Datasheet MAX4373, MAX4374, MAX4375 (Maxim) - 9
| Manufacturer | Maxim |
| Description | Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs |
| Pages / Page | 13 / 9 — Pin Description. PIN. MAX4373. MAX4374/MAX4375. NAME. FUNCTION. µMAX/SO. … |
| File Format / Size | PDF / 302 Kb |
| Document Language | English |
Pin Description. PIN. MAX4373. MAX4374/MAX4375. NAME. FUNCTION. µMAX/SO. µMAX. Detailed Description. Current-Sense Amplifier
Model Line for this Datasheet
Text Version of Document
MAX4373/MAX4374/MAX4375 Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs
Pin Description PIN MAX4373 MAX4374/MAX4375 NAME FUNCTION µMAX/SO µMAX SO FUNCTION
1 1 1 VCC Supply Voltage Input 2 2 2 OUT Voltage Output. VOUT is proportional to VSENSE (VRS+ - VRS-). Comparator Input 1. Positive input of an internal comparator. The nega- 3 3 4 CIN1 tive terminal is connected to a 0.6V internal reference. Comparator Input 2. Terminal of a second internal comparator. The pos- — 4 5 CIN2 itive terminal for the MAX4374 and the negative terminal for the MAX4375. The other terminal is connected to a 0.6V internal reference. 4 5 7 GND Ground 5 6 8 RESET Reset Input. Resets the output latch of the comparator at CIN1. Open-Drain Comparator Output. Latching output of the comparator con- 6 8 11 COUT1 trolled by CIN1. Connect RESET to GND to disable the latch. Open-Drain Comparator Output. Output of the second unlatched inter- — 7 10 COUT2 nal comparator. 7 9 13 RS- Load-Side Connection for the External Sense Resistor 8 10 14 RS+ Power Connection to the External Sense Resistor — — 3, 6, 9, 12 N.C. No Connection. Not internally connected. + VSENSE -
Detailed Description
VIN = 0 TO 28V R The MAX4373 high-side current-sense supervisor fea- SENSE tures a high-side current-sense amplifier, bandgap ref- LOAD RS+ RS- erence, and comparator with latching output to monitor VCC a supply for an overcurrent condition (Figure 1). The latching output allows the comparator to shut down a CURRENT- OUT SENSE power supply without oscillations. The MAX4374/ VPULL-UP AMPLIFIER MAX4375 offer an additional comparator to allow win- (UP TO 5V) R1 R4 R3 CIN1 dow detection of the current. COUT1 + VPULL-UP - (UP TO 5V) RESET R2
Current-Sense Amplifier
R6 CIN2 The internal current-sense amplifier features a 0V to COUT2 +(-) -(+) +28V input common-mode range that is independent of R5 the supply voltage. With this feature, the device can 0.6V BANDGAP monitor the output current of a battery in deep dis- REFERENCE charge and also high-side current-sensing voltages exceeding VCC. MAX4374 (MAX4375) The current-sense amplifier is also suitable for low-side GND current sensing. However, the total output voltage error will increase when VRS+ falls below 2V, as shown in the Electrical Characteristics and Typical Operating Figure 1. Functional Diagram Characteristics. www.maximintegrated.com Maxim Integrated | 9
Pin Description PIN MAX4373 MAX4374/MAX4375 NAME FUNCTION µMAX/SO µMAX SO FUNCTION
1 1 1 VCC Supply Voltage Input 2 2 2 OUT Voltage Output. VOUT is proportional to VSENSE (VRS+ - VRS-). Comparator Input 1. Positive input of an internal comparator. The nega- 3 3 4 CIN1 tive terminal is connected to a 0.6V internal reference. Comparator Input 2. Terminal of a second internal comparator. The pos- — 4 5 CIN2 itive terminal for the MAX4374 and the negative terminal for the MAX4375. The other terminal is connected to a 0.6V internal reference. 4 5 7 GND Ground 5 6 8 RESET Reset Input. Resets the output latch of the comparator at CIN1. Open-Drain Comparator Output. Latching output of the comparator con- 6 8 11 COUT1 trolled by CIN1. Connect RESET to GND to disable the latch. Open-Drain Comparator Output. Output of the second unlatched inter- — 7 10 COUT2 nal comparator. 7 9 13 RS- Load-Side Connection for the External Sense Resistor 8 10 14 RS+ Power Connection to the External Sense Resistor — — 3, 6, 9, 12 N.C. No Connection. Not internally connected. + VSENSE -
Detailed Description
VIN = 0 TO 28V R The MAX4373 high-side current-sense supervisor fea- SENSE tures a high-side current-sense amplifier, bandgap ref- LOAD RS+ RS- erence, and comparator with latching output to monitor VCC a supply for an overcurrent condition (Figure 1). The latching output allows the comparator to shut down a CURRENT- OUT SENSE power supply without oscillations. The MAX4374/ VPULL-UP AMPLIFIER MAX4375 offer an additional comparator to allow win- (UP TO 5V) R1 R4 R3 CIN1 dow detection of the current. COUT1 + VPULL-UP - (UP TO 5V) RESET R2
Current-Sense Amplifier
R6 CIN2 The internal current-sense amplifier features a 0V to COUT2 +(-) -(+) +28V input common-mode range that is independent of R5 the supply voltage. With this feature, the device can 0.6V BANDGAP monitor the output current of a battery in deep dis- REFERENCE charge and also high-side current-sensing voltages exceeding VCC. MAX4374 (MAX4375) The current-sense amplifier is also suitable for low-side GND current sensing. However, the total output voltage error will increase when VRS+ falls below 2V, as shown in the Electrical Characteristics and Typical Operating Figure 1. Functional Diagram Characteristics. www.maximintegrated.com Maxim Integrated | 9
