MAX1647EAP ,Chemistry-Independent Battery ChargersApplicationsMAX1647EAP -40°C to +85°C 20 SSOPNotebook ComputersMAX1648ESE -40°C to +85°C 16 Narrow ..
MAX1647EAP ,Chemistry-Independent Battery ChargersFeaturesThe MAX1647/MAX1648 provide the power control neces-' Charges Any Battery Chemistry: sary ..
MAX1647EAP+ ,Chemistry-Independent Battery ChargersApplicationsMAX1647EAP -40°C to +85°C 20 SSOPNotebook ComputersMAX1648ESE -40°C to +85°C 16 Narrow ..
MAX1648ESE ,Chemistry-Independent Battery ChargersELECTRICAL CHARACTERISTICS(V = 18V, V = 4.096V, T = 0°C to +85°C. Typical values are at T = +25°C, ..
MAX1649CPA ,5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC ControllersELECTRICAL CHARACTERISTICS(V+ = 5V, T = T to T , unless otherwise noted. Typical values are at T = ..
MAX1649CSA ,5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC ControllersFeaturesThe MAX1649/MAX1651 BiCMOS, step-down, DC-DC ' More than 90% Efficiency (10mA to 1.5A Loads ..
MAX4400AUK+T ,Single/Dual/Quad, Low-Cost, Single-Supply, Rail-to-Rail Op Amps with Shutdownapplications.● 1.4mA of Sink and Source Load CurrentThe MAX4400 single amplifier is available in ul ..
MAX4400AUK-T ,Single/Dual/Quad / Low-Cost / Single-Supply / Rail-to-Rail Op Amps with ShutdownELECTRICAL CHARACTERISTICS (continued)(V = +5V, V = 0, V = 0, V = V /2, R = ∞ connected to V /2, SH ..
MAX4400AXK+T ,Single/Dual/Quad, Low-Cost, Single-Supply, Rail-to-Rail Op Amps with ShutdownElectrical Characteristics (continued)(V = +5V, V = 0V, V = 0V, V = V /2, R = ∞ connected to V /2, ..
MAX4400AXK-T ,Single/Dual/Quad / Low-Cost / Single-Supply / Rail-to-Rail Op Amps with ShutdownELECTRICAL CHARACTERISTICS(V = +5V, V = 0, V = 0, V = V /2, R = ∞ connected to V /2, SHDN = V (MAX4 ..
MAX4400AXK-T ,Single/Dual/Quad / Low-Cost / Single-Supply / Rail-to-Rail Op Amps with ShutdownApplications*Future product—contact factory for availability.Single-Supply Zero-Crossing DetectorsI ..
MAX4401AXT ,Single/Dual/Quad, Low-Cost, Single-Supply, Rail-to-Rail Op Amps with ShutdownElectrical Characteristics(V = +5V, V = 0V, V = 0V, V = V /2, R = ∞ connected to V /2, SHDN = V (MA ..
MAX1647EAP-MAX1648ESE
Chemistry-Independent Battery Chargers
_______________General DescriptionThe MAX1647/MAX1648 provide the power control neces-
sary to charge batteries of any chemistry. In the MAX1647,
all charging functions are controlled via the Intel System
Management Bus (SMBus™) interface. The SMBus 2-wire
serial interface sets the charge voltage and current, and
provides thermal status information. The MAX1647 func-
tions as a level 2 charger, compliant with the Duracell/Intel
Smart Battery Charger Specification. The MAX1648 omits
the SMBus serial interface, and instead sets the charge
voltage and current proportional to the voltage applied to
external control pins.
In addition to the feature set required for a level 2 charger,
the MAX1647 generates interrupts to signal the host when
power is applied to the charger or a battery is installed or
removed. Additional status bits allow the host to check
whether the charger has enough input voltage, and
whether the voltage on or current into the battery is being
regulated. This allows the host to determine when lithium-
ion batteries have completed charge without interrogating
the battery.
The MAX1647 is available in a 20-pin SSOP with a 2mm
profile height. The MAX1648 is available in a 16-pin SO
package.
