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LT1777CS Datasheet(PDF) 3 Page - Linear Technology

Part # LT1777CS
Description  Low Noise Step-Down Switching Regulator
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1777CS Datasheet(HTML) 3 Page - Linear Technology

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LT1777
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Control circuitry powered from VCC.
Note 3: Switch current limit is DC trimmed and tested in production.
Inductor dI/dt rate will cause a somewhat higher current limit in actual
application.
Note 4: During normal operation the VSW pin may fly as much as 3V
below ground. However, the LT1777 may not be used in an inverting
DC/DC configuration.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Switch
RON
Output Switch On Voltage
ISW = 0.5A
1.0
1.5
V
ILIM
Switch Current Limit
(Note 3)
q
0.55
0.70
1.0
A
Output dl/dt Sense Voltage
1.3
V
q
0.6
2.0
V
Current Amplifier
Control Pin Threshold
Duty Cycle = 0%
0.9
1.1
1.25
V
Control Voltage to Switch Transconductance
2
A/V
Timing
f
Switching Frequency
90
100
110
kHz
q
85
115
kHz
Maximum Switch Duty Cycle
q
85
90
%
Sync Function
Minimum Sync Amplitude
q
1.5
2.2
V
Synchronization Range
q
130
250
kHz
SYNC Pin Input R
40
k
Ω
SHDN Pin Function
VSHDN
Shutdown Mode Threshold
0.5
V
q
0.2
0.8
V
Upper Lockout Threshold
Switching Action On
1.260
V
Lower Lockout Threshold
Switching Action Off
1.245
V
ISHDN
Shutdown Pin Current
VSHDN = 0V
12
20
µA
VSHDN = 1.25V
2.5
10
µA
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
VIN = 24V, VSW Open, VCC = 5V, VC = 1.4V unless otherwise noted.


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