0

10

20

30

40

50

60

1.7

1.9

2.1

2.3

2.5

2.7

2.9

3.1

3.3

Input Voltage (V)

G000

0

10

20

30

40

50

60

70

80

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Output Current (A)

CSD17308Q2

CSD16301Q2

G000

bq500211

SLUSAO2 – JUNE 2012

www.ti.com

PIN FUNCTIONS (continued)

PIN

I/O

DESCRIPTION

NO.

NAME

19

PMB_ALERT

O

Reserved, leave this pin open.

10

PMB_CLK

I/O

10-k

Ω pull-up resistor to 3.3-V supply.

20

PMB_CTRL

I

Reserved, connect to GND.

11

PMB_DATA

I/O

10-k

Ω pull-up resistor to 3.3-V supply.

48

REFIN

I

External Reference Voltage Input. Connect this input to GND.

27

RESERVED

I/O

Reserved, leave this pin open.

28

RESERVED

I/O

Reserved, leave this pin open.

29

RESERVED

I/O

Reserved, leave this pin open.

30

RESERVED

I/O

Reserved, leave this pin open.

31

RESERVED

I/O

Reserved, connect 10-k

Ω pull-down resistor to GND.

41

RESERVED

O

Reserved, leave this pin open.

43

RESERVED

I

Reserved, leave this pin open.

5

RESET

I

Device reset. Use a 10-k

Ω to 100-kΩ pull-up resistor to the 3.3-V supply.

6

SLEEP

O

Low-power mode output. Starts low-power ping cycle.

2

Sensor Input. Device shuts down when below 1 V. If not used, keep above 1 V by

T_SENSE

I

connecting to the 3.3-V supply.

46

I

Transmitter input voltage, used for efficiency calculations. Use 76.8-k

Ω to 10-kΩ divider to

V_SENSE

minimize quiescent current.

34

—

Analog 3.3-V Supply. This pin can be derived from V33D supply, decouple with 10-

Ω resistor

V33A

and additional bypass capacitors

33

—

Digital core 3.3-V supply. Be sure to decouple with bypass capacitors as close to the part as

V33D

possible.

Typical Characteristics Curves

Figure 1. bq500211 Supply Current vs. VCC Voltage

Figure 2. System Efficiency Using Alternate MOSFETs

8

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