LTC1701ES5 Linear Technology, LTC1701ES5 Datasheet

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LTC1701ES5

Manufacturer Part Number
LTC1701ES5
Description
1MHz Step-Down DC/DC Converter in SOT-23
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
2.5V TO
C1: TAIYO YUDEN JMK316BJ106ML
C2: SANYO POSCAP 6TPA47M
D1: MBRM120L
L1: SUMIDA CD43-4R7
5.5V
Tiny 5-Lead SOT-23 Package
Uses Tiny Capacitors and Inductor
High Frequency Operation: 1MHz
High Output Current: 500mA
Low R
High Efficiency: Up to 94%
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Quiescent Current: 135 A
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Peak Inductor Current Independent of Inductor Value
Output Voltages from 5V Down to 1.25V
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Handheld Equipment
10 F
V
IN
C1
+
DS(ON)
Figure 1. Step-Down 2.5V/500mA Regulator
R4
1M
R3
5.1k
C3
330pF
Internal Switch: 0.28
V
I
TH
IN
U
/RUN
LTC1701
GND
SW
V
FB
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Q
U
< 1 A
D1
4.7 H
L1
R2
121k
R1
121k
+
C2
47 F
1701 F01
V
(2.5V/
500mA)
OUT
DC/DC Converter in SOT-23
DESCRIPTIO
The LTC
down, current mode, DC/DC converter. Intended for small
to medium power applications, it operates from 2.5V to
5.5V input voltage range and switches 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 0.28 switch allows up to 0.5A of output
current at high efficiency. OPTI-LOOP
allows the transient response to be optimized over a wide
range of loads and output capacitors.
The LTC1701 incorporates automatic power saving Burst
Mode
load current drops below the level required for continuous
operation. With no load, the converter draws only 135 A.
In shutdown, it draws less than 1 A, making it ideal for
current sensitive applications.
In dropout, the internal P-channel MOSFET switch is
turned on continuously, thereby maximizing battery life.
Its small size and switching frequency enables the com-
plete DC/DC converter function to consume less than 0.3
square inches of PC board area.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TM
operation to reduce gate charge losses when the
®
1701 is the industry’s first 5-lead SOT-23 step
100
95
90
85
80
75
70
1
V
IN
= 3.3V
U
1MHz Step-Down
Efficiency Curve
LOAD CURRENT (mA)
Final Electrical Specifications
10
December 1999
100
LTC1701
TM
1701 F01a
compensation
1000
1

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LTC1701ES5 Summary of contents

Page 1

... Figure 1. Step-Down 2.5V/500mA Regulator Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. DC/DC Converter in SOT-23 DESCRIPTIO ® ...

Page 2

... Note 3: The LTC1701 is tested in a feedback loop which servos V midpoint for the error amplifier (V Note 4: Dynamic supply current is higher due to the internal gate charge being delivered at the switching frequency. Note calculated from the ambient T J according to the following formula: LTC1701ES5 ORDER PART ...

Page 3

CTIO S SW (Pin 1): The Switch Node Connection to the Inductor. This pin swings from Schottky diode (external) IN voltage drop below ground. The cathode of the Schottky diode must be ...

Page 4

LTC1701 U OPERATIO The LTC1701 uses a contant off-time, current mode architecture. The operating frequency is then determined by the off-time and the difference between V To optimize efficiency, the LTC1701 automatically switches between continuous and Burst Mode operation. The ...

Page 5

U U APPLICATIO S I FOR ATIO where V is the output Schottky diode forward drop. D Accepting larger values of I allows the use of low L inductances, but results in higher output voltage ripple and greater core losses. ...

Page 6

LTC1701 U U APPLICATIO S I FOR ATIO Most LTC1701 circuits will be well served by either an MBR0520L or an MBRM120L. An MBR0520L is a good choice for I 500mA, as long as the output OUT(MAX) doesn’t need to ...

Page 7

U U APPLICATIO S I FOR ATIO Setting the Output Voltage The LTC1701 develops a 1.25V reference voltage between the feedback pin and the signal ground as shown in FB Figure 2. The output voltage is set by ...

Page 8

LTC1701 U U APPLICATIO S I FOR ATIO Soft-start can be implemented by ramping the voltage on I /RUN during start-up as shown in Figure 3(c). As the TH voltage on I /RUN ramps through its operating range the TH ...

Page 9

U U APPLICATIO S I FOR ATIO THERMAL CONSIDERATIONS The power handling capability of the device at high ambi- ent temperatures will be limited by the maximum rated junction temperature (125 C important to give careful consideration to ...

Page 10

LTC1701 U U APPLICATIO S I FOR ATIO 5. Keep sensitive components away from the SW pin. The input capacitor C , the compensation capacitor C IN the resistors R1, R2, R and R should be routed away C S ...

Page 11

U TYPICAL APPLICATIO OFF C1: AVX TAJA156M010R C2: AVX TAJA226M006R C4: TAIYO YUDEN LMK212BJ105MG C5: TAIYO YUDEN JMK212BJ475MG D1: MBRM120L L1: MURATA LQH3C4R7M24 PACKAGE DESCRIPTIO 0.35 – 0.55 (0.014 ...

Page 12

... Narrow SO and SSOP 8-Pin MSOP and SO Packages Q High Frequency, High Efficiency, 8-Pin MSOP SO-8, 2.65V V 10V 500mA IN OUT SO-8, 2.95V V 10V, V Output IN REF 550kHz, 6-Pin SOT-23 5A, 2.2V < V OUT 1701i LT/TP 1299 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1999 < 10V IN ...

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