CM9112

CM9112 CALMIRCO | Alldatasheet

Document overview

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Technical content

Features

Monolithic linear charger requires no inductors, external sense resistors or blocking diodes 4.75V to 6.50V operating input voltage range It can support up to 30V on Adaptor input and 7V on USB input Up to 1.5A total system and charging current Provides power to the host system and charges the battery at the same time Supports AC wall adapter and USB input 4.2V/450mA, available for host system under Adapter input It provides 0.5% accuracy of CV mode for 4.2V An optional 0.1µF cap on CT pin programs 30 min./ 60 min. timeout for Precharge/Termination. Two Thermal limits controls chip temperature and prevents overheating Remote sensing pin for Battery voltage Pin to pin shortage protection Maximum of 1µA battery drain current Optional Battery thermistor (NTC) interface TQFN-16, RoHS compliant lead-free package

Applications

Cellular phones and smart phones Pocket computers and PDAs Digital Still Camera Product Description The CM9112 is an integrated linear-mode charger for a single-cell, Lithium-ion battery. It provides both charg­ ing current for the battery and power for the host sys­ tem. It can deliver charging current up to 1A and system current up to 450mA at the same time. It takes power either from AC Adapter or USB Adapter. When both are present it automatically chooses AC Adapter as input. It requires no external blocking diodes or current sense resistors and uses 2 external resistors to program dif­ ferent charging current under AC Adapter or USB inputs. The CM9112 provides Precharge Mode, Constant Cur­ rent Mode (Fast-charge), Constant Voltage Mode and Termination by low current detection. Programmable timeout for Precharge and Termination and Thermistor interface to check Battery Temperature are optional available to the users. The CM9112 is protected against the use of a wrong high voltage Adapter up to 30V. An antiringing protec­ tion on Adaptor input allows the use of a cheaper adap­ tor without need of a shock inductor. Pin to pin shortage protection makes it friendly to the users against accidental handling during mounting or checking. The CM9112 is packaged into a miniature 16-pin TQFN package and operates between –40°C and 85°C ambient. Typical Application AD (AC Adapter ) USB Li-ion Battery 0.1u NTC VAD VSYS GND VOUT VREF THERM ISET2 USB ENA CM9112 ISET1 CT STAT2 VIN GAD BSEN STAT1 2.5k 0.1u SYSTEM 4.2V/450mA 10k 4.7u © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

(Pins Up View) TOP VIEW (Pins Down View) VREF ISET1 GND USB STAT1 THERM VOUT BSEN VIN VAD GAD VSYS ISET2 ENA CT STAT2 CM9112 00QE Pin 1 Marking 16-Lead TQFN Package (4mm x 4mm) Note: This drawing is not to scale. PIN DESCRIPTIONS LEAD(s) NAME

DESCRIPTION

USB compliant power input pin. GND Ground pin. ISET1 Pin to set the maximum USB input current; Also, reflects actual charging current. A resistor between this pin and ground sets the charge current, ICH, RISET1 1000 × 2.5V ICC VREF 4.2V, 2mA reference output pin. ISET2 Pin to set the maximum charging current in the Fast charge (CC) mode. Also, reflects actual charging current. A resistor between this pin and ground sets the charge current, ICH, RISET2 1000 × 2.5V ICC ENA Enable pin. Logic high (default value) enables charging. Logic low disables charg­ ing. ENA does not effect the VSYS output. CT Pin for capacitor, CT, for programming the Precharge and Termination timeout period. Timeout1[min]=300 x CT[μF] Timeout2[min]=600 x CT[μF] STAT2 Charging status indicator 2 pin (open-drain output). STAT1 Charging status indicator 1 pin (open-drain output). THERM Thermistor input pin from battery monitoring circuit. © 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 07/06/06

