TS1100/01/02/03 Data Sheet TS1100/01/02/03 Uni- and Bidirectional Current-Sense Amplifiers The TS1100/01/02/03 Unidirectional and Bidirectional Current Sense Amplifiers consume a very low 0.68 µA supply current. The TS1100 and TS1101 high-side current sense amplifiers (CSA) combine a 100 µV (max) input offset voltage (VOS) and a 0.6% (max) gain error (GE), with both specifications optimized for any precision current measurement. The TS1102 and TS1103 CSAs combine a 200 µV (max) VOS and a 0.6% (max) GE for cost-sensitive applications. For all high-side current sensing applications, the TS1100/01/02/03 CSAs are self-powered and feature a wide input common-mode voltage range from 2 to 27 V. For the bidirectional CSAs, TS1101 and TS1103, a SIGN comparator digital output is provided that indicates the direction of current flow. All CSAs are specified for operation over the –40 °C to +105 °C temperature range. Applications • Power Management Systems • Portable/Battery-Powered Systems • Smart Chargers • Battery Monitoring • Overcurrent and Undercurrent Detection • Remote Sensing • Industrial Control silabs.com | Smart. Connected. Energy-friendly. KEY FEATURES • Low Supply Current • Current Sense Amplifier: 0.68 µA • IVDD: 0.02 µA • High Side Bidirectional and Unidirectional Current Sense Amplifier • Wide CSA Input Common Mode Range: +2 V to +27 V • Low CSA Input Offset Voltage: 100 µV (max) (TS1100 and TS1101 Only) • Low Gain Error: 0.6% (max) • Four Gain Options Available: • 25 V/V • 50 V/V • 100 V/V • 200 V/V • 5-Lead and 6-Lead SOT23 Packaging Rev. 1.0 TS1100/01/02/03 Data Sheet Ordering Information 1. Ordering Information Ordering Number1 Part Marking TS1100-25EG5 TADJ TS1100-50EG5 TADK TS1100-100EG5 TADL TS1100-200EG5 TADM 200 TS1101-25EG6 TADN 25 TS1101-50EG6 TADP TS1101-100EG6 TADQ TS1101-200EG6 TADR 200 TS1102-25EG5 TADS 25 TS1102-50EG5 TADT TS1102-100EG5 TADU TS1102-200EG5 TADV 200 TS1101-25EG6 TADW 25 TS1101-50EG6 TADX TS1101-100EG6 TADY TS1101-200EG6 TADZ Description Gain V/V 25 Unidirectional current sense amplifier (VOS(MAX) = 200 µV) Bidirectional current sense amplifier (VOS(MAX) = 200 µV) Unidirectional current sense amplifier (VOS(MAX) = 300 µV) Bidirectional current sense amplifier (VOS(MAX) = 300 µV) 50 100 50 100 50 100 50 100 200 Note: 1. Adding the suffix, "T", to the part number (e.g., TS1101-25EG6T) denotes tape and reel. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 1 TS1100/01/02/03 Data Sheet System Overview 2. System Overview 2.1 Typical Application Circuits Figure 2.1. TS1100 and TS1102 Typical Application Circuit Figure 2.2. TS1101 and TS1103 Typical Application Circuit silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 2 TS1100/01/02/03 Data Sheet System Overview 2.2 Theory of Operation The internal configuration of the TS1100/02 (a unidirectional high-side, current-sense amplifier) is based on a common operational amplifier circuit used for measuring load currents (in one direction) in the presence of high common-mode voltages. In the general case, a current-sense amplifier monitors the voltage caused by a load current through an external sense resistor and generates an output voltage as a function of that load current. The internal configuration of the TS1101/03 (a bidirectional high-side, current-sense amplifier) is a variation of the TS1100/02 unidirectional current-sense amplifier. In the design of the TS1101/03, the input amplifier was reconfigured for fully differential input/output operation and a second low-threshold p-channel FET (M2) was added where the drain terminal of M2 is also connected to ROUT. Therefore, the behavior of the TS1101/03 for when VRS– > VRS+ is identical for when VRS+ > VRS–. Referring to the typical application circuit, the inputs of the op-amp based circuit are connected across an external RSENSE resistor that is used to measure load current. At the non-inverting input of the current-sense amplifier (the RS+ terminal), the applied voltage is ILOAD × RSENSE. Since the RS– terminal is the non-inverting input of the internal op-amp, op-amp feedback action forces the inverting input of the internal op-amp to the same potential. Therefore, the voltage drop across RSENSE (VSENSE) and the voltage drop across RGAINA (at the RS+ terminal) are equal. Necessary for gain ratio matched, both RGAINA and RGAINB are the same value. Since p-channel M1’s source is connected to the inverting input of the internal op amp and since the voltage drop across RGAINA is the same as the external VSENSE, op amp feedback action drives the gate of M1 such that M1’s drain-source current is equal to: V SENSE I DS (M 1) = RGAINA or I DS (M 1) = I LOAD × RSENSE RGAINA Since M1’s drain terminal is connected to ROUT, the output voltage of the current-sense amplifier at the OUT terminal is, therefore: ROUT V OUT = I LOAD × RSENSE × RGAINA For the TS1101 and TS1103, when the voltage at the RS– terminal is greater than the voltage at the RS+ terminal, the external VSENSE voltage drop is impressed upon RGAINB. The voltage drop across RGAINB is then converted into a current by M2 that then produces an output voltage across ROUT. In this design, when M1 is conducting current (VRS+ > VRS–), the TS1101/03’s internal amplifier holds M2 OFF. When M2 is conducting current (VRS– > V RS+), the internal amplifier holds M1 OFF. In either case, the disabled FET does not contribute to the resultant output voltage. The current-sense amplifier’s gain accuracy is therefore the ratio match of ROUT to RGAIN[A/B]. For each of the four gain options available, Table 1 lists the values for ROUT and RGAIN[A/B]. The TS1101’s output stage is protected against input overdrive by use of an output current-limiting circuit of 3 mA (typical) and a 7 V internal clamp protection circuit. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 3 TS1100/01/02/03 Data Sheet System Overview 2.3 SIGN Comparator Output As shown in the TS1101/03’s block diagram, the design of the TS1101/03 incorporated one additional feature: an analog comparator whose inputs monitor the internal amplifier’s differential output voltage. While the voltage at the TS1101/03’s OUT terminal indicates the magnitude of the load current, the TS1101/03’s SIGN output indicates the load current’s direction. The SIGN output is a logic high when M1 is conducting current (VRS+ > VRS–). Alternatively, the SIGN output is a logic low when M2 is conducting current (VRS+ < VRS–). The SIGN comparator’s transfer characteristic is illustrated in the figure below. Unlike other current-sense amplifiers that implement a OUT/ SIGN arrangement, the TS1101/03 exhibits no “dead zone” at ILOAD switchover. The other attribute of the SIGN comparator’s behavior is its propagation delay as a function of applied VSENSE [(VRS+ – VRS–) or (VRS– – VRS+)]. As shown below, the SIGN comparator’s propagation delay behavior is symmetric regardless of current-flow direction and is inversely proportional to VSENSE. Figure 2.3. SIGN Comparator Transfer Characteristic and Propagation Delay Figure 2.4. SIGN Comparator Propagation Delay vs. VSENSE silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 4 TS1100/01/02/03 Data Sheet System Overview 2.4 Choosing the Sense Resistor Selecting the optimal value for the external RSENSE is based on the following criteria and for each commentary follows: 1. RSENSE Voltage Loss 2. VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE 3. Total ILOAD Accuracy 4. Circuit Efficiency and Power Dissipation 5. RSENSE Kelvin Connections 2.4.1 RSENSE Voltage Loss For the lowest IR power dissipation in RSENSE, the smallest usable resistor value for RSENSE should be selected. 