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Ordering number : ENA1438B
LA5756
Overview
Monolithic Linear IC
Separately-excited Step-down
Switching Regulator (Variable Type)
The LA5756 is a separately-excited step-down switching regulator (variable type).
Features
* Output smoothing condenser can use a Low ESR condenser for the reliability improvement * High efficiency * Four external parts * Time-base generator (80kHz) incorporated * Current limiter incorporated * Thermal shutdown circuit incorporated * Soft start circuit incorporated
Specifications
Maximum Ratings at Ta = 25C
Parameter Input voltage Output current SW pin application reverse Allowable power dissipation Symbol VIN max IO max VSW Pd max1 Pd max2 Operating temperature Storage temperature Topr Tstg Infinite heat sink. No heat sink. Conditions Ratings 34 3.5 -1 7.5 1.75 -30 to +125 -40 to +150 Unit V A V W W C C
Recommended Operating Conditions at Ta = 25C
Parameter Input voltage range Symbol VIN Conditions Ratings 4.5 to 32 Unit V
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
62409 SY 20090611-S00001 / 41509 MS / 40809 MS 20090326-S00003 No.A1438-1/4
LA5756
Electrical Characteristics at Ta = 25C, VO = 3.3V
Parameter Reference voltage Efficiency Switching frequency Line regulation Load regulation Output voltage temperature coefficient Ripple attenuation factor Current limiter operating voltage Thermal shutdown operating temperature Thermal shutdown hysteresis width Symbol VOS f VOLINE VOLOAD VO/Ta RREJ IS TSD TSD VIN = 15V, IO = 1.0A VIN= 8 to 20V, IO=1.0A VIN = 15V, IO = 0.5 to 1.5A Designed target value* f = 100 to 120Hz VIN = 15V Designed target value* Designed target value* 4.2 165 15 60 Conditions min 1.235 Ratings typ 1.26 78 80 40 10 0.5 45 100 100 30 max 1.285 V % kHz mV mV mV/C dB A C C Unit
* Designed target value: No measurement made.
Package Dimensions
unit : mm (typ) 3376
10.0
Pd max -- Ta
3.6
2.7
10.4 MAX 10.0
4.5 1.3
Allowable power dissipation, Pd max -- W
8.0 7.5
100x100x1.5mm3
Infinite heat sink jc=5C
15.0
6.0 5.6
50x50x1.5mm3 Al heat sink mounting torque 39Ncm silicone grease applied
40 60 80 100 120 140 160 MSG07021
(8.8)
15.5
21.3
4.0 3.3 2.0 1.75
30x30x1.5mm3 No heat sink
0.9
12 (1.6)
5 0.8 1.7 0.4 3.15 7.05
0 -30 -20
0
20
Ambient temperature, Ta -- C
SANYO : 220-5HMDB
Pin Assignment
(1)VIN (2)SWOUT (3)GND (4)VOS (5)SS
No.A1438-2/4
LA5756
Block Diagram
VIN 1 Constnt Current Circuit Reg. OCP 2 SWOUT
OSC
RESET DRIVE
Comp.
TSD 4 VOS
Amp.
ON/OFF Comp. 0.4V
VREF
5 SS
3 GND
Application Circuit Example
L1
VIN
SWOUT
LA5756
C1 D1 C2
VOS SS
C3
GND
R2 R1
Notes: C3 is for the soft start function. Delete C3 and keep the SS pin open when the soft function is not necessary.
Description of Functional Settings
1. Calculation equation to set the output voltage This IC controls the switching output so that the VOS pin voltage becomes 1.26V (typ). The equation to set the output voltage is as follows:
VO = 1+ R2 x 1.26V(typ) R1
The VOS pin has the inrush current of 1A (typ). Therefore, the error becomes larger when R1 and R2 resistance values are large.
No.A1438-3/4
LA5756
2. Start delay function The SS pin has the internally-connected 10A (typ) constant-current supply. When the voltage of SS pin exceeds the threshold voltage, the regulator starts operation. As the threshold is 0.62V(typ), the start delay time can be calculated as follows: ex. For setting at 1F
Td = C x V 1 x 0.4 = = 40 msec i 10
Timing Chart
VIN
SWOUT
VOUT
Td
Tss
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This catalog provides information as of June, 2009. Specifications and information herein are subject to change without notice. PS No.A1438-4/4

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