TPS62590DRVR Datasheet, PDF (4/24 Pages) Texas Instruments – 1-A Step Down Converter in 2 x 2 QFN Package

TPS62590
SLVS897B – JANUARY 2009 – REVISED APRIL 2011
PIN ASSIGNMENTS
DRV PACKAGE
(TOP VIEW)
SW
MODE
FB
1
2
3
Power ^PAD
6
5
4
GND
VIN
EN
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TERMINAL
NAME
NO.
VIN
5
GND
6
EN
4
SW
1
FB
3
MODE
2
PwPd
( PowerPAD™)
TERMINAL FUNCTIONS
I/O
DESCRIPTION
PWR
PWR
I
OUT
I
I
VIN power supply pin.
GND supply pin
This is the enable pin of the device. Pulling this pin to low forces the device into shutdown mode.
Pulling this pin to high enables the device. This pin must be terminated.
This is the switch pin and is connected to the internal MOSFET switches. Connect the external
inductor between this terminal and the output capacitor.
Feedback Pin for the internal regulation loop. Connect the external resistor divider to this pin. In
case of fixed output voltage option, connect this pin directly to the output capacitor
MODE pin = high forces the device to operate in fixed-frequency PWM mode. Mode pin = low
enables the Power Save Mode with automatic transition from PFM mode to fixed-frequency PWM
mode.
Must be soldered to achieve appropriate power dissipation. Should be connected to GND.
FUNCTIONAL BLOCK DIAGRAM
VIN
EN
MODE
FB
Thermal
Shutdown
Softstart
VOUT RAMP
CONTROL
Reference
0.6 V VREF
Undervoltage
Lockout 1.8 V
PFM Comp
FB
VREF
VREF
Error Amp
Integrator
Zero-Pole
AMP.
MODE
PWM
Comp .
Control
Stage
Sawtooth
Generator
2.25 MHz
Oscillator
Current
Limit Comparator
VIN
High Side
Gate Driver
Anti
SW
Shoot-Through
Low Side
Current
Limit Comparator
GND
GND
4
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