Fujitsu MB3891 manual Ripple rejection vs. frequency LDO1 DBm, Frequency f Hz, Output

MB3891

		Ripple rejection vs. frequency (LDO1)
(dBm)	0
	−20
R.R	−40
rejection
						OUT1 = 1 ∝F
	−60					Ta = +25 °C
						VBAT = 3.6 V
Ripple	−80					OUT1 = 18 Ω
						CONT1 = “L”
	−100					CONT6 = OPEN
	10		100	1 k	10 k		100 k	1 M

Frequency f (Hz)

Dropout voltage vs. load current (LDO1)

	0.6
(V)		VBAT = 2.1 V
	0.5	CONT1 = OPEN		Ta =	+85 °C
VDO		CONT6 = “H”
	0.4
voltage
	0.3			Ta	= −20 °C
Dropout	0.2
	0.1			Ta =	+25 °C
	0.0
		−50	−100	−150		−200
	0

Ripple rejection vs. frequency (LDO1)

(dBm)	0
	−20	OUT1 = 1 ∝F
		Ta = +25 °C
		VBAT = 3.6 V
R.R		CONT1 = “L”
	−40	CONT6 = OPEN
rejection	−60
Ripple	−80
	−100
	10	100	1 k	10 k	100 k	1 M

Frequency f (Hz)

Output voltage vs. ambient temperature (LDO1)

	2.13
(V)					VBAT = 3.6 V
	2.12				CONT1 = OPEN
VOUT1					CONT6 = “H”
	2.11
voltage
	2.10
Output
	2.09
	2.08−
		40 −20 0	20	40 60		80 100

Load current ILOAD (mA) Ambient temperature Ta ( °C)

VBAT	Output voltage rising waveforms (LDO1)
voltage	10
	5						VBAT
Power supply	0												voltage VOUT1 (V)
							OUT1					2.0
												1.5
												1.0
							Ta = +25°C					0.5
							OUT1 = 18 Ω
													Output
							CONT1 = “L”					0.0
							CONT6 = OPEN
	0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0

t (ms)

14