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Linear Technology Electronic Components Datasheet

LTC1701B Datasheet

1MHz Step-Down DC/DC Converters

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LTC1701B pdf
LTC1701/LTC1701B
1MHz Step-Down
DC/DC Converters in SOT-23
FEATURES
s Tiny 5-Lead SOT-23 Package
s Uses Tiny Capacitors and Inductor
s High Frequency Operation: 1MHz
s High Output Current: 500mA
s Low RDS(ON) Internal Switch: 0.28
s High Efficiency: Up to 94%
s Current Mode Operation for Excellent Line
and Load Transient Response
s Short-Circuit Protected
s Low Quiescent Current: 135µA (LTC1701)
s Low Dropout Operation: 100% Duty Cycle
s Ultralow Shutdown Current: IQ < 1µA
s Peak Inductor Current Independent of Inductor Value
s Output Voltages from 5V Down to 1.25V
U
APPLICATIO S
s PDAs/Palmtop PCs
s Digital Cameras
s Cellular Phones
s Portable Media Players
s PC Cards
s Handheld Equipment
DESCRIPTIO
The LTC®1701/LTC1701B are the industry’s first SOT-23
step-down, current mode, DC/DC converters. Intended for
low to medium power applications, they operate from 2.5V
to 5.5V input voltage range and switch at 1MHz, allowing
the use of tiny, low cost capacitors and inductors 2mm or
less in height. The output voltage is adjustable from 1.25V
to 5V. A built-in 0.28switch allows up to 0.5A of output
current at high efficiency. OPTI-LOOPTM compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors.
The LTC1701 incorporates automatic power saving Burst
ModeTM operation to reduce gate charge losses when the
load current drops below the level required for continuous
operation. The LTC1701B operates continuously to very
low load currents to provide low ripple at the expense of
light load efficiency. With no load, the LTC1701 draws only
135µA. In shutdown, both devices draw less than 1µA,
making them ideal for current sensitive applications.
Their small size and switching frequency enables a
complete DC/DC converter function to consume less than
0.3 square inches of PC board area.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
VIN
2.5V TO
5.5V
C1 +
10µF
VIN SW
R4
1M LTC1701
ITH/RUN
R3 GND
5.1k
C3
330pF
VFB
L1
4.7µH
D1
R2
121k
+
R1
121k
VOUT
(2.5V/
500mA)
C2
47µF
C1: TAIYO YUDEN JMK316BJ106ML
C2: SANYO POSCAP 6TPA47M
D1: MBRM120L
L1: SUMIDA CD43-4R7
1701 F01a
Figure 1. 2.5V/500mA Step-Down Regulator
Efficiency Curve
100
95
VIN = 3.3V
VOUT = 2.5V
90
85 LTC1701
80
75
LTC1701B
70
65
60
55
50
1 10 100
LOAD CURRENT (mA)
1000
1701 F01b
1


Linear Technology Electronic Components Datasheet

LTC1701B Datasheet

1MHz Step-Down DC/DC Converters

No Preview Available !

LTC1701B pdf
LTC1701/LTC1701B
ABSOLUTE AXI U RATI GS
(Note 1)
(Voltages Referred to GND Pin)
VIN Voltage (Pin 5).......................................– 0.3V to 6V
ITH/RUN Voltage (Pin 4) ..............................– 0.3V to 3V
VFB Voltage (Pin 3) ......................................– 0.3V to 3V
VIN – SW (Max Switch Voltage) ................8.5V to – 0.3V
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SW 1
GND 2
VFB 3
5 VIN
4 ITH/RUN
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 250°C/W
SEE THE APPLICATION
INFORMATION SECTION
ORDER PART
NUMBER
LTC1701ES5
LTC1701BES5
S5 PART
MARKING
LTKG
LTUD
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, RITH/RUN = 1Meg (from VIN to ITH/RUN) unless otherwise
specified. (Note 2)
SYMBOL
VIN
IFB
VFB
VLINE REG
VLOAD REG
VITH/RUN
IITH/RUN
ISW(PEAK)
RDS(ON)
PARAMETER
Operating Voltage Range
Feedback Pin Input Current
Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Supply Current (Note 4)
Active Mode
Sleep Mode
Shutdown
Run Threshold High
Run Threshold Low
Run Pullup Current
Peak Switch Current Threshold
Switch ON Resistance
ISW(LKG)
tOFF
Switch Leakage Current
Switch Off-Time
CONDITIONS
MIN
2.5
(Note 3)
(Note 3)
q 1.22
VIN = 2.5V to 5V (Note 3)
Measured in Servo Loop, VITH = 1.5V, (Note 3)
Measured in Servo Loop, VITH = 1.9V, (Note 3)
VFB = 0V
VFB = 1.4V (LTC1701 only)
VITH/RUN = 0V
ITH/RUN Ramping Down
ITH/RUN Ramping Up
VITH/RUN = 1V
VFB = 0V
VIN = 5V, VFB = 0V
VIN = 3.3V, VFB = 0V
VIN = 2.5V, VFB = 0V
VIN = 5V, VITH/RUN = 0V, VFB = 0V
0.3
50
0.9
400
TYP
1.25
0.04
0.01
– 0.80
MAX
5.5
± 0.1
1.28
0.1
0.70
– 1.50
UNITS
V
µA
V
%/V
%
%
185 300
135 200
0.25 1
1.4 1.6
0.6
100 300
1.1
0.28
0.30
0.35
0.01 1
500 600
µA
µA
µA
V
V
µA
A
µA
ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1701E/LTC1701BE 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: The LTC1701/LTC1701B are tested in a feedback loop which
servos VFB to the midpoint for the error amplifier without RITH/RUN = 1MHz
(VITH = 1.7V unless otherwise specified).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: TJ is calculated from the ambient TA and power dissipation PD
according to the following formula:
LTC1701ES5/LTC1701BES5: TJ = TA + (PD • 250°C/W)
2


Part Number LTC1701B
Description 1MHz Step-Down DC/DC Converters
Maker Linear
Total Page 12 Pages
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