SLVAEG1A August 2019 – May 2021 TLV62568 , TLV62568A , TPS62840

5 Testing Results

PARAMETER	ARCHITECTURE A	ARCHITECTURE B	ARCHITECTURE C
I_Q (Load = 0 A, Device Enabled)	34 µA	2.7 mA	75 nA
Light Load (I_LOAD = 10 µA)
System Efficiency	10%	0.1%	93%
Stage 1 Ripple	22.4 mV	6.0 mV	5.20 mV
	1.87% Accuracy	0.50% Accuracy	0.43% Accuracy
	Architecture A at 10 µA load. Both pre- and post-LDO ripples shown in dark blue and light blue, respectively. LDO rejects > 50 dB at 20 Hz PFM frequency	Architecture B at 10 µA load. Ripple (dark blue) and FFT plot of ripple (red) showing expected PWM ripple at 1.5 MHz	Architecture C at 10 µA load. Both pre-and post-PI filter ripples shown in dark blue and light blue, respectively. PI filter rejects only 3 dB at 100 Hz PFM frequency
Stage 2 Ripple	Noise Floor	N/A	3.60mV
Stage 2 Ripple	<0.01% Accuracy	N/A	0.30% Accuracy
Full Load (I_LOAD = 200 mA)
System Efficiency	61%	91%	88%
Stage 1 Ripple	28.0 mV	6.0 mV	3.68 mV
	2.33% Accuracy	0.50% Accuracy	0.31% Accuracy
	FFT plot for ripple before LDO with 6.5 MHz bandwidth; cursors at low frequency 200 kHz peak and nominal switching frequency 1.5 MHz peak	FFT plot shown for FPWM ripple with 6.25 MHz bandwidth; cursors at nominal switching frequency 1.5 MHz and first harmonic 3 MHz peaks	FFT plot for ripple before PI filter with 6.25 MHz bandwidth; cursors at nominal switching frequency 1.8 MHz and first harmonic 3.6 MHz peaks
Stage 2 Ripple	7.6 mV	N/A	Noise Floor
	0.63% Accuracy		<0.01% Accuracy
	FFT plot for ripple after LDO with 6.5 MHz bandwidth; cursors in same spots showing expected 22 dB rejection by TPS7A05 at 1.5 MHz		FFT plot for ripple after PI filter with 6.25 MHz bandwidth; cursors in same spots showing ripple after PI filter reaches noise floor of oscilloscope (85–90 dB)
Thermal Images Taken after 20 minutes on with 200 mA load current	Infrared image showing TLV62568 heating to 28.8°C and TPS7A05 heating to 50.6°C after 20 minutes	Infrared image showing TLV62568A heating to 22.5°C after 20 minutes	Infrared image showing TPS62841 heating to 23.3°C after 20 minutes
Transient - Switching Load (Square wave, 50uA-200mA, 1kHz)
Stage 1 Ripple	Dynamically changing operation mode (PFM-PWM-PFM) with load change. FFT plot before LDO with 4 MHz bandwidth, showing several frequency spikes as PFM frequency changes to PWM	Output ripple continues to be PWM as load changes, with minimal overshoot and undershoot at load step. FFT plot with 2.5 MHz bandwidth shows ripple at 1.5 MHz, as expected	Dynamically changing operation mode (PFM-PWM) with load change. FFT plot before PI filter with 4.25 MHz bandwidth, showing ripple primarily at very low frequencies (PFM) and switching frequency (1.8 MHz)
Stage 2 Ripple	FFT plot after LDO with 4 MHz bandwidth shows higher overshoot and undershoot values (low frequency) and strong noise attenuation by LDO	N/A	FFT plot after PI filter with 4.25 MHz bandwidth, showing undershoot and overshoot present, though smaller than values in Architecture A, and very strong noise attenuation by PI filter
Overshoot (at output of architecture)	24 mV	3 mV	6 mV
Overshoot Settling Time	125 µs	60 µs	166 µs
Undershoot (at output of architecture)	76 mV	3 mV	8 mV
Undershoot Settling Time	129 µs	29 µs	96 µs