AAT3125 USB OTG 5V Charge Pump General Description Features The AAT3125 USB On-the-Go (OTG) charge pump is a member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family. The device integrates a high efficiency 1.5X fractional 100mA regulated charge pump for supplying VBUS with the additional functions required for OTG devices (formerly known as dual role devices). Four voltage detectors monitor VBUS, and a current source dedicated for VBUS pulsing is provided for compliance with Session Request Protocol (SRP) as defined by the USB OTG Supplement. • • • • • • • • • • • The charge pump section uses a high efficiency fractional topology, with a high frequency 750kHz switching speed which enables the use of small capacitors (less than 3.3µF). The AAT3125 features extremely low quiescent current to extend battery run time. Additionally, the device integrates protection features such as under-voltage lockout, and output short circuit and thermal protection. • • ChargePump™ VIN Range: 2.7V to 5.5V Regulated Fractional Charge Pump 100mA Output Current Reverse Load Protection Power Good Flag SRP Detection Flag SRP Ready Flag Output Short-Circuit and Thermal Protection Under-Voltage Protection Less than 1µA Consumed While Disabled Designed to Allow Operation with Output Capacitance as Low as 3.3µF 16-pin QFN44 Package -40°C to +85°C Temperature Range Applications • • • The AAT3125 is available in a Pb-free, surface mount QFN44-16 package and is rated over the -40°C to +85°C temperature range. Cell Phones Hand-Held Computers PDAs Typical Application IN 1 Cell Li-Ion AAT3125 CIN C1+ 1µF C1- C1 1µF VBUS COUT OUT RCS 80kΩ 3.3µF to 6.5µF 0.2Ω OUTCP CCP C2+ 1µF C2R1 C2 1µF R3 R4 POK1 POK1 POK2 SR SR POK2 EN EN SESDET SESDET SRRDY SRRDY GND 3125.2005.12.1.4 R2 1 AAT3125 USB OTG 5V Charge Pump Pin Descriptions Pin # Symbol 1 POK1 2 POK2 3 SESDET 4 SRRDY 5 6 7 8, 13 9 10 11 12 14 15 OUT C1+ C1N/C OUTCP C2+ C2GND VIN SR 16 EN EP Function Power OK 1. Open drain output with 4.0V voltage detector. When the OUT pin rises above the detected voltage (4.0V), POK1 will transition from low to high state. Similarly, when the output falls below 4.0V, POK1 will transition from high to low. A 10kΩ pull-up resistor is recommended. Power OK 2. Open drain output with 4.4V voltage detector. When the OUT pin rises above the detected voltage (4.4V), POK2 will transition from low to high state. Similarly, when the output falls below 4.4V, POK2 will transition from high to low. A 10kΩ pull-up resistor is recommended. Session detect. Open drain output with 2.0V voltage detector. When the OUT pin rises above the detected voltage (2.0V), it will transition from low to high state. Similarly, when the output falls below 2.0V, SESDET will transition from high to low. A 10kΩ pull-up resistor is recommended. Session request ready. Open drain output with 0.6V voltage detector. When the OUT pin rises above the detected voltage (0.6V), it will transition from low to high state. Similarly, when the output falls below 0.6V, SRRDY will transition from high to low. A 10kΩ pull-up resistor is recommended. Power output to VBUS. Flying capacitor 1 positive terminal. Flying capacitor 1 negative terminal. No connect. Charge pump output. Requires 1µF bypass capacitor to