ST PM6612 User Manual
PM6612
2 to 4-cell Li-Ion, Li-FePO4 battery charger with SMBus interface, N-channel RBFET and BATFET MOSFET selectors
Features
■Buck converter
–Synchronous buck converter with N-channel high-side, low-side power MOSFET integrated drivers
–350 kHz or 700 kHz switching frequency, selectable with SMBus
–AC adapter input voltage range 9 V - 24 V
–5 V bias input voltage supply
–Battery charge voltage range 2.5 V -18 V
–±0.5% charge voltage accuracy
–0.1% cell charge voltage resolution
–±3% charge current accuracy
–±3% input current accuracy
–Overvoltage, overcurrent protection
–Battery, inductor, power MOSFET shortcircuit protection
–Internal loop compensation network
–Integrated soft-start
■Selector
–N-channel BATFET MOSFET driver
–N-channel RBFET MOSFET driver
■System
–1 mA quiescent supply current
–17 µA - 35 µA sleep mode current (BATFET charge pump off - on)
–Thermal shutdown
Applications
■Mobile PC:
–UMPC/MID and tablets
–Netbook and notebook computers
Description
Data brief
QFN3x3 20L
a synchronous switching DC-DC converter with N-channel high-side and low-side Power MOSFET drivers. The possibility to set the switching frequency with SMBus by choosing one of the two preset values of 350 kHz or 700 kHz assures the best trade-off between power conversion efficiency and PCB cost and size.
Integrated loop compensation network and softstart allow the reduction of the number of external components.
The PM6612 integrates 2 charge pumps to drive N-channel BATFET and RBFET MOSFETs.
The SMBus communication interface is used to set the battery charge current and voltage.
The PM6612 charges 2 to 4-series Li-Ion or LiFePO4 cells, for mobile PC applications. It is available in a compact QFN20L 3x3 mm, package.
Table 1. |
Device summary |
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Order code |
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Packing |
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PM6612 |
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QFN3x3 20L |
Tape and reel |
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The PM6612 is a high efficiency battery charger with SMBus communication interface. It includes
February 2012 |
Doc ID 022740 Rev 1 |
1/8 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
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Typical application circuit |
PM6612 |
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1 Typical application circuit
Figure 1. Typical application circuit
ADP |
GND |
BYP |
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C1 |
QBYP |
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R2 |
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R1 |
ACFET |
BYP |
ILIM |
+5V |
GND |
ADP |
BYP |
ILIM |
+5V |
RADU |
RADL |
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ILIM QILIM |
+5V |
RILU |
RILL |
ACOK |
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IOUT |
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ALARM |
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SCL |
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SDA |
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ACOK |
IOUT |
ALARM |
SCL |
SDA |
GND |
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BATT |
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BATT |
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SYS |
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ACDIV |
RB2B |
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ILIM |
ACDIV |
B2B |
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ACOK |
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IOUT |
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U1 |
PM6612 |
ALARM |
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SCL |
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SDA |
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HIGH |
BTST |
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THP |
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BTST |
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RHS |
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CBT |
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HS |
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PHASE |
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L1 |
CIN1 CIN2
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RSB |
BATFET |
BATT |
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C9 |
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RB |
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RBFET |
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RSA |
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RAC |
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SYS |
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ACDRV |
ACP |
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ACN |
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BATFET |
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SRN |
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CSRN |
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SRP |
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LOW |
DCIN |
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DCIN |
CDC |
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5 |
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RDC |
CBT1 |
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D1 |
+5V |
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RLS |
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LS |
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COUT2 |
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COUT1 |
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SRP |
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SRN |
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BATTERY |
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AM10243v1
2/8 |
Doc ID 022740 Rev 1 |
PM6612 |
Device pinout |
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2 Device pinout
Figure 2. PM6612 pinout
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18 |
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17 |
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PH |
SDA |
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SCL |
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ALARM# |
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IOUT |
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ACOK |
ILIM |
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HIGH |
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ACDIV |
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BTST |
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PM6612 |
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B2B |
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LOW |
DCIN |
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SRP |
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SRN |
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BATFET |
ACDRV |
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GND |
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ACN |
ACP |
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AM10244v1
Doc ID 022740 Rev 1 |
3/8 |
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