TPS61390 Datasheet | Texas Instruments

Features - 1 Input voltage range: 2.5 V to 5.5 V - Output voltage range: up to 85 V - R(DS)on of switching FET: 0.9 Ω - Switch current limit: 1000 m A - Sample window with minimum 400-ns - High optical power protection with 0.5-µs response time - Switching frequency: 700 k Hz - Quiescent current: 110 µA from VIN, 340 µA from VOUT, 140 µA from AVCC - Soft-start time: 4.8 ms - Package: 3 mm × 3 mm × 0.75 mm QFN 2 Applications - APD bias - Optical line terminal - High-voltage sensor supply 3 Description The TPS61390 is a 700-k Hz pulse-width modulating (PWM) step-up converter with an 85-V switch FET with an input ranging from 2.5 V to 5.5 V. The switching peak current is up to 1000 m A. The TPS61390 includes accurate current mirror with two gain options selectable (1 : 5 or 4 : 5). Additionally, the TPS61390 integrates a sample-andhold circuitry for the burst-mode optical receiver applications to capture the current flowing through the APD and pass the current to an external ADC. The device supports fast response time during the transition between strong and weak optical density. The TPS61390 also provides high optical-power protection with an additional FET in series with the APD power path with the typical response time of 0.5 µs . It can recover automatically once the high optical releasing. The TPS61390 is available in 3 mm × 3 mm QFN package with exposed pad underneath. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) WQFN (16) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Circuit Diode VOUT ON OFF CCAP RSVCC CAVCC To ADC 4:5 1:5 VIN EN...