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ꢀꢁ ꢂ ꢃꢄ ꢅꢆ ꢇ
SLVS398D − JUNE 2001 − REVISED JULY 2003
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range unless otherwise noted
PARAMETER
SUPPLY VOLTAGE, VIN
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input voltage range, VIN
3.0
11
6.0
V
f = 350 kHz, SYNC ≤ 0.8 V, RT open,
PH pin open
s
15.8
f = 550 kHz, SYNC ≥ 2.5 V, RT open,
PH pin open
I
Quiescent current
mA
s
(Q)
16
23.5
1.4
Shutdown, SS/ENA = 0 V
1
UNDER VOLTAGE LOCK OUT
Start threshold voltage, UVLO
2.95
2.80
0.16
2.5
3.0
V
V
Stop threshold voltage, UVLO
Hysteresis voltage, UVLO
2.70
0.14
V
(1)
Rising and falling edge deglitch, UVLO
µs
BIAS VOLTAGE
Output voltage, VBIAS
Output current, VBIAS
I
= 0
2.70
2.80
2.90
100
V
(VBIAS)
(2)
µA
CUMULATIVE REFERENCE
V
ref
Accuracy
0.882 0.891
0.900
V
REGULATION
I
L
I
L
I
L
I
L
= 3 A, f = 350 kHz, T = 85°C
0.04
0.04
0.03
0.03
s
J
(1)(3)
Line regulation
%/V
%/A
= 3 A, f = 550 kHz, T = 85°C
s
J
= 0 A to 6 A, f = 350 kHz, T = 85°C
s
J
(1)(3)
Load regulation
= 0 A to 6 A, f = 550 kHz, T = 85°C
s
J
OSCILLATOR
Internally set—free running frequency
SYNC ≤ 0.8 V,
SYNC ≥ 2.5 V,
RT open
RT open
280
440
252
460
663
2.5
350
550
280
500
700
420
660
308
540
762
kHz
kHz
(1)
RT = 180 kΩ (1% resistor to AGND)
RT = 100 kΩ (1% resistor to AGND)
(1)
RT = 68 kΩ (1% resistor to AGND)
Externally set—free running frequency range
High level threshold, SYNC
V
V
Low level threshold, SYNC
0.8
Pulse duration, external synchronization,
SYNC
50
ns
(1)
(1)
Frequency range, SYNC
(1)
330
700
kHz
V
Ramp valley
Ramp amplitude (peak-to-peak)
0.75
1
(1)
(1)
V
Minimum controllable on time
Maximum duty cycle
200
ns
90%
(1)
(2)
(3)
Specified by design
Static resistive loads only
Specified by the circuit used in Figure 10
3
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