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LT1533CS Datenblatt(PDF) 3 Page - Linear Technology

Teilenummer LT1533CS
Bauteilbeschribung  Ultralow Noise 1A Switching Regulator
PDF  20 Pages
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1533CS Datenblatt(HTML) 3 Page - Linear Technology

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LT1533
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.9V, VFB = VREF. COL A, COL B, SHDN, NFB, DUTY pins open, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
gm
Error Amplifier Transconductance
∆IC = ±25µA
1100
1500
1900
µmho
q
700
2300
µmho
IESK
Error Amplifier Sink Current
VFB = VREF + 150mV, VC = 0.9V, VSHDN = 1V
q
120
200
350
µA
IESRC
Error Amplifier Source Current
VFB = VREF – 150mV, VC = 0.9V, VSHDN = 1V
q
120
200
350
µA
VCLH
Error Amplifier Clamp Voltage
High Clamp, VFB = 1V
1.33
V
VCLL
Error Amplifier Clamp Voltage
Low Clamp, VFB = 1.5V
0.1
V
AV
Error Amplifier Voltage Gain
180
250
V/V
Oscillator and Sync
fMAX
Maximum Switch Frequency
250
kHz
fSYNC
Synchronization Frequency Range
fOSC = 250kHz
q
375
kHz
RSYNC
SYNC Pin Input Resistance
40
k
Ω
VFBfs
FB Pin Threshold for Frequency Shift
5% Reduction from Nominal
0.4
V
Output Switches
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
Switch Current Limit Blanking Time
200
ns
BV
Output Switch Breakdown Voltage
2.7V
≤ VIN ≤ 23V
q
25
30
V
RON
Output Switch-On Resistance
ICOL A or ICOL B = 0.75A
q
0.5
0.85
Ω
ILIM(MAX)
Maximum Current Limit
Duty Cycle = 15%
1
1.25
1.8
A
Short-Circuit Current Limit
Duty Cycle = 40%
0.8
A
∆IIN/∆ISW Supply Current Increase During
16
mA/A
Switch-On Time
VDUTYTH
DUTY Pin Threshold
0.35
Slew Control
VSLEWR
Output Voltage Slew Rising Edge
Either A or B, RVSL, RCSL = 17k
11
V/
µs
VSLEWF
Output Voltage Slew Falling Edge
Either A or B, RVSL, RCSL = 17k
14.5
V/
µs
ISLEWR
Output Current Slew Rising Edge
Either A or B, RVSL, RCSL = 17k
1.3
A/
µs
ISLEWF
Output Current Slew Falling Edge
Either A or B, RVSL, RCSL = 17k
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.



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