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.
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
MAX1501
Ordering Information
PART
MAX1501ETE
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN
Typical Operating Circuit
INPUT
4.5V TO 13V
IN
BATT
4.2V 1-CELL Li+
INP
10µF
Applications
Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
1µF
MAX1501
FULLI
GLED
RLED
TEMP
TMAX
SETI
2.8kΩ
GND
VL
SELV
MODE
CHGEN
V
LOGIC
(≤ 5.5V)
R
PULLUP
ACOK
Pin Configuration appears at end of data sheet.
Bluetooth is a trademark of Ericsson.
________________________________________________________________
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, Linear Battery Charger with
Thermal Regulation for Portable Applications
MAX1501
ABSOLUTE MAXIMUM RATINGS
IN, INP,
RLED, GLED
to GND ................................-0.3V to +14V
IN to INP ................................................................-0.3V to +0.3V
VL, BATT, SETI,
ACOK, MODE, CHGEN,
SELV,
FULLI, TMAX, TEMP to GND ................................-0.3V to +6V
VL to IN...................................................................-14V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin 5mm
✕
5mm 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 .............................-65°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
(V
IN
= V
INP
= 5V, V
BATT
= 3.5V,
ACOK
=
GLED
=
RLED
= TEMP = TMAX = FULLI = open,
CHGEN
=
MODE
= GND, R
SETI
= 2.8kΩ,
C
IN
= 1µF, C
BATT
= 10µF,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
IN, INP Input Voltage
IN, INP Input Operating Range
VL Output Voltage
ACOK
Trip Point
ACOK
Sink Current
Undervoltage Lockout Trip Point
Overvoltage Lockout Trip Point
IN Input Current
4.5V
≤
V
IN
≤
6.25V, I
VL
< 250µA
V
IN
- V
BATT
, rising
V
IN
- V
BATT
, falling
V
IN
- V
BATT
, hysteresis
4.5V
≤
V
IN
≤
6.25V, V
ACOK
= 0.6V
V
IN
rising
V
IN
falling
Hysteresis
V
IN
rising
Li+, NiMH/NiCd, and no-battery modes
Disable mode
Off mode (V
IN
= 4V)
V
BATT
= 4.3V
BATT Input Current
Leakage into Battery
RMS Charge Current
Li+ mode
Battery Regulation Voltage
NiMH/NiCd mode
Output Regulation Voltage
BATT Precharge Threshold
Voltage
Fast-Charge Current-Loop
System Accuracy
No-battery mode
BATT rising
R
SETI
= 2.8kΩ
R
SETI
= 1.75 kΩ
SELV = VL
SELV = GND
SELV = VL,
V
IN
= V
INP
= 6V
SELV = GND
4.166
4.067
4.85
4.4
3.700
2.675
460
736
4.2
4.1
4.95
4.5
4.0
2.8
500
800
V
IN
= 0
Disable mode
V
IN
= V
INP
= 13V, V
BATT
= 0
Disable mode
45
3
2
6.25
75
4.05
3.9
4.125
4.025
100
6.50
5
1.5
6.75
8
3
0.25
80
10
6
5
1.4
4.234
4.133
5.05
4.6
4.234
2.925
540
864
V
V
mA
V
µA
A
µA
mA
4.20
4.1
CONDITIONS
MIN
0
4.50
2.7
40
30
3
70
55
15
µA
V
mV
V
TYP
MAX
13
6.25
3.3
100
85
mV
UNITS
V
V
V
2
_______________________________________________________________________________________
Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
INP
= 5V, V
