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LT1370HVCR#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1370
sn1370 1370fs
500kHz High Efficiency
6A Switching Regulator
The LT
®
1370 is a monolithic high frequency current mode
switching regulator. It can be operated in all standard
switching configurations including boost, buck, flyback,
forward, inverting and “Cuk.” A 6A high efficiency switch
is included on the die, along with all oscillator, control and
protection circuitry.
The LT1370 typically consumes only 4.5mA quiescent
current and has higher efficiency than previous parts.
High frequency switching allows for very small inductors
to be used.
New design techniques increase flexibility and maintain
ease of use. Switching is easily synchronized to an exter-
nal logic level source. A logic low on the Shutdown pin
reduces supply current to 12µA. Unique error amplifier
circuitry can regulate positive or negative output voltage
while maintaining simple frequency compensation tech-
niques. Nonlinear error amplifier transconductance
reduces output overshoot on start-up or overload recov-
ery. Oscillator frequency shifting protects external com-
ponents during overload conditions.
DESCRIPTION
U
■
Faster Switching with Increased Efficiency
■
Uses Small Inductors: 4.7µH
■
All Surface Mount Components
■
Low Minimum Supply Voltage: 2.7V
■
Quiescent Current: 4.5mA Typ
■
Current Limited Power Switch: 6A
■
Regulates Positive or Negative Outputs
■
Shutdown Supply Current: 12µA Typ
■
Easy External Synchronization
■
Switch Resistance: 0.065Ω Typ
TYPICAL APPLICATION
U
FEATURES
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Boost Regulators
■
Laptop Computer Supplies
■
Multiple Output Flyback Supplies
■
Inverting Supplies
APPLICATIONS
U
5V to 12V Boost Converter
LT1370
V
IN
V
C
5V
GND
FB
LT1370 • TA01
V
SW
S/S
L1*
C1**
22µF
25V
C4**
22µF
25V
× 2
C2
0.047µF
C3
0.0047µF
R3
2k
R2
6.19k
1%
R1
53.6k
1%
V
OUT
†
12V
D1
MBRD835L
ON
OFF
*
**
COILTRONICS
UP2-4R7 (4.7µH)
UP4-100 (10µH)
AVX TPSD226M025R0200
+ +
L1
4.7µH
10µH
I
OUT
1.8A
2A
†
MAX I
OUT
12V Output Efficiency
LOAD CURRENT (A)
0
80
EFFICIENCY (%)
84
82
86
88
90
1.0 1.2 1.4 1.6 1.80.2 0.4 0.6 0.8 2.0
LT1370 • TA02
92
V
IN
= 5V
L = 10µH
2
LT1370
sn1370 1370fs
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage ....................................................... 30V
Switch Voltage
LT1370 ............................................................... 35V
LT1370HV .......................................................... 42V
S/S, SHDN, SYNC Pin Voltage ................................ 30V
Feedback Pin Voltage (Transient, 10ms) .............. ±10V
Feedback Pin Current........................................... 10mA
Negative Feedback Pin Voltage
(Transient, 10ms) ............................................. ±10V
Operating Ambient Temperature Range ...... 0°C to 70°C
Operating Junction Temperature Range
Commercial .......................................... 0°C to 125°C
Industrial ......................................... –40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
E
LECTR
IC
AL C CHARA TERIST
ICS
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, V
SW
, S/S and NFB pins open, T
A
