19-3261; Rev 2; 10/05
KIT
ATION
EVALU
BLE
AVAILA
Highly Integrated Level 2 SMBus
Battery Chargers
General Description
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 (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
♦
Charge Any Battery Chemistry (Li+, NiCd, NiMH,
Lead Acid, etc.)
MAX1535B/MAX1535C/MAX1535D
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 (0.01Ω, 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.
Ordering Information
PART
MAX1535BETJ
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
32 Thin QFN
(5mm x 5mm)
PKG
CODE
T3255-4
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
PGND
DLOV
CSIN
BATT
CSIP
GND
18
DLO
I.C.
17
16 INT
15 SCL
14 SDA
13 THM
12 V
DD
11 DAC
10 IMAX
9 VMAX
1
DCIN
2
LDO
3
ACIN
4
REF
5
GND
6
CCS
7
CCI
8
CCV
24
DHIV 25
DHI 26
SRC 27
CSSN 28
CSSP 29
PDL 30
PDS 31
ACOK 32
23
22
21
20
19
Applications
Notebook and Subnotebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
MAX1535B
MAX1535C
MAX1535D
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.
Highly Integrated Level 2 SMBus
Battery Chargers
MAX1535B/MAX1535C/MAX1535D
ABSOLUTE MAXIMUM RATINGS
DCIN, CSSP, CSSN, SRC, ACOK to GND .............-0.3V to +30V
DHIV to SRC .............................................................-6V to +0.3V
DHI, PDL, PDS to GND ...............................-0.3V to V
SRC
+ 0.3V
BATT, CSIP, CSIN to GND .....................................-0.3V to +20V
CSIP to CSIN, or CSSP to CSSN ...........................-0.3V to +0.3V
CCI, CCS, CCV, DAC, REF to GND ............-0.3V to V
LDO
+ 0.3V
V
DD
, ACIN, SCL, SDA, DLOV, LDO, THM,
INT,
IMAX,
VMAX to GND...........................................................-0.3V to +6V
DLOV to LDO.........................................................-0.3V to +0.3V
DLO to PGND............................................-0.3V to V
DLOV
+ 0.3V
PGND to GND .......................................................-0.3V to +0.3V
LDO Short-Circuit Current...................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
32-Pin Thin QFN (derate 21.3mW/°C above +70°C) ...1702mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
DD
= 3.3V, ACIN = PGND = GND, LDO = DLOV,
VMAX = IMAX = REF, C
LDO
= 1µF, C
DHIV
= 0.1µF, C
REF
= 1µF,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
CHARGE-VOLTAGE REGULATION
ChargeVoltage() = 0x41A0 and 0x3130
Charge-Voltage Accuracy
ChargeVoltage() = 0x20D0
ChargeVoltage() = 0x1060
ChargeVoltage() = 0x41A0
Full-Charge Voltage
ChargeVoltage() = 0x3130
ChargeVoltage() = 0x20D0
ChargeVoltage() = 0x1060
CHARGE-CURRENT REGULATION
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
Compliance Current Accuracy
V
BATT
= 12V
10mΩ sense resistor (R2 in Figure 1) between CSIP and
CSIN; ChargeCurrent() = 0x1F80
10mΩ sense resistor (R2 in Figure 1) between CSIP and
CSIN; ChargeCurrent() = 0x1F80
Charge Current
10mΩ sense resistor (R2 in Figure 1) between CSIP and
CSIN; ChargeCurrent() = 0x0080
BATT/CSIP/CSIN Input Voltage
Range
CSIP/CSIN Input Current
INPUT-CURRENT REGULATION
CSSP-to-CSSN Full-Scale
Current-Sense Voltage
V
DCIN
= 18V
104.5
110.0
115.5
mV
V
DCIN
= 0V, or charger not switching
V
CSIP
= V
