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Linear Technology Electronic Components Datasheet

LT1612 Datasheet

Step-Down 800kHz PWM DC/DC Converter

No Preview Available !

LT1612
DESCRIPTIO
s Operates from Input Voltage As Low As 2VsInternal 0.7AThSeyLnTc®hr1o6n1o2usisSawnit8c0h0eksHz, synchronous step-down DC/
DC converter that operates from an input voltage as low
sUses Ceramic Input and Output Capacitorss
as 2V. Internal 0.45switches deliver output currents up
620mV Reference Voltages
to 500mA, and the 800kHz switching frequency allows the
800kHz Fixed Frequency SwitchingsProgrammabuleseBoufrstmMalol,dleowOpvearluaetiocneramic input and output capaci-
tors. Input voltage ranges from 5.5V down to 2V and
s Low Quiescent Current: 160µA
s 8-Lead MSOP or SO Package
output voltage can be set as low as the 620mV reference.
The device features Burst Mode
TM operation, keeping
efficiency high at light loads. Burst Mode operation can be
APPLICATIO SUFEATURES
defeated by pulling the MODE pin high, enabling constant
switching throughout the load range for low noise.
Portable Devices
s Lithium-Ion Step-Down Converterss
5V to 3.3V Conversion
s2-Cell Alkaline Step-Down Converters
No-load quiescent current is 160µA and shutdown current
is less than 1µA. The device is available in 8-lead SO and
MSOP packages.s
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIONU
BOOST
VIN
2V
SHDN VINSW
C1
10µF
MODE
FB
LT1612
V
CGND
33.2k
330pF
0.1µF
L1
10µH
100pF
R1
R2 215k
232k
1%
1%
VOUT
1.2V
500mA
C2
68µF
3.15V
C1: TAIYO-YUDEN JMK325BJ106MN
C2: PANASONIC EEFCDOF680R
L1: SUMIDA CD43-100
1612 F01a
Figure 1. 2V to 1.2V ConverterSynchronous, Step-Down
800kHz PWM
DC/DC Converter
Efficiency for LT1612 vs Linear Regulator
VOUT = 1.2V
90
80 IN = 2V
70 VIN = 3V
60
VIN = 2V (LINEAR)
50
40
30
10
VIN = 3V (LINEAR)
100
LOAD CURRENT (mA)
500
1612 • F01b
sn1612 1612fs
1
V


Linear Technology Electronic Components Datasheet

LT1612 Datasheet

Step-Down 800kHz PWM DC/DC Converter

No Preview Available !

LT1612
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (VIN) ............................................... 5.5V
SW Pin Voltage ....................................................... 5.5V
FB Pin Voltage ............................................... VIN + 0.3V
VC Pin Voltage ........................................................... 2V
SHDN Pin Voltage ................................................... 5.5V
MODE Pin Voltage .................................................. 5.5V
BOOST Pin Voltage ....................................... VIN + 5.5V
Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
VC 1
FB 2
VIN 3
GND 4
8 SHDN
7 MODE
6 BOOST
5 SW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 200°C/ W
ORDER PART
NUMBER
LT1612EMS8
MS8 PART MARKING
LTMS
Consult factory for parts specified with wider operating temperature ranges.
TOP VIEW
VC 1
FB 2
VIN 3
GND 4
8 SHDN
7 MODE
6 BOOST
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 120°C/ W
ORDER PART
NUMBER
LT1612ES8
S8 PART MARKING
1612
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C, VIN = VSHDN = 3V
SYMBOL PARAMETER
IQ Quiescent Current
VFB FB Voltage
FB Line Regulation
FB Pin Bias Current (Note 3)
gm Error Amplifier Transconductance
Min Input Voltage
Max Input Voltage
fOSC Oscillator Frequency
fOSC Line Regulation
Maximum Duty Cycle
Shutdown Threshold
CONDITIONS
MODE = 5V
MODE = 0V, Not Switching
SHDN = 0V
Minimum Voltage for Active
Maximum Voltage for Shutdown
MIN TYP MAX
q 12
q 160 220
q1
0.605 0.62 0.635
q 0.60 0.62 0.635
q 0.02 0.15
q 7 50
250
2
5.5
700
q 550
800 900
1100
1
85
q 80
90
q2
q
0.2
UNITS
mA
µA
µA
V
V
%/V
nA
µmhos
V
V
kHz
kHz
%/ V
%
%
V
V
2
sn1612 1612fs


Part Number LT1612
Description Step-Down 800kHz PWM DC/DC Converter
Maker Linear Technology
PDF Download

LT1612 Datasheet PDF






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