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PDF MAX1535A Data sheet ( Hoja de datos )

Número de pieza MAX1535A
Descripción Highly Integrated Level 2 Smbus Battery Charger
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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19-2848; Rev 1; 11/03
EVAALVUAAILTAIOBNLEKIT
Highly Integrated Level 2 SMBus
Battery Charger
General Description
The MAX1535A is a highly integrated, multichemistry
battery charger that simplifies construction of advanced
smart chargers with a minimum number of external com-
ponents. It uses Intel’s system management bus
(SMBus™) to control the charge voltage, charge current,
and the maximum current drawn from the AC adapter.
High efficiency is achieved through use of a constant off-
www.DataSheett4imUe.cosmtep-down topology with synchronous rectification.
In addition to support of the Smart Battery Charger
Specifications Rev 1.1, the MAX1535A includes addi-
tional features. The maximum current drawn from the
AC adapter is programmable to avoid overloads when
supplying the load and the battery charger simultane-
ously. This enables the user to reduce the cost of the
AC adapter. The MAX1535A provides a digital output
that indicates the presence of an AC adapter. Based on
the presence or absence of the AC adapter, the
MAX1535A automatically selects the appropriate
source for supplying power to the system by controlling
two external P-channel MOSFETs. Under system con-
trol, the MAX1535A allows the battery to undergo a
relearning or conditioning cycle in which the battery is
completely discharged through the system load and
then recharged.
The MAX1535A is capable of charging 2, 3, or 4 lithium-
ion (Li+) cells in series, providing charge currents as
high as 8A. The DC-to-DC converter in the MAX1535A
uses a high-side P-channel switch with an N-channel
synchronous rectifier. The charge current and input cur-
rent-limit sense amplifiers have low input-offset errors
and can use small-value sense resistors (0.01Ω, typ).
The MAX1535A is available in a 5mm x 5mm 32-pin thin
QFN package and operates over the extended -40°C to
+85°C temperature range. An evaluation kit is available
to reduce design time.
Applications
Notebook and Subnotebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
Features
Compliant with Level 2 Smart Battery Charger
Specifications Rev 1.1
Intel SMBus 2-Wire Serial Interface
±0.5% Charge-Voltage Accuracy
11-Bit Charge-Voltage Resolution
±3% Input Current-Limit Accuracy
Uses Small (10mΩ) Current-Sense Resistors
8A Maximum Charge Current
6-Bit Input and Charge-Current Resolution
8V to 28V Input Voltage Range
175s Charge Safety Timer
Automatic Selection of System Power Source
Charges any Battery Chemistry (Li+, NiCd, NiMH,
Lead Acid, etc.)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1535AETJ -40°C to +85°C 32 Thin QFN (5mm x 5mm)
TOP VIEW
Pin Configuration
32 31 30 29 28 27 26 25
DCIN 1
LDO 2
ACIN 3
REF 4
GND 5
CCS 6
CCI 7
CCV 8
MAX1535A
24 DLOV
23 DLO
22 PGND
21 CSIP
20 CSIN
19 BATT
18 GND
17 I.C.
9 10 11 12 13 14 15 16
SMBus is a trademark of Intel Corp.
THIN QFN (5mm x 5mm)
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1 page