Ordering Information

Charger output pin (Battery/RF High Power). BSEN Battery voltage remote sense pin. VSYS Power output pin to the host system 4.2V/450mA. GAD Gate drive to external P-MOSFET for adapter input pin. VAD Adapter input voltage pin. VIN Positive input supply voltage pin, which powers the charger. PART NUMBERING INFORMATION Pins Package Lead Free Finish Ordering Part Number1 Part Marking TQFN CM9112-00QE CM9112 00QE Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. Specifications ABSOLUTE MAXIMUM RATINGS PARAMETER RATING UNITS ESD Protection (HBM) kV VIN to GND [GND - 0.3] to +6.5 V Pin Voltages VAD, GND to GND VOUT, VSYS, USB to GND ENA, ISET1, ISET2 to GND STAT1, STAT2 to GND BSEN, VREF, CT, THERM to GND [GND - 0.3] to +30 [GND - 0.3] to +7.0 [GND - 0.3] to +6.5 [GND - 0.3] to +6.5 [GND - 0.3] to +6.5 V V V V V Storage Temperature Range -65 to +150 Operating Temperature Range (Ambient) -40 to +85 Lead Temperature (Soldering, 10sec) 300 ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VAD VAD Operation range 4.75 5.0 6.50 V VUSB USB Operation range 4.50 5.25 V IQ Quiescent Current Charging modes, exclud­ ing current to and STAT1, STAT2 and THERM pins. mA © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

Specifications (cont’d) ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS ISHDN Shutdown Supply Current ENA = "LOW", excluding current to STAT1, STAT2 and THERM pins. 100 µA IREV Battery Reverse Current Both AC Adapter and USB removed 0.5 µA VAD/USB Supply Voltage UVLOVAD UVLO threshold for VAD 4.75 4.8 4.85 V OVPVAD OVP threshold for VAD 6.2 6.4 6.5 V UVLOHYS_VAD UVLO,OVP Hysterezis for VAD 300 mV IIN_AD Total input current under Adaptor input VIN=5.0V; Adaptor in IIN_AD = ISYS + IVOUT 1700 mA IIN_USB Total input current with USB plugged-in and Adapter out VIN=5.0V; USB in, Adap­ tor out IIN_USB 2500 RSET1(kΩ) mA USB switch Rds(on) IIN_USB = 500mA 150 200 mΩ Charger Function IPR Precharge Mode Current VOUT < 3.2V; Adaptor in 0.85 x IPR IVOUT = IPR 250 RSET2 k ( Ω) 1.14 x IPR mA VOUT < 3.2V; USB in, Adaptor out 0.85 x IPR IVOUT = IPR 250 RSET1 k ( Ω) 1.14 x IPR mA VCC CC Mode Voltage Threshold 3.20 3.30 3.40 V ICC CC Mode Charging Current VOUT > 3.5V; Adaptor in 0.92 x ICC IVOUT = ICC 2500 RSET2 k ( Ω) 1.08 x ICC mA VOUT > 3.5V; USB in, Adaptor out 0.92 x ICC IVOUT = ICC 2500 RSET1 k ( Ω) 1.08 x ICC mA VCV CV Mode Voltage Threshold 4.190 4.200 4.210 V ITERM Charging Termination Cur­ rent VOUT > 4.190V; Adapter in 0.8 x ITERM IVOUT = ITERM RSET2 k ( Ω) 1.2 x ITERM mA VOUT > 4.190V; USB in, Adapter out 0.8 x ITERM IVOUT = ITERM RSET1(kΩ) 1.2 x ITERM mA VRCH Recharge Mode Threshold 4.090 4.100 4.110 V © 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 07/06/06

