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PDF MAX1501 Data sheet ( Hoja de datos )
| Número de pieza | MAX1501 | |
| Descripción | Highly Integrated Linear Battery Charger | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-2800; Rev 0; 4/03
Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
General Description
The MAX1501 intelligent, constant-current, constant-
voltage (CCCV), temperature-regulated battery charger
charges a single lithium-ion (Li+) cell or three-cell
NiMH/NiCd batteries. The device integrates the current-
sense resistor, PMOS pass element, and thermal-
regulation circuitry, while eliminating the reverse-
blocking Schottky diode to create the simplest charging
solution for hand-held equipment.
The MAX1501 functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast charge, top-off, and charge termination
for single-cell Li+ or three-cell NiMH/NiCd batteries.
Alternatively, the MAX1501 collaborates with a host
microprocessor to determine the best charging algorithm.
Proprietary thermal-regulation circuitry limits the die
temperature when fast charging or while exposed to high
ambient temperatures, allowing maximum charging
current without damaging the charger. The MAX1501
continually supplies a regulated output voltage under
no-battery conditions, allowing battery changing.
The device achieves high flexibility by providing an
adjustable fast-charge current, top-off current, safety
timer, and thermal-regulation setpoint. Other features
include input power detection (ACOK) and input under-/
overvoltage protection. The MAX1501 provides active-
low control inputs.
The MAX1501 accepts a 4.5V to 13V supply, but
disables charging when the input voltage exceeds
6.5V, preventing excessive power dissipation. The
MAX1501 operates over the extended temperature
range (-40°C to +85°C) and is available in a compact
16-pin thermally enhanced 5mm x 5mm thin QFN
package with 0.8mm profile.
Applications
Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
Pin Configuration appears at end of data sheet.
Bluetooth is a trademark of Ericsson.
Features
o Stand-Alone or Microprocessor-Controlled (µP)
Linear 1-Cell Li+ or 3-Cell NiMH/NiCd Battery
Charger
o No FET, Reverse-Blocking Diode, or Current-
Sense Resistor Required
o 1.4A (max) Programmable Fast-Charge Current
o +95°C, +115°C, and +135°C Proprietary
Programmable Die Temperature Regulation
Control
o 4.5V to 13V Input Voltage Range with Input
Overvoltage (OVLO) Protection Above 6.5V
o Programmable Top-Off Current Threshold: 10%,
20%, or 30% of the Fast-Charge Current
o Charge-Current Monitor for Fuel Gauging
o Programmable Safety Timer (3, 4.5, or 6 hours)
o Input Power Detection Output (ACOK) and Charge
Enable Input (CHGEN)
o Automatic Recharge
o Digital Soft-Start Limits Inrush Current
o Charge Status Outputs for LEDs or µP Interface
PART
MAX1501ETE
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN
INPUT
4.5V TO 13V
1µF
Typical Operating Circuit
2.8kΩ
IN BATT
INP
MAX1501
FULLI
GLED
RLED
TEMP
TMAX
VL
SELV
MODE
CHGEN
SETI
ACOK
GND
4.2V 1-CELL Li+
10µF
VLOGIC
(≤ 5.5V)
RPULLUP
________________________________________________________________ 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.
1 page  
Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VINP = 5V, VBATT = 3.5V, ACOK = GLED = RLED = TEMP = TMAX = FULLI = open, CHGEN = MODE = GND, RSETI = 2.8kΩ,
CIN = 1µF, CBATT = 10µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
RLED Output Low Current
GLED Output Low Current
GLED, RLED Output High
Leakage Current
V RLED = 1V
V GLED = 1V
CONDITIONS
V GLED = V RLED = VIN = VINP = 13V
MIN TYP MAX UNITS
7 18 mA
14 34 mA
1 µA
Charge-Timer Accuracy
-10 +10 %
Note 1: Temperature regulation setpoint variation is typically ±9°C.
