TPS54325-Q1 Datasheet, PDF (4/18 Pages) Texas Instruments – 4.5-V to 18-V, 3-A OUTPUT SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT™)

TPS54325-Q1
SLVSAT1 – JUNE 2011
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
ON-TIME TIMER CONTROL
T_ON
On time
T_OFF(MIN) Minimum off time
SOFT START
V_IN = 12 V, V_O = 1.05 V
T_A = 25°C, V_FB = 0.7 V
I_SSC
SS charge current
V_SS = 0 V
1.4
I_SSD
SS discharge current
V_SS = 0.5 V
0.1
POWER GOOD
V_THPG
PG threshold
V_FB rising (good)
V_FB falling (fault)
85
I_PG
PG sink current
PG = 0.5 V
2.5
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
V_OVP
Output OVP trip threshold
OVP detect
115
T_OVPDEL Output OVP prop delay
UVP detect
65
V_UVP
Output UVP trip threshold
Hysteresis
T_UVPDEL
T_UVPEN
UVLO
Output UVP delay
Output UVP enable delay
Relative to soft-start time
V_UVLO
UVLO threshold
Wake up V_REG5 voltage
Hysteresis V_REG5 voltage
3.45
0.15
DEVICE INFORMATION
PWP PACKAGE
(TOP VIEW)
VO 1
14 VCC
VFB 2
13 VIN
VREG5 3
SS 4
GND 5
POWERPAD
TPS54325
PWP
HTSSOP14
12 VBST
11 SW2
10 SW1
PG 6
9 PGND2
EN 7
8 PGND1
TYP
145
260
2.0
0.2
90
85
5
120
5
70
10
0.25
x 1.7
3.70
0.25
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MAX UNIT
ns
ns
2.6
μA
mA
95
%
mA
125
%
μs
75
%
ms
3.95
V
0.35
NAME
VO
VFB
VREG5
SS
GND
TERMINAL
NO.
1
2
3
4
5
4
TERMINAL FUNCTIONS
DESCRIPTION
Connect to output of converter. This terminal is used for On-Time Adjustment.
Converter feedback input. Connect with feedback resistor divider.
5.5 V power supply output. A capacitor (typical 1μF) should be connected to GND.
Soft-start control. A external capacitor should be connected to GND.
Signal ground pin
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