Datasheet
SLVS397C − JULY 2001 − REVISED FEBRUARY 2005
www.ti.com
3
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to +125°C, V
I
= 3 V to 6 V over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE, VIN
Input voltage range, VIN 3.0 6.0 V
V
ID
Differential voltage, AGND to PGND −0.30 0.30 V
Switching freq. = 350 kHz, RT open 10 16
I
(Q)
Quiescent current
Switching freq. = 500 kHz, RT = 100 kΩ 16 24
mA
I
(Q)
Quiescent current
Shutdown, SS/ENA = 0 V 1 1.4
mA
UNDERVOLTAGE LOCKOUT
Start threshold voltage, UVLO 2.95 3.00 V
Stop threshold voltage, UVLO 2.70 2.80 V
Hysteresis voltage, UVLO 0.14 0.16 V
Rising and falling edge deglitch, UVLO
(1)
2.5 µs
BIAS VOLTAGE
Output voltage, VBIAS I
(VBIAS)
= 0 2.70 2.80 2.90 V
Output current, VBIAS
(2)
100 µA
CUMULATIVE REFERENCE
Cumulative regulation accuracy (relative to
REFIN)
I
O
= − 6A to 6A,
Switching frequency = 350 kHz,
REFIN = 1.25 V
(1)
−1.5% 1.5%
OSCILLATOR
Internally set—free running frequency RT open 280 350 420 kHz
Externally set—free running frequency range RT = 68 kΩ to 180 kΩ 280 700 kHz
Externally set—free running frequency
accuracy
RT = 100 kΩ (1% resistor to AGND) 460 500 540 kHz
Ramp valley 0.75 V
Ramp amplitude (peak-to-peak) 1 V
Minimum controllable on time
(1)
200 ns
Maximum duty cycle
(1)
90%
Error amplifier open loop voltage gain 1 kΩ COMP to AGND
(1)
90 110 dB
Error amplifier unity gain bandwidth Parallel 10 kΩ, 160 pF COMP to AGND
(1)
3 5 MHz
Error amplifier common mode input voltage
range
(1)
0 2.85 V
Error amplifier common mode rejection ratio
(1)
65 dB
Input bias current, VSENSE VSENSE = REFIN = 1 V 60 250 nA
Input bias current, REFIN VSENSE = REFIN = 1.25 V 60 250 nA
Input offset voltage, REFIN VSENSE = REFIN = 1.25 V −1.5 1.5 mV
Input voltage range, REFIN
(1)
0 1.8 V
Output voltage slew rate (symmetric), COMP 1 1.4 V/µs
Common mode output voltage range, COMP
I
O
= 3 mA 2.65
V
Common mode output voltage range, COMP
I
O
= −3 mA 0.2
V
PWM comparator propagation delay time,
PWM comparator input to PH pin (excluding
deadtime)
10-mV overdrive
(1)
70 85 ns
Enable threshold voltage, ENA 0.82 1.20 1.40 V
Enable hysteresis voltage, ENA
(1)
0.03 V
Falling edge deglitch, ENA
(1)
2.5 µs
Leakage current, ENA V
I
= 5.5 V 1 µA
(1)
Ensured by design
(2)
Static resistive loads only