19-4356; Rev 0; 10/08 Battery Switch with Four Enable Inputs The MAX14525 features a low RON 35mΩ (typ) load switch with four unique enable inputs. The MAX14525 is ideal for disconnecting the lithium-ion (Li+) battery from the loads in portable devices such as cell phones. The MAX14525 operates from a +2.2V to +5.5V supply voltage. The MAX14525 features an extremely low 0.8µA (typ) quiescent supply current to maximize battery life in portable devices. It is enabled from four possible inputs: external charger connection capable of high voltage up to +28V, travel adapter (TA), on key (ON_K), factory mode enable (JIG), and switch enable (S_EN). The S_EN input is internally ANDed with the switched battery connection (IN). The MAX14525 is available in a small 8-pin, 2mm x 2mm TDFN package and operates over the -40°C to +85°C extended temperature range. Features ♦ Low 35mΩ (typ) RON Load Switch ♦ Ultra Low, 0.8µA (typ) Supply Current ♦ Four Enable Inputs: TA: +28V (max) Capable ON_K: Accurate +3V Trigger Enable JIG: Factory Mode Enable S_EN: Logically ANDed with IN ♦ Space-Saving 8-Pin, 2mm x 2mm TDFN Package ♦ Controlled Turn-On to Limit dI/dt Pulses Due to Lead Inductance Ordering Information Applications Cell Phones PDAs GPS PART PIN-PACKAGE TOP MARK MAX14525ETA+T 8 TDFN-EP* ACQ Note: The device is specified over the -40°C to +85°C operating temperature range. +Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad. UMPC Computers Digital Cameras Pin Configuration Typical Application Circuit TOP VIEW MAX14525 BAT IN CHARGER ON_K Li-ION BATTERY ON BUTTON PHONE LOADS AC ADAPTER BAT 1 JIG 2 ON_K 3 3.0V TA SLEW RATE CONTROL S_EN 4 + MAX14525 *EP 8 IN 7 IN 6 TA 5 GND 2V JIG P S_EN GND TDFN-EP 2mm x 2mm *CONNECT EXPOSED PAD TO GND. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX14525 General Description MAX14525 Battery Switch with Four Enable Inputs ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) IN, BAT, JIG, S_EN, ON_K ................................... -0.3V to +6.0V TA ...........................................................................-0.3V to +28V Continuous Power Dissipation (TA = +70°C) 8-Pin TDFN (derate 11.9 mW/°C above +70°C) .........954 mW Junction-to-Case Thermal Resistance (θJC) (Note 1) ...............................................................37°C/W Junction-to-Ambient Thermal Resistance (θJA) (Note 1) ...............................................................84°C/W Operating Temperature Range .......................... -40°C to +85°C Junction Temperature ..................................................... +150°C Storage Temperature Range ............................ -65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VBAT = +2.2V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VBAT = +3.6V and TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Input Voltage Range On-Resistance Disable Supply Current VBAT Supply Current VBAT, VIN RON 2.2 ILOAD = 100mA, VBAT = +3.0V IBAT_DIS VBAT = +5.5V (VJIG = VS_EN = VON_K = VTA = VIN = 0) IBAT VJIG = VS_EN = VBAT , VON_K = VTA = 0 Increase in Supply Current with VJIG/VS_EN Voltage ΔIBAT VJIG = VS_EN = VIH or VIL Increase in Supply Current with VON_K Voltage ΔIBAT VBAT = VON_K = +3.6V Peak Current ILIM UVLO Undervoltage Lockout VBAT = +3.6V 35 0.8 5.5 V 90 mΩ 1 µA 4.5 µA 2 µA 4.5 µA 5 A Ramping VBAT 1.9 V 2.5 V 180 kΩ LOGIC