TPS54531
SLVSBI5 –MAY 2013
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ELECTRICAL CHARACTERISTICS (continued)
TJ = –40°C to 150°C, VIN = 3.5V to 28V (unless otherwise noted)
DESCRIPTION
TEST CONDITIONS
MIN
TYP
165
2
MAX UNIT
THERMAL SHUTDOWN
Thermal Shutdown
SLOW START (SS PIN)
Charge current
°C
V(SS) = 0.4 V
μA
DEVICE INFORMATION
PIN ASSIGNMENTS
DDA PACKAGE
(TOP VIEW)
8
7
6
5
1
2
3
4
PH
BOOT
VIN
GND
PowerPADTM
(Pin 9)
EN
COMP
VSENSE
SS
PIN FUNCTIONS
PIN
DESCRIPTION
NAME
NO.
BOOT
1
A 0.1 μF bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor falls
below the minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is
refreshed.
VIN
EN
2
3
Input supply voltage, 3.5 V to 28 V.
Enable pin. Pull below 1.25V to disable. Float to enable. Programming the input undervoltage lockout with
two resistors is recommended.
SS
4
5
6
Slow start pin. An external capacitor connected to this pin sets the output rise time.
Inverting node of the gm error amplifier.
VSENSE
COMP
Error amplifier output, and input to the PWM comparator. Connect frequency compensation components
to this pin.
GND
7
8
9
Ground.
PH
The source of the internal high-side power MOSFET.
PowerPAD™
GND pin must be connected to the exposed pad for proper operation. This pin is only available in the
DDA package.
4
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