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LTC3448

Description
1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode
File Size275KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3448 Overview

1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode

LTC3448
1.5MHz/2.25MHz, 600mA
Synchronous Step-Down
Regulator with LDO Mode
DESCRIPTIO
The LTC
®
3448 is a high efficiency, monolithic, synchronous
buck regulator using a constant frequency, current mode
architecture. Supply current during operation is only 32µA
(linear regulator mode) and drops to <1µA in shutdown. The
2.5V to 5.5V input voltage range makes the LTC3448 ide-
ally suited for single Li-Ion battery-powered applications.
100% duty cycle provides low dropout operation, extend-
ing battery life in portable systems. At moderate output load
levels, PWM pulse skipping mode operation provides very
low output ripple voltage for noise sensitive applications.
The LTC3448 automatically switches into linear regulator
operation at very low load currents to maintain <5mV
P-P
output voltage ripple. Supply current in this mode is
typically 32µA. The switch to linear regulator mode occurs
at a threshold of 3mA. Linear regulator operation can be set
to on, off or automatic turn on/off.
Switching frequency is selectable at either 1.5MHz or
2.25MHz, allowing the use of small surface mount induc-
tors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The LTC3448 is available in a low
profile 3mm
×
3mm DFN package or thermally enhanced
8-lead MSOP.
FEATURES
High Efficiency: Up to 96%
Very Low Quiescent Supply Current: 32
µ
A During
Linear Regulator Operation
600mA Output Current (Buck Converter)
Optionally Operates as Linear Regulator Below
3mA—External or Automatic ON/OFF
2.5V to 5.5V Input Voltage Range
1.5MHz or 2.25MHz Constant Frequency Operation
or External Synchronization
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (3mm
×
3mm) 8-Lead DFN and 8-Lead
MSOP Packages
APPLICATIO S
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815,
6498466, 6611131. Others pending.
TYPICAL APPLICATIO
V
IN
2.5V TO 5.5V
C
IN
4.7µF
V
IN
Efficiency and Power Loss vs Load Current
100
90
80
70
EFFICIENCY (%)
V
IN
= 3.6V
V
OUT
= 1.5V
T
A
= 25°C
1
1.5V High Efficiency Regulator with Automatic LDO Mode
2.2µH
SW
474k
C
OUT
4.7µF
V
OUT
RUN
LTC3448
MODE
V
FB
FREQ
SYNC
GND
V
OUT
1.5V
22pF
60
50
40
30
EFFICIENCY
POWER LOSS
0.01
316k
20
10
0
0.0001
3448 TA01a
U
U
U
0.1
POWER LOSS (W)
0.001
0.0001
0.001
0.01
0.1
LOAD CURRENT (A)
1
23448 TA01b
3448f
1

LTC3448 Related Products

LTC3448 LTC3448EDD LTC3448EMS8E
Description 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode
Brand Name - Linear Technology Linear Technology
Is it Rohs certified? - incompatible incompatible
Maker - Linear ( ADI ) Linear ( ADI )
Parts packaging code - DFN MSOP
package instruction - HVSSON, SOLCC8,.11,20 HTSSOP, TSSOP8,.19
Contacts - 8 8
Manufacturer packaging code - DD MS8E
Reach Compliance Code - _compli _compli
ECCN code - EAR99 EAR99
Analog Integrated Circuits - Other Types - SWITCHING REGULATOR SWITCHING REGULATOR
control mode - CURRENT-MODE CURRENT-MODE
Control Technology - PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage - 5.5 V 5.5 V
Minimum input voltage - 2.5 V 2.5 V
Nominal input voltage - 3.6 V 3.6 V
JESD-30 code - S-PDSO-N8 S-PDSO-G8
JESD-609 code - e0 e0
length - 3 mm 3 mm
Humidity sensitivity level - 1 1
Number of functions - 1 1
Number of terminals - 8 8
Maximum operating temperature - 70 °C 70 °C
Maximum output current - 0.8 A 0.8 A
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - HVSSON HTSSOP
Encapsulate equivalent code - SOLCC8,.11,20 TSSOP8,.19
Package shape - SQUARE SQUARE
Package form - SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) - 235 235
Certification status - Not Qualified Not Qualified
Maximum seat height - 0.8 mm 1.1 mm
surface mount - YES YES
Switch configuration - BUCK BUCK
Maximum switching frequency - 2700 kHz 2700 kHz
technology - CMOS CMOS
Temperature level - COMMERCIAL COMMERCIAL
Terminal surface - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - NO LEAD GULL WING
Terminal pitch - 0.5 mm 0.65 mm
Terminal location - DUAL DUAL
Maximum time at peak reflow temperature - 20 20
width - 3 mm 3 mm
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