English
Language : 

TPS40054_16 Datasheet, PDF (5/39 Pages) Texas Instruments – Wide-Input Synchronous Buck Controller
◁
www.ti.com
TPS40054: Not Recommended For New Designs
TPS40054, TPS40055, TPS40057
SLUS593I – DECEMBER 2003 – REVISED DECEMBER 2014
6.4 Electrical Characteristics
TA = –40°C to 85°C, VIN = 24 Vdc, RT = 90.9 kΩ, IKFF = 150 µA, fSW = 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
INPUT SUPPLY
VIN
Input voltage range, VIN
OPERATING CURRENT
8
40 V
IDD
Quiescent current
BP5
Output drivers not switching, VFB ≥ 0.75 V
1.5
3.0 mA
VBP5 Output voltage
OSCILLATOR/RAMP GENERATOR
IO ≤ 1 mA
4.7
5
5.2 V
fOSC
VRAMP
VIH
VIL
ISYNC
Accuracy
PWM ramp voltage(1)
High-level input voltage, SYNC
Low-level input voltage, SYNC
Input current, SYNC
Pulse width, SYNC
8 V ≤ VIN ≤ 40 V
VPEAK – VVAL
470
520
570 kHz
2
V
2
0.8 V
5
10 µA
50
ns
VRT
RT voltage
DMAX Maximum duty cycle
Minumum duty cycle
VKFF
IKFF
Feed-forward voltage
Feed-forward current operating range(1) (2)
SOFT-START
VFB = 0 V, fSW ≤ 500 kHz
VFB = 0 V, 500 kHz ≤ fSW ≤ 1 MHz(1)
VFB ≥ 0.75 V
2.38
85%
80%
3.35
20
2.5 2.58 V
94%
0%
3.48 3.65 V
1100 µA
ISS/SD
VSS/SD
tDSCH
tSS/SD
BP10
Soft-start source current
Soft-start clamp voltage
Discharge time
Soft-start time
CSS/SD = 220 pF
CSS/SD = 220 pF, 0 V ≤ VSS/SD ≤ 1.6 V
1.65
2.35 2.95 µA
3.7
V
1.6
2.2
2.8
µs
115
150
215
VBP10 Output voltage
ERROR AMPLIFIER
IO ≤ 1 mA
9.0
9.6 10.3 V
VFB
Feedback input voltage
GBW
AVOL
IOH
IOL
VOH
VOL
IBIAS
Gain bandwidth(1)
Open loop gain
High-level output source current
Low-level output sink current
High-level output voltage
Low-level output voltage
Input bias current
8 V ≤ VIN ≤ 40 V, TA = 25°C
8 V ≤ VIN ≤ 40 V, 0°C ≤ TA ≤ 85°C
8 V ≤ VIN ≤ 40 V, -40°C≤ TA ≤ 85°C
ISOURCE = 500 µA
ISINK = 500 µA
VFB = 0.7 V
0.698
0.693
0.693
3.0
60
2.0
2.0
3.2
0.7 0.704
0.7 0.707 V
0.7 0.715
5
MHz
80
dB
4
mA
4
3.5
V
0.2 0.35
100
200 nA
(1) Ensured by design. Not production tested.
(2) IKFF increases with SYNC frequency, maximum duty cycle decreases with IKFF.
Copyright © 2003–2014, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Links: TPS40054 TPS40055 TPS40057
 ▷