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LTC1266-33

Description
Synchronous Regulator Controller for N- or P-Channel MOSFETs
File Size277KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1266-33 Overview

Synchronous Regulator Controller for N- or P-Channel MOSFETs

LTC1266
LTC1266-3.3/LTC1266-5
Synchronous Regulator
Controller for
N- or P-Channel MOSFETs
DESCRIPTIO
The LTC
®
1266 series is a family of synchronous switching
regulator controllers featuring automatic Burst Mode
TM
operation to maintain high efficiencies at low output
currents. These devices drive external power MOSFETs at
switching frequencies up to 400kHz using a constant off-
time current mode architecture providing constant ripple
current in the inductor. They can drive either an N-channel
or a P-channel topside MOSFET.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V to 18V (20V maximum).
Constant off-time architecture provides low dropout regu-
lation limited only by the R
DS(ON)
of the topside MOSFET
(when using the P-channel) and the resistance of the
inductor and current sense resistor.
The LTC1266 series combines synchronous switching for
maximum efficiency at high currents with an automatic
low current operating mode, called Burst Mode operation,
which reduces switching losses. Standby power is re-
duced to only 1mW at V
IN
= 5V (at I
OUT
= 0). Load currents
in Burst Mode operation are typically 0mA to 500mA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Ultra-High Efficiency: Over 95% Possible
Drives N-Channel MOSFET for High Current or
P-Channel MOSFET for Low Dropout
Pin Selectable Burst Mode Operation
1% Output Accuracy (LTC1266A)
Pin Selectable Phase of Topside Driver for Boost
or Step-Down Operation
Wide V
IN
Range: 3.5V to 20V
On-Chip Low-Battery Detector
High Efficiency Maintained over Large Current Range
Low 170µA Standby Current at Light Loads
Current Mode Operation for Excellent Line and Load
Transient Response
Logic Controlled Micropower Shutdown: I
Q
< 40µA
Short Circuit Protection
Synchronous Switching with Nonoverlaping Gate Drives
Available in 16-Pin Narrow SO Package
APPLICATI
s
s
s
s
s
S
Notebook and Palmtop Computers
Portable Instruments
Cellular Telephones
DC Power Distribution Systems
GPS Systems
TYPICAL APPLICATI
V
IN
4V TO 9V
D2
MBR0530T1
+
C
IN
100µF
×2
V
IN
PWR V
IN
LB
OUT
TDRIVE
SENSE
+
SENSE
BDRIVE
PGND
1000pF
N-CHANNEL
Si9410
N-CHANNEL
Si9410
LOW BAT OUT
C
B
0.1µF
L*
5µH
LOW BAT IN
LB
IN
PINV
LTC1266-3.3
0V = NORMAL
>1.5V = SHUTDOWN
R
C
470Ω
C
C
3300pF
SHDN
I
TH
C
T
BINH
SGND
R
SENSE
0.02Ω
EFFICIENCY (%)
100k
V
OUT
3.3V
5A
C
OUT
330µF
×
2
+
D1
MBRS130LT3
LTC1266 • TA01
C
T
180pF
*COILTRONICS CTXO212801
Figure 1. High Efficiency Step-Down Converter
U
UO
UO
LTC1266-3.3 Efficiency
100
V
IN
= 5V
95
90
85
80
0.01
0.1
1
LOAD CURRENT (A)
5
LTC1266 • TA02
1

LTC1266-33 Related Products

LTC1266-33 LTC1266CS-5 LTC1266CS-3.3 LTC1266ACS
Description Synchronous Regulator Controller for N- or P-Channel MOSFETs Synchronous Regulator Controller for N- or P-Channel MOSFETs Synchronous Regulator Controller for N- or P-Channel MOSFETs Synchronous Regulator Controller for N- or P-Channel MOSFETs
Brand Name - Linear Technology Linear Technology Linear Technology
Is it Rohs certified? - incompatible incompatible incompatible
Parts packaging code - SOIC SOIC SOIC
package instruction - SOP, SOP16,.25 0.150 INCH, PLASTIC, SOP-16 SOP, SOP16,.25
Contacts - 16 16 16
Manufacturer packaging code - S S S
Reach Compliance Code - _compli _compli _compli
ECCN code - EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types - SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode - CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology - CONSTANT OFF TIME CONSTANT OFF TIME CONSTANT OFF TIME
Maximum input voltage - 18 V 18 V 18 V
Minimum input voltage - 3.5 V 3.5 V 3.5 V
Nominal input voltage - 10 V 10 V 10 V
JESD-30 code - R-PDSO-G16 R-PDSO-G16 R-PDSO-G16
JESD-609 code - e0 e0 e0
length - 9.9 mm 9.9 mm 9.9 mm
Humidity sensitivity level - 1 1 1
Number of functions - 1 1 1
Number of terminals - 16 16 16
Maximum operating temperature - 70 °C 70 °C 70 °C
Maximum output current - 0.05 A 0.05 A 0.05 A
Nominal output voltage - 5 V 3.3 V 1.25 V
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - SOP SOP SOP
Encapsulate equivalent code - SOP16,.25 SOP16,.25 SOP16,.25
Package shape - RECTANGULAR RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) - 235 235 235
Certification status - Not Qualified Not Qualified Not Qualified
Maximum seat height - 1.752 mm 1.752 mm 1.752 mm
Maximum supply current (Isup) - 3 mA 3 mA 3 mA
surface mount - YES YES YES
Switch configuration - PUSH-PULL PUSH-PULL PUSH-PULL
Maximum switching frequency - 400 kHz 400 kHz 400 kHz
technology - CMOS CMOS CMOS
Temperature level - COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - GULL WING GULL WING GULL WING
Terminal pitch - 1.27 mm 1.27 mm 1.27 mm
Terminal location - DUAL DUAL DUAL
Maximum time at peak reflow temperature - 20 20 20
width - 3.9 mm 3.9 mm 3.9 mm
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