CSIN
= 12V
0
0.1
300
128
19
1.0
700
mA
V
µA
76.60
-5
7.660
8.064
80.64
84.67
+5
8.467
mV
%
A
-0.5
-0.8
-1.0
16.716
12.529
8.332
4.150
16.800
12.592
8.400
4.192
+0.5
+0.8
+1.0
16.884
12.655
8.468
4.234
V
%
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Highly Integrated Level 2 SMBus
Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
DD
= 3.3V, ACIN = PGND = GND, LDO = DLOV,
VMAX = IMAX = REF, C
LDO
= 1µF, C
DHIV
= 0.1µF, C
REF
= 1µF,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
CONDITIONS
10mΩ sense resistor (R1 in Figure 1) between CSSP and
CSSN; InputCurrent() = 0x1580 (11.008A)
Input Current-Limit Accuracy
10mΩ sense resistor (R1 in Figure 1) between CSSP and
CSSN; InputCurrent() = 0x1000 (8.192A)
10mΩ sense resistor (R1 in Figure 1) between CSSP and
CSSN; InputCurrent() = 0x0800 (4.096A)
POR (InputCurrent() = 0x0080)
CSSP/CSSN Input Voltage Range
CSSP/CSSN Input Current
V
DCIN
= 0V
V
CSSP
= V
CSSN
= V
DCIN
> 8.0V
8
DCIN falling
DCIN rising
8V < V
DCIN
< 28V
V
BATT
= 19V, V
DCIN
= 0V, or charger not switching
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
8V < V
DCIN
< 28V, no load
0 < I
LDO
< 10mA
V
DCIN
= 8V
3.20
2.7
2.5
100
V
DCIN
< 6V, V
DD
= 5.5V, V
SCL
= V
SDA
= 5.5V
0 < I
REF
< 500µA
REF falling
4.083
17
4.096
3.1
27
4.109
3.9
5.25
7.0
7.4
7.50
2.7
0.1
200
5.40
34
4.00
7.85
6.0
1.0
500
5.50
100
5.15
5.5
2.7
8
0.1
300
MIN
-5
-3
-6.5
256
28
1.0
750
28
TYP
MAX
+5
+3
+6.5
mA
V
µA
%
UNITS
MAX1535B/MAX1535C/MAX1535D
SUPPLY AND LINEAR REGULATOR
DCIN Input Voltage Range
DCIN Undervoltage-Lockout Trip
Point
DCIN Quiescent Current
BATT Input Current
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage Lockout Trip
Point
V
DD
Range
V
DD
UVLO Rising Threshold
V
DD
UVLO Hysteresis
V
DD
Quiescent Current
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout Trip
Point
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
V
ACIN
= 2.048V
ACIN rising
V
DCIN
- V
BATT
, DCIN falling
50
100
1.966
10
-1
100
200
2.048
20
150
300
2.130
30
+1
mV
mV
V
mV
µA
V
V
V
V
mA
µA
V
mV
V
V
V
mV
µA
_______________________________________________________________________________________
3
Highly Integrated Level 2 SMBus
Battery Chargers
MAX1535B/MAX1535C/MAX1535D
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
DD
= 3.3V, ACIN = PGND = GND, LDO = DLOV,
VMAX = IMAX = REF, C
LDO
= 1µF, C
DHIV
= 0.1µF, C
REF
= 1µF,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
SWITCHING REGULATOR
Off-Time
DLOV Supply Current
Maximum Discontinuous Mode
Peak Current
Battery Undervoltage Charge
Current
DHIV Output Voltage
DHIV Sink Current
DHI On-Resistance Low
DHI On-Resistance High
DLO On-Resistance High
DLO On-Resistance Low
ERROR AMPLIFIERS
GMV Transconductance
GMI Transconductance
GMS Transconductance
CCI Clamp Voltage
CCV Clamp Voltage
CCS Clamp Voltage
ACOK
ACOK Input Voltage Range
ACOK Sink Current
ACOK Leakage Current
PDS, PDL SWITCH CONTROL
PDS Switch Turn-Off Threshold
PDL Switch Turn-On Threshold
PDS Switch Threshold Hysteresis
PDL Switch Threshold Hysteresis
PDS Output Low Voltage, PDS
Below SRC
PDS Turn-On Current
PDS Turn-Off Current
PDL Turn-On Resistance
PDL Turn-Off Current
