MAX14525

19-4356; Rev 0; 10/08 Battery Switch with Four Enable Inputs General Description 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. ♦ 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 Features MAX14525 Applications Cell Phones PDAs GPS UMPC Computers Digital Cameras PART MAX14525ETA+T Ordering Information PIN-PACKAGE 8 TDFN-EP* TOP MARK 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. Typical Application Circuit TOP VIEW Pin Configuration BAT Li-ION BATTERY ON BUTTON ON_K MAX14525 IN CHARGER AC ADAPTER PHONE LOADS 3.0V BAT JIG 1 2 3 4 + MAX14525 *EP 8 7 6 5 IN IN TA GND TA SLEW RATE CONTROL 2V JIG P S_EN ON_K S_EN GND TDFN-EP 2mm x 2mm *CONNECT EXPOSED PAD TO GND. ________________________________________________________________ Maxim Integrated Products 1 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. Battery Switch with Four Enable Inputs MAX14525 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 DC CHARACTERISTICS Input Voltage Range On-Resistance Disable Supply Current VBAT Supply Current Increase in Supply Current with VJIG/VS_EN Voltage Increase in Supply Current with VON_K Voltage Peak Current UVLO Undervoltage Lockout LOGIC INPUT TA Threshold Voltage TA Threshold Hysteresis TA Input Resistance JIG, S_EN Input Logic-High JIG, S_EN Input Logic-Low JIG, S_EN Input Leakage Current IN AND Gate Threshold Voltage ON_K Threshold Voltage ON_K Threshold Hysteresis VIH VIL IIN VIN_TH VON_K_TH Low-to-high transition (Figure 1) VBAT = +5.5V -200 0.3 x VBAT 2.94 3.0 1% VTA = 1V 50 1.4 0.4 +200 0.6 x VBAT 3.06 VTA_TH 1.15 1.7 1% 100 180 kΩ V V nA V V 2.5 V VBAT, VIN RON IBAT_DIS IBAT ΔIBAT ΔIBAT ILIM ILOAD = 100mA, VBAT = +3.0V VBAT = +5.5V (VJIG = VS_EN = VON_K = VTA = VIN = 0) VJIG = VS_EN = VBAT , VON_K = VTA = 0 VJIG = VS_EN = VIH or VIL VBAT = VON_K = +3.6V VBAT = +3.6V Ramping VBAT 5 1.9 0.8 2.2 35 5.5 90 1 4.5 2 4.5 V mΩ µA µA µA µA A V SYMBOL CONDITIONS MIN TYP MAX UNITS 2 _______________________________________________________________________________________ Battery Switch with Four Enable Inputs ELECTRICAL CHARACTERISTICS (continued) (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 ON_K Input Leakage Current Turn-On Delay Time Turn-On Rise Time Turn-Off Delay Time Turn-Off Fall Time SYMBOL ION_K tONDLY tONRISE tOFFDLY tOFFFALL CONDITIONS VBAT = VON_K = +3.6V From any enable high to VIN = 10% of VBAT VIN 10% to 90% of VBAT From any enable low to VIN = 90% of VBAT VIN 90% to 10% of VBAT 500 600 1800 130 60 MIN TYP MAX 3 2600 5000 300 150 UNITS µA µs µs µs µs MAX14525 SWITCH DYNAMICS (RL = 20Ω, CL = 0.1µF) (Figure 2) 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 MAX14525 toc01 NORMALIZED RON vs. TEMPERATURE 1.8 1.6 NORMALIZED RON 1.4 1.2 1.0 0.8 0.6 0.4 IL = 100mA VBAT = +3.0V -40 -15 10 35 60 85 MAX14525 toc02 TA THRESHOLD vs. VIN MAX14525 toc03 1.5 1.4 1.3 NORMALIZED RON 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 2.2 3.3 VIN (V) 4.4 IL = 100mA 2.0 2.50 2.25 TA THRESHOLD (V) TA = +25°C 2.00 1.75 1.50 1.25 1.00 2.2 3.3 VIN (V) 4.4 TA = +85°C TA = -40°C 0.2 0 5.5 5.5 TEMPERATURE (°C) ON_K THRESHOLD vs. VIN MAX14525 toc04 S_EN THRESHOLD vs. VIN MAX14525 toc05 3.010 TA = +25°C ON_K THRESHOLD (V) 3.005 1.25 TA = -40°C 1.15 S_EN THRESHOLD (V) 1.05 3.000 TA = +85°C 0.95 TA = +25°C 0.85 TA = +85°C 2.995 TA = -40°C 2.990 2.2 3.3 VIN (V) 4.4 5.5 0.75 2.2 3.3 VIN (V) 4.4 5.5 _______________________________________________________________________________________ 3 Battery Switch with Four Enable Inputs MAX14525 Typical Operating Characteristics (continued) (VIN = +3.6V, TA = +25°C, unless otherwise noted.) BAT CURRENT vs. VOLTAGE MAX14525 toc06 TURN-ON TIME vs. VIN MAX14525 toc07 TURN-ON DELAY vs. VIN MAX14525 toc08 3.5 TA = -40°C 2.8 TA = +25°C IBAT (μA) 2.1 1200 4.0 1000 TURN-ON TIME (μs) 3.2 TURN-ON DELAY (ms) TA = +85°C 2.4 800 TA = +25°C 600 TA = +85°C 1.4 TA = +85°C 0.7 1.6 TA = -40°C 400 RL = 20Ω CL = 0.1μF 2.2 3.3 0.8 TA = -40°C 0 4.4 VIN (V) 5.5 2.2 TA = +25°C RL = 20Ω CL = 0.1μF 5.5 0 2.2 3.3 VBAT (V) 4.4 5.5 200 3.3 VIN (V) 4.4 TURN-OFF TIME vs. VIN MAX14525 toc09 TURN-OFF DELAY vs. VIN MAX14525 toc10 180 TA = +85°C 160 TURN-OFF TIME (μs) 80 72 TURN-OFF DELAY (μs) TA = +85°C 140 TA = +25°C 64 TA = +25°C TA = -40°C 48 RL = 20Ω CL = 0.1μF 2.2 3.3 VIN (V) 4.4 5.5 120 56 100 TA = -40°C RL = 20Ω CL = 0.1μF 4.4 VIN (V) 5.5 80 2.2 3.3 40 TURN-ON RESPONSE MAX14525 toc11 TURN-OFF RESPONSE MAX14525 toc12 VJIG 1V/div VIN 1V/div VJIG 1V/div VBAT = +3.6V CL = 0.1μF RL = 20Ω 400μs/div VBAT = +3.6V CL = 0.1μF RL = 20Ω 400μs/div VIN 1V/div 4 _______________________________________________________________________________________ Battery Switch with Four Enable Inputs MAX14525 OFF ON_K INPUT A HYSTERESIS B RELEASED THRESHOLD DETECTOR THRESHOLD ON OFF 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 tOFFFALL TIME 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 1 2 3 4 5 6 7, 8 — NAME BAT JIG ON_K S_EN GND TA IN EP Lithium-Ion (Li+) Battery Connection Enable Input with Standard Logic Threshold Enable Input with Accurate Threshold (+3.0V) Enable Input with Standard Logic Threshold Logically ANDed with IN Ground Enable Input with High Threshold 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. Exposed Pad. Connect EP to ground. Do not use EP as the only ground connection. FUNCTION 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). 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. 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 Chip Information PROCESS: CMOS 6 _______________________________________________________________________________________ Battery Switch with Four Enable Inputs Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 8 TDFN-EP PACKAGE CODE T822+2 DOCUMENT NO. 21-0168 MAX14525 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.