________________________ApplicationsNotebook Computers
Personal Digital Assistants
Charger Base Stations
Phones
____________________________FeaturesCharges Any Battery Chemistry:
Li-Ion, NiCd, NiMH, Lead Acid, etc.Intel SMBus 2-Wire Serial Interface (MAX1647)Intel/Duracell Level 2 Smart Battery Compliant
(MAX1647)4A, 2A, or 1A Maximum Battery-Charge Current11-Bit Control of Charge CurrentUp to 18V Battery Voltage10-Bit Control of Voltage±0.75% Voltage Accuracy with External ±0.1%
ReferenceUp to 28V Input VoltageBattery Thermistor Fail-Safe Protection
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
__________________________________________________________Pin ConfigurationsSMBus is a trademark of Intel Corp.
19-1158; Rev 0; 12/96
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDCIN= 18V, VREF= 4.096V, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
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.
DCIN to AGND..........................................................-0.3V to 30V
DCIN to IOUT...........................................................-0.3V to 7.5V
BST to AGND............................................................-0.3V to 36V
BST, DHI to LX............................................................-0.3V to 6V
LX to AGND..............................................................-0.3V to 30V
THM, CCI, CCV, DACV, REF,
DLO to AGND................................................-0.3V to (VL + 0.3V)
VL, SEL, INT, SDA, SCL to AGND (MAX1647)...........-0.3V to 6V
SETV, SETI to AGND (MAX1648)................................-0.3V to 6V
BATT, CS+ to AGND.................................................-0.3V to 20V
PGND to AGND.....................................................-0.3V to +0.3V
SDA, INTCurrent................................................................50mA
VL Current...........................................................................50mA
Continuous Power Dissipation (TA= +70°C)
16-Pin SO (derate 8.7mW/°C above +70°C).................696mW
20-Pin SSOP (derate 8mW/°C above +70°C)...............640mW
Operating Temperature Range
MAX1647EAP, MAX1648ESE...........................-40°C to +85°C
Storage Temperature.........................................-60°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)(VDCIN= 18V, VREF= 4.096V, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
Note 1:When DCIN is less than 4V, VL is less than 3.2V, causing the battery current to be typically 2µA (CS plus BATT input
current).
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
ELECTRICAL CHARACTERISTICS(VDCIN= 18V, VREF= 4.096V, TA
= -40°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted. Limits over this
temperature range are guaranteed by design.)
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
TIMING CHARACTERISTICS—MAX1647(TA
= 0°C to +85°C, unless otherwise noted.)
TIMING CHARACTERISTICS—MAX1647(TA
= -40°C to +85°C, unless otherwise noted. Limits over this temperature range are guaranteed by design.)
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
__________________________________________Typical Operating Characteristics
(Circuit of Figure 3, TA = +25°C, unless otherwise noted.)
VL VOLTAGE vs. LOAD CURRENTMAX1647/48-03
LOAD CURRENT (mA)
VL (V)
INTERNAL REFERENCE VOLTAGE
MAX1647/48-04
LOAD CURRENT (mA)
REF
(V)
INPUT AND OUTPUT POWER
MAX1647/48-05
CURRENT INTO BATT (mA)
POWER (W)
MAX1647
OUTPUT V-I CHARACTERISTIC
MAX1647/48-06
LOAD CURRENT (mA)
DROP IN BATT OUTPUT VOLTAGE (%)
0.01
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
______________________________________________________________Pin Description
MAX1647/MAX1648
Chemistry-Independent
Battery ChargersFigure 1. SMBus Serial Interface Timing—Address
Figure 2. SMBus Serial Interface Timing—Acknowledge
MAX1647/MAX1648
Chemistry-Independent
Battery ChargersFigure 3. MAX1647 Typical Application Circuit
MAX1647/MAX1648
Chemistry-Independent
Battery Chargers
Table 1a. Component Selection for Figure 3 Circuit (Also Use for Figure 4)
_______________Detailed Description
Output CharacteristicsThe MAX1647/MAX1648 contain both a voltage-
regulation loop and a current-regulation loop. Both
loops operate independently of each other. The volt-
age-regulation loop monitors BATT to ensure that its
voltage never exceeds the voltage set point (V0). The
current-regulation loop monitors current delivered to
BATT to ensure that it never exceeds the current-limit
set point (I0). The current-regulation loop is in control
as long as BATT voltage is below V0. When BATT volt-
age reaches V0, the current loop no longer regulates,
and the voltage-regulation loop takes over. Figure 5
shows the V-I characteristic at the BATT pin.
