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LT1767-3.3 fiches techniques PDF

Linear Technology - 1.25MHz Step-Down Switching Regulators

Numéro de référence LT1767-3.3
Description 1.25MHz Step-Down Switching Regulators
Fabricant Linear Technology 
Logo Linear Technology 





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LT1767-3.3 fiche technique
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
Monolithic 1.5A, 1.25MHz
Step-Down Switching Regulators
Features
n 1.5A Switch in a Small MSOP Package
n Constant 1.25MHz Switching Frequency
n High Power Exposed Pad (MS8E) Package
n Wide Operating Voltage Range: 3V to 25V
n High Efficiency 0.22Ω Switch
n 1.2V Feedback Reference Voltage
n Fixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V
n 2% Overall Output Tolerance
n Uses Low Profile Surface Mount Components
n Low Shutdown Current: 6µA
n Synchronizable to 2MHz
n Current Mode Loop Control
n Constant Maximum Switch Current Rating at All Duty
Cycles*
Applications
n DSL Modems
n Portable Computers
n Wall Adapters
n Battery-Powered Systems
n Distributed Power
Description
The LT®1767 is a 1.25MHz monolithic buck switching
regulator. A high efficiency 1.5A, 0.22Ω switch is included
on the die together with all the control circuitry required
to complete 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 range. A
low dropout internal regulator maintains consistent per-
formance 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 6µA. Maximum
switch current remains constant at all duty cycles. Syn-
chronization allows an external logic level signal to increase
the internal oscillator from 1.5MHz to 2MHz.
The LT1767 is available in an 8-pin MSOP fused lead-frame
package and a low thermal resistance exposed pad package.
Full cycle-by-cycle current limit and thermal shutdown are
provided. High frequency operation allows the reduction
of input and output filtering components and permits the
use of chip inductors.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 6611131, 6498466.
Typical Application
12V to 3.3V Step-Down Converter
D2
CMDSH-3
VIN
12V C3
2.2µF
CERAMIC
OPEN
OR
HIGH
= ON
C2
0.1µF
BOOST
VIN VSW
LT1767-3.3
SHDN
FB
SYNC GND VC
CC
1.5nF
RC
4.7k
L1
5µH
D1
UPS120
*MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.
OUTPUT
3.3V
1.2A*
C1
10µF
CERAMIC
1767 TA01
For more information www.linear.com/LT1767
Efficiency vs Load Current
95
VIN = 10V
90 VOUT = 5V
85
80
75
70
0 0.2 0.4 0.6 0.8 1 1.2 1.4
LOAD CURRENT (A)
1767 TA01a
1767fb
1

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