3. TECHNICAL BRIEF
3.16 Charging circuit
ISL9221 accepts two power inputs, normally one from a USB (Universal Serial Bus) port and the other from a desktop cradle.
The ISL9221 features 28V and 7V maximum voltages for the cradle and the USB inputs respectively. Due to the 28V rating for the cradle input,
An over voltage protection functions are integrated in ISL9221 for USB & Charge
CHARGING IC OVP
VBAT VCHG_OVP VBUS_OVP
2V0_VRTC 2V62_VIO VBUS_USB VCHG
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| U201 | ISL9221 |
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R226 | DNI | R209 | 100K |
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| 1 |
| PGND | 13 |
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| VDC | VDC_BYP | 12 |
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| 2 | VUSB |
| 11 |
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| 3 |
| BAT |
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| _PPR |
| 10 |
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| 4 |
| USB_BYP |
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EOC |
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| _CHG |
| 9 |
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| 5 |
| IVDC |
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CHG_EN |
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| _EN |
| 8 |
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| 6 |
| GND |
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| IMIN |
| 7 |
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| (1608,25V,K,X5R) |
| (1608,25V,K,X5R) |
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| IUSB |
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| R215 | 100K | 1u | 1u | 10K | R213 |
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| R216 | 33K | ||
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| C209 |
| C210 |
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16K | R214 | (1005,10V,K,X5R) |
(1%)
C211
1u
(1005,10V,K,X5R)
C212
1u
(1005,10V,K,X5R)
C213
1u
Figure 19. Charging Circuit Diagram
Copyright © 2008 LG Electronics. Inc. All right reserved. | - 49 - | LGE Internal Use Only |
Only for training and service purposes |
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