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LT1072HVCT#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1072
1072fc
1.25A High Efficiency
Switching Regulator
■
Available in MiniDiP, TO-220, and TO-3 Packages
■
Wide Input Voltage Range 3V to 60V
■
Low Quiescent Current—6mA
■
Internal 1.25A Switch
■
Very Few External Parts Required
■
Self-Protected Against Overloads
■
Operates in Nearly All Switching Topologies
■
Shutdown Mode Draws Only 50µA Supply Current
■
Flyback-Regulated Mode has Fully Floating Outputs
■
Can be Externally Synchronized
The LT
®
1072 is a monolithic high power switching
regulator. It can be operated in all standard switching
configurations including buck, boost, flyback, forward,
inverting and “Cuk”. A high current, high efficiency switch
is included on the die along with all oscillator, control, and
protection circuitry. Integration of all functions allows the
LT1072 to be built in a standard 5-pin TO-3 or TO-220
power package as well as the 8-pin miniDlP. This makes it
extremely easy to use and provides “bust proof” operation
similar to that obtained with 3-pin linear regulators.
The LT1072 operates with supply voltages from 3V to 60V,
and draws only 6mA quiescent current. It can deliver load
power up to 20 watts with no external power devices. By
utilizing current-mode switching techniques, it provides
excellent AC and DC load and line regulation.
The LT1072 has many unique features not found even on
the vastly more difficult to use low power control chips
presently available. It uses an adaptive anti-sat switch
drive to allow very wide ranging load currents with no loss
in efficiency. An externally activated shutdown mode
reduces total supply current to 50µA typical for standby
operation. Totally isolated and regulated outputs can be
generated by using the optional “flyback regulation mode”
built into the LT1072, without the need for optocouplers or
extra transformer windings.
USER NOTE:
This data sheet is only intended to provide specifications, graphs, and a general functional
description of the LT1072. Application circuits are included to show the capability of the LT1072.
A complete design manual (AN-19) should be obtained to assist in developing new designs. This
manual contains a comprehensive discussion of both the LT1070 and the external components used
with it, as well as complete formulas for calculating the values of these components. The manual
can also be used for the LT1072 by factoring in the lower switch current rating.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
DESCRIPTIO
U
Boost Converter (5V to 12V)
TYPICAL APPLICATIO
U
10.7k
1.24k
LT1072
GND V
C
V
IN
V
SW
FB
1k
1µF
–
470µF
12V, 0.25A
*REQUIRED IF INPUT LEADS ≥ 2”
**PULSE ENGINEERING 52626
220µH**
5V
+
–
C3
25µF*
+
–
LT1072 • TA01
+
Maximum Output Power*
LT1072 • TA02
INPUT VOLTAGE (V)
0
*ROUGH GUIDE ONLY. BUCK MODE P
OUT
= 1A x V
OUT
.
MINIDIP OUTPUT POWER MAY BE LIMITED BY PACKAGE TEMPERATURE
RISE AT HIGH INPUT VOLTAGES OR HIGH DUTY CYCLES
POWER (W)
15
20
25
10
5
0
10
20
30 40
50
BUCK-BOOST
V
O
= 5V
BUCK-BOOST
V
O
= 30V
FLYBACK
ISOLATED
BOOST
■
Logic Supply 5V at 2.5A
■
5V Logic to ±15V Op Amp Supply
■
Offline Converter up to 50W
■
Battery Upconverter
■
Power lnverter (+ to –) or (– to +)
■
Fully Floating Multiple Outputs
■
Driver for High Current Supplies
APPLICATIO S
U
2
LT1072
1072fc
Supply Voltage
LT1072HV (See Note 1) ......................................... 60V
LT1072 (See Note 1) ............................................. 40V
Switch Output Voltage
LT1072HV ............................................................. 75V
LT1072 .................................................................. 65V
LT1072S8 .............................................................. 60V
Feedback Pin Voltage (Transient, 1ms) ................. ±15V
Operating Junction Temperature Range
LT1072HVM, LT1072M (OBSOLETE) .... –55°C to 150°C
LT1072HVC, LT1072C (Oper.)*............0°C to 100°C
LT1072HVC, LT1072C (Sh. Ckt.)* ........0°C to 125°C
LT1072HVI ....................................... –40°C to 125°C
Storage Temperature Range ............... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...............300°C
*Includes LT1072S8
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Note 1: Minimum switch “on” time for the LT1072 in current limit is
≈ 0.7µsec. This limits the maximum input voltage during short-circuit