BATT
= 3.5V,
ACOK
=
GLED
=
RLED
= TEMP = TMAX = FULLI = open,
CHGEN
=
MODE
= GND, R
SETI
= 2.8kΩ,
C
IN
= 1µF, C
BATT
= 10µF,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Precharge Current System
Accuracy
Die Temperature Regulation
Setpoint (Note 1)
Current-Sense Amplifier Gain
Internal Current-Sense
Resistance
Regulator Dropout Voltage
Logic Input Low Voltage
Logic Input High Voltage
Internal Pulldown Resistance
Internal Pullup Resistance
Internal Bias Resistance
Internal Bias Voltage
RLED
Output Low Current
GLED
Output Low Current
GLED, RLED
Output High
Leakage Current
Full-Battery Detection Current
Threshold
V
IN
- V
BATT
, NiMH/NiCd mode, V
BATT
= 4.3V,
I
BATT
= 425mA
CHGEN, MODE,
4.5V
≤
V
IN
≤
6.25V
CHGEN, MODE,
4.5V
≤
V
IN
≤
6.25V
CHGEN, MODE
SELV
FULLI, TEMP, TMAX
FULLI, TEMP, TMAX
V
RLED
= 1V
V
GLED
= 1V
V
GLED
= V
RLED
= V
IN
= V
INP
= 13V
FULLI = GND
% of fast-charge
current
Li+ mode
NiMH/NiCd mode
Charge-Timer Accuracy
TMAX = GND
Charge-Timer Duration
TMAX = open
TMAX = VL
FULLI = VL
FULLI = open
SELV = VL
SELV = GND
V
BATT
Restart Threshold
5
15
25
3.9
3.8
3.9
-10
3
4.5
6
hrs
7
14
1.25
100
100
50
175
175
90
V
VL
/2
10
20
0.1
10
20
30
4.0
3.9
4.0
18
34
1
15
25
35
4.1
4.0
4.1
+10
%
V
%
400
400
200
CONDITIONS
% of fast-charge current, V
BATT
= 2V
TEMP = GND
TEMP = open
TEMP = VL
I
BATT
to I
SETI
, precharge mode, V
BATT
= 2V
I
BATT
to I
SETI
, fast-charge mode
0.70
0.95
MIN
5
TYP
10
95
115
135
1
1
84
190
350
0.52
1.30
1.05
mA/A
mΩ
mV
V
V
kΩ
kΩ
kΩ
V
mA
mA
µA
o
MAX1501
MAX
15
UNITS
%
C
_______________________________________________________________________________________
3
Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
MAX1501
ELECTRICAL CHARACTERISTICS
(V
IN
= V
INP
= 5V, V
BATT
= 3.5V,
ACOK
=
GLED
=
RLED
= TEMP = TMAX = FULLI = open,
CHGEN
=
MODE
= GND, R
SETI
= 2.8kΩ,
C
IN
= 1µF, C
BATT
= 10µF,
T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
IN, INP Input Voltage
IN, INP Input Operating Range
VL Output Voltage
ACOK
Trip Point
ACOK
Sink Current
Undervoltage Lockout Trip Point
Overvoltage Lockout Trip Point
IN Input Current
Li+, NiMH/NiCd, and no-battery modes
Disable mode
V
BATT
= 4.3V
BATT Input Current
Leakage into Battery
RMS Charge Current
Li+ mode
Battery Regulation Voltage
NiMH/NiCd mode
Output Regulation Voltage
BATT Precharge Threshold
Voltage
Fast-Charge Current-Loop
System Accuracy
Precharge Current System
Accuracy
Current-Sense Amplifier Gain
Regulator Dropout Voltage
Logic Input Low Voltage
Logic Input High Voltage
Internal Pulldown Resistance
Internal Pullup Resistance
Internal Bias Resistance
No-battery mode
BATT rising
R
SETI
= 2.8kΩ
R
SETI
= 1.75kΩ
% of fast-charge current, V
BATT
= 2V
I
BATT
to I
SETI
, precharge mode, V
BATT
= 2V
I
BATT
to I
SETI
, fast-charge mode
V
IN
- V
BATT
, NiMH/NiCd mode, V
BATT
= 4.3V,
I
BATT
= 425mA
CHGEN, MODE,
4.5V < V
IN
