MAX1535 Maxim Integrated Products, MAX1535 Datasheet
MAX1535
Manufacturer Part Number
MAX1535
Description
Highly Integrated Level 2 Smbus Battery Charger
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1535.pdf
(39 pages)
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The MAX1535 is a highly integrated, multichemistry bat-
tery 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-
time step-down topology with synchronous rectification.
In addition to support of the Smart Battery Charger
Specifications Rev 1.1, the MAX1535 includes addition-
al features. The maximum current drawn from the AC
adapter is programmable to avoid overloads when sup-
plying the load and the battery charger simultaneously.
This enables the user to reduce the cost of the AC
adapter. The MAX1535 provides a digital output that
indicates the presence of an AC adapter. Based on the
presence or absence of the AC adapter, the MAX1535
automatically selects the appropriate source for supply-
ing power to the system by controlling two external P-
channel MOSFETs. Under system control, the MAX1535
allows the battery to undergo a relearning or condition-
ing cycle in which the battery is completely discharged
through the system load and then recharged.
The MAX1535 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 MAX1535
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 MAX1535 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.
19-2848; Rev 0; 4/03
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.
Notebook and Subnotebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Highly Integrated Level 2 SMBus
o Compliant with Level 2 Smart Battery Charger
o Intel SMBus 2-Wire Serial Interface
o ±0.5% Charge-Voltage Accuracy
o 11-Bit Charge-Voltage Resolution
o ±3% Input Current-Limit Accuracy
o Uses Small (10mΩ) Current-Sense Resistors
o 8A Maximum Charge Current
o 6-Bit Input and Charge-Current Resolution
o 8V to 28V Input Voltage Range
o 175s Charge Safety Timer
o Automatic Selection of System Power Source
o Charges Any Battery Chemistry (Li+, NiCd, NiMH,
MAX1535ETJ
TOP VIEW
Specifications Rev 1.1
Lead Acid, etc.)
PART
DCIN
ACIN
GND
CCS
CCV
LDO
REF
CCI
1
2
3
4
5
6
7
8
TEMP RANGE
-40°C to +85°C
32
9
Battery Charger
31
10
THIN QFN (5mm x 5mm)
Ordering Information
30
11
MAX1535
29
12
Pin Configuration
28
13
PIN-PACKAGE
32 Thin QFN (5mm x 5mm)
27
14
26
15
25
16
Features
24 DLOV
23 DLO
22 PGND
21 CSIP
20 CSIN
19 BATT
18 GND
17 I.C.
1
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