LT1959 LINER [Linear Technology], LT1959 Datasheet - Page 2

• Manufacturer Part Number: LT1959
• Description: 4.5A, 500kHz Step-Down Switching Regulator
• Manufacturer: LINER [Linear Technology]

PACKAGE/ORDER
LT1959
Input Voltage .......................................................... 16V
BOOST Voltage ........................................................ 30V
BOOST Pin Above Input Voltage ............................. 15V
SHDN Pin Voltage ..................................................... 7V
FB Pin Voltage ....................................................... 3.5V
FB Pin Current ....................................................... 1mA
ABSOLUTE
temperature range, otherwise specifications are at T
otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER
Feedback Voltage (Adjustable)
Reference Voltage Line Regulation
Feedback Input Bias Current
Error Amplifier Voltage Gain
Error Amplifier Transconductance
V
Error Amplifier Source Current
Error Amplifier Sink Current
V
V
Switch Current Limit
Slope Compensation
2
C
C
C
WITH PACKAGE SOLDERED TO 0.5 SQUARE INCH
COPPER AREA OVER BACKSIDE GROUND PLANE OR
INTERNAL POWER PLANE.
TO > 40 C/W DEPENDING ON MOUNTING TECHNIQUES
Pin to Switch Current Transconductance
Pin Switching Threshold
Pin High Clamp
GND
TAB
IS
T
JMAX
7-LEAD PLASTIC DD
FRONT VIEW
R PACKAGE
= 150 C,
W
MAXIMUM
JA
7
6
5
4
3
2
1
JA
CAN VARY FROM 20 C/W
= 30 C/W
W W
FB
BOOST
V
GND
V
SHDN
V
IN
SW
C
INFORMATION
U
CONDITIONS
All Conditions
4.3V V
(Note 2)
V
V
Duty Cycle = 0
V
DC = 80%
FB
FB
C
RATINGS
I (V
Open, V
= 1.05V
= 1.35V
C
) = 10 A
W
IN
ORDER PART
FB
LT1959CR
LT1959IR
U
NUMBER
15V
A
= 1.05V, DC 50%
= 25 C, T
The
U
(Note 1)
J
= 25 C, V
denotes the specifications which apply over the full operating
SYNC Pin Voltage ..................................................... 7V
Operating Junction Temperature Range
Storage Temperature Range ................ – 65 C to 150 C
Lead Temperature (Soldering, 10 sec)................. 300 C
LT1959C ................................................ 0 C to 125 C
LT1959I ........................................... – 40 C to 125 C
IN
BOOST
GND**
**WITH (FUSED GND) GROUND PIN
= 5V, V
CONNECTED TO GROUND PLANE OR
LARGE LANDS
V
FB
IN
T
JMAX
1
2
3
4
8-LEAD PLASTIC SO
= 150 C,
C
S8 PACKAGE
= 1.5V, Boost = V
TOP VIEW
JA
= 80 C/W
8
7
6
5
V
SYNC
SHDN
V
SW
C
IN
1500
1000
1.19
–0.5
MIN
200
140
140
4.5
+ 5V, switch open, unless
S8 PART MARKING
2000
1.21
0.01
TYP
400
225
225
5.3
0.9
2.1
0.8
0
6
ORDER PART
LT1959CS8
LT1959IS8
NUMBER
1959
1959I
2700
3100
MAX
1.23
0.03
320
320
0.5
8.5
UNITS
%/ V
Mho
Mho
A/ V
V
A
A
A
V
V
A
A