Datasheet

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      
SLVS278E – AUGUST 2000 – REVISED MARCH 2003
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended free-air temperature range, V
CC
= 7 V (unless
otherwise noted)
reference voltage
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
ref
Reference voltage 0.85 V
T
A
= 25°C, I = 50 µA –1% 1%
V
ref
(
tol
)
Reference voltage tolerance
T
A
= –20°C to 85°C,
I = 50 µA –1.5% 1.5%
V
ref(tol)
Reference
voltage
tolerance
T
A
= –40°C to 85°C, I = 50 µA –2% 2%
R
(egin)
Line regulation V
CC
= 4.5 V to 28 V, I = 50 µA 0.05 3 mV
R
(egl)
Load regulation I = 0.1 µA to 1 mA 0.15 5 mV
oscillator
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
osc
Frequency PWM mode, CT = 44 pF, T
A
= 25 °C 300 kHz
V
High le el o tp t oltage
DC 1 1.1 1.2
V
V
OH
High level output voltage
f
osc
= 300 kHz
1.17
V
V
Lo le el o tp t oltage
DC 0.4 0.5 0.6
V
V
OL
Low level output voltage
f
osc
= 300 kHz 0.43
V
error amplifier
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IO
Input offset voltage T
A
= 25°C 2 10 mV
Open-loop voltage gain 50 dB
Unity-gain bandwidth 2.5 MHz
I
(snk)
Output sink current V
O
= 1 V 0.3 0.7 mA
I
(src)
Output source current V
O
= 1 V 0.2 0.9 mA
skip comparator
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
hys
Hysteresis window SKIP mode 9 mV
duty control
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DUTY Maximum duty cycle 300 kHz, V
I
= 0 V 83%
control
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
High le el inp t oltage
STBY1, STBY2 2.2
V
V
IH
High-level input voltage
PWM/SKIP, 5V_STBY
2.2
V
V
Lo le el inp t oltage
STBY1, STBY2 0.3
V
V
IL
Low-level input voltage
PWM/SKIP, 5V_STBY 0.3
V
5-V internal switch
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
(TO_H)
Threshold
4.2 4.8
V
V
(TO_L)
Threshold
4.1 4.7
V
V
hys
Hysteresis 30 200 mV