Ad va n c e d Ch e m is t ry-In d e p e n d e n t , Le ve l 2
Ba t t e ry Ch a rg e r w it h In p u t Cu rre n t Lim it in g
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V = +3.3V, V
= +16.8V, V
= +18V, T = 0°C to +85°C, unless otherwise noted. Typical values are at
DD
BATT
DCIN
A
T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC-TO-DC CONVERTER SPECIFICATIONS
Minimum Off-Time
t
1
5
1.25
10
1.5
15
µs
ms
%
OFF
Maximum On-Time
t
ON
MAX1645
Maximum Duty Cycle
LX Input Bias Current
LX Input Quiescent Current
BST Supply Current
99
99.99
200
V
= 28V, V
= V = 20V
500
1
µA
µA
µA
µA
A
DCIN
BATT
LX
V
DCIN
= 0, V
= V = 20V
BATT LX
DHI high
= V
6
5
15
10
7.0
14
14
DLOV Supply Current
Inductor Peak Current Limit
DHI Output Resistance
DLO Output Resistance
V
DLOV
, DLO low
LDO
R
= 50mΩ
5.0
-1
6.0
6
CSI
DHI high or low, V
- V = 4.5V
LX
Ω
BST
DLO high or low, V
= 4.5V
6
Ω
DLOV
THERMISTOR COMPARATOR SPECIFICATIONS
V
= 4% of V to 96% of V
= 2.8V to 5.65V
,
THM
DD
DD
THM Input Bias Current
1
µA
V
DD
Thermistor Overrange Threshold
Thermistor Cold Threshold
Thermistor Hot Threshold
V
= 2.8V to 5.65V, V
falling
falling
falling
89.5
74
91
92.5 % of V
DD
DD
THM
V
DD
= 2.8V to 5.65V, V
75.5
23.5
77
25
% of V
DD
THM
V
DD
= 2.8V to 5.65V, V
22
% of V
DD
THM
Thermistor Underrange
Threshold
V
= 2.8V to 5.65V, V
falling
6
7.5
1
9
% of V
DD
DD
THM
Thermistor Comparator
Threshold Hysteresis
All 4 comparators, V = 2.8V to 5.65V
% of V
DD
DD
SMB INTERFACE LEVEL SPECIFICATIONS (V = 2.8V to 5.65V)
DD
SDA/SCL Input Low Voltage
SDA/SCL Input High Voltage
SDA/SCL Input Hysteresis
SDA/SCL Input Bias Current
0.6
1
V
1.4
V
220
25
mV
µA
mA
µA
mV
-1
6
SDA Output Low Sink Current
INT Output High Leakage
INT Output Low Voltage
V
= 0.4V
= 5.65V
= 1mA
SDA
V
INT
1
I
200
INT
SMB INTERFACE TIMING SPECIFICATIONS (V = 2.8V to 5.65V, Figures 4 and 5)
DD
SCL High Period
SCL Low Period
t
4
µs
µs
HIGH
t
4.7
LOW
Start Condition Setup Time
from SCL
t
4.7
4
µs
µs
SU:STA
Start Condition Hold Time
from SCL
t
t
HD:STA
SDA Setup Time from SCL
SDA Hold Time from SCL
250
0
ns
ns
SU:DAT
HD:DAT
t
4
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
