Rainbow Electronics MAX1874 - Manual (Page 6)

BATTERY TERMINATION VOLTAGE
vs. TEMPERATURE
MAX1874 toc09
TEMPERATURE ( °C)
V
BATT
(V)
65 50 20 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)
18 16 14 12 10 8 6 4 2
2
4
6
8
10
12
14
0
0 20
V USB = 0
VBATT = 4.2V
VEN = 5V
INCLUDES R2 CURRENT
USB INPUT CURRENT
vs. USB INPUT VOLTAGE
MAx1874 toc02
V USB (V)
I USB
(mA)
6 5 3 4 2 1
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
0 7
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)
6 5 3 4 2 1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
0 7
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)
1.8 1.6 0.2 0.4 0.6 1.0 1.2 0.8 1.4
100
200
300
400
500
600
700
800
0
0 2.0
DCI SET FOR I BATT = 750mA
CHARGE CURRENT
vs. USB VOLTAGE HEADROOM
MAX1874 toc05
(V USB - V BATT ) (V)
I BATT
(mA)
1.8 1.6 0.2 0.4 0.6 1.0 1.2 0.8 1.4
100
200
300
400
500
600
0
0 2.0
CHARGE CURRENT vs. BATTERY VOLTAGE
(I BATT vs. V BATT )
MAX1874 toc06
V BATT (V)
I BATT
(mA)
4.5 4.0 3.0 3.5 1.0 1.5 2.0 2.5 0.5
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