TPS54229_15 Datasheet, PDF (3/25 Pages) Texas Instruments – 4.5V to 18V INPUT, 2-A SYNCHRONOUS STEP DOWN CONVERTER WITH INTEGRATED FET

TPS54229
www.ti.com
SLVSAZ8A – SEPTEMBER 2011 – REVISED MARCH 2012
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
V_IN
Supply input voltage range
V_I
Input voltage range
V_O
Output voltage range
I_O
Output Current range
T_A
Operating free-air temperature
T_J
Operating junction temperature
VBST
VBST (10 ns transient)
VBST(vs SW)
SS
EN
VFB
SW
SW (10 ns transient)
GND
VREG5
I_VREG5
MIN
MAX UNIT
4.5
18
V
–0.1
24
-0.1
27
–0.1
5.7
–0.1
5.7
–0.1
18
V
–0.1
5.5
–1.8
18
–3
21
–0.1
0.1
–0.1
5.7
V
0
10 mA
–40
85
°C
–40
150
°C
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, V_IN = 12 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SUPPLY CURRENT
I_VIN
Operating - non-switching supply current
V_IN current, T_A = 25°C, EN = 5 V,
V_FB = 0.8 V
I_VINSDN
Shutdown supply current
V_IN current, T_A = 25°C, EN = 0 V
LOGIC THRESHOLD
V_ENH
EN high-level input voltage
V_ENL
EN low-level input voltage
R_EN
EN pin resistance to GND
V_FB VOLTAGE AND DISCHARGE RESISTANCE
V_FBTH
V_FB threshold voltage
I_VFB
V_FB input current
V_REG5 OUTPUT
V_VREG5
V_REG5 output voltage
I_VREG5
Output current
MOSFET
R_DS(on)h High side switch resistance
R_DS(on)l
Low side switch resistance
CURRENT LIMIT
I_ocl
Current limit
EN
EN
V_EN = 12 V
T_A = 25°C, V_O = 1.05 V, continuous mode
V_FB = 0.8 V, T_A = 25°C
T_A = 25°C, 6.0 V < V_IN < 18 V,
0 < I_VREG5 < 5 mA
V_IN = 6 V, V_REG5 = 4.0 V, T_A = 25°C⁽¹⁾
25°C, V_BST - SW = 5.5 V⁽¹⁾
25°C ⁽¹⁾
L out = 2.2 μH⁽¹⁾
(1) Not production tested.
MIN TYP MAX UNIT
840 1200 μA
5.8
10 μA
1.6
V
0.6 V
220 440 880 kΩ
749 765 781 mV
0 ±0.1 μA
5.5
V
60
mA
160
mΩ
110
mΩ
2.5 3.3 4.7 A
Copyright © 2011–2012, Texas Instruments Incorporated
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