Datasheet

12 Maxim Integrated
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Typical Operating Characteristics (continued)
(MAX8934A, T
A
= +25NC, circuit of Figure 2, V
DC
= 6V, V
BATT
= 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
LDO OUTPUT VOLTAGE vs. LDO OUTPUT
CURRENT (USB DISCONNECTED)
MAX8934A/B/C toc26
LDO OUTPUT CURRENT (mA)
LDO OUTPUT VOLTAGE (V)
15012525 50 75 100
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
2.95
0 175
V
DC
= 5.0V
V
BATT
= 4.0V
DC UNCONNECTED
LDO OUTPUT VOLTAGE vs.
BATTERY VOLTAGE
MAX8934A/B/C 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
MAX8934A 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
LDO STARTUP WAVEFORMS
MAX8934A/B/C 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
MAX8934A 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
MAX8934A/B/C toc31
2V/div
500mV/div
500mA/div
I
BATT
V
BATT
V
THM
10ms/div
2.2V
3.6V
1A
500mA