AP2200 AKM | Alldatasheet
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[ AP2200] MS1462-E-00 1 AP2200 Step-up DC/DC converter IC supporting 1 or 2 solar cells OVERVIEW The 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 batteries or outputting USB VBUS voltage. Also, the MPPT (Max Power Point Tracking) function is embedded in order to maximize the output power from the solar cells.
FEATURES
Input voltage range 0.4 V to 1.6 V Operating temperature range -30 to 85°C Input power 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 LC pin is fixed to H No battery detect function When the VB pin voltage decreases, the LC pin is fixed to H Efficiency 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-ion battery and USB VBUS source with 1 or 2 solar cells
[ AP2200] MS1462-E-00 2 BLOCK DIAGRAM S e t ou t p u t v o l t a g e to 4 V PIN LAYOUT 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 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 0.1uF When connected to battery To other equipment 13141516 8765
16 PIN
(Top View)
[ AP2200] MS1462-E-00 3 Table 1 Pin functions 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 Inductor 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: The test pin should be connected to GND. Note 4: The tab pin may be connected to GND or left open. I/O PINS & FUNCTIONS
[ AP2200] MS1462-E-00 4 Table 2 Absolute maximum ratings TA = 25ºC except as otherwise noted Item Symbol Min Max Unit Remarks Pin voltage Range (Note1) VIN1 -0.3 1.98 V Note3 VIN2 -0.3 5.5 V Note4 Input power PIN 0.8 W Operational temperature Range TA -30 85 °C Storage temperature Range TSTG -40 150 °C Junction temperature TJ 150 °C Power dissipation PD 0.8 W Note 1: The voltage is based on ground pin voltage. Note 2: If 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 Operating conditions Item Symbol Condition Min Typ Max Unit Supply voltage range VIN 0.4 1.6 V Supply voltage on startup VINSTUP -30°C < TA <-10°C -10°C < TA <85°C 0.5 0.4 - 1.6 V Operational temperature TA -30 - 85 °C Note 1: The voltage is based on the ground pin. ABSOLUTE MAXIMUM RATINGS OPERATING CONDITIONS
[ AP2200] MS1462-E-00 5 Table 4 Electric characteristics TA = 25ºC except as otherwise noted Item Symbol Condition Min Typ Max Unit DC/DC converter VOUT voltage (Note3) VTGT TA = 25 ºC, SEL=0 3.96 4.0 4.04 V TA = -30 to 85ºC , SEL=0 3.92 4.0 4.08 TA = -30 to 85ºC , SEL=1 4.75 5.0 5.25 VOUT hysteresis VTGTHYS 0.16 0.38 0.60 % High-side on resistance RONTOP 0.2 Ω Low-side on resistance RONBOT 0.1 Switching frequency fOSC 450 500 550 kHz Low-side current limit (Note 2) ILIM 0.9 1.2 1.5 A MPPT circuit VPM open circuit voltage ratio MPP MPP=VPM/VOC 78 80 82 % Open circuit voltage sampling period tSH 90 100 110 ms Monitoring circuit No battery detect voltage VBLOW 1.0 - 2.5 V Low VOUT detect voltage VOL 2.35 2.65 2.90 V Logic I/O External switch driving voltage VOLLC I=-1uA - - GND+0.1 V VOHLC I=1uA VOUT>VB VOUT<VB VOUT-0.45 VB-0.45 - - Standby input voltage VILSTB - - 0.3 V VIHSTB 1.0 - - Output voltage switching input voltage (Note 4) VILSEL - - VOUT*0.3 V VIHSEL VOUT*0.7 - - Control part Internal regulator voltage VREG 1.62 1.8 1.98 V Operating frequency fCK 0.9 1.0 1.1 MHz Pin current VIN pin current IVIN During normal operation: VIN<1.2V@ TA >25°C VIN<1.6V@ TA <25°C - - 50 A VB pin current IVB LC=H/L - 10 20 A Internal pull-down resistance STBY pin RPDSTBY 0.5 - 1.5 MΩ SEL pin RPDSEL 0.5 - 1.5 MΩ Note 1: The voltage is based on the ground pin. Note 2: Not tested in mass production. Note 3: Only tested at TA = 25ºC in mass production. Note 4: Connect the SEL pin to the VOUT or the GND pin. ELECTRIC 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 VOUT reaches the voltage required for operation of the step-up converter, the low voltage startup circuit stops and the step-up converter starts. After that, the step-up converter increases VOUT to the target voltage (V TGT) and controls V OUT so that it will be stabilized at VTGT. Also, when VOUT reaches VTGT, 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 (VIHSTB) by applying voltage, the external load switch is turned OFF to stop the power supply. The step-up converter is still running even in a standby state. When the STBY pin is set to a low level (VILSTB) by