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Linear Technology Electronic Components Datasheet

LT1506 Datasheet

4.5A/ 500kHz Step-Down Switching Regulator

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LT1506
4.5A, 500kHz Step-Down
Switching Regulator
FEATURES
s Constant 500kHz Switching Frequency
s Easily Synchronizable
s Operates with Input as Low as 4V
s Uses All Surface Mount Components
s Inductor Size Reduced to 1.8µH
s Saturating Switch Design: 0.07
s Shutdown Current: 20µA
s Cycle-by-Cycle Current Limiting
U
APPLICATIONS
s Portable Computers
s Battery-Powered Systems
s Battery Charger
s Distributed Power
DESCRIPTION
The LT®1506 is a 500kHz monolithic buck mode switching
regulator functionally identical to the LT1374 but optimized
for lower input voltage applications. It will operate over a
4V to 15V input range compared with 5.5V to 25V for the
LT1374. A 4.5A switch is included on the die along with all
the necessary oscillator, control and logic circuitry. High
switching frequency allows a considerable reduction in the
size of external components. The topology is current mode
for fast transient response and good loop stability. Both
fixed output voltage and adjustable parts are available.
A special high speed bipolar process and new design tech-
niques achieve high efficiency at high switching frequency.
Efficiency is maintained over a wide output current range
by keeping quiescent supply current to 4mA and by utiliz-
ing a supply boost capacitor to saturate the power switch.
The LT1506 fits into standard 7-pin DD and fused lead
SO-8 packages. Full cycle-by-cycle short-circuit protection
and thermal shutdown are provided. Standard surface
mount external parts are used, including the inductor and
capacitors. There is the optional function of shutdown or
synchronization. A shutdown signal reduces supply current
to 20µA. Synchronization allows an external logic level sig-
nal to increase the internal oscillator from 580kHz to 1MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V to 3.3V Down Converter
D2
1N914
INPUT
5V
10µF
C3
TO
+
50µF
CERAMIC
OPEN
OR
HIGH
= ON
C2
0.68µF
BOOST
VIN VSW
LT1506-3.3
SHDN
SENSE
GND VC
CC
1.5nF
L1
5µH OUTPUT
3.3V
4A
+
D1
MBRS330T3
C1
100µF, 10V
SOLID
TANTALUM
1506 TA01
Efficiency vs Load Current
90
VOUT = 3.3V
VIN = 5V
L = 10µH
85
80
75
70
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
LOAD CURRENT (A)
1506 TA02
1


Linear Technology Electronic Components Datasheet

LT1506 Datasheet

4.5A/ 500kHz Step-Down Switching Regulator

No Preview Available !

LT1506
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage .......................................................... 16V
BOOST Pin Above Input Voltage ............................. 15V
SHDN Pin Voltage ..................................................... 7V
FB Pin Voltage (Adjustable Part) ............................ 3.5V
FB Pin Current (Adjustable Part) ............................ 1mA
Sense Voltage (Fixed 3.3V Part) ............................... 5V
SYNC Pin Voltage ..................................................... 7V
Operating Junction Temperature Range
LT1506C ............................................... 0°C to 125° C
LT1506I ........................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
FRONT VIEW
7 FB OR SENSE*
6 BOOST
TAB 5 VIN
IS 4 GND
GND 3 VSW
2 SYNC OR SHDN*
1 VC
R PACKAGE
7-LEAD PLASTIC DD PAK
TJMAX = 125°C, θJA = 30°C/W
WITH PACKAGE SOLDERED TO 0.5 SQUARE INCH
COPPER AREA OVER BACKSIDE GROUND PLANE OR
INTERNAL POWER PLANE. θJA CAN VARY FROM 20°C/W
TO > 40°C/W DEPENDING ON MOUNTING TECHNIQUES
ORDER PART
NUMBER
LT1506CR
LT1506CR-3.3
LT1506CR-SYNC
LT1506CR-3.3 SYNC
LT1506IR
LT1506IR-3.3
LT1506IR-SYNC
LT1506IR-3.3 SYNC
TOP VIEW
VIN 1
BOOST
FB OR
SENSE*
GND**
2
3
4
8 VSW
7 SYNC
6 SHDN
5 VC
S8 PACKAGE
8-LEAD PLASTIC SO
θJA = 80°C/ W
**WITH FUSED (GND) GROUND PIN
CONNECTED TO GROUND PLANE OR
LARGE LANDS
ORDER PART
NUMBER
LT1506CS8
LT1506CS8-3.3
LT1506IS8
LT1506IS8-3.3
S8 PART MARKING
1506 1506I
150633 506I33
*Default is the adjustable output voltage device with FB pin and shutdown function. Option -3.3 replaces FB with SENSE pin for fixed 3.3V output
applications. -SYNC replaces SHDN with SYNC pin for applications requiring synchronization. Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
TJ = 25°C, VIN = 5V, VC = 1.5V, Boost = VIN + 5V, switch open, unless otherwise noted.
PARAMETER
Feedback Voltage (Adjustable)
Sense Voltage (Fixed 3.3V)
SENSE Pin Resistance
Reference Voltage Line Regulation
Feedback Input Bias Current
Error Amplifier Voltage Gain
Error Amplifier Transconductance
CONDITIONS
All Conditions
All Conditions
4.3V VIN 15V
(Notes 2, 8)
I (VC) = ±10µA (Note 8)
VC Pin to Switch Current Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
VC Pin Switching Threshold
VC Pin High Clamp
Switch Current Limit
Slope Compensation
VFB = 2.1V or VSENSE = 2.9V
VFB = 2.7V or VSENSE = 3.7V
Duty Cycle = 0
VC Open, VFB = 2.1V or VSENSE = 2.9V, DC 50%
DC = 80%
2
MIN TYP MAX
2.39 2.42 2.45
q 2.36
2.48
3.25 3.3 3.35
q 3.23
3.37
4 6.6 9.5
0.01 0.03
q 0.5 2
200 400
1500 2000 2700
q 1000
3100
5.3
q 140 225 320
q 140 225 320
0.9
2.1
q 4.5 6 8.5
0.8
UNITS
V
V
V
V
k
%/ V
µA
µMho
µMho
A/ V
µA
µA
V
V
A
A


Part Number LT1506
Description 4.5A/ 500kHz Step-Down Switching Regulator
Maker Linear Technology
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LT1506 Datasheet PDF





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