MAX1535CETJ+T Maxim Integrated Products, MAX1535CETJ+T Datasheet

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MAX1535CETJ+T

Manufacturer Part Number
MAX1535CETJ+T
Description
Highly Integrated Level 2 SMBus Battery Chargers
Manufacturer
Maxim Integrated Products
Datasheet
19-3261; Rev 2; 10/05
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 (0.01Ω, 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.
Notebook and Subnotebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
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
♦ 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.)
PART
MAX1535BETJ
Ordering Information continued at end of data sheet.
TOP VIEW
DHIV
DHI
SRC
Applications
CSSN
CSSP
PDL
PDS
ACOK
Battery Chargers
Features
Ordering Information
PIN-
TEMP RANGE
PACKAGE
32 Thin QFN
-40°C to +85°C
T3255-4
(5mm x 5mm)
Pin Configuration
24
23
22
21
20
19
18
17
16
INT
25
26
15 SCL
27
14 SDA
28
13 THM
MAX1535B
12 V
29
DD
MAX1535C
30
11 DAC
MAX1535D
31
10 IMAX
32
9 VMAX
1
2
3
4
5
6
7
8
THIN QFN (5mm x 5mm)
PKG
CODE
1

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MAX1535CETJ+T Summary of contents

Page 1

... Notebook and Subnotebook Computers Tablet PCs Portable Equipment with Rechargeable Batteries SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products 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 ♦ ...

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Highly Integrated Level 2 SMBus Battery Chargers 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. BATT, CSIP, CSIN to GND .....................................-0.3V ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure DCIN CSSP CSSN VMAX = IMAX = REF 1µF, C LDO DHIV wise noted.) PARAMETER 10mΩ sense resistor (R1 in Figure 1) between CSSP and CSSN; ...

Page 4

Highly Integrated Level 2 SMBus Battery Chargers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure DCIN CSSP CSSN VMAX = IMAX = REF 1µF, C LDO DHIV wise noted.) PARAMETER SWITCHING REGULATOR V BATT ...

Page 5

ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure DCIN CSSP CSSN VMAX = IMAX = REF 1µF, C LDO DHIV wise noted.) PARAMETER PDL-to-PDS Switchover Time in PDS and PDL are unloaded Relearn Mode ...

Page 6

Highly Integrated Level 2 SMBus Battery Chargers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure DCIN CSSP CSSN VMAX = IMAX = REF 1µF, C LDO DHIV wise noted.) PARAMETER SCL Low Period SCL ...

Page 7

ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure DCIN CSSP CSSN VMAX = IMAX = REF 1µF, C LDO DHIV PARAMETER CSSP/CSSN Input Voltage Range CSSP/CSSN Input Current V CSSP SUPPLY AND LINEAR REGULATOR ...

Page 8

Highly Integrated Level 2 SMBus Battery Chargers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure DCIN CSSP CSSN VMAX = IMAX = REF 1µF, C LDO DHIV PARAMETER GMI Transconductance ChargeCurrent() = 0x1F80, V ...

Page 9

ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure DCIN CSSP CSSN VMAX = IMAX = REF 1µF, C LDO DHIV PARAMETER SMBus TIMING SPECIFICATIONS (V DD SMBus Frequency SMBus Free Time Start Condition Setup ...

Page 10

Highly Integrated Level 2 SMBus Battery Chargers (Circuit of Figure 20V +25°C, unless otherwise noted.) DCIN A TRANSIENT RESPONSE (BATTERY REMOVAL AND INSERTION) MAX1535 toc01 16.8VDC BATT INSERTED BATT ...

Page 11

Figure 20V +25°C, unless otherwise noted.) DCIN A EFFICIENCY vs. CHARGE CURRENT (CONSTANT-CURRENT MODE) 100 8.4V CHARGE V = 12.6V CHARGE 16.8V CHARGE ...

