SM72295

IOUT

OVP

PGOOD

SOA

SIB

OVS

HSB

HBB

LIA

HIA

LOB

AGND

LIB

HIB

BOUT

SOB

BIN

SIA

HOB

VCCB

VDD

HSA

PGND

HOA

HBA

VCCA

LOA

IIN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

15

16

SM72295

SNVS688E – OCTOBER 2010 – REVISED APRIL 2013

www.ti.com

Connection Diagram

Figure 1. Top View

SOIC-28

PIN DESCRIPTIONS

Pin

Name

Description

Application Information

1

SIA

Sense high input for input current

Tie to positive side of the current sense resistor through an external gain

sense transconductance amplifier

programming resistor (RI). Amplifier transconductance is 1/RI.

2

S0A

Sense low input for input current

Tie to negative side of the current sense resistor through an external gain

sense transconductance amplifier

programming resistor. Amplifier transconductance is 1/RI.

3

IIN

Output for current sense

Output of the input current sense amplifier. Requires an external resistor to

transconductance amplifier

ground (RL). Gain is RL/RI, where RI is the external resistor in series with the

SIA pin.

4

BIN

Buffered IIN

Buffered IIN.

5

AGND

Analog ground

Ground return for the analog circuitry. Tie to the ground plane under the IC

6, 9

LIA, LIB

Low side driver control input

The inputs have TTL type thresholds. Unused inputs should be tied to ground

and not left open.

7, 8

HIA, HIB

High side driver control input

The inputs have TTL type thresholds. Unused inputs should be tied to ground

and not left open.

10

PGOOD

Power good indicator output

Open drain output with an internal pull-up resistor to VDD indicating VCC is in

regulation. PGOOD low implies VCC is out of regulation.

11

BOUT

Buffered IOUT

Buffered IOUT.

12

IOUT

Output for current sense

Output of the output current sense amplifier. Requires an external resistor to

comparator.

ground (RL). Gain is RL/RI, where RI is the external resistor in series with the

SIB pin.

13

S0B

Sense low input for output current

Tie to negative side of the current sense resistor through an external gain

sense amplifier

programming resistor. Amplifier transconductance is 1/RI.

14

SIB

Sense high input for output current

Tie to positive side of the current sense resistor through an external gain

sense amplifier

programming resistor (RI). Amplifier transconductance is 1/RI.

15

OVP

Over voltage indicator output

Open drain output with an internal pull-up resistor to VDD indicating OVS >VDD.

OVP is low when OVS>VDD.

16

OVS

Sense input for over voltage

Requires an external resistor divider. VDD is the reference voltage.

17

VDD

3.3V or 5V regulator output

Bypass with 0.1uF. Reference for over voltage shutdown and IOUT/IIN clamp

18, 28

HSA,

High side MOSFET source

Connect to bootstrap capacitor negative terminal and the source of the high side

HSB

connection

MOSFET.

2

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