Specifications (cont’d) ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS CT Constant-temperature Mode, Limit (Note 2) 105 125 C OTP Over-temperature Protec­ tion, Limit (Note 3) 130 140 150 C OCP Over-Current Charging (OCP), Limit 1.5 1.7 1.8 A RDSON RDSON of Charger MOSFET ICC = 500mA 100 120 150 mΩ TPR Precharge Timeout (Note 4) Adaptor in; BSEN < 3.2V, CT=0.1µF, 1% Min. TTER Termination Timeout (Note 4) Adaptor in; BSEN > 4.19V, CT=0.1µF, 1% Min. VREF VREF Regulated Voltage VREF IREF < 1mA 4.190 4.200 4.210 V VSYS (Available only with Adapter plugged-in) (Note 5) RDSON MOSFET RON 0.25 Ω VSYS Output Voltage Load Regu­ lation IOUT = 10mA to 300mA 4.1 4.2 4.3 V IOUT = 10mA to 450mA 3.9 4.0 4.1 V ISYS Output Current available 3.9V<VSYS<4.3 450 mA ILIMIT Over-Current Shut-down Threshold (Note 6) 1200 1500 mA Control Function IBSEN BSEN Pin Leakage Current VIN = 0 0.2 1.0 µA VSTAT1 VSTAT2 STAT1, STAT2 (Open Drain) Output Low Voltage ISINK = 5mA ISINK = 20mA 0.1 0.5 V V VIH EN ENA Input High Level 1.5 V VIL EN ENA Input Low Level 0.4 V Thermistor Function (Note 7, 8) VBH Battery HOT Voltage Threshold (THERM Pin) VIN = 5.0V (Note 9) 0.9 x VBH VBH = 0.5 x VIN 1.1 x VBH V VBC Battery COLD Voltage Threshold (THERM Pin) VIN = 5.0V (Note 9) 0.9 x VBC VBC = 7/8 x VIN 1.1 x VBC V Hysterezis of VBH, VBC 100 120 mV Note 1: TA = 25°C unless otherwise specified. Note 2: When chip temperature reaches 105°C, the IC’s internal thermal limit will maintain this temperature by decreasing the pro­ grammed charge current. Note 3: When chip temperature reaches 140°C, the IC goes into a latched shutdown mode. It stops charging, stops supplying VSYS with current from Adapter/USB, and switches VSYS (Baseband) to VOUT(Battery). To resume the charging function, a tog­ gle of VAD/USB is required. Note 4: The timeout can be disabled by connecting the CT pin to VIN. When enabled, both Timeout1 and 2 are proportional to the value of the capacitor connected on the pin CT. However, the ratio Timeout2/Timeout1 is constant and equal to two. The tim­ ing periods are digital, internally generated, based on a clock rate programmable by an external capacitor connected in the CT pin. Timeout feature is available only with AC Adaptor plugged in. Under USB input, both timeout are disabled to allow longer charging time due to low input current available. Note 5: When both the Adapter and USB are removed, VSYS is switched over to battery, through an external MOSFET, Q2. Note 6: When the VSYS maximum current limit is reached, LDO1 regulates this current by decreasing VSYS. However, VSYS can­ not go below VOUT (battery) by more than one diode’s forward voltage (Vfwd) due to the body diode of the external MOS­ © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

Specifications (cont’d) FET, Q2. When this condition occurs, the battery will provide extra current to keep VSYS constant at Vbatt-Vfwd. This lasts until the power dissipated in LDO1 triggers the OTP. As a result, there will be no input current to supply either charging or LDO1. Current will still be available from battery to supply VSYS, through the external Q2. To resume charging (after the chip temperature drop bellow 120°C), the VAD/USB inputs must be toggled. Note 7: This feature can be disabled by connecting the THERM pin to GND. Note 8: This function requires that Battery Thermistor should be connected between the THERM pin and GND. Another resistor connected between THERM pin and VIN is required, its value should equal the Thermistor Hot Value (at 50°C). In order to catch both the 0°C and 50°C thresholds (typical range for Li-ion battery) use Thermistors following 7/1 ratio (Thermistor COLD/Thermistor HOT=7). Note 9: If the battery HOT/COLD detection identifies a condition outside the thresholds, the IC stops charging the battery and waits for the temperature to return to the normal value. During this event, VSYS will continue to be supplied with the required cur­ rent. Functional Block Diagram GAD USB VIN VAD ISET2 GND CT Adapter Current Limit Qc LDO2 2mA Charger Control OCP Over-Temp Limit OTP Timer CM9112 0.03 OVP & ADOK Qc / 1000 Current Mirror LDO1 450mA S/D 4.2V Qb VSYS VREF VOUT BSEN ENA ISET1 THERM STAT2 STAT1 © 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 07/06/06

