Texas Instruments TPS3619-33DGKRG4

Overview

TPS3619-33DGKRG4 from Texas Instruments is a backup-battery supervisor IC for CMOS RAM retention, featuring precision 3.3 V supply monitoring (VIT = 2.93 V typ), 100-ms power-on reset delay, and dual-supply switchover between VDD and VBAT. It delivers 40 µA max supply current, 100 nA max battery-current, and supports VBAT > VDD operation in portable battery-powered equipment.

For engineers reviewing the TPS3619-33DGKRG4 datasheet, TPS3619-33DGKRG4 pinout, TPS3619-33DGKRG4 application, or TPS3619-33DGKRG4 equivalent, key selection criteria include its battery-freshness seal function, PFI/PFO power-fail detection capability, VDD-to-VOUT rDS(on) ≤ 1 Ω, and MSOP-8 package compatibility with space-constrained embedded systems.

Technical Context

The TPS3619-33DGKRG4 integrates a precision voltage monitor with 2.93 V threshold (±2.5% over –40°C to +85°C), a 100-ms internal reset timer, and independent PFI comparator referenced to 1.15 V. Its switchover logic uses two PMOS switches - one for VDD-to-VOUT (rDS(on) ≤ 1 Ω), another for VBAT-to-VOUT (rDS(on) ≤ 15 Ω) - activated only when VDD falls below VIT and VBAT exceeds VDD.

It implements a battery freshness seal that isolates VBAT until first power-up, preventing pre-deployment discharge. The MR input enables manual reset with 100 ns/V minimum slew rate immunity, while RESET and PFO outputs are open-drain with 0.4 V max VOL at 2 mA and VDD–0.4 V min VOH at 2 mA.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package, 3.05 mm × 4.98 mm footprint, 1.1 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar backup-battery supervisor applications.

Compared with TPS3620-33DGKR, TPS3619-33DGKRG4 omits watchdog functionality but achieves 40× lower VBAT current; versus MAX819MESA+, it adds battery freshness seal and cuts supply current by 4×, enabling longer shelf life and deeper sleep modes.

Availability

TPS3619-33DGKRG4 is available at Aetrix Electronics and suitable for portable battery-powered equipment, fax machines, set-top boxes, and automotive infotainment systems requiring stable component supply and long-term RAM retention.

Supply support for TPS3619-33DGKRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability supervisory circuits.

The TPS3619 family is designed specifically for backup-battery switchover in CMOS RAM applications, emphasizing ultra-low battery drain, precision voltage thresholds, and robust power-fail detection in compact MSOP packages.

FAQ

What is the exact reset threshold voltage for TPS3619-33DGKRG4?

The TPS3619-33DGKRG4 has a nominal reset threshold voltage (VIT) of 2.93 V, with guaranteed range of 2.88 V to 3.00 V over –40°C to +85°C. This value is factory-trimmed and specified in the Electrical Characteristics table of the SLVS387H datasheet. The TPS3619-33DGKRG4 uses this threshold to assert RESET when VDD falls below VIT and release it after VDD rises above VIT plus 100-ms delay.

Does TPS3619-33DGKRG4 support VBAT higher than VDD?

Yes, the TPS3619-33DGKRG4 explicitly supports VBAT exceeding VDD - a core feature for lithium backup cells (e.g., 3.6 V) used with 3.3 V systems. VBAT connects to VOUT only when VDD drops below VIT and VBAT > VDD; otherwise, VBAT remains isolated. This prevents backfeeding and enables safe operation with mismatched supply voltages, as confirmed in the Functional Block Diagram and DETAILED DESCRIPTION section.

How does the battery freshness seal work on TPS3619-33DGKRG4?

The battery freshness seal in the TPS3619-33DGKRG4 disconnects VBAT from internal circuitry until first power-up. To activate, apply VDD > VIT for 5–35 ms while grounding PFO and connecting PFI to VDD. The seal is automatically removed by the rising edge of RESET. This prevents pre-deployment discharge, extending shelf life - a feature absent in TPS3620 and MAX819 variants.

What are the absolute maximum ratings for VDD and VBAT on TPS3619-33DGKRG4?

The TPS3619-33DGKRG4 has an absolute maximum VDD rating of 7 V and VBAT rating of 7 V, though recommended operating range is 1.65 V to 5.5 V for both. Continuous operation at 7 V is limited to ≤1000 hours per the Absolute Maximum Ratings table. Exceeding these stresses may cause permanent damage; reliable operation requires staying within recommended conditions.

Is TPS3619-33DGKRG4 pin-compatible with industry-standard alternatives?

Yes, the TPS3619-33DGKRG4 is pin-for-pin compatible with MAX819, MAX703, and MAX704 in the same MSOP-8 (DGK) package. Pin mapping matches exactly: VOUT–1, VDD–2, GND–3, PFI–4, PFO–5, MR–6, RESET–7, VBAT–8. This allows direct replacement in existing layouts without PCB changes, provided timing and leakage requirements align with the TPS3619-33DGKRG4's 100 nA VBAT current and 100-ms reset delay.