ground. Flying capacitor 2 positive terminal. Flying capacitor 2 negative terminal. Ground. Input power supply. Requires 1µF bypass capacitor to ground. Session request input control pin. Should not be left floating. Must connect to high or low. For more details, see Table 1. Enable input control pin. When in the low state, the AAT3125 is powered down and consumes a small amount of power. When connected high, it is in normal operation. This pin should not be left floating. For more details, see Table 1. Exposed paddle (bottom); connect to GND directly beneath package. Pin Configuration QFN44-16 (Top View) 15 13 16 14 SR 1 12 GND POK2 2 11 C2- SESDET 3 10 C2+ SRRDY 4 9 OUTCP 8 7 6 5 N/C C1- C1+ OUT 2 N/C VIN EN POK1 3125.2005.12.1.4 AAT3125 USB OTG 5V Charge Pump Absolute Maximum Ratings1 Symbol Description VIN, VOUT tSC IOUT2 TJ TS VESD Any Pin to GND OUT Short-Circuit Duration Output Current Operating Temperature Range Storage Temperature Range ESD Rating3 - HBM Value Units -0.3 to 6 Indefinite 150 -40 to 85 -65 to 150 2000 V s mA °C °C V Value Units 50 2.0 °C/W W Thermal Information Symbol θJA PD Description 4 Maximum Thermal Resistance Maximum Power Dissipation (TA = 25°C)5 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Based on long-term current density limitation. 3. Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. 4. Mounted on an FR4 board. 5. Derate 20mW/°C above 25°C. 3125.2005.12.1.4 3 AAT3125 USB OTG 5V Charge Pump Electrical Characteristics1 VIN = 3.5V; CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C. Unless otherwise noted, typical values are TA = 25°C. Symbol Input Power Supply VIN Operating Range Icc3 Icc2 Icc1 Icc0 Output Power Supply VOUT ICCOUT Description Conditions Min Operating Current SRP Operating Current CP Shutdown Current 1 Shutdown Current 0 EN EN EN EN Output Regulation Operating Current IOUT = 0 EN = 0 3.2 ≤ VIN ≤ 5.5V, VOUT > 4.4V 3.35 ≤ VIN ≤ 5.5V, VOUT > 4.4V VCS = IOUT x RCS EN = 0, SR = 1 OUT < (IN-1.0v) Typ Max Units 60 1 1 5.5 110 3 2 1 V µA mA µA µA 5.25 12 V µA 2.9 IOUT Output Current VCS ROFF ISR Charge Pump η TSS FCLK EN, SR VIL VIH IEN(SINK) ISR(SINK) POK1 VPOK1 VPOK1(HYS) VPOK1(OL) IPOK1 POK2 VPOK2 VPOK2(HYS) VPOK2(OL) IPOK2 Current Sense Trip Level Pull-Down Resistance SR Current Pulse Efficiency Soft-Start Time Clock Frequency Input Threshold Low Input Threshold High EN Input Current SR Input Current POK Trip Threshold POK Hysteresis POK Output Voltage POK Leakage Current POK Trip Threshold POK Hysteresis POK Output Voltage POK Leakage Current = = = = 1, 1, 0, 0, SR SR SR SR = = = = 1, OUT = IN 0 1 0 4.6 50 40 700 5 VIN = 3.75V, IOUT = 50mA OUT < 0.1 to OUT > 4.4 7 65 100 60 1000 10 mA 90 1500 20 90 100 750 % µs kHz 0.4 VIN = VEN = 5.5V VIN = VSR = 5.5V 1.4 -1 -1 VOUT Rising 3.8 1 1 4.0 50 ISINK = 1mA VPOK = 5.5, 25°C VOUT Rising ISINK = 1mA VPOK = 5.5, 25°C 4.2 0.3 100 4.18 4.4 50 mV Ω mA 4.62 0.3 100 V V µA µA V mV V nA V mV V nA 1. The AAT3125 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 4 3125.2005.12.1.4 AAT3125 USB OTG 5V Charge Pump Electrical Characteristics1 VIN = 3.5V; CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C. Unless otherwise noted, typical values are TA = 25°C. Symbol SESDET VSD VSD(HYS) VSD(OL) ISD SRRDY VSRRDY