LT1076HVCR#PBF Linear Technology, LT1076HVCR#PBF Datasheet

IC SWTCHNG REG STP-DWN 2A 7-DD

LT1076HVCR#PBF

Manufacturer Part Number
LT1076HVCR#PBF
Description
IC SWTCHNG REG STP-DWN 2A 7-DD
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Inverting, Flybackr
Datasheet

Specifications of LT1076HVCR#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
2.5 ~ 50 V
Current - Output
2A
Frequency - Switching
100kHz
Voltage - Input
8 ~ 64 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (7 leads + tab)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-

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FEATURES
APPLICATIO S
The LT
bipolar switching regulator which requires only a few
external parts for normal operation. The power switch, all
oscillator and control circuitry, and all current limit com-
DESCRIPTIO
10V TO 40V
TYPICAL APPLICATIO
5A Onboard Switch (LT1074)
Operates Up to 60V Input
100kHz Switching Frequency
Greatly Improved Dynamic Behavior
Available in Low Cost 5 and 7-Lead Packages
Only 8.5mA Quiescent Current
Programmable Current Limit
Micropower Shutdown Mode
Buck Converter with Output Voltage Range of 2.5V
to 50V
Tapped-Inductor Buck Converter with 10A Output
at 5V
Positive-to-Negative Converter
Negative Boost Converter
Multiple Output Buck Converter
+
®
1074 is a 5A (LT1076 is rated at 2A) monolithic
C3
200
V
µ
F
IN
GND
Basic Positive Buck Converter
LT1074
U
U
V
C
V
R3
2.7k
SW
FB
C2
0.01
µ
F
100
50
µ
MBR745*
µ
H (LT1074)
H (LT1076)
L1**
U
R1
2.8k
1%
R2
2.21k
1%
+
25V
C1
500
5V
5A
µ
F
**
*
USE MBR340 FOR LT1076
COILTRONICS #50-2-52 (LT1074)
PULSE ENGINEERING, INC.
HURRICANE
RIPPLE CURRENT RATING ≥ I
ponents, are included on the chip. The topology is a classic
positive “buck” configuration but several design innova-
tions allow this device to be used as a positive-to-negative
converter, a negative boost converter, and as a flyback
converter. The switch output is specified to swing 40V
below ground, allowing the LT1074 to drive a tapped-
inductor in the buck mode with output currents up to 10A.
The LT1074 uses a true analog multiplier in the feedback
loop. This makes the device respond nearly instanta-
neously to input voltage fluctuations and makes loop gain
independent of input voltage. As a result, dynamic behav-
ior of the regulator is significantly improved over previous
designs.
On-chip pulse by pulse current limiting makes the LT1074
nearly bust-proof for output overloads or shorts. The input
voltage range as a buck converter is 8V to 60V, but a self-
boot feature allows input voltages as low as 5V in the
inverting and boost configurations.
The LT1074 is available in low cost TO-220 or DD packages
with frequency pre-set at 100kHz and current limit at 6.5A
(LT1076 = 2.6A). A 7-pin TO-220 package is also available
which allows current limit to be adjusted down to zero. In
addition, full micropower shutdown can be programmed.
See Application Note 44 for design details.
A fixed 5V output, 2A version is also available. See LT1076-5.
#100-1-52 (LT1076)
#PE-92114 (LT1074)
#PE-92102 (LT1076)
#HL-AK147QQ (LT1074)
#HL-AG210LL (LT1076)
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1074•TA01
Step-Down Switching
OUT
/2
100
90
80
70
60
50
0
LT1074/LT1076
Buck Converter Efficiency
1
OUTPUT LOAD CURRENT (A)
L = 50µH TYPE 52 CORE
V
V
OUT
OUT
DIODE = MBR735
2
Regulator
= 12V, V = 20V
= 5V, V = 15V
LT1074
3
IN
IN
4
sn1074 1074fds
5
LT1074•TPC27
1
6

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LT1076HVCR#PBF Summary of contents

Page 1

... A 7-pin TO-220 package is also available which allows current limit to be adjusted down to zero. In addition, full micropower shutdown can be programmed. See Application Note 44 for design details. A fixed 5V output, 2A version is also available. See LT1076-5. , LTC and LT are registered trademarks of Linear Technology Corporation USE MBR340 FOR LT1076 ...

