lt1533 Linear Technology Corporation, lt1533 Datasheet - Page 3

• Manufacturer Part Number: lt1533
• Description: Ultralow Noise 1a Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
V
g
I
I
V
V
A
Oscillator and Sync
f
f
R
V
Output Switches
DC
t
BV
R
I
V
Slew Control
V
V
I
I
The
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
SYMBOL PARAMETER
ESK
ESRC
IBL
LIM(MAX)
SLEWR
SLEWF
MAX
SYNC
m
CLH
CLL
V
FBfs
DUTYTH
SLEWR
SLEWF
IN
SYNC
ON
I
IN
MAX
/ I
= 5V, V
denotes specifications that apply over the full operating
SW
Error Amplifier Transconductance
Error Amplifier Sink Current
Error Amplifier Source Current
Error Amplifier Clamp Voltage
Error Amplifier Clamp Voltage
Error Amplifier Voltage Gain
Maximum Switch Frequency
Synchronization Frequency Range
SYNC Pin Input Resistance
FB Pin Threshold for Frequency Shift
Maximum Switch Duty Cycle
Switch Current Limit Blanking Time
Output Switch Breakdown Voltage
Output Switch-On Resistance
Maximum Current Limit
Short-Circuit Current Limit
Supply Current Increase During
Switch-On Time
DUTY Pin Threshold
Output Voltage Slew Rising Edge
Output Voltage Slew Falling Edge
Output Current Slew Rising Edge
Output Current Slew Falling Edge
C
= 0.9V, V
FB
= V
REF
. COL A, COL B, SHDN, NFB, DUTY pins open, unless otherwise noted.
CONDITIONS
V
V
High Clamp, V
Low Clamp, V
f
5% Reduction from Nominal
DUTY Pin Open, R
DUTY Pin Grounded, Forced 50% Duty Cycle
2.7V V
I
Duty Cycle = 15%
Duty Cycle = 40%
Either A or B, R
Either A or B, R
Either A or B, R
Either A or B, R
OSC
COL A
FB
FB
I
C
= 25 A
= V
= V
= 250kHz
or I
REF
REF
IN
COL B
+ 150mV, V
– 150mV, V
23V
FB
FB
= 0.75A
VSL
VSL
VSL
VSL
= 1.5V
= 1V
VSL
, R
, R
, R
, R
CSL
CSL
CSL
CSL
= R
C
C
= 0.9V, V
= 0.9V, V
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.
= 17k
= 17k
= 17k
= 17k
CSL
= 4.9k, f
SHDN
SHDN
OSC
= 1V
= 1V
= 25kHz
1100
MIN
700
120
120
180
0.8
44
25
1
1500
1.33
45.5
50.0
1.25
0.35
14.5
TYP
200
200
250
250
200
0.4
0.5
1.3
1.3
0.1
40
30
16
11
MAX
1900
2300
0.85
350
350
375
1.8
LT1533
UNITS
mA/A
3
mho
mho
V/ s
V/ s
A/ s
A/ s
V/V
kHz
kHz
k
ns
%
%
A
A
V
V
V
V
A
A