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MAX1908 Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX1908
Description  Low-Cost Multichemistry Battery Chargers
PDF  27 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1908 Datasheet(HTML) 8 Page - Maxim Integrated Products

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Low-Cost Multichemistry Battery Chargers
8
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VREFIN = 3V, VVCTL = VICTL = 0.75 x VREFIN, CELLS = FLOAT, CLS =
REF, VBST - VLX = 4.5V, ACIN = GND = PGND = 0, CLDO = 1µF, LDO = DLOV, CREF = 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CELLS Input Float Voltage
CELLS = float
(VREFIN
/ 2) -
0.2V
(VREFIN
/ 2) +
0.2V
V
CELLS Input High Voltage
VREFIN
- 0.4V
V
ACOK AND SHDN
ACOK Input Voltage Range
0
28
V
ACOK Sink Current
VACOK = 0.4V, VACIN = 3V
1
mA
SHDN Input Voltage Range
0
LDO
V
SHDN Threshold
VSHDN falling
22
25
% of
VREFIN
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.
LOAD-TRANSIENT RESPONSE
(BATTERY INSERTION AND REMOVAL)
MAX1908 toc01
1ms/div
IBATT
2A/div
VBATT
5V/div
VCCI 500mV/div
VCCV 500mV/div
ICTL = LDO
VCTL = LDO
CCV
CCI
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc02
1ms/div
V_BATT
2V/div
V_CCI
500mV/div
V_CCS
500mV/div
16.8V
0
0
LOAD
CURRENT
5A/div
ADAPTER
CURRENT
5A/div
ICTL = LDO
CHARGING CURRENT = 3A
V_BATT = 16.8V
LOAD STEP = 0 TO 4A
I_SOURCE LIMIT = 5A
CCI
CCS
CCI
CCS
V_BATT
2V/div
0
0
0
CHARGE
CURRENT
2A/div
LOAD
CURRENT
5A/div
ADAPTER
CURRENT
5A/div
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc03
1ms/div
ICTL = LDO
CHARGING CURRENT = 3A
VBATT = 16.8V
LOAD STEP = 0 TO 4A
I_SOURCE LIMIT = 5A
Typical Operating Characteristics
(Circuit of Figure 1, VDCIN = 20V, TA = +25°C, unless otherwise noted.)



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