TPS3850

The TPS3850 is an electronic component from Texas Instruments. View the full TPS3850 datasheet below including electrical characteristics, absolute maximum ratings.

Manufacturer

Texas Instruments

Overview

The TPS3850 combines a precision voltage supervisor with a programmable window watchdog timer. The TPS3850 window comparator achieves 0.8% accuracy (-40°C to +125°C) for both overvoltage (VIT+(OV) ) and undervoltage (VIT-(UV) ) thresholds on the SENSE pin. The TPS3850 also includes accurate hysteresis on both thresholds, making the device ideal for use with tight tolerance systems. The supervisor RESET delay can be set by factory-programmed default delay settings, or programmed by an external capacitor. The factoryprogrammed RESET delay features a 9.5% accuracy, high-precision delay timing.

The TPS3850 includes a programmable window watchdog timer for a wide variety of applications. The dedicated watchdog output ( WDO) enables increased resolution to help determine the nature of fault conditions. The window watchdog timeouts can be set by factory-programmed default delay settings, or programmed by an external capacitor. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3850 is available in a small 3.00-mm × 3.00-mm, 10-pin VSON package.

Features

Input voltage range: VDD = 1.6 V to 6.5 V
0.8% Voltage threshold accuracy
Low supply current: I DD = 10 μA (typical)
User-programmable watchdog timeout
User-programmable reset delay
Factory-programmed precision watchdog and reset timers
Open-drain outputs
Precision over- and undervoltage monitoring:
-Supports common rails from 0.9 V to 5.0 V
-±4% and ±7% Fault windows available
-0.5% Hysteresis
Watchdog disable feature
Available in a small 3-mm × 3-mm, 10-Pin VSON package
Junction operating temperature range: -40°C to +125°C

Applications

Fully Integrated Microcontroller Supervisory Circuit

Fully Integrated Microcontroller Supervisory Circuit

Pin Configuration

Figure 5-1. DRC Package: TPS3850 3-mm × 3-mm VSON-10 Top View

Electrical Characteristics

at 1.6 V ≤ V DD ≤ 6.5 V over the operating temperature range of -40°C ≤ TJ ≤ +125°C (unless otherwise noted); the open-drain pullup resistors are 10 kΩ for each output; typical values are at T J = 25°C

PARAMETER	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
GENERAL CHARACTERISTICS	GENERAL CHARACTERISTICS	GENERAL CHARACTERISTICS	GENERAL CHARACTERISTICS	GENERAL CHARACTERISTICS	GENERAL CHARACTERISTICS	GENERAL CHARACTERISTICS
V DD (1) (2) (3)	Supply voltage		1.6		6.5	V
I DD	Supply current			10	19	μA
RESET FUNCTION	RESET FUNCTION	RESET FUNCTION	RESET FUNCTION	RESET FUNCTION	RESET FUNCTION	RESET FUNCTION
V POR (2)	Power-on reset voltage	I RESET = 15 μA, V OL(MAX) = 0.25 V			0.8	V
V UVLO (1)	Undervoltage lockout voltage			1.35		V
V IT+(OV)	Overvoltage SENSE threshold accuracy, entering RESET		V IT+(nom) -0.8%		V IT+(nom) +0.8%
V IT-(UV)	Undervoltage SENSE threshold accuracy, entering RESET		V IT-(nom) -0.8%		V IT-(nom) +0.8%
V IT(ADJ)	Falling SENSE threshold voltage, adjustable version only		0.3968	0.4	0.4032	V
V HYST	Hysteresis voltage		0.2%	0.5%	0.8%
I CRST	CRST pin charge current	CRST = 0.5 V	347	375	403	nA
V CRST	CRST pin threshold voltage		1.196	1.21	1.224	V
WINDOW WATCHDOG FUNCTION	WINDOW WATCHDOG FUNCTION	WINDOW WATCHDOG FUNCTION	WINDOW WATCHDOG FUNCTION	WINDOW WATCHDOG FUNCTION	WINDOW WATCHDOG FUNCTION	WINDOW WATCHDOG FUNCTION
I CWD	CWD pin charge current	CWD = 0.5 V	347	375	403	nA
V CWD	CWD pin threshold voltage		1.196	1.21	1.224	V
V OL	RESET, WDO output low	VDD = 5 V, I SINK = 3 mA			0.4	V
I D	RESET, WDO output leakage current	VDD = 1.6 V, V RESET, = V WDO = 6.5 V			1	μA
V IL	Low-level input voltage (SET0, SET1)				0.25	V
V IH	High-level input voltage (SET0, SET1)		0.8			V
V IL(WDI)	Low-level input voltage (WDI)				0.3 × V DD	V
V IH(WDI)	High-level input voltage (WDI)		0.8 × V DD			V
I SENSE		TPS3850Xyy(y), V SENSE = 5.0 V, VDD = 3.3 V		2.1	2.5	μA
I SENSE	SENSE pin idle current	TPS3850H01 only, V SENSE = 5.0 V, VDD = 3.3 V	-50		50	nA

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Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

		MIN	MAX	UNIT
Supply voltage range	VDD	-0.3	7	V
Output voltage range	RESET, WDO	-0.3	7	V
Voltage ranges	SET0, SET1, WDI, SENSE	-0.3	7	V
Voltage ranges	CWD, CRST	-0.3	VDD + 0.3 (3)	V
Output pin current	RESET, WDO		±20	mA
Input current (all pins)	Input current (all pins)		±20	mA
Continuous total power dissipation	Continuous total power dissipation	See Section 6.4	See Section 6.4
Temperature	Operating junction, T J (2)	-40	150	°C
Temperature	Operating free-air temperature, T A (2)	-40	150	°C
Temperature	Storage, T stg	-65	150	°C

(2) TJ = TA as a result of the low dissipated power in this device.

(3) The absolute maximum rating is VDD + 0.3 V or 7.0 V, whichever is smaller.

Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

		MIN	NOM	MAX	UNIT
VDD	Supply pin voltage	1.6		6.5	V
V SENSE	Input pin voltage	0		6.5	V
V SET0	SET0 pin voltage	0		6.5	V
V SET1	SET1 pin voltage	0		6.5	V
C CRST	RESET delay capacitor	0.1 (1)		1000 (1)	nF
CRST	Pullup resistor to VDD	9	10	11	kΩ
C CWD	Watchdog timing capacitor	0.1 (2)		1000 (2)	nF
CWD	Pullup resistor to VDD	9	10	11	kΩ
R PU	Pullup resistor, RESET and WDO	1	10	100	kΩ
I RST	RESET pin current			10	mA
I WDO	Watchdog output current			10	mA
T J	Junction Temperature	-40		125	°C

Thermal Information

THERMAL METRIC (1)	THERMAL METRIC (1)	TPS3850 DRC (VSON) 10 PINS	UNIT
R θJA	Junction-to-ambient thermal resistance	52.3	°C/W
R θJC(top)	Junction-to-case (top) thermal resistance	59.7	°C/W
R θJB	Junction-to-board thermal resistance	26.1	°C/W
ψ JT	Junction-to-top characterization parameter	1.7	°C/W
ψ JB	Junction-to-board characterization parameter	26	°C/W
R θJC(bot)	Junction-to-case (bottom) thermal resistance	9.7	°C/W

Typical Application

The following sections describe in detail proper device implementation, depending on the final application requirements.

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
TPS3850-Q1	Texas Instruments	—
TPS3850G12	Texas Instruments	—
TPS3850H01	Texas Instruments	—
TPS3850XYY	Texas Instruments	—

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