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Linear Technology Electronic Components Datasheet

LT1614 Datasheet

Inverting 600kHz Switching Regulator

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FEATURES
s Better Regulation Than a Charge Pump
s 0.1Effective Output Impedance
s – 5V at 200mA from a 5V Input
s 600kHz Fixed Frequency Operation
s Operates with VIN as Low as 1V
s 1mA Quiescent Current
s Low Shutdown Current: 10µA
s Low-Battery Detector
s Low VCESAT Switch: 295mV at 500mA
U
APPLICATIO S
s MR Head Bias
s LCD Bias
s GaAs FET Bias
s Positive-to-Negative Conversion
LT1614
Inverting 600kHz
Switching Regulator
DESCRIPTIO
The LT®1614 is a fixed frequency, inverting mode switch-
ing reglator that operates from an input voltage as low as
1V. Utilizing a low noise topology, the LT1614 can gener-
ate a negative output down to – 24V from a 1V to 5V input.
Fixed frequency switching ensures a clean output free
from low frequency noise. The device contains a low-
battery detector with a 200mV reference and shuts down
to less than 10µA. No load quiescent current of the LT1614
is 1mA and the internal NPN power switch handles a
500mA current with a voltage drop of just 295mV.
High frequency switching enables the use of small induc-
tors and capacitors. Ceramic capacitors can be used in
many applications, eliminating the need for bulky tanta-
lum types.
The LT1614 is available in 8-lead MSOP or SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN
5V
+
L1
22µH
C1
33µF
100k
VIN SW
SHDN
LT1614
VC NFB
GND
1nF
C3
1µF
69.8k
24.9k
L2
22µH
D1
VOUT
– 5V
200mA
C2
33µF
C1, C2: AVX TAJB336M010
C3: TAIYO YUDEN EMK316BJ105MF
D1: MBR0520
L1, L2: MURATA LQH3C220
Figure 1. 5V to – 5V/200mA Converter
1614 TA01
5V to – 5V Converter Efficiency
90
80
70
60
50
40
3
10 30 100
LOAD CURRENT (mA)
300
1614 TA02
1


Linear Technology Electronic Components Datasheet

LT1614 Datasheet

Inverting 600kHz Switching Regulator

No Preview Available !

LT1614
ABSOLUTE AXI U RATI GS (Note 1)
VIN, SHDN, LBO Voltage ......................................... 12V
SW Voltage ............................................... – 0.4V to 30V
NFB Voltage ............................................................ – 3V
VC Voltage ................................................................ 2V
LBI Voltage ............................................ 0V VLBI 1V
Current into FB Pin .............................................. ±1mA
Junction Temperature ...........................................125°C
Operating Temperature Range
LT1614C ................................................. 0°C to 70°C
LT1614I ............................................. – 40°C to 85°C
Extended Commercial
Temperature Range (Note 2) .................. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NFB 1
VC 2
SHDN 3
GND 4
8 LBO
7 LBI
6 VIN
5 SW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER PART
NUMBER
LT1614CMS8
LT1614IMS8
MS8 PART MARKING
LTID
LTJB
TOP VIEW
NFB 1
VC 2
SHDN 3
GND 4
8 LBO
7 LBI
6 VIN
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 120°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1614CS8
LT1614IS8
S8 PART MARKING
1614
1614I
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Commercial Grade 0°C to 70°C. VIN = 1.5V, VSHDN = VIN unless
otherwise noted.
PARAMETER
Quiescent Current
Feedback Voltage
NFB Pin Bias Current (Note 3)
Reference Line Regulation
Minimum Input Voltage
Maximum Input Voltage
Error Amp Transconductance
Error Amp Voltage Gain
Switching Frequency
Maximum Duty Cycle
Switch Current Limit (Note 4)
CONDITIONS
VSHDN = 0V
VNFB = –1.24V
1V VIN 2V
2V VIN 6V
I = 5µA
MIN
q – 1.21
q – 2.5
q
q 500
73
q 70
0.75
TYP
1
5
– 1.24
– 4.5
0.6
0.3
0.92
16
100
600
80
80
1.2
MAX
2
10
– 1.27
–7
1.1
0.8
1
6
750
UNITS
mA
µA
V
µA
%/V
%/V
V
V
µmhos
V/V
kHz
%
%
A
2


Part Number LT1614
Description Inverting 600kHz Switching Regulator
Maker Linear Technology
PDF Download

LT1614 Datasheet PDF






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