MAX1647/MAX1648
Chemistry-Independent
Battery ChargersFigure 4. MAX1648 Typical Operating Circuit
MAX1647/MAX1648
Setting V0 and I0 (MAX1647)Set the MAX1647’s voltage and current-limit set points
via the Intel System Management Bus (SMBus™) 2-wire
serial interface. The MAX1647’s logic interprets the
serial-data stream from the SMBus interface to set inter-
nal digital-to-analog converters (DACs) appropriately.
See the MAX1647 Logicsection for more information.
Setting V0 and I0 (MAX1648)Set the MAX1648’s voltage- and current-limit set points
(V0 and I0, respectively) using external resistive dividers.
Figure 6b is the MAX1648 block diagram. V0 equals four
times the voltage on the SETV pin. I0 equals the voltage
on SETI divided by 5.5, divided by R1 (Figure 4).
_____________________Analog SectionThe MAX1647/MAX1648 analog section consists of a
current-mode PWM controller and two transconduc-
tance error amplifiers: one for regulating current and
the other for regulating voltage. The MAX1647 uses
DACs to set the current and voltage level, which are
controlled via the SMBus interface. The MAX1648 elimi-
nates the DACs and controls the error amplifiers direct-
ly from SETI (for current) and SETV (for voltage). Since
separate amplifiers are used for voltage and current
control, both control loops can be compensated sepa-
rately for optimum stability and response in each state.
The following discussion relates to the MAX1647; how-
ever, MAX1648 operation can easily be inferred from
the MAX1647.
Whether the MAX1647 is controlling the voltage or cur-
rent at any time depends on the battery’s state. If the
battery has been discharged, the MAX1647’s output
reaches the current-regulation limit before the voltage
limit, causing the system to regulate current. As the bat-
tery charges, the voltage rises until the voltage limit is
reached, and the charger switches to regulating voltage.
The transition from current to voltage regulation is done
by the charger, and need not be controlled by the host.
Voltage ControlThe internal GMV amplifier controls the MAX1647’s out-
put voltage. The voltage at the amplifier’s noninverting
input amplifier is set by a 10-bit DAC, which is controlled
by a ChargingVoltage( ) command on the SMBus (see
the MAX1647 Logicsection for more information). The
battery voltage is fed to the GMV amplifier through a 4:1
resistive voltage divider. With an external 4.096V refer-
ence, the set voltage ranges between 0 and 16.38V with
16mV resolution.
This poses a challenge for charging four lithium-ion
cells in series: because the lithium-ion battery’s typical
per-cell voltage is 4.2V maximum, 16.8V is required. A
larger reference voltage can be used to circumvent
this. Under this condition, the maximum battery voltage
no longer matches the programmed voltage. The solu-
tion is to use a 4.2V reference and host software.
Contact Maxim’s applications department for more
information.
The GMV amplifier’s output is connected to the CCV
pin, which compensates the voltage-regulation loop.
Typically, a series-resistor/capacitor combination can
be used to form a pole-zero couplet. The pole intro-
duced rolls off the gain starting at low frequencies. The
zero of the couplet provides sufficient AC gain at mid-
frequencies. The output capacitor then rolls off the mid-
frequency gain to below 1, to guarantee stability before
encountering the zero introduced by the output capaci-
tor’s equivalent series resistance (ESR). The GMV
amplifier’s output is internally clamped to between one-
fourth and three-fourths of the voltage at REF.
Current ControlThe internal GMI amplifier and an internal current
source control the battery current while the charger is
regulating current. Since the regulator current’s accura-
cy is not adequate to ensure full 11-bit accuracy, an
internal linear current source is used in conjunction with
the PWM regulator to set the battery current. The cur-
rent-control DAC’s five least significant bits set the
Chemistry-Independent
Battery Chargers
