LT1533C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1533C' PDF : 20 Pages View PDF
LT1533
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.9V, VFB = VREF. COL A, COL B, SHDN, NFB, DUTY pins open, unless otherwise noted.
SYMBOL PARAMETER
gm
Error Amplifier Transconductance
IESK
Error Amplifier Sink Current
IESRC
Error Amplifier Source Current
VCLH
Error Amplifier Clamp Voltage
VCLL
Error Amplifier Clamp Voltage
AV
Error Amplifier Voltage Gain
Oscillator and Sync
CONDITIONS
∆IC = ±25µA
VFB = VREF + 150mV, VC = 0.9V, VSHDN = 1V
VFB = VREF – 150mV, VC = 0.9V, VSHDN = 1V
High Clamp, VFB = 1V
Low Clamp, VFB = 1.5V
MIN TYP MAX
1100 1500 1900
q 700
2300
q 120
200
350
q 120
200
350
1.33
0.1
180 250
UNITS
µmho
µmho
µA
µA
V
V
V/ V
f MAX
Maximum Switch Frequency
f SYNC
Synchronization Frequency Range
RSYNC SYNC Pin Input Resistance
VFBfs
FB Pin Threshold for Frequency Shift
Output Switches
fOSC = 250kHz
5% Reduction from Nominal
250
kHz
q
375
kHz
40
kΩ
0.4
V
DCMAX Maximum Switch Duty Cycle
DUTY Pin Open, RVSL = RCSL = 4.9k, fOSC = 25kHz q 44
45.5
%
DUTY Pin Grounded, Forced 50% Duty Cycle
50.0
%
tIBL
BV
RON
ILIM(MAX)
Switch Current Limit Blanking Time
Output Switch Breakdown Voltage
Output Switch-On Resistance
Maximum Current Limit
Short-Circuit Current Limit
2.7V ≤ VIN ≤ 23V
ICOL A or ICOL B = 0.75A
Duty Cycle = 15%
Duty Cycle = 40%
200
ns
q 25
30
V
q
0.5
0.85
Ω
1
1.25
1.8
A
0.8
A
∆IIN/∆ISW Supply Current Increase During
Switch-On Time
VDUTYTH DUTY Pin Threshold
Slew Control
VSLEWR
VSLEWF
ISLEWR
ISLEWF
Output Voltage Slew Rising Edge
Output Voltage Slew Falling Edge
Output Current Slew Rising Edge
Output Current Slew Falling Edge
Either A or B, RVSL, RCSL = 17k
Either A or B, RVSL, RCSL = 17k
Either A or B, RVSL, RCSL = 17k
Either A or B, RVSL, RCSL = 17k
16
mA/A
0.35
11
V/µs
14.5
V/µs
1.3
A/µs
1.3
A/µs
The q denotes specifications that apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1533 is designed to operate over the junction temperature
range of – 4 0°C to 125°C, but is neither tested nor guaranteed beyond 0°C
to 100°C for C grade or – 40°C to 100°C for I grade.
3
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