PI5USB2549 PERICOM | Alldatasheet
Document overview
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Technical content
Features
Supports DCP Modes per USB Battery Charging Specification 1.2 Supports Shorted Mode per Chinese Telecommunication Industry Standard YD/T1591-2009 Supports non-BC1.2 Charging Modes by Automatic Selection Divider-1A mode Divider-2A mode Divider-2.4A mode (with MODE_SEL=’HIGH’ only) DCP-1.2V mode Integrated 65-mΩ (Typ.) High-Side MOSFET Programmable Current Limit up to 3A (Typ.) Accurate +/-7% Current Limit at 2.51A (Typ.) Provides /STATUS Pin for Plug-In Detection Operating Range:4.5V to 5.5V Device Package: EP-SOP8L
Description
The PI5USB 2549 is a USB charging port controller and current limiting power switch. PI5USB 2549 provides the electrical signatures on D+/D – to support different charging schemes and is compatib le with both popular BC1.2 compliant and non-BC1.2 compliant devices. The PI 5USB2549 65-mΩ power -distribution switch is intended for applications where heavy capacitive loads and short-circuits are likely to be encountered. Programmable current threshold provides flexibility for setting current limit . PI5USB2549 provides a /STATUS pin for plug -in detect indication.
Applications
Vehicle USB Power Charger AC-DC Wall Adapter with USB Port Other USB Charger Pin Configuration Typical Application Diagram COUT CIN PI5USB2549 18.7k (2.68A) Peripheral Device Charging IN STATUS MODE_SEL OUT DM_IN DP_IN GND ILIM VBUS GND VIN Low 2A High 2.4A EP-SOP8L Exposed PAD
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch Pin Description Pin # Name Type Description 1 ILIM I External resistor connection used to set the current-limit threshold. 2 IN P Input voltage and supply voltage; connect 0.1μF//10μF or greater ceramic capacitor from IN to GND as close to the device as possible STATUS O Active-low open-drain output as a plug-in detect indication. It is asserted when there is a load connected.
4 MODE_SEL I
Logic-level input signal used to control the Divider-2.4A charging mode. MODE_SEL=’HIGH’ enables Divider -2.4A charging mode. MODE_SEL=’LOW’ disables Divider-2.4A charging mode.
5 DP_IN I/O Connected to the D+ line of USB connector, provide the correct voltage with attached
portable equipment for DCP detection.
6 DM_IN I/O Connected to the D- line of USB connector, provide the correct voltage with attached
portable equipment for DCP detection.
7 OUT P Power-switch output
8 GND G Ground connection
Exposed PAD G Ground connection. * I = Input; O = Output; P = Power; G = Ground PI5USB2549 Charging Detection Supports Table Part Number MODE_SEL Non- BC1.2 Charging Mode Plug-in Detection DCP-1.2V Divider-1A Divider-2A Divider-2.4A
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch Maximum Ratings Recommended Operating Conditions Symbol Parameter Min. Typ. Max. Unit VIN Input Voltage, IN 4.5 - 5.5 V Input Voltage, logic-level MODE_SEL input 0 - 5.5 V VDP_I N DP_IN data line voltage 0 - VIN V VDM_I N DM_IN data line voltage 0 - VIN V VIH High-level input voltage, MODE_SEL 1.8 - - V VIL Low-level input voltage, MODE_SEL - - 0.8 V IOUT Continuous output current, OUT 0 - 2.5 A Continuous output sink current, /STATUS 0 - 10 mA RILI M Current-limit set resistor 16.9 - 750 kΩ TA Ambient Temperature Range -40 - 85 ºC TJ Operating Virtual Junction Temperature Range -40 - 125 ºC Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of thi s specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch
Electrical Characteristics
4.5V≤VIN≤5.5V; TJ=-40° C to +125° C; R/STATUS=10kΩ RILIM=20kΩ Positive currents are into pins. Typical values are at 25° C. All voltages are with respect to GND. unless otherwise specified. Symbol Parameter Test Conditions Min Typ. Max Unit Power Switch RDS(on) On Resistance(1) TJ = 25oC, IOUT = 2A - 65 - mΩ -40oC ≤ TJ ≤ 85oC, IOUT = 2A - 65 105 -40oC ≤ TJ ≤ 125oC, IOUT = 2A - 65 120 Discharge RDCHG OUT discharge resistance VOUT = 4V - 500 - Ω tDCHG OUT discharge hold time Time VOUT< 0.7V 1.30 2.0 2.9 s MODE_SEL input Input pin rising logic threshold voltage - 1 1.35 1.70 V Input pin falling logic threshold voltage - 0.85 1.15 1.45 V Hysteresis(2) - - 200 - mV Input current Pin voltage= 0V to 5.5V -0.5 - 0.5 µA (1) Pulse-testing techniques maintain junction temperature close to ambient temperature; Thermal effects must be taken into account separately (2) These parameters are provided for reference only and do not constitute part of Pericom's published device specifications for purposes of Pericom's product warranty
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch 4.5V≤VIN≤5.5V; TJ=-40° C to +125° C; R/STATUS=10kΩ RILIM=20kΩ Positive currents are into pins. Typical values are at 25° C. All voltages are with respect to GND. unless otherwise specified. Symbol Description Test Conditions Min. Typ. Max. Unit ILIM Current Limit IOS OUT Current-limit(2) RILIM=210kΩ 205 240 275 mA RILIM=80.6kΩ 575 625 680 RILIM=22.1kΩ 2120 2275 2430 RILIM=20kΩ 2340 2510 2685 VIN RILIM=16.9kΩ 2770 2970 3170 tIOS Response time to OUT short circuit(1) VIN = 5.0V, R=0.1Ω, lead length=2” - 1.5 - s Supply Current IIN_ON IN supply current - 215 270 A Undervoltage Lockout VUVLO IN rising UVLO threshold voltage - 3.9 4.1 4.3 V Hysteresis(1) - - 100 - mV /STATUS VOL Output low voltage I/STATUS = 1mA - - 100 mV IOFF Off-state leakage V/STATUS = 5.5V - - 1 A Thermal Shutdown OTSD Thermal shutdown threshold - 170 - °C Hysteresis(1) - - 20 - Note: (1) These parameters are provided for reference only and do not constitute part of Pericom's published device specifications for purposes of Pericom's product warranty (2) Pulse-testing techniques maintain junction temperature close to ambient temperature; current limit value tested at 80% output voltage. Thermal effects must be taken into account separately.
