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Linear Technology Electronic Components Datasheet

LT1611 Datasheet

Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter

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LT1611
Inverting 1.4MHz Switching
Regulator in SOT-23
FEATURES
s Very Low Noise: 1mVP–P Output Ripple
s – 5V at 150mA from a 5V Input
s Better Regulation Than a Charge Pump
s Effective Output Impedance: 0.14
s Uses Tiny Capacitors and Inductors
s Internally Compensated
s Fixed Frequency 1.4MHz Operation
s Low Shutdown Current: <1µA
s Low VCESAT Switch: 300mV at 300mA
s Tiny 5-Lead SOT-23 Package
U
APPLICATIO S
s MR Head Bias
s Digital Camera CCD Bias
s LCD Bias
s GaAs FET Bias
s Positive-to-Negative Conversion
DESCRIPTIO
The LT®1611 is the industry’s 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 – 5V at 150mA from a 5V supply or – 5V at
100mA from a 3V supply, the LT1611 replaces nonregulated
“charge pump” 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 0.5µA. The 36V switch allows VIN to VOUT
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.
TYPICAL APPLICATIO
L1A
VIN 22µH
5V
VIN SW
+
C1
SHDN
LT1611
22µF
NFB
GND
C2
1µF
L1B
22µH
R1
29.4k
R2
10k
D1
1200pF
C1: AVX TAJB226M010
C2: TAIYO YUDEN LMK212BJ105MG
C3: TAIYO YUDEN JMK325BJ226MM (1210 SIZE)
D1: MBR0520
L1: SUMIDA CLS62-220 OR 2× MURATA LQH3C220 (UNCOUPLED)
VOUT
–5V
150mA
C3
22µF
VOUT
20mV/DIV
AC COUPLED
150mA
LOAD CURRENT
50mA
1611 TA01
Figure 1. 5V to – 5V, 150mA Low Noise Inverting DC/DC Converter
Transient Response
100µs/DIV
1611 F10
1


Linear Technology Electronic Components Datasheet

LT1611 Datasheet

Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter

No Preview Available !

LT1611
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage .............................................................. 10V
SW Voltage ................................................– 0.4V to 36V
NFB Voltage ............................................................. – 3V
Current into NFB Pin ............................................. ±1mA
SHDN Voltage .......................................................... 10V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Extended Commercial (Note 2) ........... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SW 1
GND 2
NFB 3
5 VIN
4 SHDN
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 256°C/W
ORDER PART
NUMBER
LT1611CS5
S5 PART MARKING
LTES
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.5V, VSHDN = VIN unless otherwise noted.
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
NFB Pin Bias Current
Feedback Voltage
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
Switch VCESAT
Switch Leakage Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Pin Bias Current
CONDITIONS
VNFB = –1.23V
VSHDN = 1.5V, Not Switching
VSHDN = 0V, VIN = 2V
VSHDN = 0V, VIN = 5V
1.5V VIN 10V
(Note 3)
ISW = 300mA
VSW = 5V
VSHDN = 3V
VSHDN = 0V
MIN
q – 2.7
q – 1.205
q 1.0
q 82
550
1
TYP
0.9
– 4.7
– 1.23
3
0.01
0.01
0.02
1.4
86
800
300
0.01
25
0
MAX
1.1
10
– 6.7
– 1.255
4.5
0.5
1.0
0.2
1.8
350
1
0.3
50
0.1
UNITS
V
V
µA
V
mA
µA
µA
%/V
MHz
%
mA
mV
µA
V
V
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: C grade device specifications are guaranteed over the 0°C to 70°C
temperature range. In addition, C grade device specifications are assured
over the – 40°C to 85°C temperature range by design or correlation, but
are not production tested.
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 LT1611
Description Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter
Maker Linear Technology
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LT1611 Datasheet PDF






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