2.4.2 VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE As there is no separate power supply pin for the current-sense amplifiers, the circuit draws its power from the voltage at its RS+ and RS- terminals. Therefore, the signal voltage at the OUT terminal is bounded by the minimum voltage applied at the RS+ terminal. Therefore: V OUT (max ) = V RS +(min ) − V SENSE (max ) − V OH (max ) and RSENSE < V OUT (max ) GAIN × I LOAD(max ) where the full-scale VSENSE should be less than VOUT(MAX)/GAIN at the application’s minimum RS+ terminal voltage. For best performance with a 3.6 V power supply, RSENSE should be chosen to generate a VSENSE of: a) 120 mV (for the 25 V/V GAIN option), b) 60 mV (for the 50 V/V GAIN option), c) 30 mV (for the 100 V/V GAIN option), or d) 15 mV (for the 200 V/V GAIN option) at the full-scale ILOAD current in each application. For the case where the minimum power supply voltage is higher than 3.6 V, each of the four full-scale VSENSEs above can be increased. 2.4.3 Total Load Current Accuracy In the current-sense amplifiers’ linear region where VOUT < VOUT(max), there are two specifications related to the circuit’s accuracy: a) the input offset voltage and b) gain error (GE(max) = 0.6%). An expression for the current sense amplifiers’ total error is given by: V OUT = GAIN × (1 ± GE ) × V SENSE ± (GAIN × V OS ) A large value for RSENSE permits the use of smaller load currents to be measured more accurately because the effects of offset voltages are less significant when compared to larger VSENSE voltages. Due care though should be exercised as previously mentioned with large values of RSENSE. 2.4.4 Circuit Efficiency and Power Dissipation IR losses in RSENSE can be large especially at high load currents. It is important to select the smallest, usable RSENSE value to minimize power dissipation and to keep the physical size of RSENSE small. If the external RSENSE is allowed to dissipate significant power, then its inherent temperature coefficient may alter its design center value, thereby reducing load current measurement accuracy. Precisely because the current-sense amplifiers input stages were designed to exhibit a very low input offset voltage, small RSENSE values can be used to reduce power dissipation and minimize local hot spots on the PCB. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 5 TS1100/01/02/03 Data Sheet System Overview 2.4.5 RSENSE Kelvin Connections For optimal VSENSE accuracy in the presence of large load currents, parasitic PCB track resistance should be minimized. Kelvin-sense PCB connections between RSENSE and the current-sense amplifier’s RS+ and RS– terminals are strongly recommended. The drawing below illustrates the connections between the current-sense amplifier and the current-sense resistor. The PCB layout should be balanced and symmetrical to minimize wiring-induced errors. In addition, the pcb layout for RSENSE should include good thermal management techniques for optimal RSENSE power dissipation. Figure 2.5. Making PCB Connections to RSENSE 2.4.6 RSENSE Composition Current-shunt resistors are available in metal film, metal strip, and wire-wound constructions. Wire-wound current-shunt resistors consist of a wire spirally wound onto a core. As a result, these types of current shunt resistors exhibit the largest self inductance. In applications where the load current contains high-frequency transients, metal film or metal strip current-sense resistors are recommended. 2.4.7 Internal Noise Filter In power management and motor control applications, current-sense amplifiers are required to measure load currents accurately in the presence of both externally-generated differential and common-mode noise. An example of differential-mode noise that can appear at the inputs of a current-sense amplifier is high-frequency ripple. High-frequency ripple (whether introduced into the circuit inductively or capacitively) can produce a differential-mode voltage drop across the external current-shunt resistor (RSENSE). An example of externally-generated, common-mode noise is the high-frequency output ripple of a switching regulator that can result in the injection of