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PDF MAX1908 Data sheet ( Hoja de datos )
| Número de pieza | MAX1908 | |
| Descripción | Low-Cost Multichemistry Battery Chargers | |
| Fabricantes | Maxim Integrated Products | |
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19-2764; Rev 5; 11/09
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Low-Cost Multichemistry Battery Chargers
General Description
The MAX1908/MAX8724/MAX8765/MAX8765A highly
integrated, multichemistry battery-charger control ICs
simplify the construction of accurate and efficient charg-
ers. These devices use analog inputs to control charge
current and voltage, and can be programmed by the host
or hardwired. The MAX1908/MAX8724/MAX8765/
MAX8765A achieve high efficiency using a buck topology
with synchronous rectification.
The MAX1908/MAX8724/MAX8765/MAX8765A feature
input current limiting. This feature reduces battery
charge current when the input current limit is reached
to avoid overloading the AC adapter when supplying
the load and the battery charger simultaneously. The
MAX1908/MAX8724/MAX8765/MAX8765A provide out-
puts to monitor current drawn from the AC adapter (DC
input source), battery-charging current, and the pres-
ence of an AC adapter. The MAX1908’s conditioning
charge feature provides 300mA to safely charge deeply
discharged lithium-ion (Li+) battery packs.
The MAX1908 includes a conditioning charge feature
while the MAX8724/MAX8765/MAX8765A do not.
The MAX1908/MAX8724/MAX8765/MAX8765A charge two
to four series Li+ cells, providing more than 5A, and are
available in a space-saving, 28-pin, thin QFN package (5mm
× 5mm). An evaluation kit is available to speed designs.
Applications
Notebook and Subnotebook Computers
Personal Digital Assistants
Handheld Terminals
Minimum Operating Circuit
AC ADAPTER
INPUT
0.01Ω
TO EXTERNAL
LOAD
LDO
FROM HOST µP
CSSP
DCIN
REFIN
CSSN
CELLS
LDO
VCTL BST
ICTL DLOV
ACIN
MAX1908
ACOK MAX8724
MAX8765
SHDN MAX8765A
DHI
LX
ICHG DLO
IINP PGND
CCV CSIP
CCI
CCS
REF CLS
CSIN
BATT
GND
10µH
0.015Ω
BATT+
Features
o ±0.5% Output Voltage Accuracy Using Internal
Reference (±0.4% for MAX8765A, 2-/3-Cell Only)
o ±4% Accurate Input Current Limiting
o ±5% Accurate Charge Current
o Analog Inputs Control Charge Current and
Charge Voltage
o Outputs for Monitoring
Current Drawn from AC Adapter
Charging Current
AC Adapter Presence
o Up to 17.6V Battery-Voltage Set Point
o Maximum 28V Input Voltage
o > 95% Efficiency
o Shutdown Control Input
o Charge Any Battery Chemistry
Li+, NiCd, NiMH, Lead Acid, etc.
