Fujitsu MB3891 manual Efficiency vs. power supply voltage Vsimout Chargepump, Voltage Vsimout

MB3891

Efficiency η (%)

Efficiency vs. power supply voltage

	(VSIMOUT Chargepump)
100
		Ta = +25 °C
90
		VSIM-ON = “H”
80
		SIMPROG = “L”
70
60
50

40ILOAD = −10 mA

20ILOAD = −1 mA

0			4.5	5.0	5.5
3.0	3.5	4.0

Efficiency vs. power supply voltage (VSIMOUT Chargepump)

	100				Ta = +25 °C
	90
					VSIM-ON = “H”
(%)	80				SIMPROG = “H”
	70		ILOAD = −10 mA
η	60
Efficiency
	50
	40	ILOAD = −1 mA
	30
	20
	10
	0			4.5	5.0	5.5
	3.0	3.5	4.0

Power supply voltage VCC-VSIM(V)	Power supply voltage VCC-VSIM(V)
Efficiency vs. load current	Efficiency vs. load current
(VSIMOUT Chargepump)	(VSIMOUT Chargepump)

	100		Ta = +25 °C				100
	90						90
			VBAT = VCC-VSIM = 3.6 V					VCC-VSIM = 3.1 V
	80						80
(%)			VSIM-ON = “H”			(%)
	70		SIMPROG = “L”				70
η	60	VCC-VSIM = 5.5 V				η	60	VCC-VSIM = 3.6 V
Efficiency						Efficiency
	50	VCC-VSIM = 3.1 V					50		VCC-VSIM = 5.5 V
	40						40
			VCC-VSIM = 3.6 V
	30						30		Ta = +25 °C
	20						20		VBAT = VCC-VSIM = 3.6 V
	10						10		VSIM-ON = “H”
									SIMPROG = “H”
	0						0
		−5	−10	−15	−20			−5	−10	−15	−20
	0						0

Load current ILOAD (mA) Load current ILOAD (mA)

		Output voltage rising waveforms												Input voltage VSIM-ON(V)
Input voltage VSIM-ON(V)			(VSIMOUT Chargepump)
	10														10
	5						VSIM-ON						voltage VSIMOUT (V)		5
	0						VSIMOUT					5			0
												4
												3
												2
					Ta = +25 °C							1
					VBAT = VCC-VSIM = 3.6 V								Output
					SIMPROG = “H”							0
					VSIMOUT = 510 Ω
	0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0

t (ms)

Output voltage rising waveforms (VSIMOUT Chargepump)

						VSIM-ON
												(V)
						VSIMOUT					3	VSIMOUT
												voltage
											2
				Ta = +25 °C							1
				VBAT = VCC-VSIM = 3.6 V								Output
				SIMPROG = “L”							0
				VSIMOUT = 510 Ω
0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0

t (ms)

(Continued)

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