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LT1611CS5 Datasheet

  • LT1611CS5

  • Inverting 1.4MHz Switching Regulator in SOT-23

  • 12頁

  • LINER

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LT1611
Inverting 1.4MHz Switching
Regulator in SOT-23
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Very Low Noise: 1mV
P鈥揚
Output Ripple
鈥?5V at 150mA from a 5V Input
Better Regulation Than a Charge Pump
Effective Output Impedance: 0.14鈩?/div>
Uses Tiny Capacitors and Inductors
Internally Compensated
Fixed Frequency 1.4MHz Operation
Low Shutdown Current: <1碌A(chǔ)
Low V
CESAT
Switch: 300mV at 300mA
Tiny 5-Lead SOT-23 Package
The LT
廬
1611 is the industry鈥檚 first inverting 5-lead SOT-23
current mode DC/DC converter. Intended for use in small,
low power applications, it operates from an input voltage
as low as 1.1V and switches at 1.4MHz, allowing the use
of tiny, low cost capacitors and inductors 2mm or less in
height. Its small size and high switching frequency enable
the complete DC/DC converter function to consume less
than 0.25 square inches of PC board area. Capable of
generating 鈥?5V at 150mA from a 5V supply or 鈥?5V at
100mA from a 3V supply, the LT1611 replaces nonregulated
鈥渃harge pump鈥?solutions in many applications.
The LT1611 operates in a dual inductor inverting topology
which filters the input side as well as the output side of the
DC/DC converter. Fixed frequency switching ensures a
clean output free from low frequency noise typically present
with charge pump solutions. No load quiescent current of
the LT1611 is 3mA, while in shutdown quiescent current
drops to 0.5碌A(chǔ). The 36V switch allows V
IN
to V
OUT
differential of up to 33V.
The LT1611 is available in the 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
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MR Head Bias
Digital Camera CCD Bias
LCD Bias
GaAs FET Bias
Positive-to-Negative Conversion
TYPICAL APPLICATIO
V
IN
5V
V
IN
L1A
22碌H
C2
1碌F
L1B
22碌H
D1
SW
LT1611
NFB
GND
R2
10k
R1
29.4k
1200pF
SHDN
C1
22碌F
+
V
OUT
鈥?V
150mA
C3
22碌F
V
OUT
20mV/DIV
AC COUPLED
LOAD CURRENT
C1: AVX TAJB226M010
C2: TAIYO YUDEN LMK212BJ105MG
C3: TAIYO YUDEN JMK325BJ226MM (1210 SIZE)
D1: MBR0520
L1: SUMIDA CLS62-220 OR 2脳 MURATA LQH3C220 (UNCOUPLED)
1611 TA01
150mA
50mA
100碌s/DIV
1611 F10
Figure 1. 5V to 鈥?5V, 150mA Low Noise Inverting DC/DC Converter
U
Transient Response
U
U
1

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