Texas Instruments TPS62065/67EVM Test Data, Efficiency, Start-up TPS62065, TPS62065Startup

TPS62065/67EVM Test Data www.ti.com

6TPS62065/67EVM Test Data

Figure 4 through Figure 11 present typical performance curves for the TPS62065/67EVM. Actual performance data can be affected by measurement techniques and environmental variables; therefore, these curves are presented for reference and may differ from actual results obtained by some users.

6.1Efficiency

Figure 4 shows the typical efficiency performance for the TPS62065 and TPS62067.

EFFICIENCY￿VS￿LOAD￿CURRENT

	100
	95
	90
Efficiency(%)￿	85
	80
	75
	70	VIN =￿3.0￿V
	65	VIN =￿3.3￿V					L￿=￿1.0 ∝H￿(LQH441R0)
	60	VIN =￿3.6￿V					COUT =￿10 ∝F￿(0603￿size)
	55	VIN =￿4.2￿V					VOUT =1.8￿V
		VIN =￿5.0V					Mode:￿Auto￿PFM/PWM
	50
	0	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

IOUT (A)

Figure 4. TPS62065, TPS62067 Efficiency vs Load Current

6.2Start-up: TPS62065

Figure 5 shows the typical start-up performance for the TPS62065 using the TPS62065EVM.

TPS62065￿Startup

2￿V/DIV

1￿V/DIV

2￿A/DIV

500￿MA/DIV	L￿=￿1.2 ∝H
	COUT =￿10 ∝F
	VIN =￿3.6￿V
500￿MA/DIV	VOUT =￿1.8￿V

LOAD￿=￿R2R

TIME￿(100 ∝S/DIV)

Conditions: VIN = 3.6 V, VOUT = 1.8 V

Figure 5. TPS62065 Startup into 2.2-Ω Load

8 TPS62065/67EVM SLVU364 –March 2010

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