LT1268BCQ#TRPBF Linear Technology, LT1268BCQ#TRPBF Datasheet
LT1268BCQ#TRPBF
Manufacturer Part Number
LT1268BCQ#TRPBF
Description
IC SWITCHNG REG 7.5A 150KHZ 5-DD
Manufacturer
Linear Technology
Type
Step-Down (Buck), Inverting, Flybackr
Datasheet
1.LT1268CTPBF.pdf
(4 pages)
Specifications of LT1268BCQ#TRPBF
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.25 ~ 60 V
Current - Output
7.5A
Frequency - Switching
150kHz
Voltage - Input
3.5 ~ 30 V
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (5 leads + tab)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Internal Switch(s)
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
FEATURE
USER NOTE:
This data sheet is only intended to provide specifications, graphs, and a general functional
description of the LT1268B/LT1268. Application circuits are included to show the capability of the
LT1268B/LT1268. A complete design manual (AN19) should be obtained to assist in developing new
designs. This manual contains a comprehensive discussion of both the LT1070 and the external
components used with it, as well as complete formulas for calculating the values of these
components. The manual can also be used for the LT1268B/LT1268 factoring in the higher switch
current rating and higher operating frequency.
A
TYPICAL
PPLICATI
Wide Input Voltage Range: 3.5V to 30V
Low Quiescent Current: 7mA
Internal 7.5A Switch
Very Few External Parts Required
Self-Protected Against Overloads
Available in Standard and Surface Mount
5-Pin Packages
Can Be Externally Synchronized
(See LT1072 Data Sheet)
High Efficiency Boost Converter
PC Power Supply with Multiple Outputs
Battery Upconverter
Negative-to-Positive Converter
4.7V TO
5.3V
V
IN
+
C1
220 F
16V
A
S
O
PPLICATI
Boost Regulator with 5.3V 1% Output
**
CASE
U
*
†
V
COILTRONICS CTX8-5-52
COILTRONICS CTX2-5-52
OPTIONAL. D2 AND D3 ARE USED TO INCREASE
UNDERVOLTAGE LOCKOUT FROM 2.7V TO 4V.
IN
S
LT1268B
8 H, 5A*
D2, D3
1N4001
GND V
L1
†
V
SW
FB
C
R3
220
MBR1035
O
C2
0.068
D1
U
+
C3
390 F
16V
2 H, 5A**
L2
C5
0.02
R1
4.043k
0.1%
R2
1.24k
0.1%
LT1268 • TA01
D
The LT1268B and LT1268 are monolithic high power
switching regulators. Identical to the popular LT1070,
except for switching frequency (150kHz) and higher
switch current, they can be operated in all standard
switching configurations including buck, boost, flyback,
and inverting. A high current, high efficiency switch is
included on the die along with all oscillator, control, and
protection circuitry. Integration of all functions allows
the LT1268 to be built in standard 5-pin power packages.
This makes it extremely easy to use and provides “bust
proof” operations similar to that obtained with 3-pin
linear regulators.
The LT1268 operate with supply voltages from 3.5V to
30V and draw only 7mA quiescent current. By utilizing
current mode switching techniques, it provides excellent
AC and DC load and line regulation.
The LT1268 use an adaptive anti-sat switch drive to allow
very wide ranging load currents with no loss in efficiency.
An externally activated shutdown mode reduces total
supply current to 100 A typical for standby operation.
+
ESCRIPTIO
C4
390 F
16V
V
5.3V ±1%
3.75A
OUT
Switching Regulators
100
90
80
70
60
U
0
Efficiency of 5.3V Boost Converter
LT1268B/LT1268
1
7.5A, 150kHz
LOAD CURRENT (A)
V
IN
= 4.7V
2
V
IN
= 5V
V
IN
3
= 5.3V
LT1268 • TA02
4
1
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LT1268BCQ#TRPBF Summary of contents
Page 1
S FEATURE Wide Input Voltage Range: 3.5V to 30V Low Quiescent Current: 7mA Internal 7.5A Switch Very Few External Parts Required Self-Protected Against Overloads Available in Standard and Surface Mount 5-Pin Packages Can Be Externally Synchronized (See LT1072 Data Sheet) ...
Page 2
LT1268B/LT1268 BSOLUTE Supply Voltage ....................................................... 30V Switch Output Voltage ............................................ 60V Feedback Pin Voltage (Transient, 1ms) ................ 15V Operating Junction Temperature Range Operating ............................................... 125 C Short-Circuit ......................................... 0 C ...
Page 3
... DUTY CYCLE (%) LT1268 • TPC01 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights 15V ...
Page 4
... LT/GP 0194 10K REV 0 • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1994 ...