Datasheet

TPS40303, TPS40304, TPS40305
www.ti.com SLUS964A –NOVEMBER 2009–REVISED AUGUST 2012
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 125°C, V
VDD
= 12 V, all parameters at zero power dissipation (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOLTAGE REFERENCE
T
J
= 25°C, 3 V < V
VDD
< 20 V 597 600 603
V
FB
FB input voltage mV
–40°C < T
J
< 125°C, 3 V < V
VDD
< 20 594 600 606
V
INPUT SUPPLY
V
VDD
Input supply voltage range 3 20 V
IDD
SD
Shutdown supply current V
EN/SS
< 0.2 V 70 100 µA
IDD
Q
Quiescent, non-switching Let EN/SS float, V
FB
= 1 V 2.5 3.5 mA
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 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
= 3 V 70 110 mV
OSCILLATOR
TPS40303 270 300 330 kHz
f
SW
PWM frequency TPS40304 3 V < V
VDD
< 20 V 540 600 660 kHz
TPS40305 1.02 1.20 1.38 MHz
V
RAMP
(1)
Ramp amplitude V
VDD
/6.6 V
VDD
/6 V
VDD
/5.4 V
Frequency spread spectrum frequency
f
SWFSS
12% f
SW
deviation
f
MOD
Modulation frequency 25 KHz
PWM
TPS40303 90%
D
MAX
(1)
Maximum duty cycle TPS40304 V
FB
= 0 V, 3 V < V
VDD
< 20 V 90%
TPS40305 85%
t
ON(min)
(1)
Minimum controllable pulse width 70 ns
HDRV off to LDRV on 5 25 35
t
DEAD
Output driver dead time ns
LDRV off to HDRV on 5 25 30
ERROR AMPLIFIER
G
BWP
(1)
Gain bandwidth product 10 24 MHz
A
OL
(1)
Open loop gain 60 dB
I
IB
Input bias current (current out of FB pin) V
FB
= 0.6 V 75 nA
I
EAOP
Output source current V
FB
= 0 V 2
mA
I
EAOM
Output sink current V
FB
= 1 V 2
(1) Ensured by design. Not production tested.
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