common-mode noise into both inputs of a current-sense amplifier. Even though the load current signal bandwidth is dc, the input stage of any current-sense amplifier can rectify unwanted out-of-band noise that can result in an apparent error voltage at its output. This rectification of noise signals occurs because all amplifier input stages are constructed with transistors that can behave as high-frequency signal detectors in the same way P–N junction diodes were used as RF envelope detectors in early radio designs. The amplifier’s internal common-mode rejection is usually sufficient to defeat injected common-mode noise. To counter the effects of externally-injected noise, it has always been good engineering practice to add external low-pass filters in series with the inputs of a current-sense amplifier. In the design of discrete current-sense amplifiers, resistors used in the external lowpass filters were incorporated into the circuit’s overall design to compensate for any input-bias-current-generated offset voltage and gain errors. With the advent of monolithic current-sense amplifiers, the addition of external low-pass filters in series with the current-sense amplifier’s inputs only introduces additional offset voltage and gain errors. To minimize or altogether eliminate the need for external low-pass filters and to maintain low input offset voltage and gain errors, the current-sense amplifiers incorporate a 50 kHz (typ) 2nd-order differential low-pass filter as shown in the Block Diagrams. 2.4.8 Output Filter Capacitor If the current-sense amplifiers are a part of a signal acquisition system in which their OUT terminal is connected to the input of an ADC with an internal, switched-capacitor track-and-hold circuit, the internal track-and-hold’s sampling capacitor can cause voltage droop at VOUT. A good-quality 22 to 100 nF ceramic capacitor from the OUT terminal to GND forms a low-pass filter with the current-sense amplifier’s ROUT and should be used to minimize voltage droop (holding VOUT constant during the sample interval. Using a capacitor on the OUT terminal will also reduce the small-signal bandwidth as well as band-limiting amplifier noise. 2.4.9 PC Board Layout and Power Supply Bypassing For optimal circuit performance, the current-sense amplifiers should be in very close proximity to the external current-sense resistor, and the PCB tracks from RSENSE to the RS+ and the RS– input terminals should be short and symmetric. Also recommended are a ground plane and surface mount resistors and capacitors. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 6 TS1100/01/02/03 Data Sheet Electrical Characteristics 3. Electrical Characteristics Table 3.1. Recommended Operating Conditions1 Parameter Symbol Conditions Min Typ Max Units 1.25 5.5 V 2 27 V System Specifications Operating Voltage Range VDD Common-Mode Input Range VCM VRS+, Guaranteed by CMRR Note: 1. All devices 100% production tested at TA = +25 °C. Limits over Temperature are guaranteed by design and characterization. Table 3.2. DC Characteristics1 Parameter Symbol Conditions Min Typ Max Units IRS+ + IRS–2 TA = +25 °C — 0.68 0.85 µA — — 1.0 — — 1.0 — — 1.2 — 0.02 0.2 120 130 — dB TA = +25 °C — ±30 ±100 µV –40 °C < TA < +85 °C — — ±200 TA = +25 °C — ±30 ±200 –40 °C < TA < + 85 °C — — ±300 — 10 — µV TS110x-25 — 25 — V/V TS110x-50 — 50 — TS110x-100 — 100 — TS110x-200 — 200 — TA = +25 °C — ±0.1 ±0.6 % –40 °C < TA < +85 °C — ±1 % TA = +25 °C — ±0.6 % –40 °C < TA < +85 °C — ±1 % TS110x-25/50/100 28.0 40.0 52 kΩ TS110x-200 14.0 20.0 26.4 System Specifications No Load Input Supply Current VRS+ = 25 V TA = +25 °C IVDD Current Sense Amplifier Common Mode Rejection Ratio CMRR VOS Input Offset Voltage3 2 V < VRS+ < 27 V TS1100 and TS1101 TS1102 and TS1103 VOS Hysteresis4 VHYS Gain G GE Gain Error5 GM Gain Match5 Output Resistance6 ROUT silabs.com | Smart. Connected. Energy-friendly. TA = +25 °C TS1100, TS1101, TS1102, TS1103 ±0.2 Rev. 