Rainbow-electronics MAX1874 User Manual download pdf (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

USB

(V)

BATT OFF (

653 421

= 0

DCLV

= V

= 0

BATT

= 4.2V

OFF-BATTERY LEAKAGE

vs. DC INPUT VOLTAGE

MAx1874 toc11

DCIN

(V)

BATT OFF (µA)

653 421

= 0

USB

= 0

BATT

= 4.2V

= V

DCLV

USB LEAKAGE vs. DC INPUT VOLTAGE

MAX1874 toc12

DCIN

(V)

USB OFF (nA)

161412108642

100

200

300

400

500

600

018

LEAKAGE FROM USB TO GND

= 5V

BATTERY CURRENT AND VOLTAGE

vs. TIME

MAX1874 toc13

TIME (MIN)

BATT

(A)

20015050 100

100

200

300

400

500

600

700

800

900

1000

0.8

1.6

2.4

3.2

4.0

4.8

5.6

6.4

7.2

8.0

0 300250

1.5AHr CELL

BATT

AND V

CHG

(V)

BATT

CHG

BATT

RESPONSE TO OVERVOLTAGE INPUT

USB = 0

MAX1874 toc14

40ms/div

20V/div DC

DCLV

PON

5V/div

20V/div

DCOK

DC CONNECT WAVEFORMS

USB

= 0, V

BATT

= 3.9V

MAX1874 toc15

40ms/div

10V/div

DCLV

PON

10V/div

1A/div

10V/div

DCOK

BATT

Typical Operating Characteristics (continued)

USB

= V

DCLV

= V

= 5V, V

BATT

= 4.2V, V

THRM

= V

REF

/ 2, V

DCI

= V

REF

, V

USEL

= 5V, Circuit of Figure 4, T

= +25°C,

unless otherwise noted.)

DC CONNECT WAVEFORMS

USB

= 5V, V

BATT

= 3.9V

MAX1874 toc16

40ms/div

10V/div

DCLV

PON

10V/div

1A/div

10V/div

DCOK

BATT

USB CONNECT WAVEFORMS

= 0, V

BATT

= 3.9V

MAX1874 toc17

40ms/div

5V/div

USB

PON

5V/div

500mA/div

5V/div

UOK

BATT

DC STARTUP WAVEFORMS FOR ENABLE

BATT

= 3.9V

MAX1874 toc18

10ms/div

5V/div

500mA/div

CHG

BATT

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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Rainbow-electronics MAX1874 User Manual Page 7

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