VSRRDY(HYS) VSRRDY(OL) ISRRDY Description Conditions Min Typ Max Units SD Trip Threshold SD Hysteresis SD Output Voltage SD Leakage Current VOUT Rising 1.9 2.0 50 2.1 V mV V nA SRRDY Trip Threshold SRRDY Hysteresis SRRDY Output Voltage SRRDY Leakage Current ISINK = 1mA VSD = 5.5, 25°C 0.3 100 VOUT Rising 0.4 0.6 20 ISINK = 1mA VSRRDY = 5.5, 25°C 0.8 0.3 100 V mV V nA EN SR Charge Pump Current Source SRRDY POK SESDET Discharge Resistor 1 1 0 0 0 1 0 1 ON OFF OFF OFF OFF ON OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON ON ON OFF OFF OFF ON Table 1: Operational States. 1. The AAT3125 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 3125.2005.12.1.4 5 AAT3125 USB OTG 5V Charge Pump Typical Characteristics Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C. Charge Pump ON/OFF Timing Efficiency vs. Load Current 100 VIN = 3.4V 90 OUT (1V/div) Efficiency (%) 80 IIN (100mA/div) 70 VIN = 3.8V 60 50 40 30 20 10 EN (1V/div) 0 1 10 100 1000 Load Current (mA) Time (2ms/div) Charge Pump Waveforms Load Transient Response (10mA to 100mA) (100mA load) V (10mV/div) VOUT (100mV/div) IN OUT Time (1µs/div) Time (4ms/div) Charge Pump Output Voltage vs. Input Voltage 6 5.5 5.3 VIN = 3.9V 5.1 4.9 4.7 VIN = 3.7V 5 4 3 2 1 4.5 1 10 100 1000 0 0 Load Current (mA) 6 (ILOAD = 100mA) Output Voltage (V) Charge Pump Output Voltage (V) Charge Pump Output Voltage vs. Load Current 1 2 3 4 5 Input Voltage (V) 3125.2005.12.1.4 AAT3125 USB OTG 5V Charge Pump Typical Characteristics Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C. Operating Current vs. Input Voltage Operating Current vs. Input Voltage (EN = 1; SR = 0; Charge Pump Mode) (EN = 1; SR = 0; Outside Current Source Mode) 1.200 80 70 1.000 60 50 ICC3 (µA) ICC2 (mA) 0.800 0.600 0.400 40 30 20 0.200 10 0 0.000 0 1 2 3 4 5 0 6 1 2 3 4 5 Input Voltage (V) Input Voltage (V) ICCOUT vs. VOUT Shutdown Current vs. Input Voltage (EN = 0; SR = 1) 1.8 10 1.6 9 1.4 8 7 ICCOUT (µA) ICC1 (µA) 1.2 1.0 0.8 0.6 0.4 6 5 4 3 2 0.2 1 0.0 0 0 1 2 3 4 5 0 6 1 2 3 4 5 6 Output Voltage (V) Input Voltage (V) Charge Pump POK Timing ISR vs. VOUT (EN = 1; SR = 1) 15 OUT (5V/div) ISR (mA) EN (2V/div) VIN = 4.2V POK2 (5V/div) 10 POK1 (5V/div) VIN = 3.2V SESDET (5V/div) SRRDY (5V/div) 5 0 1 2 Output Voltage (V) 3125.2005.12.1.4 3 4 Time (100µs/div) 7 AAT3125 USB OTG 5V Charge Pump Typical Characteristics Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C. Falling SESDET Timing Rising SESDET, SRRDY Timing (120µF Load) OUT (5V/div) OUT (5V/div) EN, SR (5V/div) SESDET (5V/div) SRRDY (5V/div) EN/SR (5V/div) SESDET (5V/div) Time (10ms/div) Time (100ms/div) VBUS Pulsing for SRP VBUS Pulsing for SRP 4 4 3 3 2 2 1 1 0 0 Time (1ms/div) 8 (VBUS Rise Time; 100µ µF on VBUS) VBUS (V) VBUS (V) (VBUS Rise Time; 5µ µF on VBUS) Time (10ms/div) 3125.2005.12.1.4 AAT3125 USB OTG 5V Charge Pump Functional Block Diagram C1+ C1- C2+ C2- IN OUTCP 5V Charge Pump OC OUT 10mA POK1 SR EN 4.0 Control UVLO OTMP POK2 4.4 SESDET 2.0 SRRDY Voltage Reference 0.6 GND Functional Description Charge Pump 10mA, SESDET should rise about 7ms after SRRDY rises when an OTG device is connected. With a non-OTG device connected, this period is at least 70ms. 10mA should not damage non-SRP capable hosts that allow reverse current flow from the bus. Current