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Ordering number : ENA0589B
Monolithic Linear IC
LA5734MP
Overview
Separately-Excited Step-Down
Switching Regulator (Variable Type)
The LA5734MP is a separately-excited step-down switching regulator (variable type).
Functions
* High efficiency. * Six external parts. * Time-base generator (160kHz) incorporated. * Current limiter incorporated. * Thermal shutdown circuit incorporated. * ON/OFF function.
Specifications
Maximum Ratings at Ta = 25C
Parameter Input voltage Maximum output current SW pin application reverse voltage Allowable power dissipation Operating temperature Storage temperature * Specified circuit board : 76.1x114.3x1.6mm3, Symbol VIN IO max VSW Pd max Topr Tstg Copper foil ratio 60% FR4 Mounted on a circuit board.* Conditions Ratings 34 3 -1 3.9 -30 to +125 -40 to +150 Unit V A V W C C
Recommended Operating Conditions at Ta = 25C
Parameter Input voltage range Symbol VIN Conditions Ratings 4.5 to 32 Unit V
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71907 MS / 31407 MS PC / 11707 MS PC 20061204-S00002 No.A0589-1/4
LA5734MP
Electrical Characteristics at Ta = 25C, VO = 1V
Parameter Reference voltage 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 * Design target value : No measurement made. TSD Designed target value. * 15 C RREJ IS TSD f = 100 to 120Hz VIN = 15V Designed target value. * 3.1 165 45 dB A C Symbol VOS f VOLINE VOLOAD VO/Ta Conditions min VIN = 5V, IO = 1.0A VIN = 5V, IO = 1.0A VIN = 5 to 8V, IO = 1.0A VIN = 5V, IO = 0.5 to 1.5A Designed target value. * 0.775 128 Ratings typ 0.79 160 10 10 0.5 max 0.805 192 30 30 V kHz mV mV mV/C Unit
Package Dimensions
unit : mm (typ) 3275
4.5
Pd max - Ta
1.2
10.0
4.5 1.3
Allowable power dissipation, Pd max - W
4.0 3.90 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -30 -20
Specified sbstrate: 76.1x114.3x1.6mm3 Copper foil ratio 60% FR4
(8.8)
9.9
(1.6)
1.7
0.9 0.4
4.5
1.5
0.2 2.7
1
5
SANYO : SMP5
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta - C
MSG06072
Pin Assignment
(1) VIN (2) SWOUT (3) GND (4) VOS (5) SS
No.A0589-2/4
LA5734MP
Block Diagram
VIN 1 Reg. OCP
2 SWOUT
OSC
Reset
Drive
Comp.
TSD 4 VOS VREF
Amp.
5 SS
3 GND
Application Circuit Example
L1 47H
VIN
SWOUT
LA5734MP
C1 470F D1 SBD C2 680F
VOS SS
C3 1F
GND
R2 R1
No.A0589-3/4
LA5734MP
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 0.8V (typ). The equation to set the output voltage is as follows :
R2 VO = 1+ x 0.8V(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.
Timing Chart
VIN
SWOUT
VOUT
Td
Tss
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This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice. PS No.A0589-4/4

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