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SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004
RECOMMENDED OPERATING CONDITIONS
MIN NOM
MAX
20
UNIT
V
Input voltage range, V
4.5
I
Operating junction temperature, T
−40
125
°C
J
ELECTRICAL CHARACTERISTICS
T = –40°C to 125°C, VIN = 4.5 V to 20 V (unless otherwise noted)
J
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY CURRENT
Operating Current, PH Pin open,
No external low side MOSFET, RT = Hi-Z
5
mA
I
Q
Quiescent current
Shutdown, ENA = 0 V
1.0
4.32
3.97
350
mA
V
Start threshold voltage
Stop threshold voltage
Hysteresis
4.49
1.24
3.69
1.02
V
VIN
mV
UNDER VOLTAGE LOCK OUT (UVLO PIN)
Start threshold voltage
1.20
1.10
100
V
V
Stop threshold voltage
Hysteresis
UVLO
mV
BIAS VOLTAGE (VBIAS PIN)
I
I
= 1 mA, VIN ≥ 12 V
7.5
4.4
7.8
8.0
4.5
VBIAS
VBIAS Output voltage
V
= 1 mA, VIN = 4.5 V
4.47
VBIAS
REFERENCE SYSTEM ACCURACY
T = 25°C
J
0.888 0.891 0.894
0.882 0.891 0.899
V
V
Reference voltage
OSCILLATOR (RT PIN)
RT Grounded
200
400
425
250
500
500
300
600
575
Internally set PWM switching frequency
Externally set PWM switching frequency
kHz
kHz
RT Open
RT = 100 kΩ (1% resistor to AGND)
FALLING EDGE TRIGGERED BIDIRECTIONAL SYNC SYSTEM (SYNC PIN)
(1)
SYNC out low-to-high rise time (10%/90%)
25 pF to ground
25 pF to ground
200
5
500
10
ns
ns
(1)
SYNC out high-to-low fall time (90%/10%)
Delay from rising edge to rising edge of
PH pins, see Figure 19
(1)
Falling edge delay time
180
°
(1)
Minimum input pulsewidth
RT = 100 kΩ
RT = 100 kΩ
100
360
ns
ns
(1)
Delay (falling edge SYNC to rising edge PH)
SYNC out high level voltage
50 kΩ resistor to ground, no pullup
resistor
2.5
0.8
V
SYNC out low level voltage
SYNC in low level threshold
SYNC in high level threshold
0.6
V
V
V
2.3
10%
770
Percentage of programmed frequency
−10%
225
(1)
SYNC in frequency range
kHz
(1)
Ensured by design, not production tested.
3
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