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LT1767EMS8E-5#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
1
1767fb
For more information www.linear.com/LT1767
Typical applicaTion
DescripTion
Monolithic 1.5A, 1.25MHz
Step-Down Switching Regulators
L, LT , LT C , LT M , 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.
FeaTures
applicaTions
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 0.22 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*
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.
n
DSL Modems
n
Portable Computers
n
Wall Adapters
n
Battery-Powered Systems
n
Distributed Power
Efficiency vs Load Current
12V to 3.3V Step-Down Converter
BOOST
LT1767-3.3
V
IN
OUTPUT
3.3V
1.2A*
V
IN
12V
1767 TA01
C2
0.1µF
C
C
1.5nF
R
C
4.7k
D1
UPS120
C1
10µF
CERAMIC
C3
2.2µF
CERAMIC
D2
CMDSH-3
L1
5µH
V
SW
FBSHDN
OPEN
OR
HIGH
= ON
GND
V
C
SYNC
*MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.
LOAD CURRENT (A)
0
0.2 0.4 0.6 0.8 1 1.2 1.4
EFFICIENCY (%)
1767 TA01a
95
90
85
80
75
70
V
IN
= 10V
V
OUT
= 5V
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
2
1767fb
For more information www.linear.com/LT1767
pin conFiguraTion
absoluTe MaxiMuM raTings
(Note 1)
Input Voltage ........................................................... 25V
BOOST Pin Above SW ............................................. 20V
Max BOOST Pin Voltage ............................................ 35V
SHDN Pin ................................................................. 25V
FB Pin Voltage ........................................................... 6V
FB Pin Current ......................................................... 1mA
SYNC Pin Current ................................................... 1mA
Operating Junction Temperature Range (Note 2)
LT1767E ........................................... –40°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................ 300°C
1
2
3
4
BOOST
V
IN
SW
GND
8
7
6
5
SYNC
V
C
FB
SHDN
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 110°C/W
GROUND PIN CONNECTED TO LARGE COPPER AREA
1
2
3
4
BOOST
V
IN
SW
GND
8
7
6
5
SYNC
V
C
FB
SHDN
TOP VIEW
MS8E PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 40°C/W
GROUND PIN CONNECTED TO LARGE COPPER AREA ON PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1767EMS8#PBF LT1767EMS8#TRPBF LTLS 8-Lead Plastic MSOP –40°C to 125°C
LT1767EMS8-1.8#PBF LT1767EMS8-1.8#TRPBF LTW G 8-Lead Plastic MSOP –40°C to 125°C
LT1767EMS8-2.5#PBF LT1767EMS8-2.5#TRPBF LTW D 8-Lead Plastic MSOP –40°C to 125°C
LT1767EMS8-3.3#PBF LT1767EMS8-3.3#TRPBF LTW E 8-Lead Plastic MSOP –40°C to 125°C
LT1767EMS8-5#PBF LT1767EMS8-5#TRPBF LTW F 8-Lead Plastic MSOP –40°C to 125°C
LT1767EMS8E#PBF LT1767EMS8E#TRPBF LTZG 8-Lead Plastic MSOP, Exposed Pad –40°C to 125°C
LT1767EMS8E-1.8#PBF LT1767EMS8E-1.8#TRPBF LTZH 8-Lead Plastic MSOP, Exposed Pad –40°C to 125°C
LT1767EMS8E-2.5#PBF LT1767EMS8E-2.5#TRPBF LTZJ 8-Lead Plastic MSOP, Exposed Pad –40°C to 125°C
LT1767EMS8E-3.3#PBF LT1767EMS8E-3.3#TRPBF LTZK 8-Lead Plastic MSOP, Exposed Pad –40°C to 125°C
LT1767EMS8E-5#PBF LT1767EMS8E-5#TRPBF LTZL 8-Lead Plastic MSOP, Exposed Pad –40°C to 125°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
3
1767fb
For more information www.linear.com/LT1767
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Switch Current Limit T
A
= 0°C to 125°C
T
A
= < 0°C
1.5
1.3
2 3
3
A
A
Oscillator Frequency 3.3V < V
IN
< 25V
l
1.1
1.1
1.25 1.4
1.5
MHz
MHz
Switch On Voltage Drop I
SW
= –1.5A, 0°C ≤ T
A
≤ 125°C and –1.3A, T
A
< 0°C
l
330 400
500
mV
mV
V
IN
Undervoltage Lockout (Note 3)
l
2.47 2.6 2.73 V
V
IN
Supply Current V
FB
= V
NOM
+ 17%
l
1 1.3 mA
Shutdown Supply Current V
SHDN
= 0V, V
IN
= 25V, V
SW
= 0V
l
6 20
45
µA
µA
Feedback Voltage 3V < V
IN
< 25V, 0.4V < V
C
< 0.9V
(Note 3)
LT1767 (Adj)
l
1.182
1.176
1.2 1.218
1.224
V
V
LT1767-1.8
l
1.764 1.8 1.836 V
LT1767-2.5
l
2.45 2.5 2.55 V
LT1767-3.3
l
3.234 3.3 3.366 V
LT1767-5
l
4.9 5 5.1 V
FB Input Current LT1767 (Adj)
l
–0.25 –0.5 µA
FB Input Resistance LT1767-1.8
LT1767-2.5
LT1767-3.3
LT1767-5
l
l
l
l
10.5
14.7
19
29
15
21
27.5
42
21
30
39
60
kΩ
kΩ
kΩ
kΩ
Error Amp V
oltage Gain 0.4V < V
C
< 0.9V 150 350
Error Amp Transconductance ∆I
VC
= ±10µA
l
500 850 1300 µMho
V
C
Pin Source Current V
FB
= V
NOM
– 17%
l
80 120 160 µA
V
C
Pin Sink Current V
FB
= V
NOM
+ 17%
l
70 110 180 µA
V
C
Pin to Switch Current Transconductance 2.5 A/V
V
C
Pin Minimum Switching Threshold Duty Cycle = 0% 0.35 V
V
C
Pin 1.5A I
SW
Threshold 0.9 V
Maximum Switch Duty Cycle V
C
= 1.2V, I
SW
= 400mA
l
85
80
90 %
%
Minimum Boost V
oltage Above Switch I
SW
= –1.5A, 0°C ≤ T
A
≤ 125°C and –1.3A, T
A
< 0°C
l
1.8 2.7 V
Boost Current I
SW
= –0.5A (Note 4)
I
SW
= –1.5A, 0°C ≤ T
A
≤ 125°C and –1.3A, T
A
< 0°C (Note 4)
l
l
10
30
15
45
mA
mA
SHDN Threshold V
oltage
l
1.27 1.33 1.40 V
SHDN Input Current (Shutting Down) SHDN = 60mV Above Threshold
l
–7 –10 –13 µA
SHDN Threshold Current Hysteresis SHDN = 100mV Below Threshold
l
4 7 10 µA
SYNC Threshold Voltage 1.5 2.2 V
SYNC Input Frequency 1.5 2 MHz
SYNC Pin Resistance I
SYNC
= 1mA 20 kΩ
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
C
= 0.8V, Boost = V
IN
+ 5V, SHDN, SYNC and switch open
unless otherwise noted.
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LT1767EMS8E-5#PBF

Mfr. #:
Buy LT1767EMS8E-5#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.5A, 1.25MHz Step-dn Converter
Lifecycle:
New from this manufacturer.
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