is not allowed to flow from OUT to IN through the current source. The AAT3125 charge pump uses a 1.5X topology; the two flying capacitors are charged in series and discharged in parallel. Using this topology, output current is approximately 2/3 input current. Since the power bus in battery-operated devices that use a single cell lithium-ion/polymer battery ranges from 3V to 4.5V, an output voltage above 4.4V can be maintained. Output voltage is regulated to 5V and output current is limited by the value of RCS. The charge pump is designed to operate safely with any combination of input and output voltages. Current is not allowed to flow from OUT to IN. The SESDET open drain output signals the use of SRP while the system is acting as the A device. OUT powers this detector because the local 5V bus may not be powered when the B device initiates SRP. Since VBUS provides no more than 150µA to OUT, the detector consumes only 7µA. 10mA Current Source SRRDY Voltage Detector A 10mA current source supplies current to OUT for VBUS pulsing during SRP. During VBUS pulsing, the length of time needed to charge capacitance connected to OUT distinguishes between non-SRP capable devices and SRP capable devices. Using The SRRDY open drain output signals that VBUS is ready for SRP. SRRDY is powered by IN and is active as long as IN is above the UVLO level. SRRDY is true (low) when OUT is below the SRRDY threshold (0.6V nominal). SRRDY is false 3125.2005.12.1.4 SESDET MicroPower Voltage Detector 9 AAT3125 USB OTG 5V Charge Pump (open) when OUT is above the SRRDY threshold or when EN is a logic low. Upon activation by EN, there is no negative glitch that can be mistaken for OUT below 0.8V. Power OK USB OTG devices connected as Host must maintain VOUT above 4.4 volts or report that it is below 4.4 volts. Two Power OK outputs (POK1 and POK2) provide a window comparison of the VOUT voltage. The POK1 open drain output is pulled low if VOUT drops below 4.0V ± 5%, and the POK2 open drain output is pulled low if VOUT drops below 4.4V ± 5%. Under-Voltage Lockout Circuits other than the MicroPower voltage detector (SESDET) require voltage to be present on IN. Under-voltage lockout guarantees that sufficient voltage is present on IN to ensure operation. All functions other than the SESDET flag are disabled if the voltage on IN is less than 2V. Discharge Resistor In accordance with the USB OTG specification, a pull-down resistor is provided to discharge VBUS at a current of not more than 8mA. Over-Temperature Protection If the AAT3125 junction temperature exceeds 125°C, the charge pump is shut down. 10 3125.2005.12.1.4 AAT3125 USB OTG 5V Charge Pump Ordering Information Package Marking1 Part Number (Tape and Reel)2 QFN44-16 ITXYY AAT3125ISN-T1 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree. Package Information 0.330 ± 0.050 Pin 1 Identification 13 16 0.650 BSC 1 R0.030Max 4 9 8 4.000 ± 0.050 2.400 ± 0.050 5 2.280 REF Top View 0.0125 ± 0.0125 Bottom View 0.203 ± 0.025 0.900 ± 0.050 4.000 ± 0.050 Pin 1 Dot By Marking 0.450 ± 0.050 0.600 ± 0.050 QFN44-16 Side View All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3125.2005.12.1.4 11 AAT3125 USB OTG 5V Charge Pump © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 12 3125.2005.12.1.4