INPUT TA Threshold Voltage VTA_TH 1.15 1.7 50 100 TA Threshold Hysteresis 1% TA Input Resistance VTA = 1V JIG, S_EN Input Logic-High VIH JIG, S_EN Input Logic-Low VIL JIG, S_EN Input Leakage Current IIN IN AND Gate Threshold Voltage ON_K Threshold Voltage ON_K Threshold Hysteresis 2 1.4 VBAT = +5.5V VIN_TH VON_K_TH Low-to-high transition (Figure 1) V 0.4 V -200 +200 nA 0.3 x VBAT 0.6 x VBAT V 3.06 V 2.94 3.0 1% _______________________________________________________________________________________ Battery Switch with Four Enable Inputs (VBAT = +2.2V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VBAT = +3.6V and TA = +25°C.) (Note 2) PARAMETER SYMBOL ON_K Input Leakage Current ION_K CONDITIONS MIN TYP MAX UNITS 3 µA 600 2600 µs 1800 5000 µs VBAT = VON_K = +3.6V SWITCH DYNAMICS (RL = 20Ω, CL = 0.1µF) (Figure 2) Turn-On Delay Time tONDLY From any enable high to VIN = 10% of VBAT Turn-On Rise Time tONRISE VIN 10% to 90% of VBAT Turn-Off Delay Time tOFFDLY From any enable low to VIN = 90% of VBAT 130 300 µs Turn-Off Fall Time tOFFFALL VIN 90% to 10% of VBAT 60 150 µs 500 Note 2: Devices are tested at TA = +25°C. Specifications over temperature are guaranteed by design. Typical Operating Characteristics (VIN = +3.6V, TA = +25°C, unless otherwise noted.) NORMALIZED RON vs. VIN 1.6 1.0 0.9 1.2 1.0 0.8 0.8 0.6 0.7 0.4 0.5 4.4 TA = +85°C 1.50 1.00 0 -40 5.5 1.75 -15 VIN (V) 10 35 60 2.2 85 3.3 ON_K THRESHOLD vs. VIN TA = +25°C TA = +85°C 2.995 TA = -40°C TA = -40°C 1.15 S_EN THRESHOLD (V) 3.005 3.000 5.5 S_EN THRESHOLD vs. VIN 1.25 MAX14525 toc04 3.010 4.4 VIN (V) TEMPERATURE (°C) MAX14525 toc05 3.3 ON_K THRESHOLD (V) 2.2 TA = -40°C TA = +25°C 2.00 1.25 IL = 100mA VBAT = +3.0V 0.2 IL = 100mA 2.25 TA THRESHOLD (V) NORMALIZED RON 1.1 1.4 MAX14525 toc03 1.8 1.2 2.50 MAX14525 toc02 1.3 NORMALIZED RON 2.0 MAX14525 toc01 1.4 0.6 TA THRESHOLD vs. VIN NORMALIZED RON vs. TEMPERATURE 1.5 1.05 0.95 TA = +25°C 0.85 TA = +85°C 0.75 2.990 2.2 3.3 4.4 VIN (V) 5.5 2.2 3.3 4.4 5.5 VIN (V) _______________________________________________________________________________________ 3 MAX14525 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VIN = +3.6V, TA = +25°C, unless otherwise noted.) BAT CURRENT vs. VOLTAGE TURN-ON DELAY vs. VIN TURN-ON TIME vs. VIN 2.1 1.4 TA = +85°C 0.7 800 0 3.2 TA = +85°C TA = +25°C 600 400 4.4 5.5 TA = +25°C 3.3 4.4 2.2 5.5 3.3 TURN-OFF TIME vs. VIN TURN-OFF DELAY vs. VIN 80 MAX14525 toc09 TA = +85°C 72 TURN-OFF DELAY (μs) 160 140 TA = +25°C TA = -40°C 4.4 VIN (V) VIN (V) 120 TA = +85°C 64 TA = +25°C 56 TA = -40°C 48 RL = 20Ω CL = 0.1μF 80 RL = 20Ω CL = 0.1μF 40 2.2 3.3 4.4 5.5 2.2 3.3 VIN (V) 4.4 5.5 VIN (V) TURN-ON RESPONSE TURN-OFF RESPONSE MAX14525 toc11 MAX14525 toc12 VJIG 1V/div VIN 1V/div VJIG 1V/div VBAT = +3.6V CL = 0.1μF RL = 20Ω 400μs/div 4 RL = 20Ω CL = 0.1μF 0 2.2 180 TURN-OFF TIME (μs) TA = -40°C TA = -40°C VBAT (V) 100 1.6 MAX14525 toc10 3.3 TA = +85°C 2.4 0.8 RL = 20Ω CL = 0.1μF 200 2.2 MAX14525 toc08 1000 TURN-ON TIME (μs) TA = +25°C TURN-ON DELAY (ms) TA = -40°C 2.8 4.0 MAX14525 toc07 1200 MAX14525 toc06 3.5 IBAT (μA) MAX14525 Battery Switch with Four Enable Inputs VBAT = +3.6V CL = 0.1μF RL = 20Ω VIN 1V/div 400μs/div _______________________________________________________________________________________ 5.5 Battery Switch with Four Enable Inputs ON MAX14525 OFF OFF ON_K INPUT DETECTOR