CS70P

CS70 High side current sense high voltage op amp Datasheet - production data  Pin selectable gain: 20 V/V, 25 V/V, 50 V/V or 100 V/V  Buffered output Applications  Wireless battery chargers TSSOP8 (Plastic package)  Chargers for portable equipment  Precision current sources 8 Vp Vm 1 SEL1 2 7 Vcc- SEL2 3 6 Gnd 5 Vcc+ Out 4 Pin connections (top view)  Wearable Description The CS70 measures a small differential voltage on a high-side shunt resistor and translates it into a ground-referenced output voltage. The gain is adjustable to four different values from 20 V/V up to 100 V/V by two selection pins. Wide input common-mode voltage range, low quiescent current, and tiny TSSOP8 packaging enable use in a wide variety of applications. Features  Independent supply and input common-mode voltages  Wide common-mode operating range: 2.9 V to 70 V in single-supply configuration, -2.1 V to 65 V in dual-supply configuration  Wide common-mode surviving range: -16 V to 75 V (reversed battery and load-dump conditions)  Supply voltage range: 2.7 to 5.5 V in singlesupply configuration The input common-mode and power-supply voltages are independent. The common-mode voltage can range from 2.9 V to 70 V in the singlesupply configuration or be offset by an adjustable voltage supplied on the Vcc- pin in the dualsupply configuration. With a current consumption lower than 360 µA and a virtually null input leakage current in standby mode, the power consumption in the applications is minimized.  Low current consumption: ICC max = 360 µA Table 1. Device summary Part number Temperature range Package Packaging Marking CS70P - 40° C to +125 °C TSSOP8 Tape and reel 103I March 2014 This is information on a product in full production. DocID026041 Rev 1 1/24 www.st.com Contents CS70 Contents 1 Application schematic and pin description . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 6 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Electrical characteristics curves: current sense amplifier . . . . . . . . . 10 5 Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.1 Common-mode rejection ratio (CMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.2 Supply voltage rejection ratio (SVR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.3 Gain (Av) and input offset voltage (Vos) . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.4 Output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.5 Input offset drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.6 Output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 Maximum permissible voltages on pins . . . . . . . . . . . . . . . . . . . . . . . . 18 7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8.1 9 2/24 TSSOP8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 DocID026041 Rev 1 CS70 Application schematic and pin description The CS70 high-side current sense amplifier can be used in either single- or dual-supply mode. In the single-supply configuration, the CS70 features a wide 2.9 V to 70 V input common-mode range totally independent of the supply voltage. In the dual-supply range, the common-mode range is shifted by the value of the negative voltage applied on the Vccpin. For instance, with Vcc+ = 5 V and Vcc- = -5 V, then the input common-mode range is 2.1 V to 65 V. Figure 1. Single-supply configuration schematic Vsense Iload Common-mode voltage: 2.9 V to 70 V Rsense load 1 Application schematic and pin description Vp 5V Vcc+ Vm Vcc Rg2 Rg1 SEL1 Sense amplifier GPIO1 Voltage buffer SEL2 Vout K2 Rg3 CS70 Vcc- Gnd GPIO2 ADC Out Gnd μ Controller AM04517v1 DocID026041 Rev 1 3/24 24 Application schematic and pin description CS70 Figure 2. Dual-supply configuration schematic Vsense Iload Vp Common-mode voltage: -2.1 V to 65 V load Rsense 5V Vm Vcc Vcc+ Out Vout ADC SEL1 CS70 GPIO1 SEL2 Vcc- μ Controller GPIO2 Gnd Gnd -5 V AM04518v1 Figure 3. Common-mode versus supply voltage in dual-supply configuration Vicm common-mode voltage operating range Max = 70 V Max = 65 V Max = 60 V min = 2.9 V min = -2.1 V Vcc- = 0 V Single-supply Vcc- = -5 V min = -7.1 V Vcc- = -10 V Dual-supply AM04519 4/24 DocID026041 Rev 1 CS70 Application schematic and pin description Table 2 describes the function of each pin. Their position is shown in the illustration on the cover page and in Figure 1 on page 3. Table 2. Pin