R 500 I 4.75V<VAD<6.5V Set Precharge Mode STAT1=STAT2=ON Start Timeout 1 Tj > 150oC Iin > 1.5A Shut down LDO, VREF, Stop charging and Latch ; Set STAT1=STAT2=OFF Connect VSYS with Battery through external Q 2 ENA = High Yes BSEN > 3.3V Yes Charge time > Timeout 1 Stop Charging Set STAT1=STAT2=OFF Yes Precharge Mode No No Set CC mode STAT1=ON, STAT2=OFF CC Mode BSEN >= 4.200V No Set CV Mode Reset Timeout 2 CV Mode No Yes BSEN < 4.200V-100mV OTP OCP Yes Standby Mode No Timer Fault Battery hot, cold or removed Charge time > Timeout 2 Stop charging and Latch. Set STAT1=STAT2=OFF Charge Done or Battery is not present VIN < BSEN Shut down LDO1 , VREF, Stop Charging Connect VSYS with Battery through external Q2 Yes Sleep mode Shutdown mode USB > 4.5V No No Yes Yes Yes Yes No No Battery Temperature Checking No Precharge in progress Fast charge in progress Charge done STAT2 STAT1 ON ON OFF ON OFF ON Timer fault Sleep mode OFF OFF OFF OFF CHARGE STATE ADOK=0 ADOK=1 ADOK=1 Yes ADOK=1 Start Timeout 1; VSYS=4.2V/500mA ISET2 VOUT R 500 I ADOK=1 ISET2 VOUT R 500 I Start Timeout 2 Yes ISET1 VOUT <= R 120 I No No Yes ISET2 VOUT<= R 120 I ISET1 VOUT R 500 I No Yes ADOK=1 Yes Stop charging Stop Timeout 2; Set STAT1=OFF STAT2=ON No Stop charging Set STAT1=OFF, STAT2=OFF ENA has no effects of VSYS output 2.5V<THERM <4.375V Note: If Therm is used, during any charging mode, removing a battery will cause the CV mode, then termination, the equivalent to charge done. Until the battery is returned, the charger will cycle between standby mode and re-charge cycle. © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

Application Information

The CM9112 is an integrated charger with a charging profile tailored for single-cell graphite electrode (anode) Li-ion batteries. This linear charger can be powered from either an AC voltage-source adapter or a USB port. When both are applied it will automatically select the AC Adaptor source. The charger features the three modes required for a safe and reliable Li-ion charging profile; Precharge, Fast-charge, and Termination charge. Extensive safety features include battery temperature monitoring, volt­ age and current monitoring and charging time limits. Two charging status indicators provide charge state information. Two different external resistors Riset1,Riset2 allow two different charging current to be programmed for either USB adaptor or AC Adaptor. This method allows an accurate control of USB input current. Under AC Adaptor input both VSYS (host system) and VOUT (battery) are simultaneously supplied with the current required by each oh them, independently. When the absolute over current limit protection is reached (1.5A), CM9112 goes into shutdown, latched mode. Under USB supply, with AC Adaptor out, CM9112 pro­ vide power only to VOUT. The total current available for VOUT is externally programmed by Riset1. USB/AC adapter dual input The CM9112 can support inputs from either a USB bus or a 5V AC wall adapter. The USB standard specifies a 5.0V +/-5% bus voltage, capable of 500mA (High Power peripheral configura­ tion) of current. Since desktop and mobile PCs are equipped with USB or USB2 connectors for interfacing with peripherals and digital consumer electronics, it is advantageous to tap the USB’s power to charge porta­ ble devices such as cell phones. When using USB input power, the CM9112 will auto­ matically select external resistor Riset1 to fix the total input current. This goes only into VOUT pin and is intended to charge the battery. However, the system is connected to the battery through a Schottky diode. This makes possible some current flowing into VOUT pin to go not only into Battery but into System too. A longer charging time will be the result of this. That’s why, under USB input, timeout for charger are disabled. When using AC Adaptor power, CM9112 will automati­ cally select the resistor Riset2 for charging current. In addition of this it will provide a free current to VSYS directly from Adaptor input through a power LDO. This will be limited to 450mA either by power dissipated on the chip, or absolute current limit. When using a constant-voltage, 5VDC nominal, AC adapter, the semi-regulated voltage to the charger, after accounting for the conduction losses through the power cord and connector contacts, is a voltage in the range of 5.0V to 6.0V. When a valid AC adapter voltage between 4.75V and 6.5V is detected on the VAD pin, an external MOSFET, Q1 is turn ON and VAD and VIN are connected together. An internal power MOSFET used for USB supply, is turned OFF, so there is no residual voltage on USB pin due to VAD supply. The same, when USB is used as input. No residual voltage in VAD pin. Charging Li-ion Batteries Once the CM9112 detects the presence of either a valid AC adapter or USB input voltage, and checks that the battery voltage at BSEN is less then VIN and that the battery temperature is within the correct range, it is ready to charge the Li-ion battery. The controller’s internal counter is reset. If the battery voltage is deeply discharged (less than 3.2V), the CM9112 will start in the Precharge mode, charging at 10% of the programmed Fast-charge cur­ rent level. See Figure 1. While the battery is charging, the status pins will be set to STAT1=0 and STAT2=0. The Precharge current will gradually bring the battery voltage to above 3.2V. If the battery does not reach the 3.2V level, indicative of a defective Li-ion cell, the CM9112 will turn off the charging process after a Pre- charge timeout period (Timeout1, 30 minutes per 0.1µF of CT capacitance). In this case, the status pins will be set to STAT1=VIN and STAT2=VIN. © 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 07/06/06