THRESHOLD A HYSTERESIS B RELEASED THRESHOLD VBAT IN GND Figure 1. ON_K Input Operation Diagram VIN 90% VBAT 10% VBAT TIME VJIG VON_K VTA VS_EN tOFFDLY tONDLY tONRISE TIME tOFFFALL Figure 2. Turn-On Delay Time, Turn-On Rise Time, Turn-Off Delay Time, and Turn-Off Fall Time _______________________________________________________________________________________ 5 Battery Switch with Four Enable Inputs MAX14525 Pin Description PIN NAME FUNCTION 1 BAT Lithium-Ion (Li+) Battery Connection 2 JIG Enable Input with Standard Logic Threshold 3 ON_K Enable Input with Accurate Threshold (+3.0V) 4 S_EN Enable Input with Standard Logic Threshold Logically ANDed with IN 5 GND 6 TA Enable Input with High Threshold 7, 8 IN Power Switch Input. The power switch input voltage range is from +2.2V to +5.5V. Connect a 0.1µF capacitor from IN to GND. Connect pins 7 and 8 together for proper operation. — EP Exposed Pad. Connect EP to ground. Do not use EP as the only ground connection. Ground Detailed Description The MAX14525 features a low 35mΩ (typ) RON load switch with four unique enable inputs. The MAX14525 can be used to disconnect the lithium-ion battery from the loads in portable devices such as cell phones. It operates from a +2.2V to +5.5V supply voltage. The MAX14525 features an ultra-low 0.8µA (typ) quiescent supply current to maximize battery life in portable devices. The device is enabled from four possible inputs: external charge connection travel adapter (TA), on key (ON_K), factory mode enable (JIG), and switch enable (S_EN). The S_EN input is internally ANDed with the switched battery connection (IN). TA Input The TA input on the MAX14525 can be connected directly to the external charger source. The TA input is high-voltage capable (+28V max) and features a high threshold voltage to limit false voltage trips, and an input resistance of 100kΩ (typ) to ground. ON_K Input The ON_K line is active high and is pulled up to the lithium-ion battery through a momentary push button switch. This input features an accurate voltage detector threshold which does not enable the load switch 6 until the battery threshold is above +3.0V ±2%. When the battery has a very low charge and the on key is pressed, the accurate threshold does not allow the phone to boot up. JIG Input The JIG input on the MAX14525 is a logic-level input (+1.8V compatible) from an external source to indicate the device has been connected to a factory cable. This signal requires a standard logic-input threshold voltage (+1.4V high). S_EN Input The S_EN input on the MAX14525 is a logic-level input (+1.8V compatible) from an external source used to hold the switch on when the triggering condition (TA, ON_K, or JIG) is removed. The standard logic threshold voltage comes from the host microprocessor that pulls S_EN high once the code has begun running on the microprocessor. The S_EN input is internally ANDed with the voltage on IN. The IN connection to the AND gate thresholds are standard CMOS values of 1/3 and 2/3 of VBAT. Chip Information PROCESS: CMOS _______________________________________________________________________________________ Battery Switch with Four Enable Inputs PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 8 TDFN-EP T822+2 21-0168 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX14525 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.