LT1959CR#TRPBF Linear Technology, LT1959CR#TRPBF Datasheet - Page 2

• Manufacturer Part Number: LT1959CR#TRPBF
• Description: IC SW REG STEP-DWN 500KHZ 7-DD
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1959CR#TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.21 ~ 38 V
• Current - Output: 4.5A
• Frequency - Switching: 500kHz
• Voltage - Input: 4.3 ~ 15 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: D²Pak, TO-263 (7 leads + tab)
• Dc To Dc Converter Type: Step Down
• Pin Count: 7 +Tab
• Input Voltage: 16V
• Output Voltage: 1.21 to 2.42V
• Switching Freq: 540kHz
• Output Current: 8.5A
• Package Type: DDPAK
• Output Type: Adjustable
• Switching Regulator: Yes
• Line Regulation: 0.03%/V
• Mounting: Surface Mount
• Input Voltage (min): 4V
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Compliant

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