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TPS54228 Datasheet(PDF) 5 Page - Texas Instruments

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Part # TPS54228
Description  4.5-V to 18-V Input, 2-A Synchronous Step-Down Converter With Eco-Mode
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54228 Datasheet(HTML) 5 Page - Texas Instruments

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5
TPS54228
www.ti.com
SLVSAU1E – MAY 2011 – REVISED AUGUST 2016
Product Folder Links: TPS54228
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Copyright © 2011–2016, Texas Instruments Incorporated
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.4 Thermal Information
THERMAL METRIC(1)
TPS54228
UNITS
DDA (SO)
D (SOIC)
DRC (VSON)
8 PINS
8 PINS
10 PINS
RθJA
Junction-to-ambient thermal resistance
45.3
114.4
43.9
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
54.8
60.8
55.4
°C/W
RθJB
Junction-to-board thermal resistance
16.2
55.7
18.9
°C/W
ψJT
Junction-to-top characterization parameter
6.6
17.4
0.7
°C/W
ψJB
Junction-to-board characterization parameter
16
55.1
19.1
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
8.5
5.3
°C/W
(1)
Not production tested.
6.5 Electrical Characteristics
over operating free-air temperature range and VIN = 12 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY CURRENT
IVIN
Operating, non-switching supply current
VIN current, TA = 25°C, EN = 5 V,
VFB = 0.8 V
800
1200
µA
IVINSDN
Shutdown supply current
VIN current, TA = 25°C, EN = 0 V
5
10
µA
LOGIC THRESHOLD
VEN
EN high-level input voltage
EN
1.6
V
EN low-level input voltage
EN
0.6
V
REN
EN pin resistance to GND
VEN = 12 V
220
440
880
VFB VOLTAGE AND DISCHARGE RESISTANCE
VFBTH
VFB threshold voltage
TA = 25°C, VO = 1.05 V, IO = 10 mA,
Eco-Mode™ operation
770
mV
TA = 25°C, VO = 1.05 V,
continuous mode operation
749
765
781
mV
IVFB
VFB input current
VFB = 0.8 V, TA = 25°C
0
±0.1
µA
VREG5 OUTPUT
VVREG5
VREG5 output voltage
TA = 25°C, 6 V < VIN < 18 V,
0 < IVREG5 < 5 mA
5.2
5.5
5.7
V
VLN5
Line regulation
6 V < VIN < 18 V, IVREG5 = 5 mA
25
mV
VLD5
Load regulation
0 mA < IVREG5 < 5 mA
100
mV
IVREG5
Output current
VIN = 6 V, VREG5 = 4 V, TA = 25°C
60
mA
MOSFET
RDS(on)
High side switch resistance
DDA and D packages 25°C, VBST – SW = 5.5 V
155
DRC package, 25°C, VBST – SW = 5.5 V
165
Low side switch resistance
25°C
108
Iocl
Current limit
DDA and DRC packages, L out = 2.2 µH(1)
2.5
3.3
4.7
A
D package, L out = 2.2 µH(1)
2.3
3
4.5
A
TSDN
Thermal shutdown threshold
Shutdown temperature(1)
165
°C
Hysteresis(1)
35
tON
On time
VIN = 12 V, VO = 1.05 V
150
ns
tOFF(MIN)
Minimum off time
TA = 25°C, VFB = 0.7 V
260
310
ns
ISS
Soft-start charge current
VSS = 1 V
1.4
2
2.6
µA
Soft-start discharge current
VSS = 0.5 V
0.1
0.2
mA
UVLO
Undervoltage lockout threshold
Wake up VREG5 voltage
3.45
3.75
4.05
V
Hysteresis VREG5 voltage
0.13
0.32
0.48


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