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[ AP2200] ms1462 - e - 00 1 AP2200 s tep - up dc/dc converter ic supporting 1 or 2 solar cells o verview t he AP2200 is a voltage step - up dc/dc converter using the synchronous rectification method to be activated with 1 or 2 solar cells and is ideal for charging lithium - ion batter ies or outputting usb vbus voltage. also, the mppt (max power point tracking) function is embedded in order to maximize the output power f rom the solar cell s . f eatures ? input voltage range 0.4 v to 1.6 v ? operating temperature range - 30 to 85 c ? input powe r up to 400 mw per 1 cell up to 800 mw per 2 cells ? output voltage 4.0 v ( 2 %) per 1 cell 5.0 v (5.0%) per 2 cells ? control method comparator control method ? rectification method synchronous rectification method ? standby function when the stby pin is h, the l c pin is fixed to h ? no battery detect function when the vb pin voltage decreases, the lc pin is fixed to h ? e fficiency 70% ( 1 cell input, 4.0 v, 50 ma output ) , 80% ( 2 cells input, 5.0 v, 80 ma output ) ? package qfn 16 pin ? application for charging a lithium - io n battery and usb vbus source with 1 or 2 solar cells
[ AP2200] ms1462 - e - 00 2 b lock diagram s e t o u t p u t v o l t a g e to 4 v p in layout (top view) sw l solar cell 0.4v~0.8v (1 cell 400mw) vin pg 10uf vcp 0.01uf vout ref ldo osc logic test1 test2 gnd 10uf 1uf vreg stby pre - driver lc sel vb mcu vin monitor bat load control 4v 1.5% vout monitor start up lc c1 0.1uf when connected to battery to other equipment sw l solar cell 0.4v~0.8v (1 cell 400mw) vin pg 10uf vcp 0.01uf vout ref ldo osc logic test1 test2 gnd 10uf 1uf vreg stby pre - driver lc sel vb mcu vin monitor bat load control 4v 1.5% vout monitor start up lc c1 0.1uf when connected to battery to other equipment 1 2 3 4 12 11 10 9 13 14 15 16 8 7 6 5 16 pin 3 x 3 mm qfn vcp vin gnd vreg stby test2 test1 sel vout vout lc vb sw sw pg pg
[ AP2200] ms1462 - e - 00 3 table 1 pin function s pin no pin name type (note1) i/o (note2) description remarks 1 pg gnd - dc/dc ground pin 2 pg gnd - dc/dc ground pin 3 vcp a io charge pump pin 4 vin pwr - power input pin 5 gnd gnd - ground pin 6 vreg a io internal regulator output pin 7 sel d i output voltage switch input pin l: 4 v / h: 5 v 8 test1 - - test pin (note3) 9 test2 - - test pin (note3) 10 stby d i standby input pin h: standby 11 vb a i battery monitoring input pin 12 lc d o external switch control pin 13 vout a io dc/dc output pin 14 vout a io dc/dc output pin 15 sw a io induc tor connect pin 16 sw a io inductor connect pin ep gnd gnd - tab pin (note4) note 1: a: analog pin, d: digital pin, gnd: ground pin, pwr: power pin note 2: i: input pin, o: output pin , io: input and output pin note 3: t he test pin s hould be connect ed to gnd. note 4: t he tab pin may be connect ed to gnd or left open. i/o pins & functions
[ AP2200] ms1462 - e - 00 4 table 2 absolute maximum rating s t a = 25oc except as otherwise noted item symbol min max unit remarks pin voltage range (note1) v in1 - 0.3 1.98 v note3 v in2 - 0.3 5.5 v note4 input power p in 0.8 w operational temperature range t a - 30 85 c storage temperature range t stg - 40 150 c junction temperature t j 150 c power dissipation p d 0.8 w note 1: the voltage is based on ground pin voltage. note 2: i f the absolute maximum rating is exceeded, the device may be damaged. also, normal behavior cannot be guaranteed. note 3: vin pin and vreg pin note 4: vcp pin, sel pin, stby pin, vb pin, lc pin, vout pin and sw pin table 3 operati ng condition s item symbol condition min typ max unit supply voltage range v in 0.4 1.6 v supply voltage on startup v instup - 30 c < t a < - 10 c - 10 c < t a <85 c 0.5 0.4 - 1.6 v operational temperature t a - 30 - 85 c note 1: the voltage is based on the g round pin. a bsolute maximum ratings o perating conditions