= 25°C unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Reference Voltage Measured at Feedback Pin 1.230 1.245 1.260 V
V
C
= 0.8V ● 1.225 1.245 1.265 V
I
FB
Feedback Input Current V
FB
= V
REF
250 550 nA
● 900 nA
Reference Voltage Line Regulation 2.7V ≤ V
IN
≤ 25V, V
C
= 0.8V ● 0.01 0.03 %/V
V
NFR
Negative Feedback Reference Voltage Measured at Negative Feedback Pin – 2.525 – 2.48 –2.435 V
Feedback Pin Open, V
C
= 0.8V ● –2.560 – 2.48 –2.400 V
I
NFB
Negative Feedback Input Current V
NFB
= V
NFR
● –45 –30 –15 µA
Negative Feedback Reference Voltage 2.7V ≤ V
IN
≤ 25V, V
C
= 0.8V ● 0.01 0.05 %/V
Line Regulation
g
m
Error Amplifier Transconductance ∆I
C
= ±25µA 1100 1500 1900 µmho
● 700 2300 µmho
Error Amplifier Source Current V
FB
= V
REF
– 150mV, V
C
= 1.5V ● 120 200 350 µA
Error Amplifier Sink Current V
FB
= V
REF
+ 150mV, V
C
= 1.5V ● 1400 2400 µA
WU
U
PACKAGE
/
O
RDER I FOR ATIO
T
JMAX
= 125°C, θ
JA
= 30°C/W, θ
JC
= 4°C/W
R PACKAGE
7-LEAD PLASTIC DD
FRONT VIEW
TAB
IS
GND
V
IN
NFB
V
SW
GND
S/S
FB
V
C
7
6
5
4
3
2
1
ORDER PART
NUMBER
WITH PACKAGE SOLDERED TO 0.5 INCH
2
COPPER
AREA OVER BACKSIDE GROUND PLANE OR INTERNAL
POWER PLANE. θ
JA
CAN VARY FROM 20°C/W TO
>40°C/W DEPENDING ON MOUNTING TECHNIQUE
ORDER PART
NUMBER
T7 PACKAGE
7-LEAD TO-220
V
IN
NFB
V
SW
GND
S/S
FB
V
C
FRONT VIEW
7
6
5
4
3
2
1
TAB
IS
GND
T
JMAX
= 125°C, θ
JA
= 50°C/W, θ
JC
= 4°C/W
Consult factory for Military grade parts.
LT1370CR
LT1370HVCR
LT1370IR
LT1370HVIR
LT1370CT7
LT1370HVCT7
LT1370IT7
LT1370HVIT7
3
LT1370
sn1370 1370fs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier Clamp Voltage High Clamp, V
FB
= 1V 1.5 1.8 2.30 V
Low Clamp, V
FB
= 1.5V 0.2 0.3 0.52 V
A
V
Error Amplifier Voltage Gain 500 V/ V
V
C
Pin Threshold Duty Cycle = 0% 0.9 1.1 1.35 V
f Switching Frequency 2.7V ≤ V
IN
≤ 25V 460 500 550 kHz
0°C ≤ T
J
≤ 125°C ● 440 500 580 kHz
–40°C ≤ T
J
≤ 0°C (I-Grade) 400 580 kHz
Maximum Switch Duty Cycle ● 85 95 %
Switch Current Limit Blanking Time 130 300 ns
BV Output Switch Breakdown Voltage LT1370 ● 35 44 V
LT1370HVC, 0°C ≤ T
J
≤ 125°C ● 42 47 V
LT1370HVI, – 40°C ≤ T
J
≤ 0°C (I-Grade) 40 V
V
SAT
Output Switch ON Resistance I
SW
= 6A ● 0.065 0.11 Ω
I
LIM
Switch Current Limit Duty Cycle = 50% ● 6810A
Duty Cycle = 80% (Note 1) 7 A
∆I
IN
Supply Current Increase During Switch ON Time 22 33 mA/A
∆I
SW
Control Voltage to Switch Current 10 A/V
Transconductance
Minimum Input Voltage ● 2.4 2.7 V
I
Q
Supply Current 2.7V ≤ V
IN
≤ 25V ● 4.5 6 mA
Shutdown Supply Current 2.7V ≤ V
IN
≤ 25V, V
S/S
≤ 0.6V ● 12 40 µA
Shutdown Threshold 2.7V ≤ V
IN
≤ 25V ● 0.6 1.3 2 V
Shutdown Delay ● 41225µs
S/S Input Current 0V ≤ S/S ≤ 5V ● –7 10 µA
Synchronization Frequency Range ● 600 800 kHz
E
LECTR
IC
AL C CHARA TERIST
ICS
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, V
SW
, S/S and NFB pins open, T
A
= 25°C unless otherwise noted.
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: For duty cycles (DC) between 45% and 85%, minimum switch
current limit is given by I
LIM
= 2.65(2.7 – DC).
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1370HVCR#PBF

Mfr. #:
Buy LT1370HVCR#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 500kHz Hi Eff 6A Sw Reg
Lifecycle:
New from this manufacturer.
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