applying voltage, the standby mode is released to start the power supply. The VB pin voltage is less than or equal to VBLOW: The AP2200 has a battery monitoring function. When the VB pin voltage deceases to VBLOW or lower, a battery is assumed to be removed and the external load switch is turned OFF to stop the power supply. When the VB pin voltage increases to VBLOW or higher, a battery is assumed to be reinserted 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 VOL: When the VOUT pin voltage decreases to VOL and lower, the external load switch is turned OFF to stop the power supply. The step-up converter is still running. When VOUT reaches VTGT again, the power supply is restarted. When sampling the open circuit voltage (VOC) of the solar cell(s) per the cycle tSH, The AP2200 turns OFF the external load switch as well as pausing the voltage step-up operation. When the sampling of the open circuit voltage comes to an end, the voltage step-up operation resumes. Unless VOUT reaches VTGT again, the external load switch is not turned ON. This prevents back flow from the battery to VOUT to minimize the battery consumption when the power supply from the solar cell(s) decreases, and the step-up converter cannot increase the voltage sufficiently. OPERATION DETAILS
[ AP2200] MS1462-E-00 7 2. Output voltage setting The output voltage (VTGT) is selectable based on the SEL pin. (Table 5) Table 5 Output voltage setting SEL pin level Output voltage (VTGT) 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 (VOC) of the solar 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 VOUT. 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 VTGT, 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 VOUT after startup) VBLOW VOL VOC VPM VTGT VB VOUT H L H L LC pin STBY pin Pin voltage Step-up operation stop Internal initialization and open circuit voltage sampling (voltage step-up stop) Open circuit voltage sampling (step-up operation stop) Open circuit voltage sampling (step-up operation stop) Open circuit voltage sampling period tSH VTGT-VTGTHYS
[ AP2200] MS1462-E-00 9 5.2. Behavior when solar cell output decreases VBLOW VOL VOC VPM H L H L VB VOUT VTGT VTGT-VTGTHYS 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 circuit voltage sampling period tSH Solar cell output decreases
[ AP2200] MS1462-E-00 10 5.3. Behavior when the STBY pin is asserted VBLOW VOL VOC VPM H L H L VB VOUT VTGT 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 sampling period tSH Set STBY to H Set STBY to L VTGT-VTGTHYS
[ AP2200] MS1462-E-00 11 5.4. Behavior when no battery is connected.
[ AP2200] MS1462-E-00 12 Application schematics 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 Note1: Select the C1 value to prevent the LC pin voltage from exceeding 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 refer to table 6 for external components. Table 6．Reference design list of materials Item Symbol Part number Manufacturer Value Ceramic Capacitors CIN - - 10F COUT - - 10F CREG - - 1F CCP - - 0.01F CLC - - 0.1F Inductors L1 SLF6045T-4R7N2R4-3PF TDK 4.7H L2 SLF6045T-6R8N2R0-3PF TDK 6.8H Load switches M1, NTS2101P On Semiconductor
AsahiKASEI AKM confidential [AP2200] Rev1.01 14 2012/10 PACKAGE 0.05 M 3.00±0.05 3.00±0.05 0.60MAX S 0.05 S 0.10±0.05 1.25±0.05 1.80±0.05 0.30±0.05 0.575±0.05 C0.05 0.25±0.05 0.30±0.05 0.25±0.05 0.50
AsahiKASEI AKM confidential [AP2200] Rev1.01 15 2012/10 MARKING Y WW A (1) Pin 1 Mark (2) Part No. : 2200 (3) Year Code (last 1 digit, ex: “2” for year 2012) (4) Week Code (5) Management No. (1) 2200 (3) (2) (4) (5)
Rev1.01 16 2012/10 IMPORTANT NOTICE These products and their specifications are subject to change without notice. When you consider any use or application of these products, please make inquiries the sales office of Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the products. Descriptions of external circuits, application circuits, software and other related info rmation 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, application circuits, software and other related information in the design of your equipment s. AKM assumes no responsibility for any loss es incurr ed 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 hazard 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.