[ AP2200] ms1462 - e - 00 5 table 4 electric c haracteristics t a = 25 oc except as otherwise noted item symbol condition min typ max unit dc/dc converter v out voltage (note3) v tgt t a = 25 oc , sel=0 3.96 4.0 4.04 v t a = - 30 to 85 oc , sel=0 3. 92 4.0 4.08 t a = - 30 to 85 oc , sel=1 4.75 5.0 5.25 v out hysteresis v tgthys 0.16 0.38 0.60 % high - side on resistance r ontop 0.2 onbot 0.1 switching frequency f osc 450 500 550 khz low - side current limit (note 2) i lim 0. 9 1.2 1. 5 a mppt circuit vpm open circuit voltage ratio mpp mpp=v pm /v oc 78 80 82 % open circuit voltage sampling period t sh 90 100 110 ms monitoring circuit no battery detect voltage v blow 1.0 - 2.5 v low v out detect voltage v ol 2.3 5 2.65 2.90 v logic i/o external switch driving voltage v ollc i= - 1ua - - gnd+0.1 v v ohlc i=1ua v out >v b v out 25 c vin<1.6v@ t a <25 c - - 5 0 ? vb lc=h/l - 10 20 ? pdstby 0.5 - 1.5 m pdsel 0.5 - 1.5 m note 1: the vol tage is based on the ground pin. note 2: no t tested in mass production . note 3: only tested at t a = 25 oc in mass production. note 4: connect the sel pin to the vout or the gnd pin . e lectric characteristics
[ AP2200] ms1462 - e - 00 6 1. operation overview when the output voltage is entere d into v in from the solar cell (s) , the low voltage startup circuit starts to step up the output voltage (v out ). when v out reaches the voltage required for operation of the step - up converter, the low voltage startup circuit stops and the step - up converter s tarts. after that, the step - up converter increases v out to the target voltage (v tgt ) and controls v out so that it will be stabilized at v tgt . also, when v out reaches v tgt , the step - up converter decreases the lc pin to a low level. for the application where an external pmos load switch is connected to the lc pin, when the lc pin becomes a low level, the external switch is turned on to start the power supply to the equipment. however, if one of the conditions below is met, the external load switch is turned o ff to stop the power supply: ? the stby pin is set to a high level: the AP2200 has a standby function. when the stby pin is set to a high level (v ihstb ) by applying voltage, the external load switch is turned off to stop the power supply. the step - up convert er is still running even in a standby state. when the stby pin is set to a low level (v ilstb ) by applying voltage, the standby mode is released to start the power supply. ? the vb pin voltage is less than or equal to v blow : the AP2200 has a battery monitori ng function. when the vb pin voltage deceases to v blow or lower , a battery is assumed to be remove d and the external load switch is turned off to stop the power supply. when the vb pin voltage increases to v blow or higher , a battery is assumed to be reinse rted and the external load switch in turned on to start the power supply. to disable this function, connect the vb pin to the vout pin. ? the vout pin voltage is less than or equal to v ol : when the vout pin voltage decreases to v ol and lower , the external l oad switch is turned off to stop the power supply. the step - up converter is still running. when v out reaches v tgt again, the power supply is restarted. ? w hen sampling the open circuit voltage (v oc ) of the solar cell (s) per the cycle t sh , the AP2200 turns off the external load switch as well as paus ing the voltage s tep - up operation. when the sampling of the open circuit voltage comes to an end, the voltage step - up operation resumes. unless v out reaches v tgt again, the external load switch is not turned on. this prevents back flow from the battery to v out to minimize the battery consumption w hen the power supply from the solar cell (s) decreases , and the step - up converter can not increase the voltage sufficiently . o pe ration details
[ AP2200] ms1462 - e - 00 7 2. output voltage setting the output voltage (v tgt ) is selectable based on the sel pin. ( table 5) table 5 output voltage setting sel pin level output voltage (v tgt ) setting 0 4 v 1 5 v 3. mppt control the voltage step - up operation is paused per the cycle t sh and the open circuit voltage (v oc ) of the so lar cell (s) is sampled. this pwm function first calculates the voltage (v pm ) from voc where the maximum output can be obtained based on the solar cell properties and then controls the step - up converter to obtain the voltage. 4. output voltage control the step - up converter always monitors v out . as soon as vout reaches the setting voltage (v tgt ), the converter stops the voltage step - up . when the voltage step - up operation is stopped, v out decreases due to load consumption. when v out drops by v tgthys or more form v tgt , the step - up operation is restarted.
