MCP73837/8
Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge
Management Controller with Autonomous AC-Adapter or
USB-Port Source Selection
Features
• High Accuracy Preset Voltage Regulation: + 0.5%
• Available Voltage Regulation Options:
- 4.20V, 4.35V, 4.4V, or 4.5V
• Complete Linear Charge Management Controller:
- Autonomous Power Source Selection
- Integrated Pass Transistors
- Integrated Current Sense
- Integrated Reverse Discharge Protection
• Constant Current (CC) / Constant Voltage (CV)
Operation with Thermal Regulation
• Selectable USB-Port Charge Current:
- Low: 1 Unit Load / High: 5 Unit Loads
• Programmable AC-Adapter Charge Current:
- 15 mA - 1000 mA
• Two Charge Status Outputs
• Power-Good Monitor: MCP73837
• Timer Enable: MCP73838
• Automatic Recharge:
- Selectable Voltage Threshold
• Automatic End-of-Charge Control:
- Selectable Charge Termination Current Ratio
- Selectable Safety Timer Period
• Preconditioning of Deeply Depleted Cells - Can
Be Disabled
• Battery Cell Temperature Monitor
• UVLO (Undervoltage Lockout)
• Automatic Power-Down when Input Power is
Removed
• Low-Dropout (LDO) Linear Regulator Mode
• Numerous Selectable Options Available for a
Variety of Applications:
- Refer to
Section 1.0 “Electrical
Characteristics”
for Selectable Options
- Refer to the
“Product
Identification
System”
for Standard Options
• Temperature Range: -40°C to 85°C
• Packaging:
- 10-Lead 3 mm x 3 mm DFN
- 10-Lead MSOP*
* Consult Factory for MSOP package
availability.
Applications
• Smart Phones and Personal Data Assistants
(PDA)
• Portable Media Players (PMP)
• Ultra Mobile Devices (UMD)
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• Handheld Medical Devices
• AC/USB Dual Source Li-Ion Battery Chargers
Description
The MCP73837 and MCP73838 devices are fully
integrated linear Li-Ion / Li-Polymer battery chargers
with autonomous power source selection. Along with its
small physical size, the low number of external
components required makes the MCP73837/8 ideally
suitable for portable applications.
The MCP73837/8 automatically selects the USB-port
or AC-adapter as the power source for the system. For
the USB-port powered systems, the MCP73837/8
specifically adheres to the current limits governed by
the USB specification. The host microcontroller can
select from two preset maximum charge current rates
of 100 mA (low power USB-port) or 500 mA (high
power USB-port). With an AC-adapter providing power
to the system, an external resistor sets the magnitude
of the system or charge current up to a maximum of 1A.
The MCP73837/8 employs a constant current/constant
voltage
charge
algorithm
with
selectable
preconditioning and charge termination. The constant
voltage regulation is fixed with four available options:
4.20V, 4.35V, 4.40V, or 4.50V, to accommodate the
new emerging battery charging requirements. The
MCP73837/8 limits the charge current, based on die
temperature, during high power or high ambient
conditions. This thermal regulation optimizes the
charge cycle time while maintaining the device
reliability.
The MCP73837/8 are fully specified over the ambient
temperature range of -40°C to +85°C.
The MCP73837/8 devices are available in a 10-Lead,
3 mm x 3 mm, DFN package or in a 10-Lead MSOP
package.
©
2007-2011 Microchip Technology Inc.
DS22071B-page 1
MCP73837/8
1.0
ELECTRICAL
CHARACTERISTICS
† Notice:
Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
Absolute Maximum Ratings†
V
DD
N
................................................................................7.0V
All Inputs and Outputs w.r.t. V
SS
............... -0.3 to (V
DD
+0.3)V
Maximum Junction Temperature, T
J
............Internally Limited
Storage temperature .....................................-65°C to +150°C
ESD protection on all pins
Human Body Model (1.5 kW in Series with 100 pF)
......≥
4 kV
Machine Model (200 pF, No Series Resistance) .............300V
DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typical) + 0.3V] to 6V,
T
A
= -40°C to +85°C. Typical values are at +25°C, V
DD
= [V
REG
(typical) + 1.0V]
Parameters
Supply Input
Supply Voltage
Supply Current
V
DD
I
SS
V
REG
(Typ)
+0.3V
—
—
—
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
Regulated Charge Voltage
V
START
V
STOP
V
HYS
V
START
V
STOP
V
HYS
V
REG
3.35
3.25
—
4.1
4.0
—
4.179
4.328
4.378
4.477
Regulated Charge Voltage Tolerance
Line Regulation
Load Regulation
Supply Ripple Attenuation
V
RTOL
|(ΔV
BAT
/
V
BAT
)/ΔV
DD
|
|ΔV
BAT
/V
BAT
|
PSRR
-0.5
—
—
—
—
—
Current Regulation (Fast Charge Constant-Current Mode)
AC-adapter Fast Charge Current
I
REG
95
900
Note 1:
2:
3:
4:
105
1000
115
1100
mA
mA
PROG1 = 10 kΩ
PROG1 = 1 kΩ,
Note 2
T
A
=-5°C to +55°C
—
1900
110
75
0.6
3.45
3.35
75
4.15
4.1
55
4.20
4.35
4.40
4.50
—
0.075
0.150
60
52
23
6
3000
300
100
5
3.55
3.45
—
4.3
4.2
—
4.221
4.372
4.422
4.523
+0.5
0.2
0.3
—
—
—
V
µA
µA
µA
µA
V
V
mV
V
V
mV
V
V
V
V
%
%/V
%
dB
dB
dB
T
A
=-5°C to +55°C
V
DD
=[V
REG
(typical)+1V] to 6V
I
OUT
=30 mA
I
OUT
=10 mA to 100 mA
V
DD
=[V
REG
(typical)+1V]
I
OUT
=10 mA, 10Hz to 1 kHz
I
OUT
=10 mA, 10Hz to 10 kHz
I
OUT
=10 mA, 10Hz to 1 MHz
Note 1
Charging
Charge Complete, No Battery
Standby (PROG Floating)
Shutdown (V
DD
< V
BAT
-
100 mV or V
DD
< V
STOP
)
V
DD
= Low to High (USB-port)
V
DD
= High to Low (USB-port)
(USB-port)
(AC-adapter)
(AC-adapter)
(AC-adapter)
V
DD
=[V
REG
(typical)+1V]
I
OUT
=30 mA
T
A
=-5°C to +55°C
Sym
Min
Typ
Max
Units
Conditions
Voltage Regulation (Constant Voltage Mode)
The supply voltage (V
DD
) = V
AC
when input power source is from AC-adapter and the supply voltage (V
DD
) = V
USB
when input power source is from USB-port.