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch Electrical Characteristics, Charging Controller 4.5V≤VIN≤5.5V; TJ=-40° C to +125° C; R/STATUS=10kΩ RILIM=20kΩ Positive currents are into pins. Typical values are at 25° C. All voltages are with respect to GND. unless otherwise specified. Symbol Description Test Conditions Min. Typ. Max. Unit SHORTED MODE (BC1.2 DCP) DP_IN/DM_IN shorting resistance - 125 - Ω DCP-1.2V MODE DP_IN/DM_IN output voltage Apply 3V on DP_IN for 0.5s and measure the D+/D- voltage within the 2s - 1.25 - V DP_IN/DM_IN output impedance - 75 - kΩ DIVIDER-1A MODE DP_IN Divider-1A output voltage 1.9 2.0 2.1 V DM_IN Divider-1A output voltage 2.57 2.7 2.84 V DP_IN/DM_IN output impedance 7.5 10.5 16 kΩ DIVIDER-2A MODE DP_IN Divider-2A output voltage IOUT= 1A 2.57 2.7 2.84 V DM_IN Divider-2A output voltage 1.9 2.0 2.1 V DP_IN/DM_IN output impedance 7.5 10.5 16 kΩ DIVIDER-2.4A MODE (with MODE_SEL=’HIGH’) DP_IN/DM_IN output voltage IOUT = 2A 2.57 2.7 2.84 V DP_IN/DM_IN output impedance 7.5 10.5 16 kΩ PLUG-IN LOAD DETECT IPLUG_IN IPLUG_IN rising set current threshold - 55 - mA IPLUG_IN falling reset current threshold - 45 - mA TPLUG_IN_ SET Plug-in detect set time 140 200 275 ms Plug-in detect reset time 1.9 3 4.2 s Note: (1) These parameters are provided for reference only and do not constitute part of Pericom's published device specifications for purposes of Pericom's product warranty.
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch Functional Description PI5USB2549 Block Diagram IN ILIM Current Limit Select Current Limit Charger Pump UVLO Thermal Sense OTSD UVLO+Dischager OUT GND DP_IN DM_IN DCP Detection Divider Modes Auto Detection OC STATUS Driver MODE_SEL OC
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch Overview The following overview references various industry standards. It is always recommended to consult the most up -to-date standard to ensure the most recent and accurate information. Rechargeable portable equipment requires an external power source to charge its batteries. USB ports are a convenient location for charging because of an available 5V power source. Universally accepted standards are require d to make sure host and client -side devices operate together in a system to ensure power management requirements are met. Traditionally, host ports following the USB 2.0 specification must provide at least 500mA to downstream client -side devices. Because m ultiple USB devices can be attached to a single USB port through a bus - powered hub, it is the responsibility of the client -side device to negotiate its power allotment from the host to ensure the total current draw does not exceed 500mA. In general, each U SB device is granted 100mA and may request more current in 100mA unit steps up to 500mA. The host may grant or deny based on the available current. A USB 3.0 host port not only provides higher data rate than USB 2.0 port but also raises the unit load from 100mA to 150mA. It is also required to provide a minimum current of 900mA to downstream client-side devices. Additionally, the success of USB has made the mini -USB connector a popular choice for wall adapter cables. This allows a portable device to charge from both a wall adapter and USB port with only one connector. As USB charging has gained popularity, the 500mA minimum defined by USB 2.0 or 900mA for USB 3.0 has become insufficient for many handset and personal media players which need a higher chargin g rate. Wall adapters can provide much more current than 500mA/900mA. Several new standards have been introduced defining protocol handshaking methods that allow host and client devices to acknowledge and draw additional current beyond the 500mA/900mA mini mum defined by USB 2.0/3.0 while still using a single micro -USB input connector. The PI5USB254 9 supports four of the most common USB charging schemes found in popular hand-held media and cellular devices: USB Battery Charging Specification BC1.2 Chinese Telecommunications Industry Standard YD/T 1591-2009 Divider-1A, Divider-2A and Divider-2.4A Mode DCP-1.2V Mode YD/T 1591-2009 is a subset of BC1.2 spec. supported by vast majority of devices that implement USB cha rging. Divider-1A, Divider-2A, Divider -2.4A and DCP-1.2V charging schemes are supported in devices from specific yet popular device makers.