conditions,
in the buck and inverting modes only,
to ≈ 40V. Normal
(unshorted) conditions are not affected. If the LT1072 is being operated in
the buck or inverting mode at high input voltages and short-circuit
conditions are expected, a resistor must be placed in series with the
inductor, as follows:
The value of the resistor is given by:
R = – R
L
(t) (f) (V
IN
) – V
f
I
(LIMIT)
t = Minimum “on” time of LT1072 in current limit, ≈ 0.7µs
f = Operating frequency (40kHz)
V
f
= Forward voltage of external catch diode at I
(LIMIT)
I
(LIMIT)
= Current limit of LT1072 (2A)
R
L
= Internal series resistance of inductor
OBSOLETE PACKAGE
OBSOLETE PACKAGE
Consider the S8 or N8 Packages for Alternate Source
T PACKAGE
5-LEAD TO-220
T
JMAX
= 100°C/W, θ
JC
= 8°C/W, θ
JA
= 50°C/W
V
IN
V
C
GND
FB
V
SW
FRONT VIEW
5
4
3
2
1
N PACKAGE
8-LEAD PDIP
T
JMAX
= 100°C, θ
JA
= 130°C/W
J PACKAGE
8-LEAD CERAMIC DIP
T
JMAX
= 150°C, θ
JA
= 100°C/W
1
2
3
4
8
7
6
5
TOP VIEW
GND
V
C
FB
NC
E2
V
SW
E1
V
IN
1
2
3
4
5
6
7
8
SW PACKAGE
16-LEAD PLASTIC SO WIDE
T
JMAX
= 100°C, θ
JC
= 130°C/W
16
15
14
13
12
11
10
9
NC
NC
GND
V
C
FB
NC
NC
NC
NC
NC
E2
V
SW
E1
V
IN
NC
NC
TOP VIEW
BOTTOM VIEW
K PACKAGE
4-LEAD TO-3 METAL CAN
T
JMAX
= 150°C, θ
JC
= 8°C/W, θ
JA
= 35°C/W
T
JMAX
= 100°C*, θ
JC
= 8°C/W, θ
JA
= 35°C/W
CASE IS
GND
V
C
1
4
2
3
FB
V
SW
V
IN
LT1072HVMK
LT1072MK
LT1072HVCK
LT1072CK
ORDER PART
NUMBER
ORDER PART
NUMBER
ORDER PART
NUMBER
ORDER PART
NUMBER
LT1072CT
LT1072HVCT
LT1072HVIT
LT1072CN8
LT1072CS8
LT1072MJ8
LT1072CJ8
LT1072CSW
LT1072 • POI01
1
2
3
4
8
7
6
5
TOP VIEW
E2
V
SW
E1
V
IN
GND
V
C
FB
NC
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 100°C, θ
JA
= 130°C/W
S8 PART
MARKING
1072
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
3
LT1072
1072fc
SYMBOL PARAMETER CONDITlONS MIN TYP MAX UNITS
V
REF
Reference Voltage Measured at Feedback Pin 1.224 1.244 1.264 V
V
C
= 0.8V ● 1.214 1.244 1.274 V
I
B
Feedback Input Current V
FB
= V
REF
350 750 nA
● 1100 nA
gm Error Amplifier ∆I
C
= ±25µA 3000 4400 6000 µmho
Transconductance
● 2400 7000 µmho
Error Amplifier Source or V
C
= 1.5V 150 200 350 µA
Sink Current
● 120 400 µA
Error Amplifier Clamp Hi Clamp, V
FB
= 1V 1.8 2.3 V
Voltage Lo Clamp, V
FB
= 1.5V 0.25 0.38 0.52 V
Reference Voltage Line 3V ≤ V
IN
≤ V
MAX
● 0.03 %/V
Regulation V
C
= 0.8V %/V
A
V
Error Amplifier Voltage Gain 0.9V ≤ V
C
≤ 1.4V 500 800 V/V
Minimum Input Voltage ● 2.6 3.0 V
I
Q
Supply Current 3V ≤ V
IN
≤ V
MAX
, V
C
= 0.6V 6 9 mA
Control Pin Threshold Duty Cycle = 0 0.8 0.9 1.08 V
● 0.6 1.25 V
Normal/Flyback Threshold on Feedback Pin 0.4 0.45 0.54 V
V
FB
Flyback Reference Voltage l
FB
= 50µA1516.3 17.6 V
● 14 18 V
Change in Flyback Reference Voltage 0.05 ≤ I
FB
≤ 1mA 4.5 6.8 8.5 V
Flyback Reference Voltage l
FB
= 50µA 0.01 0.03 %/V
Line Regulation 3V ≤ V
IN
≤ V
MAX
(Note 4) %/V
Flyback Amplifier Transconductance (gm) ∆I
C
= ±10µA 150 300 650 µmho
Flyback Amplifier Source V
C
= 0.6V Source ● 15 32 70 µA
and Sink Current I
FB
= 50µA Sink ● 25 40 70 µA
BV Output Switch Breakdown 3V ≤ V
IN
≤ V
MAX
LT1072 ● 65 90 V
Voltage I
SW
= 1.5mA LT1072HV ● 75 90 V
LT1072S8
● 60 80 V
V
SAT
Output Switch ON Resistance (Note 2) I
SW
= 1.25A ● 0.6 1 Ω
Control Voltage to Switch Current Transconductance 2 A/V
I
LIM
Switch Current Limit Duty Cycle = 50% T
J
≥ 25°C ● 1.25 3 A
Duty Cycle = 50% T
J
< 25°C ● 1.25 3.5 A
Duty Cycle = 80% (Note 3) ● 1 2.5 A
∆I
IN
Supply Current Increase 25 35 mA/A
∆I
SW
During Switch ON Time
f Switching Frequency 35 40 45 kHz
● 33 47 kHz
DC (max) Maximum Switch Duty Cycle 90 92 97 %
Flyback Sense Delay Time 1.5 µs
Shutdown Mode 3V ≤ V
IN
≤ V
MAX
100 250 µA
Supply Current V
C
= 0.05V
Shutdown Mode 3V ≤ V
IN
≤ V
MAX
100 150 250 mV
Threshold Voltage ● 50 300 mV
The ● denotes specifications which apply over the full operating
temperature range. Unless otherwise specified, V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Measured with V
C
in hi clamp, V
FB
= 0.8V.
Note 3: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by I
LIM
= 0.833 (2 – DC).
Note 4: V
MAX
= 55V for LT1072HV to avoid switch breakdown.
ELECTRICAL CHARACTERISTICS
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LT1072HVCT#PBF

Mfr. #:
Buy LT1072HVCT#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.25A Hi Eff Sw Reg
Lifecycle:
New from this manufacturer.
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