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LT1612ES8#TRPBF

P1-P3P4-P6P7-P9P10-P12
1
LT1612
sn1612 1612fs
■
Operates from Input Voltage As Low As 2V
■
Internal 0.7A Synchronous Switches
■
Uses Ceramic Input and Output Capacitors
■
620mV Reference Voltage
■
800kHz Fixed Frequency Switching
■
Programmable Burst Mode Operation
■
Low Quiescent Current: 160µA
■
8-Lead MSOP or SO Package
The LT
®
1612 is an 800kHz, synchronous step-down DC/
DC converter that operates from an input voltage as low
as 2V. Internal 0.45Ω switches deliver output currents up
to 500mA, and the 800kHz switching frequency allows the
use of small, low value ceramic input and output capaci-
tors. Input voltage ranges from 5.5V down to 2V and
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
defeated by pulling the MODE pin high, enabling constant
switching throughout the load range for low noise.
No-load quiescent current is 160µA and shutdown current
is less than 1µA. The device is available in 8-lead SO and
MSOP packages.
■
Portable Devices
■
Lithium-Ion Step-Down Converters
■
5V to 3.3V Conversion
■
2-Cell Alkaline Step-Down Converters
Figure 1. 2V to 1.2V Converter
Synchronous, Step-Down
800kHz PWM
DC/DC Converter
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
V
IN
2V
0.1µF
33.2k
R2
232k
1%
R1
215k
1%
L1
10µH
330pF
C1
10µF
C2
68µF
3.15V
C1: TAIYO-YUDEN JMK325BJ106MN
C2: PANASONIC EEFCDOF680R
L1: SUMIDA CD43-100
1612 F01a
V
OUT
1.2V
500mA
100pF
V
IN
SW
FB
BOOST
MODE
SHDN
V
C
GND
LT1612
LOAD CURRENT (mA)
EFFICIENCY (%)
90
80
70
60
50
40
30
10010 500
1612 • F01b
V
IN
= 2V (LINEAR)
V
IN
= 3V (LINEAR)
V
IN
= 2V
V
IN
= 3V
Efficiency for LT1612 vs Linear Regulator
V
OUT
= 1.2V
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATION
U
2
LT1612
sn1612 1612fs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current MODE = 5V ● 12 mA
MODE = 0V, Not Switching
● 160 220 µA
SHDN = 0V ● 1 µA
V
FB
FB Voltage 0.605 0.62 0.635 V
● 0.60 0.62 0.635 V
FB Line Regulation ● 0.02 0.15 %/V
FB Pin Bias Current (Note 3) ● 750 nA
g
m
Error Amplifier Transconductance 250 µmhos
Min Input Voltage 2V
Max Input Voltage 5.5 V
f
OSC
Oscillator Frequency 700 800 900 kHz
● 550 1100 kHz
f
OSC
Line Regulation 1%/V
Maximum Duty Cycle 85 90 %
● 80 %
Shutdown Threshold Minimum Voltage for Active
● 2V
Maximum Voltage for Shutdown ● 0.2 V
LT1612EMS8
T
JMAX
= 125°C, θ
JA
= 200°C/W
ORDER PART
NUMBER
Supply Voltage (V
IN
)............................................... 5.5V
SW Pin Voltage....................................................... 5.5V
FB Pin Voltage ............................................... V
IN
+ 0.3V
V
C
Pin Voltage ........................................................... 2V
SHDN Pin Voltage................................................... 5.5V
MODE Pin Voltage .................................................. 5.5V
(Note 1)
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ELECTRICAL CHARACTERISTICS
Consult factory for parts specified with wider operating temperature ranges.
BOOST Pin Voltage ....................................... V
IN
+ 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
LT1612ES8
ORDER PART
NUMBER
MS8 PART MARKING
T
JMAX
= 125°C, θ
JA
= 120°C/W
S8 PART MARKING
1612
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C, V
IN
= V
SHDN
= 3V
V
C
FB
V
IN
GND
1
2
3
4
8
7
6
5
SHDN
MODE
BOOST
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TOP VIEW
SHDN
MODE
BOOST
SW
V
C
FB
V
IN
GND
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
LTMS
3
LT1612
sn1612 1612fs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Pin Current SHDN = 2V
● 10 15 µA
SHDN = 5V ● 30 45 µA
BOOST Pin Current BOOST = V
IN
+ 2V 4 mA
Switch Current Limit (Note 4) Duty Cycle = 0% MODE = OV 600 710 900 mA
MODE = 5V 550 650 900 mA
Burst Mode Operation Current Limit MODE = 0V 180 mA
Switch Voltage Drop I
SW
= 500mA 200 280 mV
Rectifier Voltage Drop I
RECT
= 500mA 300 400 mV
SW Pin Leakage V
SW
= 5V, V
SHDN
= 0V ● 1 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1612E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C, V
IN
= V
SHDN
= 3V
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Bias current flows out of the FB pin.
Note 4: Duty cycle affects current limit due to slope compensation.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
FB Voltage vs Temperature
Quiescent Current vs Temperature
FB Pin Bias Current
TEMPERATURE (°C)
–50 –25 25 75
QUIESCENT CURRENT (µA)
50
190
180
170
160
150
140
130
120
110
100
1612 • G02
0 100
MODE = 0V
TEMPERATURE (°C)
–50
FB PIN CURRENT (nA)
–25
0
50 75
1612 • G03
100
0
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
25
TEMPERATURE (°C)
–50
FB VOLTAGE (V)
0.64
0.63
0.62
0.61
0.60
0.59
–25
02550
1612 • G01
75 100
P1-P3P4-P6P7-P9P10-P12

LT1612ES8#TRPBF

Mfr. #:
Buy LT1612ES8#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Sync, Buck 800kHz PWM DC/DC Conv
Lifecycle:
New from this manufacturer.
Delivery:
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