< 6.25V
CHGEN, MODE,
4.5V < V
IN
< 6.25V
CHGEN, MODE
SELV
FULLI, TEMP, TMAX
1.3
100
100
50
400
400
200
SELV = VL
SELV = GND
SELV = VL
SELV = GND
4.148
4.05
4.85
4.4
3.700
2.675
460
736
5
0.60
0.93
V
IN
= 0
Disable mode
V
IN
= V
INP
= 13V, V
BATT
= 0
Disable mode
4.5V
≤
V
IN
≤
6.25V, I
VL
< 250µA
V
IN
- V
BATT
, rising
V
IN
- V
BATT
, falling
4.5V
≤
V
IN
≤
6.25V, V
ACOK
= 0.6V
V
IN
rising
V
IN
falling
CONDITIONS
MIN
0
4.50
2.7
40
30
75
4.00
3.90
6.25
4.25
4.15
6.75
8
3
80
10
6
5
1.4
4.252
4.15
5.05
4.6
4.234
2.925
540
864
15
1.40
1.07
350
0.52
V
V
mA
%
mA/A
mV
V
V
kΩ
kΩ
kΩ
V
µA
A
µA
TYP
MAX
13
6.25
3.3
100
85
UNITS
V
V
V
mV
µA
V
V
mA
4
_______________________________________________________________________________________
Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
INP
= 5V, V
BATT
= 3.5V,
ACOK
=
GLED
=
RLED
= TEMP = TMAX = FULLI = open,
CHGEN
=
MODE
= GND, R
SETI
= 2.8kΩ,
C
IN
= 1µF, C
BATT
= 10µF,
T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
RLED
Output Low Current
GLED
Output Low Current
GLED, RLED
Output High
Leakage Current
Charge-Timer Accuracy
V
RLED
= 1V
V
GLED
= 1V
V
GLED
= V
RLED
= V
IN
= V
INP
= 13V
-10
CONDITIONS
MIN
7
14
TYP
MAX
18
34
1
+10
UNITS
mA
mA
µA
%
MAX1501
Note 1:
Temperature regulation setpoint variation is typically ±9°C.
Note 2:
Specifications to T
A
= -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(V
IN
= V
INP
= 5V,
ACOK
=
RLED
=
GLED
= TEMP = TMAX = FULLI = open, C
BATT
= 10µF, C
IN
= 1µF, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX1501 toc01
DISABLE-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1501 toc02
CHARGE CURRENT
vs. BATTERY VOLTAGE
600
550
500
450
400
350
300
250
200
150
100
50
0
Li+ MODE, R
SETI
= 2.7kΩ,
V
IN
= 5V, SELV = VL
MAX1501 toc03
MAX1501 toc06
5.0
4.5
4.0
SUPPLY CURRENT (mA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
DISABLE-MODE SUPPLY CURRENT (mA)
Li+ MODE OR
NiMH/NiCd MODE,
SELV = VL, I
BATT
= 0
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)
0 1 2 3 4 5 6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
CHARGE CURRENT (mA)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
CHARGE CURRENT
vs. BATTERY VOLTAGE
600
550
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)
NiMH/NiCd, R
SETI
= 2.7kΩ,
V
IN
= 5.5V, SELV = VL
600
550
500
450
400
350
300
250
200
150
100
50
0
MAX1501 toc04
CHARGE CURRENT
vs. INPUT VOLTAGE
Li+ MODE,
SELV = VL,
R
SETI
= 2.7kΩ
600
550
500
450
400
350
300
250
200
150
100
50
0
0
MAX1501 toc05
CHARGE CURRENT
vs. INPUT-VOLTAGE HEADROOM
CHARGE CURRENT (mA)
CHARGE CURRENT (mA)
CHARGE CURRENT (mA)
NiMH/NiCd MODE, SELV = GND,
R
SETI
= 2.7kΩ, V
BATT
= 4.3V
0 1 2 3 4 5 6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
V
IN
- V
BATT
(V)
_______________________________________________________________________________________
5
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