ST PM6612 User Manual

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