TPS3840 Datasheet PDF


Part Number

TPS3840

Description

High Input Voltage Supervisor

Manufacture

etcTI

Total Page 30 Pages
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Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity TPS3840 SNVSB03C – DECEMBER 2 018 – REVISED AUGUST 2019 TPS3840 Nan o Power, High Input Voltage Supervisor With MR and Programmable Delay 1 Featu res •1 Wide operating voltage: 1.5 V to 10 V • Nano supply current: 300 nA (Typ), 700 nA (Max) • Fixed threshol d voltage (VIT-) – Threshold from 1.6 V to 4.9 V in 0.1-V steps – High acc uracy: 1% (Typ), 1.5% (Max) – Built-i n hysteresis (VIT+) – 1.6 V < VIT- 3.0 V = 100 mV (Typical) – 3.1 V VIT- < 4.9 V = 200 mV (Typical) • S tart-up delay (tSTRT): 220 µs (Typ), 3 50 µs (Max) • Programmable reset tim e delay (tD): – 50 µs (no capacitor) to 6.2 s (10-µF) • Active-low.
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TPS3840 Datasheet
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TPS3840
SNVSB03C – DECEMBER 2018 – REVISED AUGUST 2019
TPS3840 Nano Power, High Input Voltage Supervisor With MR and Programmable Delay
1 Features
1 Wide operating voltage: 1.5 V to 10 V
• Nano supply current: 300 nA (Typ), 700 nA (Max)
• Fixed threshold voltage (VIT-)
– Threshold from 1.6 V to 4.9 V in 0.1-V steps
– High accuracy: 1% (Typ), 1.5% (Max)
– Built-in hysteresis (VIT+)
– 1.6 V < VIT- 3.0 V = 100 mV (Typical)
– 3.1 V VIT- < 4.9 V = 200 mV (Typical)
• Start-up delay (tSTRT): 220 µs (Typ), 350 µs (Max)
• Programmable reset time delay (tD):
– 50 µs (no capacitor) to 6.2 s (10-µF)
• Active-low manual reset (MR)
• Three output topologies:
– TPS3840DL: open-drain, active-low (RESET),
requires pull-up resistor
– TPS3840PL: push-pull, active-low (RESET)
– TPS3840PH: push-pull, active-high (RESET)
• Wide temperature range: –40°C to +125°C
• Package: SOT23-5 (DBV)
2 Applications
• Grid infrastructure: circuit breaker, smart meter,
other monitoring and protection equipment
• Factory automation: field transmitter, PLC.
• Building automation: fire safety, smoke detector,
and HVAC
• Electronic point of sale
• Portable, battery-powered systems
3 Description
Wide Vin allows monitoring 9V rails or batteries
without external components and 24V rails with
external resistors. Nano-Iq extends battery life for low
power applications and minimizes current
consumption when using external resistors. Fast
start-up delay allows the detection of a voltage fault
before the rest of the system powers up providing
maximum safety in hazardous start-up fault
conditions. Low Power-on-Reset (VPOR) prevents
false resets, premature enable or turn-on of next
device, and proper transistor control during power-up
and power-down.
Reset output signal is asserted when the voltage at
VDD drops below the negative voltage threshold (VIT-)
or when manual reset (MR) is pulled to a low logic
(VMR_L). Reset signal is cleared when VDD rise above
VIT- plus hysteresis (VIT+) and manual reset is floating
or above VMR_H and the reset time delay (tD) expires.
Reset time delay can be programmed by connecting
a capacitor between CT pin and ground. For a fast
reset CT pin can be left floating.
Additional features: Built-in glitch immunity protection
for MR and VDD, built-in hysteresis, low open-drain
output leakage current (ILKG(OD)).
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS3840
SOT-23 (5) (DBV) 2.90 mm × 1.60 mm
(1) For package details, see the mechanical drawing addendum
at the end of the data sheet.
Typical Application Circuit
9V
1 µF
VDD
MR RESET
TPS3840DL49
CT GND
Vin Vout
DC/DC
EN
5V
TPS3840 Typical Supply Current
0.5
DL49
PL49
0.4 PH49
0.3
0.2
0.1
0
1 2 3 4 5 6 7 8 9 10
VDD (V)
IDDv
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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