Datasheet

10
Maxim Integrated
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Typical Operating Characteristics (continued)
(T
A
= +25NC, circuit of Figure 2, V
DC
= 6V, V
BATT
= 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current
indicates charging.)
LDO STARTUP WAVEFORMS
MAX8934G toc27
2V/div
50mA/div
2V/div
I
BATT
V
LDO
V
BATT
400Fs/div
3.6V
I
LDO
= 0
3.3V
ALWAYS-ON LDO POWER-SUPPLY
REJECTION RATIO vs. FREQUENCY
MAX8934G toc29
FREQUENCY (kHz)
PSRR (dB)
101
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
-50
0.1 100
V
SYS
= 3.6V
I
LDO
= 10mA
RESISTIVE LOAD
THM NORMAL TO
THM COLD (< T2) TRANSITION
MAX8934G toc31
1V/div
200mV/div
200mA/div
V
THM
V
BAT
I
BAT
10ms/div
10I RESISTOR FROM BATT TO GND
4.2V
4.075V
2.2V
420mA
LDO OUTPUT VOLTAGE vs.
BATTERY VOLTAGE
MAX8934G toc28
BATTERY VOLTAGE (V)
LDO OUTPUT VOLTAGE (V)
3.53.02.52.01.51.00.5
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0 4.0
V
BATT
RISING
V
BATT
FALLING
LDO NOISE DENSITY
vs. FREQUENCY
MAX8934G toc30
FREQUENCY (kHz)
OUTPUT NOISE (nV
/
Hz)
10001001010.1
100
200
300
400
500
600
700
800
900
0
0.01 10,000
V
BATT
= 3.8V,
I
LDO
= 10mA
RESISTIVE LOAD