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PDF MCP73838 Data sheet ( Hoja de datos )
| Número de pieza | MCP73838 | |
| Descripción | (MCP73837 / MCP73838) Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge Management Controller | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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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 accommodated 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 Microchip Technology Inc.
DS22071A-page 1
1 page  
www.datasheet4u.com
MCP73837/8
DC CHARACTERISTICS (Continued)
Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(typical) + 0.3V] to 6V,
TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typical) + 1.0V]
Parameters
Sym
Min Typ Max Units
Conditions
USB-Port Fast Charge Current
IREG
80 90
400 450
Maximum Output Current Limit
IMAX
— 1200
Precondition Current Regulation (Trickle Charge Constant-Current Mode)
100
500
—
mA PROG2 = Low
mA PROG2 = High
TA=-5°C to +55°C
mA PROG1 < 833Ω
Precondition Current Ratio
IPREG / IREG
7.5
15
30
10 12.5 % Note 3
20 25 % TA=-5°C to +55°C
40 50 %
100 %
Precondition Current Threshold Ratio VPTH / VREG
64
69
66.5 69 % VBAT Low to High
71.5 74 %
Precondition Hysteresis
Charge Termination
VPHYS
— 120 — mV VBAT High to Low
Charge Termination Current Ratio
ITERM / IREG
3.75
5.6
7.5
5 6.25 % PROG1 = 1 kΩ to 10 kΩ
7.5 9.4 % TA=-5°C to +55°C
10 12.5 % Note 3
15 20 25 %
Automatic Recharge
Recharge Voltage Threshold Ratio
Pass Transistor ON-Resistance
VRTH / VREG
92
95
94.0 96 % VBAT High to Low
97 99 % TA=-5°C to +55°C
ON-Resistance
Battery Discharge Current
RDSON
— 350 — mΩ VDD = 4.5V, TJ = 105°C
Output Reverse Leakage Current
IDISCHARGE
—
0.1 2 µA Standby (PROG1 or PROG2
Floating)
—
0.55
2 µA Shutdown (VDD < VBAT -
100 mV or VDD < VSTOP)
— -6 -15 µA Charge Complete
Status Indicators - STAT1, STAT2, PG (MCP73837)
Sink Current
Low Output Voltage
Input Leakage Current
PROG1 Input (PROG1)
ISINK
VOL
ILK
— 16 35 mA
— 0.3 1 V ISINK = 4 mA
—
0.03
1 µA High Impedance, VDD on pin
Charge Impedance Range
Shutdown Impedance
RPROG 1 — — kΩ Note 4
RPROG 70 — 200 kΩ Minimum Impedance for
Shutdown
PROG2 Inputs (PROG2)
Input High Voltage Level
VIH
0.8VDD
—
—%
Input Low Voltage Level
VIL
—
—
0.2VDD
%
Shutdown Voltage Level
VSD
0.2VDD
—
0.8VDD
%
Input Leakage Current
ILK — 7 15 µA VPROG2 = VDD
Note 1: The supply voltage (VDD) = VAC when input power source is from Ac-Adapter and the supply voltage (VDD) = VUSB
when input power source is from USB-Port.
2: The value is guaranteed by design and not production tested.
3: The current is based on the ratio of selected current regulation (IREG).
4: The maximum charge impedance has to be less than shutdown impedance for normal operation.
© 2007 Microchip Technology Inc.
DS22071A-page 5
5 Page 
www.datasheet4u.com
MCP73837/8
Note: Unless otherwise indicated, VDD = [VREG(typical) + 1V], IOUT = 30 mA and TA= +25°C, Constant-voltage mode.
16
14
12
10
8
6
4
2 IOUT = 100 mA
0
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
FIGURE 2-19:
Time (µs)
Line Transient Response.
1 0.1
0.9
0.8
0.7
IOUT = 100 mA
0.05
0
0.6 -0.05
0.5
0.4
-0.1
0.3 -0.15
0.2
0.1
0
-0.2
-0.25
-0.1 -0.3
Time (Minutes)
FIGURE 2-22:
Load Transient Response.
16
14
12
10
8
6
4
2 IOUT = 10 mA
0
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
FIGURE 2-20:
Time (µs)
Line Transient Response.
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
-0.05
IOUT = 10 mA
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
-0.12
FIGURE 2-23:
(IOUT = 1A).
VAC UVLO Start Delay
FIGURE 2-21:
Time (Minutes)
Load Transient Response.
FIGURE 2-24:
(USB = Low).
VUSB UVLO Start Delay
© 2007 Microchip Technology Inc.
DS22071A-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP73838.PDF ] | |
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