MIC2507 Micrel MIC2507 Quad Integrated High-Side Switch Not Recommended for New Designs General Description Features The MIC2507 is a quad integrated high-side power switch that consists of four protected N-channel MOSFET output pass transistors each with a dedicated TTL compatible input and charge pump. The MIC2507 can be used instead of separate high-side drivers and MOSFETs in many lowvoltage applications. The MIC2507 switches 2.7V to 7.5V and can deliver at least 1A continuous current from any individual output. A slow turn-on feature prevents high inrush current when switching capacitive loads. The internal control circuitry is powered from switch #1’s supply input. The MIC2507 allows any output to be pulled higher than its input voltage while in the off state. • • • • • • • A multipurpose open-drain fault flag output indicates overcurrent limiting, open-load detection, and thermal shutdown. Overcurrent limiting is internally fixed and requires no external components. Open-load detection is active only when the switch is off. Open-load detection requires one high-value resistor from the load to the supply. • Battery Management • Power Management 2.7V to 7.5V supply Current limit Open-load detection Thermal shutdown Open-drain fault flag <1µA off-state current Slow turn-on and fast turnoff 1ms typical rise time (load dependent) • Low MOSFET on-resistance 120mΩ typical at 5V 130mΩ typical at 3.3V Applications Ordering Information Part Number Temperature Range Package MIC2507BM –40°C to +85°C 14-lead SOIC Thermal shutdown turns off the output if the die temperature exceeds approximately 135°C. The switch automatically restarts when the temperature falls 10°C. The MIC2507 is available in SOIC packages with a temperature range of –40°C to +85°C. Typical Application +2.7V to +7.5V MIC2507BN 1 Load 2 ON Control OFF Input #1 3 Control ON Input #2 OFF 5 4 Load 6 7 IN1 IN4 OUT1 OUT4 CTL1 CTL4 GND FLG CTL2 CTL3 OUT2 OUT3 IN2 IN3 14 13 Load 12 ON OFF Control Input #4 11 10 9 “Fault” LED ON Control OFF Input #3 Load 8 Distributed-Load Power Switch Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com August 1999 1 MIC2507 MIC2507 Micrel Pin Configuration MIC2507 IN1 1 14 IN4 OUT1 2 13 OUT4 CTL1 3 12 CTL4 GND 4 11 FLG CTL2 5 10 CTL3 OUT2 6 9 OUT3 IN2 7 8 IN3 14-Pin SOIC (M) Pin Description Pin Number Pin Name 1 IN1 2 OUT1 Switch #1 Output: Output MOSFET source. Typically connect to switched side of load. Output can be pulled above input voltage in off mode. 3 CTL1 Control #1 (Input): Noninverting TTL compatible control input. 4 GND Ground: Power return. 5 CTL2 Control #2 (Input): Same function as CTL1. 6 OUT2 Supply #2 Output: Output MOSFET source. 7 IN2 Switch #2 Input: Output MOSFET drain. Also is supply voltage for respective channel control input and charge pump. 8 IN3 Switch #3 Input: Same function as IN2. 9 OUT3 Supply #3 Output: Output MOSFET source. 10 CTL3 Control #3 (Input): Same function as CTL1. 11 FLAG Fault Flag (Output): Active-low, open-drain output. If all CTLs are low, indicates open load. If any CTL is high, indicates current limit or thermal shutdown. 12 CTL4 Control #4 (Input): Same function as CTL1. 13 OUT4 Supply #4 Input: Output MOSFET source. 14 IN4 Switch #4 Output: Same function as IN2. MIC2507 Pin Function Supply #1 Input: Output MOSFET drain. Also is the supply input for the common oscillator, thermal shutdown, and flag circuitry. Must be powered to use switch #2, #3, or #4. Connect to supply for switch #1. 2 August 1999 MIC2507 Micrel Absolute Maximum Ratings Operating Ratings Supply Voltage (VIN max) ................................................ 8V Output Current (IOUT max) ......................... Internally Limited Control Input (VCTLn min/max) .......................... –0.3V to 15V Fault Flag Voltage (VFLG max) ....................................... 