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 short-
circuit 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
PM6612
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
LiFePO
available in a compact QFN20L 3x3 mm,
package.
Table 1. Device summary
cells, for mobile PC applications. It is
4
Order code Package Packing
PM6612 QFN3x3 20L Tape and reel
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
8
Typical application circuit PM6612
1 Typical application circuit
Figure 1. Typical application circuit
GND
BYP
BYP
ACOK
IOUT
ILIM
ILIM
ALARM
SCL
ADP
C1
R1
+5V
GND
+5V
SDA
ADP
RADU
RADL
ILIM
QILIM
+5V
RILL
RILU
ACOK
16
IOUT
17
ALARM
18
SCL
19
SDA
20
THP
21
15
ILIM
PH1HIGH
ACDI V
14
2
R2
ACFET
ACDI V
BYP
QBYP
RB2B
13
12
B2B
U1
PM6612
BTST3LOW4GND
RAC
ACDRV
RBFET
11
ACP
ACN
BATFET
SRN
SRP
DCIN
5
RSA
SYS
10
9
8
7
6
CDC
DCIN
CSRN
BTST
RHS
CBT
SDA
SCL
ALARM
ACOK
IOUT
BATT
SYS
BATT
SYS
GND
SYS
SYS
CIN2
CIN1
BATFET
PHASE
HS
L1
RSB
BATT
C9
RB
RDC
D1
RLS
LS
COUT2
COUT1
BATTERY
CBT1
+5V
SRP
SRN
AM10243v1
2/8 Doc ID 022740 Rev 1
PM6612 Device pinout
2 Device pinout
Figure 2. PM6612 pinout
1
2
3
4
5
PH
HIGH
BTST
LOW
GND
20
SDA
DCIN
6
18
17
IOUT
19
SCL
ALARM #
PM6612
SRP7SRN8BAT FET9ACN
16
ACOK
ILIM
ACD IV
B2B
ACD RV
ACP
10
15
14
13
12
11
AM10244v1
Doc ID 022740 Rev 1 3/8
Package mechanical data PM6612
3 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com. ECOPACK
is an ST trademark.
®
packages, depending on their level of environmental compliance. ECOPACK
4/8 Doc ID 022740 Rev 1
PM6612 Package mechanical data
Table 2. QFN3x3 20L mechanical data
mm.
Dim.
Min. Typ. Max.
A 0.80 0.90 1.00
A1 0.02 0.05
A2 0.65 1.00
A3 0.20
b 0.15 0.20 0.25
D 2.85 3.00 3.15
D1 1.60
D2 1.50 1.60 1.70
E 2.85 3.00 3.15
E1 1.60
E2 1.50 1.60 1.70
e 0.35 0.40 0.45
L 0.30 0.40 0.50
ddd 0.07
Doc ID 022740 Rev 1 5/8
Package mechanical data PM6612
Figure 3. QFN3x3 20L mechanical data drawing
6/8 Doc ID 022740 Rev 1
?2%6?!
PM6612 Revision history
4 Revision history
Table 3. Document revision history
Date Revision Changes
09-Feb-2012 1 Initial release.
Doc ID 022740 Rev 1 7/8
PM6612
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