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LT1071HVIT#PBF

P1-P3P4-P6P7-P9P10-P12
10701fe
1
LT1070/LT1071
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
TYPICAL APPLICATIO
U
5A and 2.5A High Efficiency
Switching Regulators
■
Wide Input Voltage Range: 3V to 60V
■
Low Quiescent Current: 6mA
■
Internal 5A Switch (2.5A for LT1071)
■
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
■
Comes in Standard 5-Pin TO-220 Package
■
Can be Externally Synchronized (Consult Factory)
The LT
®
1070/LT1071 are monolithic high power switch-
ing regulators. They can be operated in all standard switch-
ing configurations including buck, boost, flyback, for-
ward, 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 func-
tions allows the LT1070/LT1071 to be built in a standard
5-pin T0-220 power package. This makes it extremely
easy to use and provides “bust proof” operation similar to
that obtained with 3-pin linear regulators.
The LT1070/LT1071 operate with supply voltages from 3V
to 60V, and draw only 6mA quiescent current. They can
deliver load power up to 100W with no external power
devices. By utilizing current mode switching techniques,
they provide excellent AC and DC load and line regulation.
The LT1070/LT1071 have many unique features not found
even on the vastly more difficult to use low power control
chips presently available. They use adaptive antisat 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 LT1070/LT1071, 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 LT1070/LT1071. Application circuits are included to show the capability of the
LT1070/LT1071. A complete design manual (AN19) 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 LT1071 by factoring in the lower switch current
rating. A second Application Note, AN25, which details off-line applications is available.
+
R1
10.7k
1%
R2
1.24k
1%
1070/71 TA01
12V
1A
R3
1k
C1
1µF
C2
1000µF
+
C3*
100µF
L1**
150µH
D1
5V
V
SW
V
C
V
IN
LT1070
GND
FB
C3
100µF
L2
10µH
OUTPUT
FILTER
*
**
REQUIRED IF INPUT LEADS ≥ 2"
PULSE ENGINEERING 92113
INPUT VOLTAGE (V)
0
POWER (W)**
60
80
100
40
1070/71 TA02
40
20
0
10
20
30
50
BOOST
BUCK/BOOST
V
O
= 30V
FLYBACK
ISOLATED
BUCK/BOOST
V
O
= 5V
ROUGH GUIDE ONLY. BUCK MODE P
OUT
= 5A • V
OUT
.
SPECIAL TOPOLOGIES DELIVER MORE POWER
DIVIDE VERTICAL POWER SCALE BY 2 FOR LT1071
*
**
Maximum Output Power*
Boost Converter (5V to 12V)
■
Logic Supply 5V at 10A
■
5V Logic to ±15V Op Amp Supply
■
Off-Line Converter Up to 200W
■
Battery Upconverter
■
Power Inverter (+ to –) or (– to +)
■
Fully Floating Multiple Outputs
■
For Lower Current Applications, See the LT1072
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LT1070/LT1071
10701fe
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Reference Voltage Measured at Feedback Pin, V
C
= 0.8V 1.224 1.244 1.264 V
● 1.214 1.244 1.274 V
I
B
Feedback Input Current V
FB
= V
REF
350 750 nA
● 1100 nA
g
m
Error Amplifier Transconductance ∆I
C
= ±25µA 3000 4400 6000 µmho
● 2400 7000 µmho
Error Amplifier Source or Sink Current V
C
= 1.5V 150 200 350 µA
● 120 400 µA
Error Amplifier Clamp Voltage Hi Clamp, V
FB
= 1V 1.80 2.30 V
Lo Clamp, V
FB
= 1.5V 0.25 0.38 0.52 V
Reference Voltage Line Regulation 3V ≤ V
IN
≤ V
MAX
, V
C
= 0.8V ● 0.03 %/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
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Supply Voltage
LT1070/LT1071 (Note 2) .................................... 40V
LT1070HV/LT1071HV (Note 2) .......................... 60V
Switch Output Voltage
LT1070/LT1071 .................................................. 65V
LT1070HV/LT1071HV ........................................ 75V
Feedback Pin Voltage (Transient, 1ms) ................ ±15V
Operating Junction Temperature Range
Commercial (Operating) ....................... 0°C to 100°C
Commercial (Short Circuit)................... 0°C to 125°C
