Typical operating characteristics (continued) – Rainbow Electronics MAX1874 User Manual
Page 7
MAX1874
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
_______________________________________________________________________________________
7
OFF-BATTERY LEAKAGE
vs. USB INPUT VOLTAGE
MAx1874 toc10
V
USB
(V)
I
BATT OFF
(µ
A)
6
5
3
4
2
1
1
2
3
4
5
6
7
8
9
10
0
0
7
V
EN
= 0
V
DCLV
= V
DC
= 0
V
BATT
= 4.2V
OFF-BATTERY LEAKAGE
vs. DC INPUT VOLTAGE
MAx1874 toc11
V
DCIN
(V)
I
BATT OFF (
µ
A)
6
5
3
4
2
1
1
2
3
4
5
6
7
8
9
10
0
0
7
V
EN
= 0
V
USB
= 0
V
BATT
= 4.2V
V
DC
= V
DCLV
USB LEAKAGE vs. DC INPUT VOLTAGE
MAX1874 toc12
V
DCIN
(V)
I
USB OFF (nA)
16
14
12
10
8
6
4
2
100
200
300
400
500
600
0
0
18
LEAKAGE FROM USB TO GND
V
EN
= 5V
BATTERY CURRENT AND VOLTAGE
vs. TIME
MAX1874 toc13
TIME (MIN)
I
BATT
(A)
200
150
50
100
100
200
300
400
500
600
700
800
900
1000
0
0.8
1.6
2.4
3.2
4.0
4.8
5.6
6.4
7.2
8.0
0
0
300
250
1.5AHr CELL
V
BATT
AND V
CHG
(V)
I
BATT
CHG
V
BATT
RESPONSE TO OVERVOLTAGE INPUT
USB = 0
MAX1874 toc14
40ms/div
20V/div
DC
DCLV
PON
5V/div
5V/div
20V/div
DCOK
DC CONNECT WAVEFORMS
V
USB
= 0, V
BATT
= 3.9V
MAX1874 toc15
40ms/div
10V/div
DC
DCLV
PON
10V/div
10V/div
1A/div
10V/div
DCOK
I
BATT
Typical Operating Characteristics (continued)
(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 CONNECT WAVEFORMS
V
USB
= 5V, V
BATT
= 3.9V
MAX1874 toc16
40ms/div
10V/div
DC
DCLV
PON
10V/div
10V/div
1A/div
10V/div
DCOK
I
BATT
USB CONNECT WAVEFORMS
V
DC
= 0, V
BATT
= 3.9V
MAX1874 toc17
40ms/div
5V/div
USB
PON
5V/div
500mA/div
5V/div
UOK
I
BATT
DC STARTUP WAVEFORMS FOR ENABLE
V
BATT
= 3.9V
MAX1874 toc18
10ms/div
5V/div
EN
5V/div
500mA/div
CHG
I
BATT