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LTC1159CG-5#PBF

Description
IC REG CTRLR BUCK 20SSOP
CategoryPower/power management    The power supply circuit   
File Size278KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC1159CG-5#PBF Overview

IC REG CTRLR BUCK 20SSOP

LTC1159CG-5#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP20,.3
Contacts20
Manufacturer packaging codeG
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyCONSTANT OFF TIME
Maximum input voltage40 V
Minimum input voltage4 V
Nominal input voltage12 V
JESD-30 codeR-PDSO-G20
JESD-609 codee3
length7.2 mm
Humidity sensitivity level1
Number of functions1
Number of terminals20
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current0.05 A
Nominal output voltage5 V
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP20,.3
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency250 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width5.3 mm
LTC1159
LTC1159-3.3/LTC1159-5
High Efficiency Synchronous
Step-Down Switching Regulators
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Operation from 4V to 40V Input Voltage
Ultrahigh Efficiency: Up to 95%
20
µ
A Supply Current in Shutdown
High Efficiency Maintained Over Wide Current Range
Current Mode Operation for Excellent Line and Load
Transient Response
Very Low Dropout Operation: 100% Duty Cycle
Short-Circuit Protection
Synchronous FET Switching for High Efficiency
Adaptive Non-Overlap Gate Drives
Available in SSOP and SO Packages
The LTC
®
1159 series is a family of synchronous step-down
switching regulator controllers featuring automatic Burst
Mode
TM
operation to maintain high efficiencies at low
output currents. These devices drive external complemen-
tary power MOSFETs at switching frequencies up to 250kHz
using a constant off-time current-mode architecture.
A separate pin and on-board switch allow the MOSFET
driver power to be derived from the regulated output
voltage providing significant efficiency improvement when
operating at high input voltages. The constant off-time
current-mode architecture maintains constant ripple cur-
rent in the inductor and provides excellent line and load
transient response. The output current level is user pro-
grammable via an external current sense resistor.
The LTC1159 automatically switches to power saving
Burst Mode operation when load current drops below
approximately 15% of maximum current. Standby current
is only 300µA while still regulating the output and shut-
down current is a low 20µA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
Step-Down and Inverting Regulators
Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
Industrial Power Distribution
Avionics Systems
Telecom Power Supplies
TYPICAL APPLICATIO
V
IN
CAP
0.15µF
V
IN
+
1N4148
P-GATE
0.1µF
P-DRIVE
EXTV
CC
LTC1159-5
0V = NORMAL
>2V = SHUTDOWN
3300pF
1k
C
T
300pF
SHDN1
SHDN2
I
TH
C
T
S-GND
SENSE
+
Si9435DY
C
IN
100µF
100V
+
3.3µF
V
CC
V
CC
EFFICIENCY (%)
D1
MBRS140T3
L*
33µH
3
R
SENSE
1
0.05Ω
2
4
V
OUT
5V/2A
SENSE
N-GATE
P-GND
0.01µF
+
Si9410DY
C
OUT
220µF
60
0.02
LTC1159 • F01
*COILTRONICS CTX33-4-MP
Figure 1. High Efficiency Step-Down Regulator
U
LTC1159-5 Efficiency
100
FIGURE 1 CIRCUIT
V
IN
= 10V
90
V
IN
= 20V
80
70
0.2
LOAD CURRENT (A)
2
LTC1159 • TA01
U
U
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