[ AP2200] ms1462 - e - 00 8 5. timing chart note: a timing chart only shows an operation overview and the scale of time and voltage is not accurate. 5.1. normal operation (the voltage increases to v out after startup) v blow v ol v oc v pm v tgt v b v out h l h l lc pin stby pin pin voltage step - up operation stop internal initialization and o pen circuit voltage sampling (voltage step - up stop) open circuit voltage sampling ( step - up operation st op) open circuit voltage sampling ( step - up operation stop) open circuit voltage sampling period t sh v tgt - v tgthys
[ AP2200] ms1462 - e - 00 9 5.2. be havior when solar cell output decreases v blow v ol v oc v pm h l h l v b v out v tgt v tgt - v tgthys lc pin stby pin pin voltage open circuit voltage sampling ( step - up opera tion stop) open circuit voltage sampling ( step - up operation stop) open circuit voltage sampling ( step - up operation stop) step - up operation stop open circuit voltage sampling period t sh solar cell output decreases
[ AP2200] ms1462 - e - 00 10 5.3. behavior when the stby pin is asserted v blow v ol v oc v pm h l h l v b v out v tgt lc pin stby pin pin voltage open circuit voltage sampling ( step - up operation stop) open circuit voltage sampling ( step - up operation stop) open circuit voltage sampling ( step - up operation stop) step - up operation stop open voltage samplin g period t sh set stby to h set stby to l v tgt - v tgthys
[ AP2200] ms1462 - e - 00 11 5.4. behavior when no battery is connected.
[ AP2200] ms1462 - e - 00 12 ? application s chematics s e t o u t p u t v o l t a g e t o 4 v s e t o u t p u t v o l t a g e t o 5 v note 1 : select the c1 value to prevent the lc pin voltage from exceed ing the absolute maximum rating due to the current through parasitic capacitance of the external load switch. reference design (1 cell 400mw) when connected to battery to other equipment solar cell 0.4 to 0.8v when connected to usb (2 cell 800mw) solar cell 0.8 to 1.6v
[ AP2200] ms1462 - e - 00 13 note2: please r efer to table 6 for external components. table 6 item symbol part number manufacturer value ceramic capacitors cin - - 10 ? f cout - - 10 ? f creg - - 1 ? f ccp - - 0.01 ? f clc - - 0.1 ? f inductors l1 slf6045t - 4r7n2r4 - 3pf tdk 4.7 ? h l2 slf6045t - 6r8n2r0 - 3pf td k 6.8 ? h l oad switches m1, m2 nts2101p on semiconductor -
asahikasei akm confidential [ AP2200] rev 1.01 14 201 2 / 10 p ackage 0 . 05 m 3 . 00 0 . 05 3 . 0 0 0 . 0 5 0 . 6 0 m a x 1 s 0 . 05 s 0 . 1 0 0 . 0 5 1 . 2 5 0 . 0 5 1 . 80 0 . 05 0 . 30 0 . 05 0 . 5 7 5 0 . 0 5 c 0 . 05 0 . 25 0 . 05 0 . 30 0 . 05 0 . 25 0 . 05 0 . 50
asahikasei akm confidential [ AP2200] rev 1.01 15 201 2 / 10 m arking y ww a ( 1) pin 1 mark (2) part no. : 2200 (3) y ear code (last 1 digit, ex: 2 for year 2012) (4) w eek code (5) management no. (1) 2200 (3) (2) (4) (5)
rev 1.01 16 201 2 / 10 important notice ? these products and their specifications are subject to change without notice. w hen you consider any use or application of these products , please make inquiries the sales office of asahi kasei microdevices corporation (akm) or authorized distributor s as to current status of the products. ? descriptions of external ci r cuits, application circuits, software and other related info r mation contained in this document are provided only to illustrate the operation and application examples of the semiconductor products . you are fully responsible for the incorporation of these external circuits, ap plication circuits, software and other related information in the design of your equipment s . akm assumes no responsibility for any loss e s incurr e d by you or third parties arising from the use of these information herein . akm assumes no liability for infrin gement of any patent, intellectual property, or other rights in the application or use of such information contained herein. ? any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. ? akm products are neither intended nor authorized for use as critical components note1) in any safety, life support, or other haza rd related device or system note2) , and akm assumes no responsibility for such use, except for the use approved with the express written consent by representative director of akm. as used here: note1) a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. note2) a haza rd related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. ? it is the responsibility of the buyer or distributor of akm product s, who distributes, disposes of, or otherwise places the product with a third party , to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

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