
BATTERY TERMINATION VOLTAGE
vs. TEMPERATURE
MAX1874 toc09
TEMPERATURE (°C)
V
BATT
(V)
655020 35-10 5-25
4.16
4.17
4.18
4.19
4.20
4.21
4.22
4.23
4.24
4.25
4.15
-40 80
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
6 _______________________________________________________________________________________
Typical Operating Characteristics
(V
USB
= V
DC
= V
DCLV
= V
EN
= 5V, V
BATT
= 4.2V, V
THRM
= V
REF
/ 2, V
DCI
= V
REF
, V
USEL
= 5V, Circuit of Figure 4, T
A
= +25°C,
unless otherwise noted.)
DC INPUT CURRENT
vs. DC INPUT VOLTAGE
MAX1874 toc01
V
DC
(V)
I
DC
(mA)
18161412108642
2
4
6
8
10
12
14
0
020
V
USB
= 0
V
BATT
= 4.2V
V
EN
= 5V
INCLUDES R2 CURRENT
USB INPUT CURRENT
vs. USB INPUT VOLTAGE
MAx1874 toc02
V
USB
(V)
I
USB
(mA)
653421
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
07
V
EN
= 5V, V
DC
FLOATING
INCLUDES R3 AND R4 CURRENTS
USB INPUT CURRENT
vs. USB INPUT VOLTAGE (V
EN
= 0)
MAx1874 toc03
V
USB
(V)
USB
(mA)
653421
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
07
V
EN
= 0
INCLUDES R3 AND R4 CURRENTS
CHARGE CURRENT
vs. DC INPUT-VOLTAGE HEADROOM
MAX1874 toc04
(V
DC
-
V
BATT
) (V)
I
BATT
(mA)
1.81.60.2 0.4 0.6 1.0 1.20.8 1.4
100
200
300
400
500
600
700
800
0
02.0
DCI SET FOR I
BATT
= 750mA
CHARGE CURRENT
vs. USB VOLTAGE HEADROOM
MAX1874 toc05
(V
USB
- V
BATT
) (V)
I
BATT
(mA)
1.81.60.2 0.4 0.6 1.0 1.20.8 1.4
100
200
300
400
500
600
0
02.0
CHARGE CURRENT vs. BATTERY VOLTAGE
(I
BATT
vs. V
BATT
)
MAX1874 toc06
V
BATT
(V)
I
BATT
(mA)
4.54.03.0 3.51.0 1.5 2.0 2.50.5
100
200
300
400
500
600
700
800
900
1000
0
0 5.0
V
EN
= 5
V
USB
= 0
I
BATT
= SET TO 750mA
V
DC
= V
DCLV
= 5V
CHARGE CURRENT vs. TEMPERATURE
WITH THERMAL REGULATION
MAX1874 toc07
TEMPERATURE (°C)
I
BATT
(A)
0.2
0.4
0.6
0.8
1.0
1.2
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
V
DCI
= V
REF
V
DC
= 5V
V
BATT
= 3.9V
CHARGE CURRENT vs. V
DCI
MAx1874 toc08
V
DCI
(V)
I
BATT
(A)
1.2
0
1.0
0.8
0.6
0.4
0.2
0 0.5 1.0 1.5 2.0 2.5 3.0
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