1.0 | 7 TS1100/01/02/03 Data Sheet Electrical Characteristics Parameter OUT Low Voltage Symbol VAOL Conditions Min Typ Max Units Gain = 25 — — 5 mV Gain = 50 — — 10 Gain = 100 — — 20 Gain = 200 — — 40 Gain = 25 — — 7.5 Gain = 50 — — 15 Gain = 100 — — 30 Gain = 200 — — 60 VOH = VRS– – VOUT — 0.05 0.2 V VDD = 1.25 V, ISINK = 5 µA — 0.2 V VDD = 1.8 V, ISINK = 35 µA — — VDD = 1.25 V, ISOURCE = 5 µA VDD – 0.2 — — V — — TS1100 and TS1101 TS1102 and TS1103 OUT High Voltage VAOH Sign Comparator Parameters (TS1106 Only) Output Low Voltage Output High Voltage VCOL VCOH VDD = 1.8 V, ISOURCE = 35 µA Notes: 1. VRS+ = 3.6 V; VSENSE = (VRS+ – VRS–) = 0 V; COUT = 47 nF; VDD = 1.8 V; TA = –40 °C to +105 °C, unless otherwise noted. Typical values are at TA = +25 °C. 2. Extrapolated to VOUT=0V. IRS++IRS- is the total current into the RS+ and the RS– pins. 3. Input offset voltage VOS is extrapolated from a VOUT(+) measurement with VSENSE set to +1 mV and a VOUT(–) measurement with VSENSE set to -1mV; vis-a-viz, Average VOS = (VOUT(–) – VOUT(+))/(2 x GAIN). 4. Amplitude of VSENSE lower or higher than VOS required to cause the comparator to switch output states. 5. Gain error is calculated by applying two values for VSENSE and then calculating the error of the actual slope vs. the ideal transfer characteristic. TS1100 and TS1102 only applies positive VSENSE values. For GAIN = 25, the applied VSENSE is 20 mV and 120 mV. For GAIN = 50, the applied VSENSE is 10 mV and 60 mV. For GAIN = 100, the applied VSENSE is 5 mV and 30 mV. For GAIN = 200, the applied VSENSE is 2.5 mV and 15 mV. 6. The device is stable for any capacitance load at VOUT. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 8 TS1100/01/02/03 Data Sheet Electrical Characteristics Table 3.3. AC Characteristics1 Parameter Symbol Conditions Min Typ Max Units Gain = 25, 50, 100 — 2.2 — msec Gain = 200 — 4.3 — msec VSENSE = ±1 mV — 3 — msec VSENSE = ±10 mV — 0.4 — msec Current Sense Amplifier Output Settling time tOUT_s 1% Final value, VOUT = 3 V Sign Comparator Parameters (TS1101 and TS1103 Only) Propagation Delay tSIGN_PD Notes: 1. VRS+ = 3.6 V; VSENSE = (VRS+ – VRS–) = 0 V; COUT = 47 nF; VDD = 1.8 V; TA = –40 °C to +105 °C, unless otherwise noted. Typical values are at TA = +25 °C. Table 3.4. Thermal Conditions Parameter Symbol Operating Temperature Range TOP Conditions Min Typ Max Units –40 — +105 °C Table 3.5. Absolute Maximum Limits Parameter Symbol Conditions Min Typ Max Units RS+ Voltage VRS+ –0.3 — 27 V RS– Voltage VRS– –0.3 — 27 V Supply Voltage VDD –0.3 — 6 V OUT Voltage VOUT –0.3 — 6 V SIGN Voltage (TS1106 Only) VSIGN –0.3 — 6 V VRS+ – VRS– — — 28 V Short Circuit Duration: OUT to GND — — Continuous Continuous Input Current (Any Pin) –20 — 20 mA — — 150 °C –65 — 150 °C Lead Temperature (Soldering, 10 s) — — 300 °C Soldering Temperature (Reflow) — — 260 °C Human Body Model — — 2000 V Machine Model — — 200 V RS+ to RS– Voltage Junction Temperature Storage Temperature Range ESD Tolerance silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 9 TS1100/01/02/03 Data Sheet Electrical Characteristics For the following graphs, VRS+ = VRS– = 3.6 V; TA = +25 C unless otherwise noted. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 10 TS1100/01/02/03 Data Sheet Electrical Characteristics silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 11 TS1100/01/02/03 Data Sheet Electrical Characteristics silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 12 TS1100/01/02/03 Data Sheet Pin Descriptions 4. Pin Descriptions Table 4.1. Pin Descriptions Pin Part Number Label Function 1 TS1100 GND Ground. Connect this pin to analog ground. GND Ground. Connect this pin to analog ground. SIGN Comparator Output, push-pull; SIGN is HIGH for (VRS+ > VRS–) and LOW for (VRS– > VRS+). OUT Output Voltage. VOUT is proportional to VSENSE = (VRS+ – VRS–) or (VRS– – VRS+). RS– External Sense Resistor Load-Side Connection RS+ External Sense Resistor Power-Side