BQ24075 and BQ24075T PowerPath battery chargers connection guide

BQ24075 and BQ24075T PowerPath battery chargers RGT VQFN-16 wiring guide with power, signal assignments, and bench checks.

RGT VQFN-16

17 contacts Current package

Texas Instruments · 3 × 3 mm nominal RGT package with an exposed thermal pad.

A 4.2 V single-cell linear charger with a separate system output and battery disconnect control. This version biases a 10 kΩ negative-temperature-coefficient (NTC) thermistor directly from TS.

Bring up the power path with a battery simulator

Required

Use a 6 V current-limited bench source and a 3.6 V battery simulator that can source and sink current. Drive EN2 high from a 3.3 V logic supply. Leave TMR open for the internal timers. The fixed TS resistors simulate a valid temperature only for this test.

6 V input
- IN (13)
- CIN.1
- Current-limited 6 V bench supply
Ground
- VSS (8)
- EP (17)
- EN1 (6)
- CE (4)
- SYSOFF (15)
- CIN.2
- CBAT.2
- COUT.2
- RSET.2
- RLIM.2
- RT2.2
- Supply return
- Simulator return
- Logic supply return
- Meter common
System output
- OUT (10)
- OUT (11)
- COUT.1
- Meter positive
3.3 V logic supply
- Logic supply positive
- EN2 (5)
Simulated battery positive
- BAT (2)
- BAT (3)
- CBAT.1
- Battery simulator positive
Charge current setting
- ISET (16)
- RSET.1
Input current limit
- ILIM (12)
- RLIM.1
Simulated temperature
- TS (1)
- RT2.1

Bench checks

Verify polarity and the VSS and exposed-pad connections before applying power.
Measure OUT at approximately 5.5 V with no external system load and enough input headroom.
A typical programmed fast-charge current is 890 AΩ ÷ 2.61 kΩ ≈ 0.34 A. Compare the measured current to the operating conditions and tolerances in the data sheet.

Texas Instruments SLUS810N, Pin Functions, Electrical Characteristics and battery temperature monitoring. The fixture uses a simulated battery.

Connection scenarios

Check adapter and charging status

Keep the same simulator setup. Pull each open-drain status pin up to the existing 3.3 V logic supply through a 10 kΩ resistor.

6 V input
- IN (13)
- CIN.1
- Current-limited 6 V bench supply
Ground
- VSS (8)
- EP (17)
- EN1 (6)
- CE (4)
- SYSOFF (15)
- CIN.2
- CBAT.2
- COUT.2
- RSET.2
- RLIM.2
- RT2.2
- Supply return
- Simulator return
- Logic supply return
- Meter common
System output
- OUT (10)
- OUT (11)
- COUT.1
- Meter positive
3.3 V logic supply
- Logic supply positive
- EN2 (5)
- RPG.1
- RCHG.1
Simulated battery positive
- BAT (2)
- BAT (3)
- CBAT.1
- Battery simulator positive
Charge current setting
- ISET (16)
- RSET.1
Input current limit
- ILIM (12)
- RLIM.1
Simulated temperature
- TS (1)
- RT2.1
Power-good status
- PGOOD (7)
- RPG.2
- Logic probe
Charge status
- CHG (9)
- RCHG.2
- Logic probe

Bench checks

Verify PGOOD is low with the valid adapter input. CHG should pull low on the first active charge cycle.
For a real pack, connect the compatible 10 kΩ NTC pack thermistor to TS as shown in Figure 10-13.

Texas Instruments SLUS810N, Status Indicators and Typical Applications. Pull-up resistance is a fixture choice.

RGT VQFN-16 wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Top view, with pin 1 on the upper left. The exposed thermal pad is underneath the body.
EP is the exposed center pad on the underside.

Selected pin details

17 · EP

Thermal pad · Ground

Solder the exposed pad to the board ground. Connect the VSS lead to the same ground.

Texas Instruments SLUS810N, Pin Functions and package drawing

Electrical limits · Pin in the reference

Models and documents

BQ24075 and BQ24075T share the RGT VQFN-16 contact arrangement. Select the exact model before using the TS connection example. The initial view shows BQ24075.

BQ24075: A 4.2 V single-cell linear charger with a separate system output and battery disconnect control. This version biases a 10 kΩ negative-temperature-coefficient (NTC) thermistor directly from TS.
BQ24075RGTR: RGT package, 3000-unit tape and reel.
BQ24075RGTR.A: RGT package, 3000-unit tape and reel.
BQ24075RGTR.B: RGT package, 3000-unit tape and reel.
BQ24075RGTRG4: RGT package, 3000-unit tape and reel.
BQ24075RGTRG4.A: RGT package, 3000-unit tape and reel.
BQ24075RGTRG4.B: RGT package, 3000-unit tape and reel.
BQ24075RGTT: RGT package, 250-unit tape and reel.
BQ24075RGTT.A: RGT package, 250-unit tape and reel.
BQ24075RGTT.B: RGT package, 250-unit tape and reel.
BQ24075T: A 4.2 V single-cell linear charger with a separate system output and battery disconnect control. The T suffix uses input-ratiometric voltage thresholds at TS.
BQ24075TRGTR: RGT package, 3000-unit tape and reel.
BQ24075TRGTR.A: RGT package, 3000-unit tape and reel.
BQ24075TRGTR.B: RGT package, 3000-unit tape and reel.
BQ24075TRGTT: RGT package, 250-unit tape and reel.
BQ24075TRGTT.A: RGT package, 250-unit tape and reel.
BQ24075TRGTT.B: RGT package, 250-unit tape and reel.

Texas Instruments SLUS810N· Device pin functions, input and charge regulation, power-path behavior and temperature-sense application circuit.
Source register· Document revisions, applicable order codes, consulted sections and available file checksums.