Page 12

Highly Integrated Level 2 SMBus Battery Chargers PIN NAME 1 DCIN DC Supply Voltage Input. Bypass DCIN to power ground (PGND) with a 1µF ceramic capacitor. 5.4V Li near - Reg ul ator Outp ut. The l i near r ...

Page 13

Detailed Description The MAX1535B/MAX1535C/MAX1535D include all the functions necessary to charge Li+, NiMH, and NiCd smart batteries. A high-efficiency, synchronous-recti- fied, step-down DC-DC converter is used to implement a precision constant-current, constant-voltage charger with input current limiting. The DC-DC converter ...

Page 14

Highly Integrated Level 2 SMBus Battery Chargers AC ADAPTER INPUT 8.5V TO 24V R3 D1 365kΩ 49.9kΩ 1µ 1MΩ INPUT C12 0.01µF C13 0.01µF HOST 10kΩ 10kΩ GPIO SCL SDA ...

Page 15

Table 1. Summary of Operating States INPUT CONDITIONS AC PRESENT POWER FAIL V DCIN DCIN V > 7.5V DCIN THM X V BATT BATT Don’t care. Setting Input-Current Limit The total input current, from ...

Page 16

Highly Integrated Level 2 SMBus Battery Chargers V DD IMAX THO DACI THC DACS THH DACV THU SMBus THM SDA SCL INT VMAX CSSP LEVEL SHIFTER CSSN CSIP LEVEL SHIFTER CSIN CCS CCI BATT CCV Figure 2. System Functional Diagram ...

Page 17

Battery present. When THM is less than 91 the battery is considered to be present. The MAX1535B/MAX1535C/MAX1535D use the THM pin to detect whether a battery is connected to the charger. When the battery is present, the ...

Page 18

Highly Integrated Level 2 SMBus Battery Chargers LOW HIGH SMBCLK SMBDATA t t HD:STA SU:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D ...

Page 19

The MAX1535B/ MAX1535C/MAX1535D support the charger commands as described in Tables 2–9. Battery-Charger Commands The MAX1535B/MAX1535C/MAX1535D support seven battery charger commands that use either Write-Word or Read-Word protocols, as summarized in Table 2. The ...

Page 20

Highly Integrated Level 2 SMBus Battery Chargers Table 3. ChargerSpec() BIT BIT NAME 0 CHARGER_SPEC 1 CHARGER_SPEC 2 CHARGER_SPEC 3 CHARGER_SPEC 4 SELECTOR_SUPPORT 5 Reserved 6 Reserved 7 Reserved 8 Reserved 9 Reserved 10 Reserved 11 Reserved 12 Reserved 13 ...

Page 21

Table 4. ChargerMode() BIT BIT NAME 0 INHIBIT_CHARGE 1 ENABLE_POLLING 2 POR_RESET 3 RESET_TO_ZERO 4 AC_PRESENT_MASK 5 BATTERY_PRESENT_MASK 6 POWER_FAIL_MASK 7 — 8 CALIBRATION_ENABLE 9 — 10 HOT_STOP 11 — 12 — 13 — 14 — 15 — Command: 0x12 ...

Page 22

Highly Integrated Level 2 SMBus Battery Chargers Table 5. ChargerStatus() BIT BIT NAME 0 CHARGE_INHIBITED 1 MASTER_MODE 2 VOLTAGE_NOT_REG 3 CURRENT_NOT_REG 4 LEVEL_2 5 LEVEL_3 6 CURRENT_OR 7 VOLTAGE_OR 8 THERMISTOR_OR 9 THERMISTOR_COLD 10 THERMISTOR_HOT 11 THERMISTOR_UR 12 ALARM_INHIBITED 13 ...

Page 23

Table 6. ChargeCurrent() BIT BIT NAME 0 — 1 — 2 — 3 — 4 — 5 — 6 — 7 Charge Current, DACI 0 8 Charge Current, DACI 1 9 Charge Current, DACI 2 10 Charge Current, DACI 3 ...