description Symbol Type Out Analog output Gnd Vcc+ Function The Out voltage is proportional to the magnitude of the sense voltage Vp-Vm. Ground line Power supply Vcc- Positive power supply line. Negative power supply line. Vp Analog input Connection for the external sense resistor. The measured current enters the shunt on the Vp side. Connection for the external sense resistor. The measured current exits the shunt on the Vm side. Vm SEL1 Digital input Gain-select pin SEL2 DocID026041 Rev 1 5/24 24 Absolute maximum ratings and operating conditions 2 CS70 Absolute maximum ratings and operating conditions Table 3. Absolute maximum ratings Symbol Vid Vin_sense Vin_sel Vcc+ Vcc+-Vcc- Parameter Input pins differential voltage (Vp-Vm) Sensing pins input voltages (Vp, Vm) -0.3 to Vcc++0.3 Positive supply voltage(2) V -0.3 to 7 DC supply voltage 0 to 15 voltage(2) Tstg Storage temperature ESD -16 to 75 Gain selection pins input voltages (SEL1, SEL2) DC output pin Rthja Unit ±20 (1) (2) Vout Tj Value -0.3 to Vcc++0.3 -55 to 150 °C Maximum junction temperature 150 TSSOP8 thermal resistance junction to ambient 120 SO8 thermal resistance junction to ambient 125 HBM: human body model(3) 2.5 kV MM: machine model(4) 150 V 1.5 kV CDM: charged device model(5)  1. These voltage values are measured with respect to the Vcc- pin. 2. These voltage values are measured with respect to the Gnd pin. 3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kresistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ). This is done for all couples of connected pin combinations while the other pins are floating. 5. Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to ground. Table 4. Operating conditions Symbol Parameter Value Unit Vcc+ Supply voltage in single-supply configuration from Tmin to Tmax (Vcc- connected to Gnd = 0 V) 2.7 to 5.5 V Negative supply voltage in dual-supply configuration from Tmin to Tmax Vcc- 6/24 - Vcc+ = 5.5 V max -8 to 0 Vcc+ = 3 V max -11 to 0 V Vicm Common-mode voltage range referred to pin Vcc 2.9 to 70 (Tmin to Tmax) V Toper Operational temperature range (Tmin to Tmax) °C DocID026041 Rev 1 -40 to 125 CS70 3 Electrical characteristics Electrical characteristics The electrical characteristics given in the following tables are measured under the following test conditions unless otherwise specified.  Tamb = 25 °C, Vcc+ = 5 V, Vcc- connected to Gnd (single-supply configuration).  Vsense = Vp-Vm = 50 mV, Vm = 12 V, no load on Out, all gain configurations. Table 5. Supply Symbol ICC ICC1 Parameter Total supply current Total supply current Test conditions Min. Typ. Max. 200 360 300 480 Min. Typ. Max. 90 105 Vsense = 0 V, Tmin < Tamb < Tmax Vsense = 50 mV Av = 50 V/V Tmin < Tamb < Tmax - Unit µA Table 6. Input Symbol Parameter Test conditions DC common-mode rejection DC CMR Variation of Vout versus Vicm referred to input(1) 2.9 V< Vm < 70 V Tmin < Tamb < Tmax AC common-mode rejection Variation of Vout versus Vicm AC CMR referred to input (peak-to-peak voltage variation) Av = 50 V/V or 100 V/V 2.9 V< Vm < 30 V 1 kHz sine wave SVR Supply voltage rejection Variation of Vout versus VCC(2) SEL1 = Gnd, SEL2 = Gnd 2.7 V< VCC < 5.5 V Vsense = 30 mV Tmin < Tamb < Tmax Vos Input offset voltage(3) Tamb = 25 C Tmin < Tamb < Tmax dVos/dT Input offset drift vs. T Av = 50 V/V Tmin < Tamb < Tmax Ilk Input leakage current VCC = 0 V Tmin < Tamb < Tmax Iib Input bias current Vsense = 0 V Tmin < Tamb < Tmax VIL Logic low voltage threshold (SEL1 and SEL2) VCCmin < VCC < VCCmax VIH Logic high voltage threshold (SEL1 and SEL2) VCCmin < VCC < VCCmax Isel Gain-select pins (SEL1 and SEL2) SEL pin connected to GND or VCC Tmin < Tamb < Tmax input bias current Tmin < Tamb < Tmax Tmin < Tamb < Tmax 95 85 Unit dB 95 -20 ±500 ±1100 µV +5 µV/°C 1 µA 10 -0.3 15 0.5 V 1.2 VCC 400 nA 1. See Section 5: Parameter definitions for the definition of CMR. 2. See Section 5 for the definition of SVR. 3. See Section 5 for the definition of Vos. DocID026041 Rev 1 7/24 24 Electrical characteristics CS70 Table 7. Output Symbol Av Vout/T Parameter Test conditions Gain SEL1 = Gnd, SEL2 = Gnd SEL1 = Gnd, SEL2 = Vcc+ SEL1 = Vcc+, SEL2 = Gnd SEL1 = Vcc+, SEL2 = Vcc+ Output voltage drift vs. T(1) Av = 50 V/V Tmin < Tamb < Tmax Vout/Iout Output stage load regulation Min. Typ. Max. 20 25 50 100 -10 mA < Iout