Industrial ......................................... –40°C to 125°C
Military (OBSOLETE) ................. –55°C to 150°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
LT1070CK
LT1070HVCK
LT1070HVMK
LT1070IK
LT1070MK
LT1071CK
LT1071HVCK
LT1071HVMK
LT1071MK
ORDER PART
NUMBER
LT1070CT
LT1070HVCT
LT1070HVIT
LT1070IT
LT1071CT
LT1071HVCT
LT1071HVIT
LT1071IT
T
JMAX
= 100°C, θ
JA
= 35°C/ W, Q
JC
= 2°C (LT1070C, I)
T
JMAX
= 150°C, θ
JA
= 35°C/ W, Q
JC
= 2°C (LT1070M)
T
JMAX
= 100°C, θ
JA
= 35°C/ W, Q
JC
= 4°C (LT1071C, I)
T
JMAX
= 150°C, θ
JA
= 35°C/ W, Q
JC
= 4°C (LT1071M)
2
4
1
3
V
SW
V
C
FB
CASE
IS GND
V
IN
K PACKAGE
4-LEAD TO-3 METAL CAN
BOTTOM VIEW
T
JMAX
= 100°C, θ
JA
= 75°C/ W, Q
JC
= 2°C (LT1070C, I)
T
JMAX
= 100°C, θ
JA
= 75°C/ W, Q
JC
= 4°C (LT1071C)
T PACKAGE
5-LEAD PLASTIC TO-220
V
IN
V
SW
GND
FB
V
C
FRONT VIEW
5
4
3
2
1
ELECTRICAL CHARACTERISTICS
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
OBSOLETE PACKAGE
Consider the T5 Package for Alternate Source
The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open unless otherwise specified.
10701fe
3
LT1070/LT1071
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
FB
Flyback Reference Voltage I
FB
= 50µA 15 16.3 17.6 V
● 14 18.0 V
Change in Flyback Reference Voltage 0.05 ≤ I
FB
≤ 1mA 4.5 6.8 8.5 V
Flyback Reference Voltage Line Regulation I
FB
= 50µA, 3V ≤ V
IN
≤ V
MAX
(Note 3) 0.01 0.03 %/V
Flyback Amplifier Transconductance (g
m
) ∆I
C
= ±10µA 150 300 650 µmho
Flyback Amplifier Source and Sink Current V
C
= 0.6V, I
FB
= 50µA (Source) ● 15 32 70 µA
V
C
= 0.6V, I
FB
= 50µA (Sink) ● 25 40 70 µA
B
V
Output Switch Breakdown Voltage 3V ≤ V
IN
≤ V
MAX
,
I
SW
= 1.5mA
(LT1070/LT1071)
● 65 90 V
(LT1070HV/LT1071HV)
● 75 90 V
V
SAT
Output Switch “On” Resistance (Note 4) LT1070 ● 0.15 0.24 Ω
LT1071
● 0.30 0.50 Ω
Control Voltage to Switch Current LT1070 8 A/V
Transconductance LT1071 4 A/V
I
LIM
Switch Current Limit (LT1070) Duty Cycle ≤ 50%, T
J
≥ 25°C ● 510A
Duty Cycle ≤ 50%, T
J
< 25°C ● 511A
Duty Cycle = 80% (Note 5)
● 410A
Switch Current Limit (LT1071) Duty Cycle ≤ 50%, T
J
≥ 25°C ● 2.5 5.0 A
Duty Cycle ≤ 50%, T
J
< 25°C ● 2.5 5.5 A
Duty Cycle = 80% (Note 5)
● 2.0 5.0 A
∆I
IN
Supply Current Increase During 25 35 mA/A
∆I
SW
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 Supply Current 3V ≤ V
IN
≤ V
MAX
, V
C
= 0.05V 100 250 µA
Shutdown Mode Threshold Voltage 3V ≤ V
IN
≤ V
MAX
100 150 250 mV
● 50 300 mV
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: Minimum switch “on” time for the LT1070/LT1071 in current limit is
≈1µs. This limits the maximum input voltage during short-circuit conditions,
in the buck and inverting modes only
, to ≈35V. Normal (unshorted) conditions
are not affected. Mask changes are being implemented which will reduce
minimum “on” time to ≤1µs, increasing maximum short-circuit input voltage
above 40V. If the present LT1070/LT1071 (contact factory for package date
code) 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 LT1070/LT1071 in current limit, ≈1µs
f = Operating frequency (40kHz)
V
F
= Forward voltage of external catch diode at I
LIMIT
I
LIMIT
= Current limit of LT1070 (≈8A), LT1071 (≈4A)
R
L
= Internal series resistance of inductor
Note 3: V
MAX
= 55V for LT1070HV and LT1071HV to avoid switch
breakdown.
Note 4: Measured with V
C
in hi clamp, V
FB
= 0.8V. I
SW
= 4A for LT1070
and 2A for LT1071.
Note 5: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by I
LIM
= 3.33 (2 – DC) for the
LT1070 and I
LIM
= 1.67 (2 – DC) for the LT1071.
The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open unless otherwise specified.
P1-P3P4-P6P7-P9P10-P12

LT1071HVIT#PBF

Mfr. #:
Buy LT1071HVIT#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 5A & 2.5A Hi Eff Sw Regs
Lifecycle:
New from this manufacturer.
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