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STMicroelectronics Electronic Components Datasheet

L4970 Datasheet

10A SWITCHING REGULATOR

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L4970 pdf
® L4970A
10A SWITCHING REGULATOR
10A OUTPUT CURRENT
5.1V TO 40V OUTPUT VOLTAGE RANGE
0 TO 90% DUTY CYCLE RANGE
INTERNAL FEED-FORWARD LINE REGULA-
TION
INTERNAL CURRENT LIMITING
PRECISE 5.1V ± 2% ON CHIP REFERENCE
RESET AND POWER FAIL FUNCTIONS
SOFT START
INPUT/OUTPUT SYNC PIN
UNDER VOLTAGE LOCK OUT WITH HYS-
TERETIC TURN-ON
PWM LATCH FOR SINGLE PULSE PER PE-
RIOD
VERY HIGH EFFICIENCY
SWITCHING FREQUENCY UP TO 500KHz
THERMAL SHUTDOWN
CONTINUOUS MODE OPERATION
DESCRIPTION
The L4970A is a stepdown monolithic power
switching regulator delivering 10A at a voltage
variable from 5.1 to 40V.
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
Multiwatt15V
ORDERING NUMBER: L4970A
Realized with BCD mixed technology, the device
uses a DMOS output transistor to obtain very high
efficiency and very fast switching times. Features
of the L4970A include reset and power fail for mi-
croprocessors, feed forward line regulation, soft
start, limiting current and thermal protection. The
device is mounted in a 15-lead multiwatt plastic
power package and requires few external compo-
nents. Efficient operation at switching frequencies
up to 500KHz allows reduction in the size and
cost of external filter components.
June 2000
1/21
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.


STMicroelectronics Electronic Components Datasheet

L4970 Datasheet

10A SWITCHING REGULATOR

No Preview Available !

L4970 pdf
L4970A
ABSOLUTE MAXIMUM RATINGS
Symbol
V9
V9
V7
I7
V6
V3, V12
V4
I4
V5, V10, V11, V13
I5
I10
I12
Ptot
Tj, Tstg
Parameter
Input Voltage
Input Operating Voltage
Output DC Voltage
Output Peak Voltage at t = 0.1µs f = 200KHz
Maximum Output Current
Bootstrap Voltage
Bootstrap Operating Voltage
Input Voltage at Pins 3, 12
Reset Output Voltage
Reset Output Sink Current
Input Voltage at Pin 5, 10, 11, 13
Reset Delay Sink Current
Error Amplifier Output Sink Current
Soft Start Sink Current
Total Power Dissipation at Tcase < 120°C
Junction and Storage Temperature
PIN CONNECTION (Top view)
Value
55
50
-1
-7
Internally Limited
65
V9 + 15
12
50
50
7
30
1
30
30
-40 to 150
Unit
V
V
V
V
V
V
V
V
mA
V
mA
A
mA
W
°C
THERMAL DATA
Symbol
Rth j-case
Rth j-amb
Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
2/21
max
max
Value
1
35
Unit
°C/W
°C/W


Part Number L4970
Description 10A SWITCHING REGULATOR
Maker STMicroelectronics
Total Page 21 Pages
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