Datasheet

 
  
 
SLVS423 A− MAY 2002 − REVISED SEPTEMBER 2002
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, V
CC
= 6 V,
f
osc
= 500 kHz (unless otherwise noted) (continued)
supply current
PARAMETER
TEST CONDITIONS
TL1454A
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
I
CC(stby)
Standby supply current
RT open, CT = 1.5 V, No load,
V
O
(COMP1, COMP2) = 1.25 V,
3.1 6 mA
I
CC(average)
Average supply current
R
T
= 10 kΩ,
50% duty cycle,
C
T
= 120 pF,
Outputs open
3.5 7 mA
electrical characteristics, V
CC
= 6 V, f
osc
= 500 kHz, T
A
= 25°C (unless otherwise noted)
reference
PARAMETER
TEST CONDITIONS
TL1454AY
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
V
ref
Output voltage, REF I
O
= 1 mA 1.26 V
Input regulation V
OC
= 3.6 V to 20 V, I
O
= 1 mA 2 mV
Output regulation I
O
= 0.1 mA to 1 mA 1 mV
Output voltage change with temperature
I
O
= 1 mA −1.25
mV
Output voltage change with temperature
I
O
= 1 mA −2.5
mV
I
OS
Short-circuit output current V
ref
= 0 V 30 mA
undervoltage lockout (UVLO)
PARAMETER
TEST CONDITIONS
TL1454AY
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
V
IT+
Positive-going threshold voltage 2.9 V
V
IT−
Negative-going threshold voltage 2.7 V
V
hys
Hysteresis, V
IT+
− V
IT−
200 mV
short-circuit protection (SCP)
PARAMETER
TEST CONDITIONS
TL1454AY
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
V
IT
Input threshold voltage 1 V
V
stby
†
Standby voltage
No pullup
185 mV
V
I(latched)
Latched-mode input voltage
No pullup
60 mV
V
IT(COMP)
Comparator threshold voltage COMP1, COMP2 1 V
Input source current V
O(SCP)
= 0 −15 µA
†
This symbol is not presently listed within EIA/JEDEC standards for semiconductor symbology.
oscillator
PARAMETER
TEST CONDITIONS
TL1454AY
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
f
osc
Frequency C
T
= 120 pF, R
T
= 10 kΩ 500 kHz
Standard deviation of frequency 50 kHz
Frequency change with voltage V
CC
= 3.6 V to 20 V 10 kHz
Frequency change with temperature
T
A
= T
A(min)
to 25°C −2
kHz
Frequency change with temperature
T
A
= 25°C to 85°C −10
kHz
Maximum ramp voltage 1.8 V
Minimum ramp voltage 1.1 V