MAX9922/MAX9923 19-4429 Rev 1 1/10 Ultra-Precision, High-Side Current-Sense Amplifiers General Description Features The MAX9922/MAX9923 ultra-precision, high-side cur- Ultra-Precision V Over Temperature OS rent-sense amplifiers feature ultra-low offset voltage MAX9922: 10V (max) (V ) of 25V (max) and laser-trimmed gain accuracy OS MAX9923T: 25V (max) better than 0.5%. The combination of low V and high- OS MAX9923H: 20V (max) gain accuracy allows precise current measurements MAX9923F: 10V (max) even at very small sense voltages. 0.5% (max) Full-Scale Gain Accuracy The MAX9922/MAX9923 are capable of both unidirec- tional and bidirectional operation. For unidirectional Bidirectional or Unidirectional I SENSE operation, connect REF to GND. For bidirectional oper- Multiple Gains Available ation, connect REF to V /2. DD Adjustable (MAX9922) The MAX9922 has adjustable gain set with two external +25V/V (MAX9923T) resistors. The MAX9923T/MAX9923H/MAX9923F use an +100V/V (MAX9923H) internal laser-trimmed resistor for fixed gain of 25V/V, +250V/V (MAX9923F) 100V/V, and 250V/V, respectively. The devices operate from a +2.85V to +5.5V single supply, independent 1.9V to 28V Input Common-Mode Voltage, of the input common-mode voltage, and draw only 700A Independent of V DD operating supply current and less than 1A in shutdown. Supply Voltage: +2.85V to +5.5V The +1.9V to +28V current-sense input common-mode 700A Supply Current, 1A Shutdown Current voltage range makes the MAX9922/MAX9923 ideal for current monitoring in applications where high accuracy, Extended Temperature Range (-40C to +85C) large common-mode measurement range, and mini- mum full-scale V voltage is critical. Available in Space-Saving 10-Pin MAX SENSE The MAX9922/MAX9923 use a spread-spectrum autozeroing technique that constantly measures and cancels the input offset voltage, eliminating drift over Ordering Information time and temperature, and the effect of 1/f noise. This, PIN- TEMP in conjunction with the indirect current-feedback tech- PART GAIN (V/V) PACKAGE RANGE nique, achieves less than 25V (max) offset voltage. MAX9922EUB+ 10 MAX - 40C to + 85 C Adjustable The MAX9922/MAX9923 are available in a small 10-pin MAX9923TEUB+ 10 MAX - 40C to + 85 C 25 MAX package and are specified over the -40C to +85C extended temperature range. MAX9923HEUB+ 10 MAX - 40C to + 85 C 100 MAX9923FEUB+ 10 MAX - 40C to + 85 C 250 Applications +Denotes a lead(Pb)-free/RoHS-compliant package. Notebook/Desktop Power Management Handheld Li+ Battery Current Monitoring Pin Configuration Precision Current Sources TOP VIEW + RSB 1 10 V DD RS+ 2 9 OUT MAX9922 Typical Operating Circuits appear at end of data sheet. RS- 3 8 FB MAX9923T MAX9923H N.C. 4 7 REF MAX9923F MAX is a registered trademark of Maxim Integrated Products, Inc. GND 5 6 SHDN MAX Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEUltra-Precision, High-Side Current-Sense Amplifiers ABSOLUTE MAXIMUM RATINGS RSB, RS+, RS- to GND...........................................-0.3V to +30V Current into Any Pin..........................................................20mA V to GND..............................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DD A OUT, REF, FB, SHDN 10-Pin MAX (derate 4.5mW/C above +70C) ...........362mW to GND .................-0.3V to the lower of (V + 0.3V) and +6V Operating Temperature Range ...........................-40C to +85C DD OUT Short Circuit to V or GND ..............................Continuous Junction Temperature......................................................+150C DD Differential Voltage (V - V ), (V - V ), Storage Temperature Range .............................-65C to +150C RS+ RS- RSB RS+ (V - V ) ...................................................................5.5V Lead Temperature (soldering, 10s) .................................+300C RSB RS- 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 (V = V = V +12V, V = +3.3V, V = 0V, V = V /2 for bidirectional, V = 0V for unidirectional, V = V - V RSB RS+ RS- = DD GND REF DD REF SENSE RS+ RS- 0V, MAX9922 is set for A =100V/V (R1 = 1k, R2 = 99k), SHDN = V , T = -40C to +85C, unless otherwise noted. Typical values = V DD A are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS MAX9922 (A = 100), V = 0V, V SENSE 0.1 10 V = V /2, -40C T +85C REF DD A MAX9923T, V = 0V, V = V /2, SENSE REF DD 0.2 25 -40C T +85C A Input Offset Voltage V V OS (Notes 2, 3) MAX9923H, V = 0V, V = V /2 SENSE REF DD 0.2 20 -40C T +85C A MAX9923F, V = 0V, V = V /2, SENSE REF DD 0.1 10 -40C T +85C A MAX9922 (A = 100V/V), V = 0V, V SENSE 0.05 V = V /2, -40C T +85C REF DD A MAX9923T, V = 0V, V = V /2, SENSE REF DD 0.20 Input Offset Voltage -40C T +85C A TCV V/C OS Temperature Drift (Notes 2, 4) MAX9923H, V = 0V, V = V /2, SENSE REF DD 0.10 -40C T +85C A MAX9923F, V = 0V, V = V /2, SENSE REF DD 0.05 -40C T +85C A Input Common-Mode Range V Guaranteed by CMRR 1.90 28.00 V CMR 1.9V V 28V, -40C T +85C RS+ A Input Common-Mode Rejection CMRR 121 140 dB (Note 2) MAX9922 Adj MAX9923T 25 A Gain V V/V MAX9923H 100 MAX9923F 250 2 MAX9922/MAX9923