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch DCP-1.2V Charging Scheme DCP-1.2V charging scheme is used by some handheld devices to enable fast charging at 2.0A. PI5USB2549 supports this scheme in the DCP-Auto mode before the device enters BC1.2 shorted mode. To simulate this charging scheme D+/D - lines are shorted and pulled -up to 1.2V for fixed duration then device moves to DCP shorted mode as defined in BC1.2 spec. This i s shown as Figure 3. Figure 4, DCP-1.2V Charging Scheme Output Discharge To allow a charging port to renegotiate current with a portable device, PI5USB2549 uses the OUT discharge function. It proceeds by turning off the power switch while discharging OUT, then turning back on the power switch to reassert the OUT voltage. Over-Current Protection When an over -current condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Two possible overload conditions can occur. In the first condition, the output has been shorted before the devic e is enabled or before VIN has been applied. The PI5USB2549 senses the short and immediately switches into a constant -current output. In the second condition, a short or an overload occurs while the device is enabled. At the instant the overload occur s, high currents may flow for nominally one to two microseconds before the current-limit circuit can react. The device operates in constant-current mode after the current-limit circuit has responded. Complete shutdown occurs only if the fault is presented long enough to activate thermal limiting. The device will remain off until the junction temperature cools approximately 20° C and will then re-start. The device will continue to cycle on/off until the over-current condition is removed. GND USB Connector 2.0V 1.2V 2.7V Auto Detect PI5USB2549 VBUS
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch Current-Limit Setting The PI5USB2549 has an independent current limit setting that is programmed externally with a resistor. The ILIM setting is programmed with RILIM connected between ILIM and GND. The following equation programs the typical current limit: IOS_TYP (mA)=50250/RLIM (kΩ) Many applications require that the current limit meet specific tolerance limits. When designing to these tolerance limits, both the tolerance of the PI5USB2549 current limit and the tolerance of the external programming resistor must be taken into account. The following equations approximate the PI5USB2549 minimum / maximum current limits to within a few mA and are appropriate for design purposes. These equations assume an ideal – no variation - external programming resistor. To take resistor tolerance into account, first determine the minimum /maximum resistor values based on its tolerance specifications and use these values in the equations. Because of the inverse relation between the current limit and the programming resistor, use the maximum resistor value in the IOS_MIN equation and the minimum resistor value in the IOS_MAX equation. IOS_MIN (mA)=45271/(RLIM (kΩ))0.98437-30 IOS_MAX (mA) =55325/ (RLIM (kΩ)) 1.0139+30 The traces routing the R ILIMI resistor should be a sufficiently low resistance as to not affect the current -limit accuracy. The ground connection for the R ILIM resistor is also very important. The resistors need to reference back to the PI5USB 2549 GND pin. Follow normal board layout p ractices to ensure that current flow from other parts of the board does not impact the ground potential between the resistors and the PI5USB2549 GND pin. Undervoltage Lockout (UVLO) The undervoltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO turn on threshold. Built-in hysteresis prevents unwanted oscillations on the output due to input voltage drop from large current surges. Thermal Sense The PI5USB2549 protects itself with thermal sensing circuit that monitor the operating temperature of the power distribution switch and disables operation if the temperature exceeds recommended operating conditions. The device operates in constant - current mode during an over -current condition, which increases the voltage drop across power switch. The power dissipation in the package is proportional to the voltage drop across the power switch, so the junction temperature rises during an over -current condition. The thermal sensor turns off the power switch when the die tem perature exceeds 1 35° C regardless of whether the power switch is in current limit. Hysteresis is built into thermal sensor, and the switch turns on after the device has coole d by approximately 20° C. The switch continues to cycle off and on until the fault is removed.
Application Information
Input and Output Capacitance Input and output capacitance improves the performance of the device; the actual capacitance should be optimized for the particular application. For all applications, a 0.1uF or greater ceramic bypass capacitor between IN and GND is recommended as close to the device as possible for local noise decoupling. This precaution reduces ringing on the input due to power-supply transients. Additional input capacitance 10uF or greater may be needed on the input to reduce voltage overshoot from exceeding the absolute- maximum voltage of the device during heavy transient conditions or output shorting. Normally suggested the distance between IC and DC supply is less than 15cm. Output capacitance also needs to be close to IC as possible. When large transient currents are expected on the output, placing a high-value low ESR electrolytic capacitor 100uF or greater on the output pin is recommended.
All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch Mechanical Information EP-SOP8L
Ordering Information
Part No. Package Code Package PI5USB2549WAE WA Lead free and Green 8-pin EP-SOP Note: E = Pb-free and Green Adding X Suffix= Tape/Reel Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.