MAX1535A pdf
Highly Integrated Level 2 SMBus
Battery Charger
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VDD = 3.3V, ACIN = PGND = GND, LDO = DLOV,
VMAX = IMAX = REF, CLDO = 1µF, CDHIV = 0.1µF, CREF = 1µF, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless other-
wise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
PDL-to-PDS Switchover Time in
Relearn Mode
PDS and PDL are unloaded
www.DataSheet4MUA.cXoImMUM CHARGE-VOLTAGE SETTING
VBATT to VVMAX Ratio
VMAX = 2V, ChargeVoltage () = 0x4B00
VMAX Input Voltage Range
VMAX Input Bias Current
0 < VVMAX < VREF
MAXIMUM CHARGE-CURRENT SETTING
ICHARGE to VIMAX Ratio
IMAX Input Voltage Range
VIMAX = 0.8V, ChargeCurrent () = 0x1F80
IMAX Input Bias Current
THERMISTOR COMPARATOR
0 < VIMAX < VREF
Thermistor Overrange Threshold VDD = 2.7V to 5.5V, THM falling
Thermistor Cold Threshold
VDD = 2.7V to 5.5V, THM falling
Thermistor Hot Threshold
VDD = 2.7V to 5.5V, THM falling
Thermistor Underrange
Threshold
VDD = 2.7V to 5.5V, THM falling
4 10 16 µs
4.95
0
5.0 5.05
VREF
1
V/V
V
µA
4.75 5 5.25 A/V
0
VREF
V
1 µA
89.5 91 92.5 % of VDD
73.5 75 76.5 % of VDD
21.5 23 24.5 % of VDD
3.5 5 6.5 % of VDD
Thermistor Comparator
Hysteresis
All four comparators, VDD = 2.7V to 5.5V
SMBus INTERFACE LEVEL SPECIFICATIONS (VDD = 2.7V TO 5.5V)
SDA/SCL Input Low Voltage
VDD = 2.7V to 5.5V
SDA/SCL Input High Voltage
VDD = 2.7V to 5.5V
SDA/SCL Input Bias Current
VDD = 2.7V to 5.5V
SDA, INT Output Sink Current
VSDA = 0.4V
INT Output High Leakage Current VINT = 5.5V
INT Output Low Voltage
IINT = 1mA
SMBus TIMING SPECIFICATIONS (VDD = 2.7V TO 5.5V)
SMBus Frequency
SMBus Free Time
Start Condition Setup Time from
SCL
50 mV
0.8 V
2.1 V
-1 +1 µA
6 mA
1 µA
25 200 mV
10 100 kHz
4.7 µs
4.7 µs
Start Condition Hold Time from
SCL
4 µs
Stop Condition Setup Time from
SCL
SDA Hold Time from SCL
SDA Setup Time from SCL
SCL Low Timeout
(Note 1)
4 µs
300 ns
250 ns
25 35 ms
_______________________________________________________________________________________ 5

5 Page





MAX1535A arduino
Highly Integrated Level 2 SMBus
Battery Charger
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VDCIN = 20V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. CHARGE CURRENT
(CONSTANT-CURRENT MODE)
100
www.DataSheet4U.co90m
80
70
60
VCHARGE = 8.4V
VCHARGE = 12.6V
VCHARGE = 16.8V
50
40
0
246
CHARGE CURRENT (A)
8
CHARGE-CURRENT ACCURACY
5.0
2.5
0
FREQUENCY vs. VIN - VBATT
600
500
400
300
200
100
0
0 4 8 12 16 20
VIN - VBATT (V)
INPUT-CURRENT ACCURACY
2.5
0
-2.5
CHARGE-VOLTAGE ACCURACY
1.0
0.5
0
-0.5
-1.0
4
8 12 16
CHARGEVOLTAGE() CODE (V)
20
INPUT/CHARGE CURRENT
vs. SYSTEM LOAD CURRENT
8
CHARGECURRENT() = 4A
INPUTCURRENT() = 6A
6
INPUT CURRENT
4
-2.5
-5.0
0
-5.0 2
246
CHARGECURRENT() SETTING (A)
8
-7.5
0
2 4 6 8 10
INPUTCURRENT() SETTING (A)
12
CHARGE CURRENT
0
0246
SYSTEM LOAD CURRENT (A)
MAXIMUM CHARGE VOLTAGE vs. IMAX
10
MAXIMUM CHARGE CURRENT vs. VMAX
20
8
8 16
6 12
4
SLOPE 5V/V
2
8
SLOPE 5A/V
4
0
012345
IMAX VOLTAGE (V)
0
012345
VMAX VOLTAGE (V)
______________________________________________________________________________________ 11

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