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LT1500 Datasheet

Adaptive-Frequency Current Mode Switching Regulators

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LT1500/LT1501
Adaptive-Frequency
Current Mode Switching Regulators
FEATURES
s Low Noise Adaptive-Frequency Current Mode
Operation Avoids Low Frequency Noise at
Most Load Currents
s Can Be Externally Synchronized (LT1500)
s Micropower Quiescent Current: 200µA
s Shutdown Current: 8µA Typ
s Internal Loop Compensation
s Low-Battery Comparator Active in Shutdown
s Minimum Input Voltage: 1.8V Typ
s Additional Negative Voltage Feedback Pin (LT1500)
s Up to 500kHz Switching Frequency
s Uses Low Profile, Low Cost Surface Mount Inductors
U
APPLICATIONS
s Portable Instrumentation
s Battery Operated Systems
s PDA’s
s Standby Power
DESCRIPTION
The LT®1500 is an adaptive-frequency current mode step-
up switching regulator with an internal power switch that
is rated up to 700mA. In contrast to pulse skipping
switching regulators, the LT1500 uses a current mode
topology that provides lower noise operation and im-
proved efficiency. Only at very light loads is Burst ModeTM
activated to give high efficiency and micropower opera-
tion. High switching frequency (up to 500kHz) allows very
small inductors to be used, along with ceramic capacitors
if desired.
The LT1500 operates with input voltages from 1.8V to 15V
and has only 200µA operating current dropping to 8µA in
shutdown. A low-battery comparator is included which
stays alive in shutdown. A second output feedback pin
with negative polarity allows negative output voltages to
be regulated when the switcher is connected up as a Cuk
or a flyback converter.
Two package types are available. The LT1500 comes in a
14-pin SO package, with two options available for fixed
output (3.3V or 5V) or adjustable operation. A reduced
feature part, the LT1501, comes in the smaller 8-pin SO
package with internal frequency compensation. It is also
available in adjustable and fixed output voltage versions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
2-Cell to 5V Converter
D1
22µHMBR0520L
5V, 200mA
2 EACH
NiCd OR
ALKALINE
CELLS
301k
1%
+ 33µF*
6V
VIN ISENSE
SHDN
LT1501-5
LBI
SW
OUT
301k
1% LBO GND
1nF
+ 220µF**
10V
TANT
* AVX, TPSC107M006R0150
** AVX, TPSD107M010 R0100
SUMIDA CD73-220, CD54-220
OR CD43-220. SELECT ACCORDING
TO MAXIMUM LOAD CURRENT
LOW-BATTERY FLAG
(USE EXTERNAL PULL-UP)
LT1500/01 • TA01
1


Linear Technology Electronic Components Datasheet

LT1500 Datasheet

Adaptive-Frequency Current Mode Switching Regulators

No Preview Available !

LT1500/LT1501
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................ 20V
Switch Voltage (SW)................................................ 30V
Shutdown Voltage (SHDN) ...................................... 20V
ISENSE Voltage .......................................................... 20V
FB Voltage ................................................................. 5V
LBI Voltage ................................................................ 5V
LBO Voltage ............................................................. 15V
Operating Ambient Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ............................................ – 40°C to 85°C
Operating Junction Temperature Range
Commercial ........................................... 0°C to 100°C
Industrial .......................................... – 40°C to 100°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SHDN 1
VC 2
VIN 3
ISENSE 4
NC 5
GND 6
PGND 7
14 FB
13 NFB
12 SS
11 LBI
10 LBO
9 SYNC
8 SW
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 100°C, θJA = 100°C/ W
ORDER PART NUMBER
LT1500CS
LT1500IS
SHDN 1
VC 2
VIN 3
ISENSE 4
NC 5
GND 6
PGND 7
TOP VIEW
14 VOUT (3.3V/5V)
13 SELECT
12 SS
11 LBI
10 LBO
9 SYNC
8 SW
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 100°C, θJA = 100°C/ W
ORDER PART NUMBER
LT1500CS-3/5
LT1500IS-3/5
Consult factory for Military grade parts.
TOP VIEW
SHDN 1
VIN 2
ISENSE 3
GND 4
8 FB/OUT
7 LBI
6 LBO
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 100°C, θJA = 120°C/ W
ORDER PART NUMBER
LT1501CS8
LT1501CS8-3.3
LT1501CS8-5
LT1501IS8
LT1501IS8-3.3
LT1501IS8-5
ELECTRICAL CHARACTERISTICS TJ = 25°C, VIN = 2.3V unless otherwise noted.
PARAMETER
Feedback/Output Pin Reference Voltage
Reference Voltage Line Regulation
Feedback Pin Bias Current
CONDITIONS
LT1500/LT1501, TJ = 25°C
All Conditions (Note 6)
LT1500-3/5, Select Pin Open
All Conditions (Note 6)
LT1500-3/5, Select Pin Grounded
All Conditions (Note 6)
VIN = 2.3V to 15V
MIN TYP MAX
1.240 1.265 1.290
q 1.235
1.295
3.230 3.300 3.370
q 3.200
3.400
4.900 5.000 5.100
q 4.85
5.15
q 0.02 0.06
q 30 100
UNITS
V
V
V
V
V
V
%/V
nA
2


Part Number LT1500
Description Adaptive-Frequency Current Mode Switching Regulators
Maker Linear Technology
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LT1500 Datasheet PDF






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