Datasheet

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.
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