Page 24

Highly Integrated Level 2 SMBus Battery Chargers Table 7. ChargeVoltage() BIT BIT NAME 0 — 1 — 2 — 3 — 4 Charge Voltage, DACV 0 5 Charge Voltage, DACV 1 6 Charge Voltage, DACV 2 7 Charge Voltage, DACV ...

Page 25

Table 8. AlarmWarning() BIT BIT NAME 0 Error Code 1 Error Code 2 Error Code 3 Error Code 4 FULLY_DISCHARGED 5 FULLY_CHARGED 6 DISCHARGING 7 INITIALIZING 8 REMAINING_TIME_ALARM 9 REMAINING_CAPACITY_ALARM 10 Reserved 11 TERMINATE_DISCHARGE_ALARM Not used. 12 OVER_TEMP_ALARM 13 OTHER_ALARM ...

Page 26

Highly Integrated Level 2 SMBus Battery Chargers Multiple bits may be set depending on the value of the thermistor (e.g., a thermistor that is 450Ω causes both the THERMISTOR_HOT and the THERMISTOR_UR bits to be set). The thermistor may be ...

Page 27

Table 9. InputCurrent() BIT BIT NAME 0 — 1 — 2 — 3 — 4 — 5 — 6 — 7 Input Current, DACS 0 8 Input Current, DACS 1 9 Input Current, DACS 2 10 Input Current, DACS 3 ...

Page 28

Highly Integrated Level 2 SMBus Battery Chargers frequency is governed by the off-time and is dependent upon V and V . The off-time is set by the fol- DCIN BATT lowing equation: − DCIN = ...

Page 29

Additionally much higher impedance than CV C and dominates the series combination so: CV × + × OGMV × ...

Page 30

Highly Integrated Level 2 SMBus Battery Chargers Table 11. CCV Loop Poles and Zeros NAME EQUATION CCV pole 2π R OGMV CCV zero 2π Output ...

Page 31

This describes a single-pole system. Since OUT × A CSI the loop-transfer function simplifies to: R OGMI = LTF GMI + × OGMI The crossover frequency is given by: GMI = ...

Page 32

Highly Integrated Level 2 SMBus Battery Chargers 100 -20 -40 0 FREQUENCY (Hz) Figure 13. CCI Loop Response The high-side driver (DHI) swings from SRC to 5V below SRC and has a typical ...

Page 33

Choose a low-side MOSFET that has the lowest possible on-resistance (R a moderate-sized package (i.e., one or two 8-pin SO, 2 DPAK PAK), and is reasonably priced. Make ...

Page 34

Highly Integrated Level 2 SMBus Battery Chargers Table 12. Recommended Components DESIGNATION QTY 22µF ±20%, 25V X5R ceramic capacitors (2220) C1–C4 4 TDK C5750X5R1E226M 1µF ±10%, 25V X7R ceramic capacitors (1206) Murata GRM31MR71E105K C5 Taiyo Yuden TMK316BJ105KL TDK ...

Page 35

CELLS (12.6V) 4 CELLS (16.8V) 1.0 0 10µ 19V DCIN CHARGE CURRENT = (V) BATT Figure 16. Ripple Current vs. ...

Page 36

Highly Integrated Level 2 SMBus Battery Chargers MAX1535B/MAX1535C/MAX1535D is ±5%, the typical value of the input current limit should be set at 4.5A / 1.05 ≈ 4.28A. The lower limit for input current must also be considered. For chargers at ...

Page 37

IC’s analog ground is sensing at the supply’s output ter- minals without interference from IR drops and ground noise. Other high-current paths should also ...

Page 38

Highly Integrated Level 2 SMBus Battery Chargers Figure 18. MAX1535B/MAX1535C/MAX1535D PC Board Layout Example 38 ______________________________________________________________________________________ VIA CONNECTING POWER GROUND TO QUIET ANALOG GROUND HIGH-CURRENT PGND PLANE QUIET GND ISLAND KELVIN-SENSE VIAS UNDER THE SENSE RESISTOR (REFER TO EVALUATION KIT) ...

Page 39

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 39 © 2005 Maxim Integrated Products ...

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