is usually done to generate ccd/lcd bias when using the max1566. to use a transformer, remove l2 and cut the trace shorting ju13. install the transformer on the footprint (t1) that overlaps l2 and ju13. refer to the max1566/max1567 data sheet for details on component selection. table 5 shows typical components for generating +15v and -7.5v. max1567 step-up main evaluation kit 6 _______________________________________________________________________________________ table 4. typical components for out2 boost circuit designation qty description c19 1 1f 10%, 25v x7r ceramic capacitor (0805) tdk c2012x7r1e105k d8 1 schottky diode 40v, 500ma (sod-123) central cmhsh5-4 l7 1 1.5h inductor sumida cdrh3d16-1r5 n3 1 n-channel mosfet (sot23) fairchild fdn337n r30 1 1m ? 1% resistor (0603) r31 1 90.9k ? 1% resistor (0603) table 5. typical components for out1a/out1b transformer circuit designation qty description c18, c20 2 1f 10%, 25v x7r ceramic capacitors (1206) tdk c3216x7r1e105k d6 1 schottky diode 40v, 500ma (sod-123) central cmhsh5-4 d9 1 schottky diode 20v, 500ma (sod-123) central cmhsh5-2l n2 1 n-channel mosfet (sot23) fairchild fdn337n r11 1 1m ? 1% resistor (0603) r12 1 90.9k ? 1% resistor (0603) t1 1 transformer tdk 565630t
evaluates: max1566/max1567 max1567 step-up main evaluation kit _______________________________________________________________________________________ 7 max1567 u1 dl3 dl1 n1 ref 2 1 3 35 36 1 fb3h 39 fb3l 15 ref 22 osc 18 1 ju1 batt vsu batt vsu r21 100k ? gnd ledout- ledout+ d2 c1 1 f c15 10 f c16 10 f c17 1 f r26 r27 l1 1.5 h l3 22 h r1 1m ? r3 10 ? r2 90.9k ? d1 c2 0.1 f c3 100pf r4 51k ? d3 d4 d5 batt 3 2 onsu 14 1 ju2 3 3 2 onm 8 1 ju3 2 onsd 3 40 1 ju4 2 on3 3 4 1 ju5 2 on1 3 29 vsu 1 ju6 r5 c4 2 on2 11 susd 16 ccsu r6 c5 10 ccsd r7 c6 12 ccm r8 c7 38 cc3 r9 c8 2 cc1 r10 c9 30 cc2 20 aux1ok vsu r22 100k ? aux1ok 21 sdok sdok batt dl1 batt vsu ju8 short fb1 fb1 3 fb2 31 gnd 33 fb2 d10 c11 dl2 d7 r13 549k ? r14 90.9k ? r15 274k ? r16 90.9k ? r23 100k ? dl2 34 indl2 32 p1 out2 out2 -7.5v +5v scf vm +3.3v vsd +1.8v vsu ref l4 10 h l5 3.0 h r17 150k ? r18 90.9k ? l6 10 h pv 37 pvsu 25 lxsu 24 batt batt pgsu 23 pgm 26 fbsu 17 pvm 28 scf 19 lxm 27 fbm 13 pvsd 7 batt vsu ju11 short lxsd 6 fbsd 9 pgsd ep 5 ju9 short vsu 1 d11 c10 47 f c21 47 f c14 47 f c13 c12 10 f r19 40.2k ? r20 90.9k ? 2 batt ju10 open ju12 open ju7 open figure 1. max1567 ev kit schematic (sheet 1 of 2)
evaluates: max1566/max1567 max1567 step-up main evaluation kit 8 _______________________________________________________________________________________ n2 n3 l7 batt dl2 optional out2 boost circuit out1a boost circuit and optional out1a/out1b transformer circuit d8 r30 c19 out1a +15v out1b -7.5v out2 r31 d6 fb1 c18 1 f r24 r28 r29 r25 c20 1 3 4 2 t1 l2 1.5 h batt ju13 short 7 8 d9 fb2 5 6 3 2 1 dl1 r11 1m ? r12 90.9k ? figure 1. max1567 ev kit schematic (sheet 2 of 2)
evaluates: max1566/max1567 max1567 step-up main evaluation kit _______________________________________________________________________________________ 9 figure 2. max1567 ev kit component placement guide?omponent side
evaluates: max1566/max1567 max1567 step-up main evaluation kit 10 ______________________________________________________________________________________ figure 3. max1567 ev kit component placement guide?older side
evaluates: max1566/max1567 max1567 step-up main evaluation kit ______________________________________________________________________________________ 11 figure 4. max1567 ev kit pc board layout?omponent side
evaluates: max1566/max1567 max1567 step-up main evaluation kit 12 ______________________________________________________________________________________ figure 5. max1567 ev kit pc board layout?nner layer 2
evaluates: max1566/max1567 max1567 step-up main evaluation kit ______________________________________________________________________________________ 13 figure 6. max1567 ev kit pc board layout?nner layer 3
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. evaluates: max1566/max1567 max1567 step-up main evaluation kit figure 7. max1567 ev kit pc board layout?older side

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