40V Fault Flag Current (IFLG max) ...................................... 25mA Storage Temperature ............................... –65°C to +150°C Lead Temperature ..................................................... 260°C Junction Temperature (TJ) ....................... Internally Limited Supply Voltage (VIN) ................................... +2.7V to +7.5V Ambient Operating Temperature (TA) ........ –40°C to +85°C Thermal Resistance (θJA)...................................... 120°C/W Electrical Characteristics VIN = +5V; TA = 25°C, bold values indicated –40°C ≤ TA ≤ +85°C; unless noted. Parameter Condition Supply Current Control Input Threshold Voltages Min Typ Max Units CTL1–4 = logic 0; OUT = open 0.1 10 µA CTL1 = logic 1; CTL2–4 = logic 0; OUT = open 80 160 µA CTL1–4 = logic 1; OUT = open 100 180 µA VCTLn rising 1.9 2.4 V VCTLn falling Control Input Current 0.8 V CTLn = logic 0 0.010 1 µA CTLn = logic 1 0.010 1 µA Control Input Capacitance Output MOSFET Resistance 1.6 1 pF VIN = 5V 120 180 240 mΩ mΩ VIN = 3.3V 130 200 260 mΩ mΩ 0.05 10 µA Output Leakage Output Turn-On Delay Time RL = 10Ω each output 0.5 1.5 ms Output Turn-On Rise Time RL = 10Ω each output 1.6 5.0 ms Output Turn-off Delay + Fall Time RL = 10Ω each output 1.0 10 µs Current Limit Threshold 1 2 A Open Load Threshold CTLn = logic low, Note 1 1.1 Overtemperature Threshold TJ increasing 135 °C TJ decreasing 125 °C VIN = 5V 160 300 Ω VIN = 3.3V 240 500 Ω IL = 1mA 160 300 mV Error Flag Output Resistance Error Flag Saturation Voltage 1.6 V General Note: Devices are ESD protected; however, handling precautions are recommended. Note 1: Open load threshold is the OUT voltage where FLG becomes active (low). OUT driven externally. August 1999 3 MIC2507 MIC2507 Micrel Typical Characteristics On-Resistance vs. Supply Voltage Turn-On Characteristics R = 10Ω L 0 6 -2 2 150 125 R = 10Ω L 0 100 0 0.5 1.0 1.5 2.0 2.5 3.0 TIME (ms) SUPPLY CURRENT (µA) CONTROL (V) RL = 10Ω 2 0 OUTPUT (V) -2 6 4 2 0 0 2 TIME (µs) 4 ALL OUTPUTS ON 80 SUPPLY CURRENT (µA) CONTROL THRESHOLD (V) 2 4 6 SUPPLY VOLTAGE (V) 1.5 CTL FALLING 1.0 0.5 2 4 6 SUPPLY VOLTAGE (V) 120 160 120 80 40 0 8 ALL OUTPUTS ON 80 1 OUTPUT ON 40 Control Input Threshold vs. Temperature CTL FALLING 1.0 0.5 400 300 ALL OUTPUTS OFF 200 100 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) Flag On-Resistance vs. Temperature 400 VIN = 5.0V 1.5 1.0 8 500 Delay and Rise Times vs. Temperature TIME (ms) 1.5 2 4 6 SUPPLY VOLTAGE (V) 600 2.0 CTL RISING 0 Off-State Supply Current vs. Temperature 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 8 2.5 CONTROL THRESHOLD (V) 0 200 ALL OUTPUTS OFF 160 CTL RISING RISE 0.5 300 V IN = 3.3V 200 100 VIN = 5.0V DELAY 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) MIC2507 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) On-State Supply Current vs. Temperature 2.0 2.0 1 OUTPUT ON 40 6 2.5 0 RL = 10Ω 240 120 Control Input Threshold vs. Supply Voltage 0 40 Off-State Supply Current vs. Supply Voltage 160 0 -2 VIN = 5.0V 80 8 200 6 -2 -4 2 4 6 SUPPLY VOLTAGE (V) VIN = 3.3V 120 On-State Supply Current vs. Supply Voltage Turn-Off Characteristics 4 0 SUPPLY CURRENT (nA) -2 -0.5 160 SUPPLY CURRENT (nA) OUTPUT 4 200 ON-RESISTANCE (mΩ) ON-RESISTANCE (mΩ) 4 ON-RESISTANCE (Ω) CONTROL 6 2 On-Resistance vs. Temperature 175 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 4 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) August 1999 MIC2507 Micrel Typical Characteristics Open-Load Threshold Voltage vs. Supply Voltage Open-Load Threshold Voltage vs. Temperature 1.0 0.8 0.6 0.4 0.2 0 August 1999 2 4 6 SUPPLY VOLTAGE (V) 8 2.5 CURRENT LIMIT (A) 1.2 0 Current Limit vs. Temperature 