Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
BST
= V
= 18V, V
= V
= V
= 12V, V
= 3V, V
= V
= 0.75 x V
, CELLS = FLOAT, CLS =
REFIN
CSSP
CSSN
BATT
CSIP
CSIN
REFIN
VCTL
ICTL
REF, V
- V = 4.5V, ACIN = GND = PGND = 0, C
= 1µF, LDO = DLOV, C
= 1µF; CCI, CCS, and CCV are compensated
LX
LDO
REF
per Figure 1a; T = -40°C to +85°C, unless otherwise noted.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
(V
/ 2) -
0.2V
TYP
MAX
UNITS
(V
REFIN
/ 2) +
0.2V
REFIN
CELLS Input Float Voltage
CELLS = float
V
V
REFIN
CELLS Input High Voltage
V
- 0.4V
ACOK AND SHDN
ACOK Input Voltage Range
ACOK Sink Current
0
1
0
28
V
mA
V
V
V
= 0.4V, V
falling
= 3V
ACIN
A COK
S HDN
SHDN Input Voltage Range
LDO
25
% of
REFIN
SHDN Threshold
22
V
Note 1: If both ICTL and VCTL use default mode (connected to LDO), REFIN is not used and can be connected to LDO.
Note 2: Specifications to -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, V
= 20V, T = +25°C, unless otherwise noted.)
A
DCIN
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
LOAD-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
(BATTERY INSERTION AND REMOVAL)
MAX1908 toc01
MAX1908 toc03
MAX1908 toc02
ADAPTER
CURRENT
5A/div
LOAD
CURRENT
5A/div
I
BATT
2A/div
LOAD
CURRENT
5A/div
0
0
0
0
ADAPTER
CURRENT
5A/div
0
V
BATT
5V/div
V_BATT
2V/div
16.8V
CCV
CCI
CHARGE
CURRENT
2A/div
CCI
V_CCI
500mV/div
CCI
V
CCS
CCI 500mV/div
V_CCS
500mV/div
V
CCV 500mV/div
V_BATT
2V/div
CCS
1ms/div
1ms/div
1ms/div
ICTL = LDO
ICTL = LDO
ICTL = LDO
CHARGING CURRENT = 3A
V_BATT = 16.8V
CHARGING CURRENT = 3A
VBATT = 16.8V
VCTL = LDO
LOAD STEP = 0 TO 4A
I_SOURCE LIMIT = 5A
LOAD STEP = 0 TO 4A
I_SOURCE LIMIT = 5A
8
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
