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TPS62403 Datasheet(PDF) 5 Page - Texas Instruments

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Part No. TPS62403
Description  2.25MHz 400mA/600mA Dual Step-Down Converter In Small 3x3mm QFN Package
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TPS62403 Datasheet(HTML) 5 Page - Texas Instruments

 
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PIN ASSIGNMENTS
DEF_1
FB1
MODE/DATA
VIN
EN1
SW2
ADJ2
GND
EN2
Po
w
er
PA
D
SW1
1
2
3
4
5
10
9
8
7
6
TopviewDRCpackage
TPS62400
,, TPS62401
TPS62403
SLVS681C – JUNE 2006 – REVISED DECEMBER 2006
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NO.
NAME
(QFN)
ADJ2
1
I
Input to adjust output voltage of converter 2. In adjustable version (TPS62400) connect a external
resistor divider between VOUT2, this pin and GND to set output voltage between 0.6V and VIN. At fixed
output voltage version (TPS62401) this pin MUST be directly connected to the output. If EasyScale
Interface is used for converter 2, this pin must be directly connected to the output, too.
MODE/DATA
2
I/0
This Pin has 2 functions:
1. Operation Mode selection: With low level, Power Save Mode is enabled where the device operates
in PFM mode at light loads and enters automatically PWM mode at heavy loads. Pulling this PIN to
high forces the device to operate in PWM mode over the whole load range.
2. EasyScale™ Interface function: One wire serial interface to change the output voltage of both
converters. The pin has an open drain output to provide an acknowledge condition if requested.
The current into the open drain output stage may not exceed 500
µA. The interface is active if either
EN1 or EN2 is high.
VIN
3
Supply voltage, connect to VBAT, 2.5V to 6V
FB1
4
I
Direct feedback voltage sense input of converter 1, connect directly to Vout 1. An internal feed forward
capacitor is connected between this pin and the error amplifier. In case of fixed output voltage versions
or when the Interface is used, this pin is connected to an internal resistor divider network.
DEF_1
5
I
This pin defines the output voltage of converter 1. The pin acts either as analog input for output voltage
setting via external resistors (TPS62400), or digital input to select between two fixed default output
voltages (TPS62401).
For the TPS62400, an external resistor network needs to be connected to this pin to adjust the default
output voltage.
Using the fixed output voltage device option TPS62401 this pin selects between two fixed default output
voltages:
High = 1.1V, Low = 1.575V.
SW1
6
I/O
Switch Pin of Converter1. Connect to Inductor
EN1
7
I
Enable Input for Converter1, active high
GND
8
GND for both converters; connect this pin to the PowerPAD™
EN2
9
I
Enable Input for Converter 2, active high
SW2
10
I/O
Switch Pin of Converter 2. Connect to Inductor.
PowerPAD™
Connect to GND
5
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