Application Information (cont’d) PD = (VIN – VOUT) × IOUT In most cases, VIN is fixed at about 5.0V (either the AC adapter or the USB power input). The CM9112 has two outputs; one for the charger and one for the system from LDO1. The total power dissipation is: PD = (5V – 4.2V ) × ISYS + (5V – VBAT ) × IFASTCHG Highest power dissipation occurs when the battery at its lowest level (3.2V), when it just starts in the Fast- charge (CC) mode. Assuming VIN = 5.0V, VBAT = 3.2V, ICC = 1A, the PD = (5V-3.2V) x 1A = 1.8W. Assuming Rth(JA) = 50°C/W, then ΔT = 1.8W x 50°C/W = 90°C. If the ambient temperature (TA) is 35°C, then the junction temperature (TJ) could reach 125°C without over-tem­ perature current foldback. With over-temperature (OT) current foldback, the CM9112 will throttle down the charging current, allow­ ing the junction temperature will reach steady-state equilibrium of 105°C, which translates into 1.4W of power dissipation, or 0.78A of charge current. As the battery voltage rises during charging, the allowable PD dissipation is increased. When the battery voltage reaches 3.6V, a full 1.0A of charging current is allowed. Dual-Level OTP and OCP In addition to chip temperature regulation at 105°C, the CM9112 provides absolute over-temperature shutdown protection. In the case of a malfunctioning charger con­ trol, high ambient temperature or an unexpectedly high IC thermal resistance, Rth(JA) (for example; due to faulty soldering of the charger IC chip), the power dissi­ pation from LDO1 alone could over-heat the device. The CM9112 provides an absolute OTP shutdown at junction temperature of 150°C. Similarly, each output, LDO1 and VOUT (ISET2), has its own current limit. ISET1 provides the total adapter current limit for adaptive charging current control. How­ ever, in case of an inoperative ISET2 setting (for exam­ ple; RISET2 becomes shorted to ground), ISET1 will function as backup over-current protection. Combining the dual-level OTP and the dual-level OCP, the CM9112 in effect provides four layers of protection against charger or VSYS over-load faults. The Need for OVP There are two primary reasons for adding an input OVP feature to the CM9112 charger. One is to protect the charger and the host system when an adapter with the wrong output voltage is plugged-in. The other is to protect the charger IC and the system against input surge voltage resulting from the ringing due to the input capacitor and an inductive adapter power cord. Almost all computer peripherals and consumer elec­ tronics use AC adapters. It is common to use an LCD monitor, a printer, a laptop computer, an ADSL or cable modem, a cell phone, an MP3 player, with all their indi­ vidual AC adapters clustered around a power strip. The output voltages of these adapters vary, yet most of these use a similar cylindrical style connector at the device interface. Thus, the chance that a user might plug-in a wrong adapter should not be taken lightly. The CM9112 provides over-voltage protection (OVP) against the plug-in of a wrong adapter, up to an output voltage of 30V. The CM9112 drives a 30V P-type power MOSFET as a disconnect switch. The propri­ etary OVP design of the CM9112 protects itself and the host system against the intermittent connection of a wrong adapter. Another source of over-voltage comes from voltage ringing that occurs when an adapter is first plugged-in, as shown in Figure 4. A long power cord from the adapter output can have an inductance of several µH, and the input capacitor of a cell phone is typically a 10µF to 100µF ceramic, with very low ESR. Unfortu­ nately, the low resistance in the power cord and the low ESR of the input capacitor provide little dampening to this LC circuit, resulting in strong ringing, with input voltage overshoot, when the adapter is first plugged-in. The ringing could apply a peak voltage twice that of the nominal adapter output voltage at the input capacitor point. The CM9112 can withstand several forms of OVP con­ ditions; DC, DC with ringing, or intermittent contact of any frequency. © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

