LTC1701/LTC1701B
1MHz Step-Down
DC/DC Converters in SOT-23
U
FEATURES
DESCRIPTIO
The LTC®1701/LTC1701B are the industry’s first SOT-23
step-down,currentmode,DC/DCconverters.Intendedfor
lowtomediumpowerapplications,theyoperatefrom2.5V
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 0.28Ω switch 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.
■
Tiny 5-Lead SOT-23 Package
■
Uses Tiny Capacitors and Inductor
■
High Frequency Operation: 1MHz
■
High Output Current: 500mA
■
Low RDS(ON) Internal Switch: 0.28Ω
■
High Efficiency: Up to 94%
■
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
■
■
Low Quiescent Current: 135µA (LTC1701)
■
Low Dropout Operation: 100% Duty Cycle
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
lightloadefficiency.Withnoload,theLTC1701drawsonly
135µA. In shutdown, both devices draw less than 1µA,
making them ideal for current sensitive applications.
■
Ultralow Shutdown Current: IQ < 1µA
■
Peak Inductor Current Independent of Inductor Value
■
Output Voltages from 5V Down to 1.25V
U
APPLICATIO S
■
PDAs/Palmtop PCs
■
Digital Cameras
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.
■
Cellular Phones
■
Portable Media Players
■
PC Cards
■
Handheld Equipment
U
TYPICAL APPLICATION
Efficiency Curve
L1
4.7µH
V
V
OUT
100
IN
2.5V TO
5.5V
(2.5V/
V
SW
V
V
= 3.3V
= 2.5V
IN
IN
OUT
95
90
85
80
75
70
65
60
55
50
500mA)
D1
R4
R2
LTC1701
1M
121k
LTC1701
GND
+
C1
10µF
+
C2
47µF
I
TH
/RUN
V
FB
R3
5.1k
C3
R1
121k
LTC1701B
330pF
C1: TAIYO YUDEN JMK316BJ106ML
C2: SANYO POSCAP 6TPA47M
D1: MBRM120L
1701 F01a
L1: SUMIDA CD43-4R7
1
10
100
1000
LOAD CURRENT (mA)
Figure 1. 2.5V/500mA Step-Down Regulator
1701 F01b
1
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