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LT1765-2.5 Datasheet

  • LT1765-2.5

  • Monolithic 3A, 1.25MHz Step-Down Switching Regulator

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LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
Monolithic 3A, 1.25MHz
Step-Down Switching Regulator
FEATURES
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DESCRIPTIO
3A Switch in a Thermally Enhanced 16-Lead
TSSOP or 8-Lead SO Package
Constant 1.25MHz Switching Frequency
Wide Operating Voltage Range: 3V to 25V
High Efficiency 0.09鈩?Switch
1.2V Feedback Reference Voltage
Uses Low Profile Surface Mount Components
Low Shutdown Current: 15碌A(chǔ)
Synchronizable to 2MHz
Current Mode Loop Control
Constant Maximum Switch Current Rating at
All Duty Cycles*
The LT
廬
1765 is a 1.25MHz monolithic buck switching
regulator. A high efficiency 3A, 0.09鈩?switch is included
on the die together with all the control circuitry required
to construct a high frequency, current mode switching
regulator. Current mode control provides fast transient
response and excellent loop stability.
New design techniques achieve high efficiency at high
switching frequencies over a wide operating voltage range.
A low dropout internal regulator maintains consistent
performance over a wide range of inputs from 24V
systems to Li-Ion batteries. An operating supply current
of 1mA improves efficiency, especially at lower output
currents. Shutdown reduces quiescent current to 15碌A(chǔ).
Maximum switch current remains constant at all duty
cycles. Synchronization allows an external logic level
signal to increase the internal oscillator into the range of
1.6MHz to 2MHz.
Full cycle-by-cycle current control and thermal shutdown
are provided. High frequency operation allows the reduc-
tion of input and output filtering components and permits
the use of chip inductors.
APPLICATIO S
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DSL Modems
Portable Computers
Regulated Wall Adapters
Battery-Powered Systems
Distributed Power
, LTC and LT are registered trademarks of Linear Technology Corporation.
* Patent Pending
TYPICAL APPLICATIO
5V to 3.3V Step-Down Converter
CMDSH-3
0.18碌F
INPUT
5V
2.2碌F
CERAMIC
EFFICIENCY (%)
90
BOOST
V
IN
LT1765-3.3
OFF ON
SHDN
SYNC
FB
GND
V
C
2.2nF
V
SW
1.5碌H
OUTPUT
3.3V
2.5A
UPS120
4.7碌F
CERAMIC
1765 TA01
U
Efficiency vs Load Current
V
IN
= 10V
V
OUT
= 5V
85
80
75
70
0
1.0
1.5
0.5
SWITCH CURRENT (A)
2.0
1765 鈥?TAO1a
U
U
sn1765 1765fas
1

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