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PDF VA7208 Data sheet ( Hoja de datos )
| Número de pieza | VA7208 | |
| Descripción | Advanced Linear Charger IC | |
| Fabricantes | Vimicro | |
| Logotipo |  |
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VA7208
Advanced Linear Charger IC
for Lithium-ion and Lithium-polymer Battery
FEATURES
4.5V to 12V input voltage range
Ideal for single (4.2V) Li-ion or Li-polymer battery
packs
Better than ±1% voltage regulation accuracy
Adjustable charge current during constant current
charge
Constant voltage charge
Automatic battery recharge
Charge status output with LED
Charge termination by minimum current
Battery Short Indication
Automatic low-power sleep mode when VCC is
removed or when the voltage supply is lower than
the battery voltage
Few external components
Small package: 8-pin SOP or 8-pin MSOP
APPLICATIONS
Handheld devices
Cellular phones
PDAs
DESCRIPTION
VA7208 is an advanced Lithium-Ion and
Lithium-Polymer linear charger IC designed for
cost-sensitive and compact portable electronics. It
combines high-accuracy current, voltage regulation,
charge termination, and charge status indication in a
single 8-pin IC. It is the best suitable device to be
used in PDA, mobile phone, and other portable
devices.
VA7208 monitors the battery charging status by
detecting the battery voltage. VA7208 charges the
battery in three phases: conditioning, constant current
and constant voltage.
If the battery voltage (VBAT) is below the
preconditioning voltage threshold (VMIN), VA7208
precharges the battery using a low current. When
the battery voltage reaches VMIN, VA7208 applies a
constant current to charge the battery. An external
sense resistor controls the current. The constant
current charging continues until the battery voltage
reaches the voltage regulation threshold (VREG). And
then VA7208 enters the constant voltage charging
phase. The accuracy of the voltage regulation is better
than ±1% over the operating temperature and supply
voltage range. Under the condition, the charging
current gradually decreases. Charge stops when the
current tapers to the charge termination threshold,
ITERM. VA7208 monitors the battery voltage
continuously and enters a new cycle of charging if the
battery’s voltage falls below the recharge voltage
threshold (VRECHG).
VA7208 is available in a small 8-pin SOP package or
8-pin MSOP package.
FUNCTINAL BLOCK DIAGRAM
Datasheet (V1.4)
Figure 1 Functional Block Diagram
Copyright © vimicro, Inc. 1999-2009 www.micro-bridge.com
1
1 page  
VA7208
Figure 4 Typical Charge Profile
Power Supply
C1=10μF
R1=0.3Ω
R4=1KΩ
CS
Green
LEDT
R2=330Ω
VCC
D1
IN5819
Q1 SPP9435B(SOP-8)
SPP3095(TO-252)
micro-bridge
DRIVE
BAT+
BAT
C2=10μF
VA7208
Red LEDS
R3=330Ω
EN
VSS
Figure 5 Li-ion and Li-Polymer Charger Using a PMOS
Datasheet (V1.4)
Copyright © vimicro, Inc. 1999-2009
www.micro-bridge.com
5
5 Page 
VA7208
Datasheet (V1.4)
Figure 8 VA7208 8-Pin MSOP Package
[Table 5] Physical dimensions in figure 8 (Unit:mm)
SYMBOL
MIN
MAX
A 2.950
3.050
A1 2.890
2.990
b 0.300 (TYP)
c 0.152 (TYP)
c1 0.800
0.900
c2 0.324
0.374
C 0.250 (TYP)
D Φ0.650 (TYP)
e 0.500 (TYP)
E1 4.800
5.000
F 0.050
0.150
F1 0.750 (TYP)
F2 0.750 (TYP)
L1 2.950
3.050
L2 2.890
2.990
W1 0.523
0.623
W2 0.200
0.250
Copyright © vimicro, Inc. 1999-2009
www.micro-bridge.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet VA7208.PDF ] | |
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