PDL and PDS Transition Delay
Time
DCIN with respect to BATT, DCIN falling
DCIN with respect to BATT, DCIN falling
DCIN with respect to BATT
DCIN with respect to BATT
I
PDS
= 0V
PDS = SRC
V
PDS
= V
SRC
- 2V, V
DCIN
= 16V
PDL = GND
V
CSSN
- V
PDL
= 1.5V
PDS and PDL are unloaded
8
6
10
50
6
4
50
50
100
100
200
200
10
12
50
100
12
10
15
150
12
150
150
mV
mV
mV
mV
V
mA
mA
kΩ
mA
µs
V
ACOK
= 0.4V, ACIN = 1.5V
V
ACOK
= 28V, ACIN = 2.5V
0
1
1
28
V
mA
µA
ChargeVoltage () = 0x41A0, V
BATT
= 16.8V
ChargeCurrent () = 0x1F80, V
CSIP
- V
CSIN
= 80.64mV
InputCurrent () = 0x1580, V
CSSP
- V
CSSN
= 110.08mV
0.25V < V
CCI
< 2.0V
0.25V < V
CCV
< 2.0V
0.25V < V
CCS
< 2.0V
0.0625
0.5
0.5
150
150
150
0.1250
1
1
300
300
300
0.2500
2
2
600
600
600
µA/mV
µA/mV
µA/mV
mV
mV
mV
V
DHI
= V
DHIV
, I
DHI
= -10mA
V
DHI
= V
SRC
, I
DHI
= 10mA
V
DLOV
= 4.5V, I
DLO
= 100mA
V
DLOV
= 4.5V, I
DLO
= -100mA
V
BATT
= 2.6V
With respect to SRC
-4.5
10
4
1
4
1
7
3
7
3
V
BATT
= 16.0, V
DCIN
= 21.0
V
BATT
= 19.0, V
DCIN
= 21.0
ChargerMode() = 0x0001
540
230
600
270
5
0.5
128
-5.0
-5.5
660
310
10
ns
µA
A
mA
V
mA
Ω
Ω
Ω
Ω
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
Highly Integrated Level 2 SMBus
Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
DD
= 3.3V, ACIN = PGND = GND, LDO = DLOV,
VMAX = IMAX = REF, C
LDO
= 1µF, C
DHIV
= 0.1µF, C
REF
= 1µF,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
PDL-to-PDS Switchover Time in
Relearn Mode
V
BATT
to V
VMAX
Ratio
V
MAX
Input Voltage Range
V
MAX
Input Bias Current
I
CHARGE
to V
IMAX
Ratio
IMAX Input Voltage Range
IMAX Input Bias Current
THERMISTOR COMPARATOR
Thermistor Overrange Threshold
Thermistor Cold Threshold
Thermistor Hot Threshold
Thermistor Underrange
Threshold
Thermistor Comparator
Hysteresis
SDA/SCL Input Low Voltage
SDA/SCL Input High Voltage
SDA/SCL Input Bias Current
SDA,
INT
Output Sink Current
INT
Output Low Voltage
SMBus Frequency
SMBus Free Time
Start Condition Setup Time from
SCL
Start Condition Hold Time from
SCL
Stop Condition Setup Time from
SCL
SDA Hold Time from SCL
SDA Setup Time from SCL
SCL Low Timeout
(Note 1)
V
DD
= 2.7V to 5.5V, THM falling
V
DD
= 2.7V to 5.5V, THM falling
V
DD
= 2.7V to 5.5V, THM falling
V
DD
= 2.7V to 5.5V, THM falling
All four comparators, V
DD
= 2.7V to 5.5V
89.5
73.5
21.5
3.5
91
75
23
5
50
92.5
76.5
24.5
6.5
% of V
DD
% of V
DD
% of V
DD
% of V
DD
mV
0 < V
IMAX
< V
REF
0 < V
VMAX
< V
REF
V
IMAX
= 0.8V, ChargeCurrent () = 0x1F80
4.75
0
5
MAXIMUM CHARGE-CURRENT SETTING
5.25
V
REF
1
A/V
V
µA
CONDITIONS
PDS and PDL are unloaded
MIN
4
TYP
10
MAX
16
UNITS
µs
MAX1535B/MAX1535C/MAX1535D
MAXIMUM CHARGE-VOLTAGE SETTING
V
MAX
= 2V, ChargeVoltage () = 0x4B00
4.95
0
5.0
5.05
V
REF
1
V/V
V
µA
SMBus INTERFACE LEVEL SPECIFICATIONS (V
DD
= 2.7V to 5.5V)
V
DD
= 2.7V to 5.5V
V
DD
= 2.7V to 5.5V
V
DD
= 2.7V to 5.5V
VSDA = 0.4V
I
INT
= 1mA
10
4.7
4.7
4
4
300
250
25
35
2.1
-1
6
1
25
200
100
+1
0.8
V
V
µA
mA
µA
mV
kHz
µs
µs
µs
µs
ns
ns
ms
INT
Output High Leakage Current V
INT
= 5.5V
SMBus TIMING SPECIFICATIONS (V
DD
= 2.7V to 5.5V)
_______________________________________________________________________________________
5
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