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PDF MAX1535C Data sheet ( Hoja de datos )

Número de pieza MAX1535C
Descripción Highly Integrated Level 2 SMBus Battery Chargers
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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19-3261; Rev 2; 10/05
EVAALVUAAILTAIOBNLEKIT
Highly Integrated Level 2 SMBus
Battery Chargers
General Description
The MAX1535B/MAX1535C/MAX1535D are highly inte-
grated, multichemistry battery chargers that simplify con-
struction of advanced smart chargers with a minimum
number of external components. They use Intel’s system
management bus (SMBus™) to control the charge volt-
age, charge current, and the maximum current drawn
from the AC adapter. High efficiency is achieved through
use of a constant off-time step-down topology with syn-
chronous rectification.
In addition to support of the Smart-Battery-Charger
Specifications Rev 1.1, the MAX1535B/MAX1535C/
MAX1535D include additional features. The maximum
current drawn from the AC adapter is programmable to
avoid overloads when supplying the load and the battery
charger simultaneously. This enables the user to reduce
the cost of the AC adapter. The MAX1535B/MAX1535C/
MAX1535D provide a digital output that indicates the
presence of an AC adapter. Based on the presence or
absence of the AC adapter, the MAX1535B/MAX1535C/
MAX1535D automatically select the appropriate source
for supplying power to the system by controlling two
external p-channel MOSFETs. Under system control, the
MAX1535B/MAX1535C/MAX1535D allow the battery to
undergo a relearning or conditioning cycle in which the
battery is completely discharged through the system
load and then recharged.
The MAX1535B/MAX1535C/MAX1535D are capable of
charging 2, 3, or 4 lithium-ion (Li+) cells in series, provid-
ing charge currents as high as 8A. The DC-DC converter
in the MAX1535B/MAX1535C/MAX1535D uses a high-
side p-channel switch with an n-channel synchronous
rectifier. The charge current and input current-limit sense
amplifiers have low input-offset errors and can use small-
value sense resistors (0.01, typ).
The MAX1535B/MAX1535C/MAX1535D are available in
a 5mm x 5mm, 32-pin, thin QFN package and operate
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
Use Small (10m) 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
Charge Any Battery Chemistry (Li+, NiCd, NiMH,
Lead Acid, etc.)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX1535BETJ -40°C to +85°C
32 Thin QFN
(5mm x 5mm)
T3255-4
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
24 23 22 21 20 19 18 17
DHIV 25
DHI 26
SRC 27
CSSN 28
CSSP 29
PDL 30
PDS 31
ACOK 32
MAX1535B
MAX1535C
MAX1535D
16 INT
15 SCL
14 SDA
13 THM
12 VDD
11 DAC
10 IMAX
9 VMAX
12345678
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




MAX1535C pdf
Highly Integrated Level 2 SMBus
Battery Chargers
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
PDL-to-PDS Switchover Time in
Relearn Mode
PDS and PDL are unloaded
MAXIMUM 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
MIN TYP MAX UNITS
4 10 16 µs
4.95
0
5.0 5.05
VREF
1
V/V
V
µA
4.75
0
5 5.25 A/V
VREF
V
1 µA
89.5
73.5
21.5
3.5
91 92.5 % of VDD
75 76.5 % of VDD
23 24.5 % of VDD
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
SDA, INT Output Sink Current
VDD = 2.7V to 5.5V
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





MAX1535C arduino
Highly Integrated Level 2 SMBus
Battery Chargers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VDCIN = 20V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. CHARGE CURRENT
(CONSTANT-CURRENT MODE)
100
90
80 VCHARGE = 8.4V
70 VCHARGE = 12.6V
VCHARGE = 16.8V
60
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
246
CHARGECURRENT() SETTING (A)
8
-5.0
-7.5
0
2 4 6 8 10
INPUTCURRENT() SETTING (A)
12
2
CHARGE CURRENT
0
0246
8
SYSTEM LOAD CURRENT (A)
MAXIMUM CHARGE VOLTAGE vs. IMAX
10
MAXIMUM CHARGE CURRENT vs. VMAX
20
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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