MAX17435 Datasheet PDF - Maxim Integrated Products
| Part Number | MAX17435 | |
| Description | High-Frequency Low-Cost SMBus Chargers | |
| Manufacturers | Maxim Integrated Products | |
| Logo |  |
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19-4817; Rev 1; 9/10
EVAALVUAAILTAIOBNLEKIT
High-Frequency,
Low-Cost SMBus Chargers
General Description
The MAX17435/MAX17535 integrated multichemistry
battery-charger ICs simplify construction of accurate
and efficient chargers. The MAX17435/MAX17535
provide SMBusK-programmable charge current, charge
voltage, input current limit, relearn voltage, and digital
readback of the IINP voltage. The MAX17435/MAX17535
utilize a charge pump to control the adapter selection
n-channel MOSFETs when the adapter is present. When
the adapter is absent, the charge pump is shut down and
a p-channel MOSFET selects the battery.
The MAX17435/MAX17535 provide up to 7A of charge
current to 2, 3, or 4 lithium-ion (Li+) cells in series. The
charge current, and input current-limit sense amplifiers have
low offset errors and can use 10mI sense resistors. The
MAX17435/MAX17535 fixed-inductor ripple architecture
significantly reduces component size and circuit cost.
The MAX17435/MAX17535 provide a digital output that
indicates the presence of the adapter, an analog output
that indicates the adapter or battery current, depending
upon the presence or absence of the adapter, and a
digital output that indicates when the adapter current
exceeds a user-defined threshold.
The MAX17435 switches at an 850kHz frequency and the
MAX17535 switches at 500kHz.
The MAX17435/MAX17535 are available in a small, 4mm
x 4mm x 0.75mm, 24-pin, lead-free TQFN package. An
evaluation kit is available.
Applications
Notebook Computers
PDAs and Mobile Communicators
2- to 4- Li+ Cell Battery-Powered Devices
Features
S Low-Cost SMBus Charger
S High Switching Frequency (0.85MHz/0.5MHz)
S Internal Boost Switches
S SMBus-Programmable Charge Voltage, Input
Current Limit, Charge Current, Relearn Voltage,
and Digital IINP Readback
S Single-Point Compensation
S Automatic Selection of System Power Source
Adapter n-Channel MOSFETs Driven by an
Internal Dedicated Charge Pump
Adapter Soft-Start
S ±0.4% Accurate Charge Voltage
S ±2.5% Accurate Input Current Limiting
S ±3% Accurate Charge Current
S Monitor Outputs for
AC Adapter Current (±2% Accuracy)
Battery Discharge Current (±2% Accuracy)
AC Adapter Presence
S AC Adapter Overvoltage Protection
S 11-Bit Battery Voltage Setting
S 6-Bit, Charge-Current Setting/Input Current Setting
S Improved IINP Accuracy at Low Input Current
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17435ETG+
-40NC to +85NC 24 TQFN-EP*
MAX17535ETG+
-40NC to +85NC 24 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
18 17 16 15 14 13
ACIN 19
12 CSIP
ITHR 20
11 CSIN
VAA 21
VCC 22
GND 23
EN 24
MAX17435
MAX17535
10 ACOK
9 DHI
8 LX
7 BST
12 3456
SMBus is a trademark of Intel Corp.
________________________________________________________________ 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.
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High-Frequency,
Low-Cost SMBus Chargers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, no load on LDO, VDCIN = VCSSP = VCSSN = 19V, VLX = 0V, VBST - VLX = 5V, VBATT = VCSIP = VCSIN = 16.8V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
ADAPTER OVERVOLTAGE PROTECTION
ACOVP Threshold
Rising
ACOVP Threshold Hysteresis
ADAPTER OVERCURRENT PROTECTION
ACOCP Threshold
With respect to VCSSP - VCSSN
ACOCP Blanking Time
MIN TYP MAX UNITS
2.04
2
2.1
V
30 mV
144 mV
16 ms
ACOCP Waiting Time
When ACOCP comparator is high and at the
time the blanking time expires
0.6
s
PDSL SWITCH CONTROL
PDSL Turn-Off Resistance
SMBus TIMING SPECIFICATIONS
SMBus Frequency
Bus Free Time
fSMB
tBUF
START Condition Hold Time
from SCL
tHD:STA
2.5 4
kI
10 100 kHz
4.7 Fs
4 Fs
START Condition Setup Time
from SCL
tSU:STA
4.7 Fs
STOP Condition Setup Time
from SCL
tSU:STO
4 Fs
Holdup Time from SCL
Setup Time from SCL
SCL Low Period
SCL High Period
tHD:DAT
tSU:DAT
tLOW
tHIGH
300 ns
250 ns
4.7 Fs
4 Fs
Maximum Charging Period
Without a Charge_Voltage() or
ChargeCurrent() Command
140 175 210
s
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, no load on LDO, VDCIN = VCSSP = VCSSN = 19V, VLX = 0V, VBST - VLX = 5V, VBATT = VCSIP = VCSIN = 16.8V,
TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
INPUT SUPPLIES
SYMBOL
CONDITIONS
MIN MAX UNITS
Adapter Present Quiescent
Current
IDCIN + ICSSP +
ICSSN (Note 1)
Charging enabled,
VADAPTER = 19V,
VBATTERY = 16.8V
Charging disabled
6 mA
2.2 mA
_______________________________________________________________________________________ 5
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