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TPS40322 Datasheet(PDF) 4 Page - Texas Instruments

Part # TPS40322
Description  Dual Output or Two-Phase Synchronous Buck Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40322 Datasheet(HTML) 4 Page - Texas Instruments

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SYNC
RT
EN1/SS1
FB1
COMP1
AGND
COMP2
FB2
TPS40322RHB
HDRV1
SW1
LDRV1
PGND1
BP6
PGND2
LDRV2
SW2
TPS40322
SLUSAF8E – JULY 2011 – REVISED JANUARY 2016
www.ti.com
5 Pin Configuration and Functions
RHB Package
32-Pin VQFN
Top View
NOTE: In two-phase mode, the EN2/SS2/GSNS pin becomes the GSNS pin and the ILIM2/VSNS pin becomes the VSNS
pin.
The two channels are identical unless specified otherwise.
The following naming conventions are used to better describe the functions. For example, COMPx refers to COMP1
and COMP2, FBx refers to FB1 and FB2.
Pin Functions
PIN
I/O
DESCRIPTION
NAME
PIN
AGND
6
Low noise ground connection to the controller.
BOOT1 provides a bootstrapped supply for the high-side FET driver for channel 1 (CH1). Connect a
BOOT1
25
I
capacitor (0.1
μF typical) from BOOT1 to SW1 pin.
BOOT2 provides a bootstrapped supply for the high-side FET driver for channel 2 (CH2). Connect a
BOOT2
15
I
capacitor (0.1
μF typical) from BOOT2 to SW2 pin.
Output bypass for the internal regulator. Connect a low ESR bypass ceramic capacitor with a value of
BP6
20
O
3.3
μF or greater from this pin to the power ground plane.
COMP1
5
O
Output of the error amplifier 1 and connection node for loop feedback components.
COMP2
7
O
Output of the error amplifier 2 and connection node for loop feedback components.
CS1–
29
I
Negative terminal of current sense amplifier for CH1
CS1+
28
I
Positive terminal of current sense amplifier for CH1
CS2–
12
I
Negative terminal of current sense amplifier for CH2
CS2+
13
I
Positive terminal of current sense amplifier for CH2
Output of the differential amplifier. When the device is configured for dual channel mode, the DIFFO pin
DIFFO
9
O
must be either floating or tied to BP6
Logic level input which starts or stops CH1. Letting this pin float turns CH1 on. Pulling this pin low disables
CH1. This is also the soft-start programming pin. A capacitor connected from this pin to AGND programs
EN1/SS1
3
I
the soft-start time. The capacitor is charged with an internal current source of 10
μA. The resulting voltage
ramp of this pin is also used as a second non-inverting input to the error amplifier 1 after a 0.8 V (typical)
level shift downwards.
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Copyright © 2011–2016, Texas Instruments Incorporated
Product Folder Links: TPS40322


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