1.5 OPEN-LOAD THRESHOLD (V) OPEN-LOAD THRESHOLD (V) 1.4 1.0 0.5 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) 5 VIN = 3.3V 2.0 V = 5.0V IN 1.5 1.0 -60 -30 0 30 60 90 120 150 TEMPERATURE (°C) MIC2507 MIC2507 Micrel Block Diagram VIN1/2 IN1 0.01Ω metal THERMAL SHUTDOWN CURRENT LIMIT OSC. CHARGE PUMP GATE CONTROL OUT1 OPEN LOAD DETECT Load 1 CTL1 CURRENT LIMIT IN2 CHARGE PUMP GATE CONTROL OUT2 OPEN LOAD DETECT Load 2 CTL2 CURRENT LIMIT IN3 CHARGE PUMP GATE CONTROL CTL3 OUT3 OPEN LOAD DETECT VIN4 CURRENT LIMIT IN4 CHARGE PUMP Optional Resistor for Open-Load Detect GATE CONTROL CTL4 OUT4 Load 4 OPEN LOAD DETECT FLAG MIC2507 MIC2507 6 August 1999 MIC2507 Micrel Thermal Shutdown Thermal shutdown shuts off all output MOSFETs and signals the fault flag if the die temperature exceeds approximately 135°C. 10°C of hysteresis prevents the switch from turning on until the die temperature drops to approximately 125°C. Functional Description The MIC2507 is a noninverting device. A TTL high applied to a CTL (control) input turns on the respective output transistor. A TTL low turns off the output transistor. Overcurrent and overtemperature fault conditions inhibit MOSFET turn on. Supply Inputs Thermal shutdown is indicated by the fault flag only when CTL is high (MOSFET on). Overcurrent Limit The overcurrent limit level is preset internally. The preset level prevents damage to the output MOSFET but allows a minimum current of 1A through the output MOSFET. Output current is monitored across an internal shunt resistor. IN1 (supply input #1) is the supply side of switch #1 but also powers the common oscillator, thermal shutdown, and flag. Power must be applied to IN1 to use switch #2, #3, or #4. IN1 powers the charge pump for switch #1. IN2, IN3, and IN4 are the supplies for switches #2, #3, and #4, respectively. Each supply input powers its respective charge pump and control input circuitry. Control Input Overcurrent detection functions only when CTL is logic high (output is on). Open-Load Detection Applying a TTL high signal to any CTL input activates the oscillator and the CTL input’s respective charge pump and gate control circuit. If there are no fault conditions, the output MOSFET turns ON. Oscillator/Charge Pump Open-load detection indicates the absence of an output load by signaling the fault flag. Open-load detection is optional and is enabled by connecting a high-value pull-up resistor between IN and OUT. If there is no load, the circuit detects a high OUT voltage and signals the fault flag. Under normal conditions, the low resistance of a typical load pulls OUT low. Open-load detection functions only when CTL is low (output is off). Fault Flag The oscillator produces a 100kHz square wave output which drives each charge pump. The oscillator is disabled when all CTL inputs are low or die temperature is greater than 135°C. Each charge pump is a voltage quintupler (5×). Its output voltage is clamped to prevent the output switch gate oxide damage. The charge pump capacitors are self contained. Gate Control FLG (fault flag) is an N-channel open-drain MOSFET output. The fault-flag MOSFET is active (low) for one or more of the following conditions on any one or more outputs: open load, current limit, or thermal shutdown. Each gate control circuit charges the output MOSFET’s gate from its charge pump or discharges the MOSFET gate to ground as determined by the control input and thermal shutdown. August 1999 7 MIC2507 MIC2507 Micrel Package Information PIN 1 DIMENSIONS: INCHES (MM) 0.154 (3.90) 0.026 (0.65) MAX) 0.193 (4.90) 0.050 (1.27) 0.016 (0.40) TYP TYP 45° 0.006 (0.15) 0.057 (1.45) 0.049 (1.25) 0.344 (8.75) 0.337 (8.55) SEATING PLANE 3°–6° 0.244 (6.20) 0.228 (5.80) 14-Lead SOIC (M) MIC2507 8 August 1999