LT1777IS#PBF Linear Technology, LT1777IS#PBF Datasheet - Page 3

• Manufacturer Part Number: LT1777IS#PBF
• Description: IC REG SW BUCK LO NOISE 16-SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1777IS#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 30 V
• Current - Output: 700mA
• Frequency - Switching: 100kHz
• Voltage - Input: 12 ~ 48 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Primary Input Voltage: 48V
• No. Of Outputs: 1
• Output Voltage: 40.8V
• Output Current: 1A
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

The
V
SYMBOL
Output Switch
R
I
Current Amplifier
Timing
f
Sync Function
SHDN Pin Function
V
I
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 V
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.
LIM
SHDN
SHDN
IN
ON
= 24V, V
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
PARAMETER
Output Switch On Voltage
Switch Current Limit
Output dl/dt Sense Voltage
Control Pin Threshold
Control Voltage to Switch Transconductance
Switching Frequency
Maximum Switch Duty Cycle
Minimum Sync Amplitude
Synchronization Range
SYNC Pin Input R
Shutdown Mode Threshold
Upper Lockout Threshold
Lower Lockout Threshold
Shutdown Pin Current
SW
Open, V
CC
= 5V, V
C
= 1.4V unless otherwise noted.
CC
.
CONDITIONS
I
(Note 3)
Duty Cycle = 0%
Switching Action On
Switching Action Off
V
V
SW
SHDN
SHDN
= 0.5A
= 0V
= 1.25V
Note 4: During normal operation the V
below ground. However, the LT1777 may not be used in an inverting
DC/DC configuration.
0.55
MIN
130
0.6
0.9
0.2
90
85
85
SW
pin may fly as much as 3V
1.260
1.245
0.70
TYP
100
1.0
1.3
1.1
1.5
0.5
2.5
90
40
12
2
J
MAX
= 25 C.
1.25
110
115
250
1.5
1.0
2.0
2.2
0.8
20
10
LT1777
UNITS
3
kHz
kHz
kHz
A/V
k
%
V
A
V
V
V
V
V
V
V
V
A
A