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Linear Technology Electronic Components Datasheet

LT1616 Datasheet

1.4MHz Step-Down Switching Regulator

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FEATURES
s Wide Input Range: 3.6V to 25V
s 5V at 400mA from 7V to 25V Input
s 3.3V at 400mA from 4.7V to 25V Input
s Fixed Frequency 1.4MHz Operation
s Uses Tiny Capacitors and Inductors
s Internally Compensated
s Low Shutdown Current: <1µA
s Low VCESAT Switch: 220mV at 300mA
s Tiny 6-Lead SOT-23 Package
U
APPLICATIO S
s Wall Transformer Regulation
s Local Logic Supply Conversion:
12V to 5V
12V or 5V to 3.3V, 2.5V or 1.8V
s Distributed Supply Regulation
s Digital Cameras
s Battery-Powered Equipment
LT1616
600mA, 1.4MHz Step-Down
Switching Regulator
in SOT-23
DESCRIPTIO
The LT®1616 is a current mode PWM step-down DC/DC
converter with internal 0.6A power switch, packaged in a
tiny 6-lead SOT-23. The wide input range of 3.6V to 25V
makes the LT1616 suitable for regulating a wide variety of
power sources, from 4-cell batteries and 5V logic rails to
unregulated wall transformers and lead-acid batteries. Its
high operating frequency allows the use of tiny, low cost
inductors and ceramic capacitors. With its internal com-
pensation eliminating additional components, a complete
400mA step-down regulator fits onto 0.15 square inches
of PC board area.
The constant frequency current mode PWM architecture
and stable operation with ceramic capacitors results in
low, predictable output ripple. Current limiting provides
protection against shorted outputs. The low current (<1µA)
shutdown provides complete output disconnect, enabling
easy power management in battery-powered systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
3.3V Step-Down Converter
VIN
4.5V TO 25V
OFF ON
5
VIN
1
BOOST
LT1616
4
SHDN
6
SW
GND FB R1
2 3 16.5k
C1 R2
1µF 10k
D2
C3 L1
0.01µF 10µH
D1
C1: TAIYO-YUDEN TMK316BJ105
C2: TAIYO-YUDEN JMK316BJ106ML
D1: ON SEMICONDUCTOR MBR0530
D2: 1N4148
L1: SUMIDA CR43-100
VOUT
3.3V
300mA: VIN = 4.5V TO 25V
400mA: VIN = 4.7V TO 25V
C2
10µF
1616 TA01
100
90
80
70
60
50
40
30
0
Efficiency
VIN = 5V VIN = 12V
VIN = 20V
100 200 300 400
LOAD CURRENT (mA)
500
1616 G02
1


Linear Technology Electronic Components Datasheet

LT1616 Datasheet

1.4MHz Step-Down Switching Regulator

No Preview Available !

LT1616
ABSOLUTE AXI U RATI GS
(Note 1)
Input Voltage (VIN) ................................................. 25V
BOOST Pin Voltage ................................................. 35V
BOOST Pin Above SW Pin ...................................... 25V
SHDN Pin ............................................................... 25V
FB Voltage ................................................................ 6V
Current Into FB Pin ............................................... ±1mA
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
BOOST 1
GND 2
FB 3
TOP VIEW
6 SW
5 VIN
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 250°C/ W
ORDER PART
NUMBER
LT1616ES6
S6 PART MARKING
LTNB
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 10V, VBOOST = 15V, unless otherwise noted. (Note 2)
PARAMETER
Undervoltage Lockout
Feedback Voltage
FB Pin Bias Current
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
Frequency Shift Threshold on FB Pin
Maximum Duty Cycle
Switch Current Limit
Switch VCESAT
Switch Leakage Current
Minimum Boost Voltage Above Switch
BOOST Pin Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Bias Current
CONDITIONS
VFB = Measured VREF + 10mV
Not Switching
VSHDN = 0V
VIN = 5V to 25V
VFB = 1.1V
fSW = 700kHz
(Note 3)
ISW = 300mA
ISW = 300mA
ISW = 300mA
VSHDN = 3V
VSHDN = 0V
MIN TYP MAX
3.35 3.6
q 1.225 1.25 1.275
q 150 600
1.9 2.5
0.01 2
0.005
q 1 1.4 1.8
0.44
q 80
87
630 850
220 350
10
1.6 2.5
7 12
1.8
0.4
8 15
0.01 0.1
UNITS
V
V
nA
mA
µA
%/V
MHz
V
%
mA
mV
µA
V
mA
V
V
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LT1616E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
2


Part Number LT1616
Description 1.4MHz Step-Down Switching Regulator
Maker Linear Technology
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LT1616 Datasheet PDF






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