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Maxim Integrated Products - Highly Integrated Level 2 SMBus Battery Chargers

Numéro de référence MAX1535C
Description Highly Integrated Level 2 SMBus Battery Chargers
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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MAX1535C fiche technique
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.

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