Connection VDD SIGN Comparator External Power Supply Pin; Connect this pin to system’s logic VDD supply. N/A N/A RS+ External Sense Resistor Power-Side Connection TS1101 TS1102 TS1103 2 TS1100 TS1102 TS1101 TS1103 3 TS1100 TS1101 TS1102 TS1103 4 TS1100 TS1101 TS1102 TS1103 5 TS1100 TS1102 TS1101 TS1103 6 TS1100 TS1102 TS1101 TS1103 silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 13 TS1100/01/02/03 Data Sheet Packaging 5. Packaging 5.1 TS1100 and TS1102 Package Dimensions Figure 5.1. TS1100 and TS1102 Package Diagram Table 5.1. TS1100 and TS1102 Package Dimensions Dimension Min Max A — 1.45 A1 0.00 0.15 A2 0.90 1.30 b 0.30 0.50 c 0.09 0.20 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e 0.95 BSC e1 1.90 BSC L 0.30 L2 θ 0.60 0.25 BSC 0° 8° aaa 0.15 bbb 0.20 ccc 0.10 ddd 0.20 silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 14 TS1100/01/02/03 Data Sheet Packaging Dimension Min Max Note: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. Recommended card reflow profile is per the JEDEC/IPC J-STD-020D specification for Small Body Components. 4. This drawing conforms to the JEDEC Solid State Outline MO-178, Variation AA. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 15 TS1100/01/02/03 Data Sheet Packaging 5.2 TS1101 and TS1103 Package Dimensions Figure 5.2. TS1101 and TS1103 Package Diagram Table 5.2. TS1101 and TS1103 Package Dimensions Dimension Min Max A1 0.06 0.15 A2 1.00 1.30 b 0.35 0.50 c 0.127 D 2.80 2.90 E 2.60 3.00 E1 1.50 1.70 e1 L 0.950 TYP 0.35 L2 θ1 θ2 0.55 0.20 BSC 0° 3° 10° TYP Note: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. Recommended card reflow profile is per the JEDEC/IPC J-STD-020D specification for Small Body Components. 4. This drawing conforms to the JEDEC Solid State Outline MO-178, Variation AA. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 16 TS1100/01/02/03 Data Sheet Top and Bottom Marking: 5 and 6-Pin Packages 6. Top and Bottom Marking: 5 and 6-Pin Packages Mark Method: Laser Font Size: 0.60 mm (24 mils) Line 1 Mark Format: Device Identifier TADT Line 5 Backside: TTTT = Mfg Code Manufacturing Code from the Assembly Purchase Order Form Mark Method: Laser Font Size: 0.60 mm (24 mils) Line 1 Mark Format: Device Identifier TADT Line 5 Backside: TTTT = Mfg Code Manufacturing Code from the Assembly Purchase Order Form silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 17 Table of Contents 1. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1 Typical Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.2 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.3 SIGN Comparator Output . . . . . . . . . . . . . . . . . . . . . . . . . . 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 Choosing the Sense Resistor. . . . . . . . . . . . . . 2.4.1 RSENSE Voltage Loss. . . . . . . . . . . . . . . . 2.4.2 VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE 2.4.3 Total Load Current Accuracy . . . . . . . . . . . . . 2.4.4 Circuit Efficiency and Power Dissipation . . . . . . . . . 2.4.5 RSENSE Kelvin Connections . . . . . . . . . . . . . 2.4.6 RSENSE Composition . . . . . . . . . . . . . . . . 2.4.7 Internal Noise Filter . . . . . . . . . . . . . . . . 2.4.8 Output Filter Capacitor . . . . . . . . . . . . . . . 2.4.9 PC Board Layout and Power Supply Bypassing . . . . . . . 5 5 5 5 5 6 6 6 6 6 3. Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5. Packaging 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 TS1100 and TS1102 Package Dimensions . . . . . . . . . . . . . . . . . . . .14 5.2 TS1101 and TS1103 Package Dimensions . . . . . . . . . . . . . . . . . . . .16 6. Top and Bottom Marking: 5 and 6-Pin Packages . . . . . . . . . . . . . . . . . 17 Table of Contents 18 Smart. Connected. Energy-Friendly Products Quality Support and Community www.silabs.com/products www.silabs.com/quality community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. 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