pin to go above the window and thus stop charging. to GND will resume charging. capacitor, Ct, connected between the CT pin and GND. This capacitor is responsible for the clock cycle rate. pack should follow the 7:1 ratio on the Resistance vs. Figure 6. NTC Thermistor Interface © 2006 California Micro Devices Corp. All rights reserved.

Application Information (cont’d) A value of 0.1µF provides a 13.6ms clock cycle period, producing 30 minutes for Timeout1 (Precharge) and 60 minutes for Timeout2 (Termination),. When VIN is applied to a fully discharged battery (VBAT<3.0V), the internal counter starts counting clock cycles for Timeout1. A constant Precharge current (10% of the programmed Fast-charging current) then charges the battery. If Timeout1 elapses before the battery reaches the 3.3V threshold of the Fast-charge (CC) mode, charging stops and a Charge Suspended fault is signaled by the status pins (STAT1=STAT2=VIN). This is a latched status and charging can only resume by toggling VIN. If the battery voltage attains 3.3V before Timeout1 elapses, the internal counter is reset without any action from the charging algorithm and the battery goes into the Fast-charge mode. During the Fast-charge mode, there is no Timeout counting, and, in theory, this mode can last indefinitely. During Fast-charge, the battery could be providing cur­ rent to a load. With only part of the available charging current going into the battery, the charging time will increase and becomes unpredictable. Thus, a Timeout interval during this mode is not used, allowing greater application flexibility. Once the battery reaches the 4.20V threshold, the Ter­ mination (CV) mode begins and the charging current starts to decrease. At the same time, the internal clock starts counting again. If Timeout2 elapsed before the Termination current threshold is reached, charging stops in a latched status (STAT1=STAT2=VIN). It can resume only by toggling VIN. If the Termination thresh­ old is reached before Timeout2 has elapsed, the counter resets and the charger enters into the Standby mode. If a stop charge to the battery is triggered by Timeout1/ Timeout2, it should be noted that VSYS would continue to provide power to the Baseband load. Disabling the Timeouts To allow design flexibility for many different applica­ tions, the CM9112 allows disabling the Timeout inter­ vals as an option. If the application does not require Timeout Intervals to control Precharge and Termina­ tion, connecting the CT pin to VIN will disable the func­ tion. The charging algorithm then will be controlled only by voltage on the BSENS pin (Battery Sense Voltage). Mode Summary Precharge mode is the typical charge starting mode for pre-conditioning a deeply discharged battery (<3.3V). A constant current of 10% of the programmed Fast-charge current is applied to raise the voltage safely above 3.3V. The maximum charge time is limited to the programmed Timeout1 period. Fast-charge mode is the constant current charging mode that applies most of the battery charge. A pro­ grammed constant current is applied to bring the bat­ tery voltage to 4.2V. Termination mode is the final charging mode, where a constant voltage of 4.2V is applied to the battery until the charge current drops below 5% or the programmed Fast-charge current. The charging time is limited by the programmed Timeout2. Standby mode is entered after a successful Termina­ tion mode and charging is done. Charging stops but VSYS continue to be supplied by AC Adaptor input. In this mode, the battery is monitored, and when its volt­ age drops below the re-charge threshold (4.100v), a new charge cycle begins. Shutdown– not latched mode is triggered by a charg­ ing fault. These include THERM pin voltage outside the window (battery is too hot, too cold, or removed), or pulling ENA pin low. The charging resumes if the failure condition is removed. VSYS is still alive and supply SYSTEM with current. Shutdown– latched mode If input current, sensed internally, exceeds 1.5A (OCP), or the IC junction temperature exceeds 150°C (OTP). The shutdown happens again but this time it is latched. Only by toggling VAD/USB and removing the failure condition the CM9112 could resume the function. VSYS is no more supplied with current and an external Q2 MOSFET connect VSYS with the Battery which become the system power supplier. Timer-fault mode is entered when a Timeout ends without the battery reaching the proper threshold. Charging stops and remains stopped until VIN is tog­ gled. VSYS will continue to receive power through LDO1. © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