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1908ETI+
-40°C to +85°C 28 Thin QFN-EP*
MAX8724ETI+
-40°C to +85°C 28 Thin QFN-EP*
MAX8765ETI+
-40°C to +85°C 28 Thin QFN-EP*
MAX8765AETI+
-40°C to +85°C 28 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
DLOV 22
LX 23
BST 24
DHI 25
CSSN 26
CSSP 27
IINP 28
+
21 20 19 18 17 16 15
MAX1908
MAX8724
MAX8765
MAX8765A
1 23 4 567
14 GND
13 ICTL
12 REFIN
11 ACOK
10 ACIN
9 ICHG
8 SHDN
THIN QFN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
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 = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
TRIP POINTS
BATT Power-Fail Threshold
SYMBOL
CONDITIONS
VDCIN falling, referred to VCSIN
(MAX1908/MAX8724 only)
VCSSP falling, referred to VCSIN
(MAX8765/MAX8765A only)
MIN TYP MAX UNITS
50 100 150
mV
50 100 150
BATT Power-Fail Threshold
Hysteresis
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
SWITCHING REGULATOR
DHI Off-Time
DHI Minimum Off-Time
DHI Maximum On-Time
DLOV Supply Current
BST Supply Current
BST Input Quiescent Current
LX Input Bias Current
LX Input Quiescent Current
DHI Maximum Duty Cycle
Minimum Discontinuous-Mode
Ripple Current
ACIN rising (MAX8765/MAX8765A only)
ACIN rising (MAX1908/MAX8724 only)
0.5% of REF
VACIN = 2.048V
VBATT = 16V, VDCIN = 19V,
VCELLS = VREFIN
VBATT = 16V, VDCIN = 17V,
VCELLS = VREFIN
DLO low
DHI high
VDCIN = 0V, VBST = 24.5V,
VBATT = VLX = 20V
VDCIN = 28V, VBATT = VLX = 20V
VDCIN = 0V, VBATT = VLX = 20V
200
2.028
2.007
-1
2.048
2.048
20
2.068
2.089
+1
mV
V
mV
µA
0.36 0.4 0.44
0.24 0.28 0.33
2.5 5 7.5
5 10
6 15
0.3 1
150 500
0.3 1
99 99.9
0.5
µs
µs
ms
µA
µA
µA
µA
µA
%
A
Battery Undervoltage Charge
Current
Battery Undervoltage Current
Threshold
DHI On-Resistance High
DHI On-Resistance Low
DLO On-Resistance High
DLO On-Resistance Low
VBATT = 3V per cell (RS2 = 15mΩ),
MAX1908 only, VBATT rising
CELLS = GND, MAX1908 only, VBATT rising
CELLS = open, MAX1908 only, VBATT rising
CELLS = VREFIN, MAX1908 only, VBATT rising
VBST - VLX = 4.5V, IDHI = +100mA
VBST - VLX = 4.5V, IDHI = -100mA
VDLOV = 4.5V, IDLO = +100mA
VDLOV = 4.5V, IDLO = -100mA
150
6.1
9.15
12.2
300
6.2
9.3
12.4
4
1
4
1
450
6.3
9.45
12.6
7
3.5
7
3.5
mA
V
Ω
Ω
Ω
Ω
_______________________________________________________________________________________ 5
5 Page 
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Low-Cost Multichemistry Battery Chargers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VDCIN = 20V, TA = +25°C, unless otherwise noted.)
VDCIN
10V/div
VBATT
500mV/div
LINE-TRANSIENT RESPONSE
MAX1908 toc04
INDUCTOR
CURRENT
500mA/div
ICTL = LDO
10ms/div
VCTL = LDO
ICHARGE = 3A
LINE STEP 18.5V TO 27.5V
REF VOLTAGE LOAD REGULATION
0
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
-0.10
0
100 200 300 400
REF CURRENT (µA)
500
LDO LOAD REGULATION
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
VLDO = 5.4V
-0.9
-1.0
012345678
LDO CURRENT (mA)
9 10
REF VOLTAGE ERROR vs. TEMPERATURE
0.10
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
-40
-15 10 35 60
TEMPERATURE (°C)
85
LDO LINE REGULATION
0.05
0.04 ILDO = 0
0.03 VLDO = 5.4V
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.05
8 10 12 14 16 18 20 22 24 26 28
VIN (V)
EFFICIENCY vs. CHARGE CURRENT
100
90
80
70 VBATT = 16V
60 VBATT = 12V
50
40 VBATT = 8V
30
20
10
0
0.01
0.1 1
CHARGE CURRENT (A)
10
FREQUENCY vs. VIN - VBATT
500
450
400 3 CELLS
350 4 CELLS
300
250
200
150
100
ICHARGE = 3A
VCTL = ICTL = LDO
50
0
0 2 4 6 8 10 12 14 16 18 20 22
(VIN - VBATT) (V)
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
OUTPUT V/I CHARACTERISTICS
2 CELLS
3 CELLS
4 CELLS
123
BATT CURRENT (A)
4
BATT VOLTAGE ERROR vs. VCTL
0.08
0.07
0.06
0.05
0.04
0.03
0.02 4 CELLS
0.01
REFIN = 3.3V
NO LOAD
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
VCTL/REFIN (%)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1908.PDF ] | |
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