Page 2

LT1074/LT1076 ABSOLUTE AXI U RATI GS Input Voltage LT1074/ LT1076 .................................................. 45V LT1074HV/LT1076HV ......................................... 64V Switch Voltage with Respect to Input Voltage LT1074/ LT1076 .................................................. 64V LT1074HV/LT1076HV ......................................... 75V Switch Voltage with Respect to Ground Pin (V ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER CONDITIONS Switch “On” Voltage (Note 2) LT1074 LT1076 Switch “Off” Leakage LT1074 LT1076 Supply Current (Note 3) V 40V < Minimum Supply Voltage Normal Mode Startup Mode (Note ...

Page 4

LT1074/LT1076 ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: To calculate maximum switch “on” voltage at currents between low and high conditions, a linear interpolation may ...

Page 5

W BLOCK DIAGRA DESCRIPTIO A switch cycle in the LT1074 is initiated by the oscillator setting the R/S latch. The pulse that sets the latch also locks out the switch via gate G1. The effective width of this pulse is ...

Page 6

LT1074/LT1076 W U TYPICAL PERFOR A CE CHARACTERISTICS V Pin Characteristics C 200 150 V ADJUSTED FOR 100 –50 SLOPE ≈ 400kΩ –100 ≤ –150 ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current (Shutdown) 300 250 200 150 100 INPUT VOLTAGE (V) LT1074•TPC13 Reference Shift with Ripple Voltage –10 TRI WAVE –20 ...

Page 8

LT1074/LT1076 DESCRIPTIO S V PIN IN The V pin is both the supply voltage for internal control IN circuitry and one end of the high current switch important, especially at low input voltages , that ...

Page 9

DESCRIPTIO S current is well controlled even when switch duty cycle must be extremely low. Theoretical switch “on” time for a buck converter in continuous mode is OUT • V ...

Page 10

LT1074/LT1076 DESCRIPTIO S µ 300 A µ SHUTDOWN – PIN C1 2.3V + – C2 0.3V + Figure 5. Shutdown Circuitry Undervoltage Lockout Undervoltage lockout point is set by R1 and R2 in Figure 6. ...

Page 11

DESCRIPTIO S I PIN LIM The I pin is used to reduce current limit below the LIM preset value of 6.5A. The equivalent circuit for this pin is shown in Figure 8. TO LIMIT V IN CIRCUIT ...

Page 12

LT1074/LT1076 DESCRIPTIO S µ X1.8 2.21V ALL CURRENTS SHOWN ARE AT NULL CONDITION mid frequencies V • • 2π • high frequencies ...

Page 13

U TYPICAL APPLICATIO † 20V TO 35V + C3 200 50V * PULSE ENGINEERING #PE±65282 ** MOTOROLA MBR2030CTL † IF INPUT VOLTAGE IS BELOW 20V, MAXIMUM OUTPUT CURRENT WILL BE REDUCED. SEE AN44 + * = 1% ...

Page 14

LT1074/LT1076 PACKAGE DESCRIPTIO 0.320 – 0.350 0.420 – 0.480 (10.67 – 12.19) 0.060 0.256 (1.524) (6.502) 0.060 0.183 (1.524) (4.648) 0.075 (1.905) 0.300 (7.620) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK ...

Page 15

... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package ...

Page 16

... AT THE SEATING PLANE T7 (TO-220) 0399 Up to 1.25A, SO-8 OUT Up to 4.25A, SO-8/DD OUT Up to 0.5A, SO-8 OUT Up to 50A, Current Mode OUT =1.2V, TSSOP-16E, SO8 Package µF LT/CPI 0202 1.5K REV D • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994 sn1074 1074fds ...

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