Datasheet

TPS56221
www.ti.com SLUSAH5B –MARCH 2011–REVISED SEPTEMBER 2012
ELECTRICAL CHARACTERISTICS
–40°C ≤ T
J
≤ 125°C, V
VDD
= 12 V, all parameters at zero power dissipation (unless otherwise noted)
UNIT
PARAMETER TEST CONDITIONS MIN TYP MAX
S
VOLTAGE REFERENCE
T
J
= 25°C, 4.5 V ≤ V
VDD
≤ 14 V 597 600 603
V
FB
FB input voltage mV
–40°C ≤ T
J
≤ 125°C,
594 600 606
4.5 V ≤ V
VDD
≤ 14 V
INPUT SUPPLY
V
VDD
Input supply voltage range 4.5 14 V
IVDD
SD
Shutdown supply current V
EN/SS
= 0.2 V 80 120 µA
IVDD
Q
Quiescent, non-switching Let EN/SS float, V
FB
= 1 V 2.5 5.0 mA
V
UVLO
UVLO ON Voltage 4.0 4.3 V
V
UVLO(HYS)
UVLO hysteresis 500 700 mV
ENABLE/SOFT-START
V
IH
High-level input voltage, EN/SS 0.55 0.70 1.00 V
V
IL
Low-level input voltage, EN/SS 0.27 0.30 0.33 V
I
SS
Soft-start source current 8 10 12 µA
V
SS
Soft-start voltage level – Start of ramp 0.4 0.8 1.3 V
BP REGULATOR
V
BP
Output voltage I
BP
= 10 mA 6.2 6.5 6.8 V
V
DO
Regulator dropout voltage, V
VDD
– V
BP
I
BP
= 25 mA, V
VDD
= 4.5 V 70 125 mV
OSCILLATOR
R
COMP
= 40.2 kΩ,
270 300 330 kHz
4.5 V ≤ V
VDD
≤ 14 V
R
COMP
= open,
f
SW
Switching Frequency 450 500 550 kHz
4.5 V ≤ V
VDD
≤ 14 V
R
COMP
= 13.3 kΩ,
0.8 0.95 1.1 MHz
4.5 V ≤ V
VDD
≤ 14 V
V
RAMP
(1)
Ramp amplitude V
VDD
/6.6 V
VDD
/6 V
VDD
/5.4 V
PWM
f
sw
= 300 kHz, V
FB
= 0 V,
93%
4.5 V ≤ V
VDD
≤ 14 V
f
sw
= 500 kHz, V
FB
= 0 V,
D
MAX
(1)
Maximum duty cycle 90%
4.5 V ≤ V
VDD
≤ 14 V
f
sw
= 1 MHz, V
FB
= 0 V,
85%
4.5 V ≤ V
VDD
≤ 14 V
t
ON(min)
(1)
Minimum controllable pulse width 100 ns
ERROR AMPLIFIER
GBWP
(1)
Gain bandwidth product 10 24 MHz
A
O
L
(1)
Open loop gain 60 dB
Input bias current (current out of FB
I
IB
V
FB
= 0.6 V 75 nA
pin)
I
EAOP
Output source current V
FB
= 0 V 1.5 mA
I
EAOM
Output sink current V
FB
= 1 V 1.5 mA
(1) Ensured by design. Not production tested
Copyright © 2011–2012, Texas Instruments Incorporated 3
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