(588 µs pulse width, at a duty cycle of 1/8). typical configuration in Figure 7. between a cell phone and a PC.

1. In normal battery operation, Q2 is turned
2. GSM transmitter requires up to 2.0A of

Figure 7. GSM phone application © 2006 California Micro Devices Corp. All rights reserved.

Application Information (cont’d) occur when LDO1 is disabled and the battery must supply full system load. PQ2 = Isys 2 ⋅RDS The Q2 and PCB heatsink must be rated for this power. Layout Considerations Because the internal thermal foldback circuit will limit the current when the IC reaches 105°C it is important to keep a good thermal interface between the IC and the PC board. It is critical that the exposed metal on the backside of the CM9112 be soldered to the PCB ground. The Cu pad should is large and thick enough to provided good thermal spreading. Thermal vias to other Cu layers provide improved thermal perfor­ mance. VIN, VSYS and VOUT are high current paths and the traces should be sized appropriately for the maximum current to avoid voltage drops. BSEN is the battery feedback voltage and should be connected with its trace as close to the battery as possible. © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

TQFN-16 Mechanical Specifications The CM9112-00QE is supplied in a 16-lead, 4.0mm x 4.0mm TQFN package. Dimensions are presented below. For complete information on the TQFN16, see the Cal­ ifornia Micro Devices TQFN Package Information doc­ ument. PACKAGE DIMENSIONS Package TQFN-16 (4x4) Leads Dim. Millimeters Inches Min Nom Max Min Nom Max A 0.07 0.75 0.80 0.28 0.030 0.031 0.00 0.05 0.00 0.002

0.20 REF

.008 b 0.25 0.30 0.35 0.010 0.012 0.014 D 3.90 4.00 4.10 0.154 0.157 0.161

1.95 REF

0.077 2.00 2.10 2.20 0.079 0.083 0.087 E 3.90 4.00 4.10 0.154 0.157 0.161 0.077 2.00 2.10 2.20 0.079 0.083 0.087 e 0.65 TYP. 0.026 L 0.45 0.55 0.65 0.018 0.022 0.026 # per tape and reel 3000 pieces Controlling dimension: millimeters Mechanical Package Diagrams 0.10 C 0.08 C SIDE VIEW D E BOTTOM VIEW TOP VIEW e b 0.10 16X DAP SIZE 1.8 X 1.8 Pin 1 Marking 0.15 0.15 C A M A C C L B Package Dimensions for 16-Lead TQFN © 2006 California Micro Devices Corp. All rights reserved. 07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com