MAX1908 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1908 Datasheet PDF : 30 Pages
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MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VREFIN = 3V, VVCTL = VICTL = 0.75 x VREFIN, CELLS = open, 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
ERROR AMPLIFIERS
SYMBOL
CONDITIONS
GMV Amplifier Transconductance
GMI Amplifier Transconductance
GMS Amplifier Transconductance
CCI, CCS, CCV Clamp Voltage
LOGIC LEVELS
GMV
GMI
GMS
VVCTL = VLDO, VBATT = 16.8V,
CELLS = VREFIN
VICTL = VREFIN, VCSIP - VCSIN = 75mV
VCLS = VREF, VCSSP - VCSSN = 75mV
0.25V < VCCV,CCS,CCI < 2V
CELLS Input Low Voltage
CELLS Input Open Voltage
CELLS = open
MIN TYP MAX UNITS
0.0625
0.5
0.5
150
(VREFIN
/2) -
0.2V
0.250 µA/mV
2.0 µA/mV
2.0 µA/mV
600
mV
0.4
V
(VREFIN
/2) +
V
0.2V
CELLS Input High Voltage
ACOK AND SHDN
ACOK Input Voltage Range
ACOK Sink Current
SHDN Input Voltage Range
SHDN Threshold
V ACOK = 0.4V, VACIN = 3V
V SHDN falling
VREFIN
- 0.4V
0
1
0
22
V
28
LDO
25
V
mA
V
% 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 TA = -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, VDCIN = 20V, TA = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
(BATTERY INSERTION AND REMOVAL)
MAX1908 toc01
IBATT
2A/div
VBATT
5V/div
VCCI
500mV/div
VCCV
500mV/div
CCV
CCI
ADAPTER
CURRENT
5A/div
LOAD
CURRENT
5A/div
VBATT
2V/div
VCCI
500mV/div
VCCS
500mV/div
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc02
LOAD
CURRENT
0
5A/div
ADAPTER
0 CURRENT
5A/div
16.8V
CHARGE
CCS
CURRENT
2A/div
CCI
CCI
CCS
VBATT
2V/div
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc03
0
0
0
ICTL = LDO
VCTL = LDO
1ms/div
ICTL = LDO
1ms/div
CHARGING CURRENT = 3A
VBATT = 16.8V
LOAD STEP = 0 TO 4A
ISOURCE LIMIT = 5A
ICTL = LDO
1ms/div
CHARGING CURRENT = 3A
VBATT = 16.8V
LOAD STEP = 0 TO 4A
ISOURCE LIMIT = 5A
10
Maxim Integrated
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