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LM27402 Folha de dados(PDF) 5 Page - Texas Instruments |
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LM27402 Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 48 page LM27402 www.ti.com SNVS615J – JANUARY 2010 – REVISED JULY 2015 6.3 Recommended Operating Conditions MIN MAX UNIT VDD powered by internal LDO 3.0 20 VIN(1) V VDD tied to VIN 3.0 5.5 VDD 2.2 5.5 V SS/TRACK, SYNC, EN 0 VVDD V PGOOD 0 5.5 V Junction Temperature –40 125 °C (1) VDD is the output of an internal linear regulator. Under normal operating conditions where VIN is greater than 5.5 V, VDD must not be connected to any external voltage source. In an application where VIN is between 3.0 V and 5.5 V, connecting VIN to VDD maximizes the bias supply rail voltage. In order to have better noise rejection under these conditions, a 1- Ω and 1-µF RC input filter to VDD may be used. 6.4 Thermal Information LM27402 THERMAL METRIC(1) RUM (WQFN) PWP (HTSSOP) UNIT 16 PINS 16 PINS RθJA Junction-to-ambient thermal resistance 35.3(2) 39.8(2) °C/W RθJC(top) Junction-to-case (top) thermal resistance 32.7 25.6 °C/W RθJB Junction-to-board thermal resistance 12.9 18.8 °C/W ψJT Junction-to-top characterization parameter 0.3 0.7 °C/W ψJB Junction-to-board characterization parameter 13.0 18.6 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance 3.3 2.5 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. (2) Tested on a four layer JEDEC board. Four vias are provided under the WQFN exposed pad and nine vias are provided under the HTSSOP exposed pad. 6.5 Electrical Characteristics Unless otherwise stated, the following conditions apply: VVIN = 12 V. Limits in standard type are for TJ = 25°C only. Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C and are provided for reference purposes only. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OPERATIONAL SPECIFICATIONS VFB = 0.6 V (not switching), TJ = 25°C 4.5 IQ Quiescent Current mA VFB = 0.6 V (not switching), TJ = –40°C 6 to +125°C VEN = 0 V, TJ = 25°C 25 IQSD Quiescent Current In Shutdown µA VEN = 0 V, TJ = –40°C to +125°C 45 UVLO VVIN Rising, VVDD Rising, TJ = 25°C 2.9 UVLO Input Under Voltage Lockout V VVIN Rising, VVDD Rising, TJ = –40°C to 2.7 2.99 +125°C UVLOHYS UVLO Hysteresis VVIN Falling, VVDD Falling 300 mV REFERENCE TJ = 25°C 0.600 VFB Feedback Voltage V TJ = –40°C to +125°C 0.594 0.606 IFB Feedback Pin Bias Current VFB = 0.65 V –50 0 50 nA Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM27402 |
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