Note 2: Specifications to TA = -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(VIN = VINP = 5V, ACOK = RLED = GLED = TEMP = TMAX = FULLI = open, CBATT = 10µF, CIN = 1µF, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. INPUT VOLTAGE
5.0
Li+ MODE OR
4.5 NiMH/NiCd MODE,
4.0 SELV = VL, IBATT = 0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. BATTERY VOLTAGE
600
550
NiMH/NiCd, RSETI = 2.7kΩ,
VIN = 5.5V, SELV = VL
500
450
400
350
300
250
200
150
100
50
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
BATTERY VOLTAGE (V)
DISABLE-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. INPUT VOLTAGE
600
550
Li+ MODE,
SELV = VL,
500 RSETI = 2.7kΩ
450
400
350
300
250
200
150
100
50
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
CHARGE CURRENT
vs. BATTERY VOLTAGE
600
550 Li+ MODE, RSETI = 2.7kΩ,
500 VIN = 5V, SELV = VL
450
400
350
300
250
200
150
100
50
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
600
550
500
450
400
350
300
250
200
150
100
50
0
0
CHARGE CURRENT
vs. INPUT-VOLTAGE HEADROOM
NiMH/NiCd MODE, SELV = GND,
RSETI = 2.7kΩ, VBATT = 4.3V
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
VIN - VBATT (V)
_______________________________________________________________________________________ 5
5 Page 
Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
Table 3. RLED and GLED Behavior
MODE
STATE
Li+ Mode or
NiMH/NiCd Mode
• 10% current-limited precharge
• Current-limited charge
• Voltage-limited charge before top-off
• Temperature-limited charge before top-off
• Voltage-limited charge after top-off
• Safety timer expires
Disable Mode
—
No Battery Mode
—
The MAX1501 precharges the NiMH/NiCd battery with
10% of the user-programmed fast-charge current at the
start of a charge cycle. Precharge ends and fast
charge begins when the battery voltage exceeds 2.8V.
Set the fast-charge current with a resistor between SETI
and GND (see the Charge-Current Selection section).
The MAX1501 enters constant-voltage mode and
decreases the charge current when the battery voltage
reaches 4.5V.
The thermal-regulation loop limits the MAX1501 die
temperature to the value selected by the TEMP input by
reducing the charge current as necessary (see the
Thermal-Regulation Selection section). This feature pro-
tects the MAX1501 from overheating when supplying
high charge currents, or while operating from high input
voltages.
Set the top-off-current threshold with the three-state
FULLI input (see the Top-Off-Current Selection section).
RLED goes high impedance and GLED asserts low
when the top-off current threshold is reached. The
MAX1501 automatically initiates recharging when the
battery voltage drops below 4V.
No-Battery Mode
Connect CHGEN and MODE to VL to place the MAX1501
in no-battery mode. An external load can be connected to
BATT in this mode. VBATT regulates to 4V in no-battery
mode, regardless of the state of SELV.
The current-control loop, voltage-control loop, and
thermal-control loop all function in no-battery mode.
The loop gain of the voltage-control loop decreases to
ensure stability with no battery present. Connect a 10µF
ceramic capacitor to BATT for stability. RLED and
GLED are both high impedance in no-battery mode.
ACOK
The ACOK output asserts low when VIN is present, 4.2V
≤ VIN ≤ 6.25V, and VIN - VBATT > 100mV. The ACOK
open-drain output requires an external 100kΩ pullup
RLED
Sinks 10mA
GLED
High impedance
High impedance
Sinks 20mA
High impedance
High impedance
High impedance
High impedance
resistor to an external supply voltage. The external
supply voltage must be less than 5.5V.
RLED and GLED Indicators
RLED and GLED serve as visual indicators that power
is applied as well as the charge status of a battery.
RLED asserts low when a wall adapter is connected
and a battery is charging, regardless of cell chemistry.
GLED asserts low when power is applied and the bat-
tery is fully charged. Both outputs go high-impedance
in shutdown. Connect the anode of each LED to IN,
and the cathode to RLED or GLED. Table 3 summa-
rizes the behavior of RLED and GLED under normal
operating conditions. Connect pullup resistors to the µP
I/O supply when interfacing RLED and GLED with a
µP’s logic inputs.
Soft-Start
A ten-step, soft-start algorithm activates when entering
fast-charge mode. The charging current ramps up in
10% increments, 20ms per step, to the full charging
current when VBATT exceeds 2.8V.
Applications Information
Charge-Current Selection
Program the charging current using an external resistor
between SETI and GND. Set the charge-current resistor
with the following equation:
RSETI
=
1000 ×
1.4V
IBATT
If VSETI = 1.4V, the current-control loop controls the
battery charging. If VSETI < 1.4V, either the voltage-
control loop or the thermal-control loop operates.
Measure the charging current by monitoring VSETI and
using the following equation:
VSETI
=
IBATT
1000
×
RSETI
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX1501.PDF ] | |
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