The value is guaranteed by design and not production tested.
The current is based on the ratio of selected current regulation (I
REG
).
The maximum charge impedance has to be less than shutdown impedance for normal operation.
DS22071B-page 4
©
2007-2011 Microchip Technology Inc.
MCP73837/8
DC CHARACTERISTICS (Continued)
Electrical Specifications:
Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typical) + 0.3V] to 6V,
T
A
= -40°C to +85°C. Typical values are at +25°C, V
DD
= [V
REG
(typical) + 1.0V]
Parameters
USB-port Fast Charge Current
Sym
I
REG
Min
80
400
Maximum Output Current Limit
Precondition Current Ratio
I
MAX
I
PREG
/ I
REG
—
7.5
15
30
Precondition Current Threshold Ratio
Precondition Hysteresis
Charge Termination
Charge Termination Current Ratio
I
TERM
/ I
REG
3.75
5.6
7.5
15
Automatic Recharge
Recharge Voltage Threshold Ratio
Pass Transistor ON-Resistance
ON-Resistance
Battery Discharge Current
Output Reverse Leakage Current
I
DISCHARGE
—
—
—
Status Indicators - STAT1, STAT2, PG (MCP73837)
Sink Current
Low Output Voltage
Input Leakage Current
PROG1 Input (PROG1)
Charge Impedance Range
Shutdown Impedance
PROG2 Inputs (PROG2)
Input High Voltage Level
Input Low Voltage Level
Shutdown Voltage Level
Input Leakage Current
Note 1:
2:
3:
4:
V
IH
V
IL
V
SD
I
LK
0.8V
DD
—
0.2V
DD
—
—
—
—
7
—
0.2V
DD
0.8V
DD
15
%
%
%
µA
V
PROG2
= V
DD
R
PROG
R
PROG
1
70
—
—
—
200
kΩ
kΩ
Note 4
Minimum Impedance for
Shutdown
I
SINK
V
OL
I
LK
—
—
—
16
0.3
0.03
35
1
1
mA
V
µA
I
SINK
= 4 mA
High Impedance, V
DD
on pin
0.1
0.55
-6
2
2
-15
µA
µA
µA
Standby (PROG1 or PROG2
Floating)
Shutdown (V
DD
< V
BAT
-
100 mV or V
DD
< V
STOP
)
Charge Complete
R
DSON
—
350
—
mΩ
V
DD
= 4.5V, T
J
= 105°C
V
RTH
/ V
REG
92
95
94.0
97
96
99
%
%
V
BAT
High to Low
T
A
=-5°C to +55°C
5
7.5
10
20
6.25
9.4
12.5
25
%
%
%
%
PROG1 = 1 kΩ to 10 kΩ
T
A
=-5°C to +55°C
Note 3
V
PTH
/ V
REG
V
PHYS
64
69
—
Typ
90
450
1200
10
20
40
100
66.5
71.5
120
69
74
—
Max
100
500
—
12.5
25
50
Units
mA
mA
mA
%
%
%
%
%
%
mV
V
BAT
High to Low
V
BAT
Low to High
Conditions
PROG2 = Low
PROG2 = High
T
A
=-5°C to +55°C
PROG1 < 833Ω
Note 3
T
A
=-5°C to +55°C
Precondition Current Regulation (Trickle Charge Constant-Current Mode)
The supply voltage (V
DD
) = V
AC
when input power source is from AC-adapter and the supply voltage (V
DD
) = V
USB
when input power source is from USB-port.
The value is guaranteed by design and not production tested.
The current is based on the ratio of selected current regulation (I
REG
).
The maximum charge impedance has to be less than shutdown impedance for normal operation.
©
2007-2011 Microchip Technology Inc.
DS22071B-page 5
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