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Ordering number : ENA0498
Monolithic Linear IC
LA5779MP
Overview
Separately-excited Step-down
Switching Regulator (Variable Type)
The LA5779MP 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
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum Input voltage Maximum Output current SW pin application reverse voltage Allowable power dissipation Operating temperature Storage temperature Symbol VIN max IO max VSW Pd max Topr Tstg Mounted on a substrate.* Conditions Ratings 30 3 -1 3.9 -30 to +125 -40 to +150 Unit V A V W C C
* Specified substrate : 76.1x114.3x1.6mm3 : Copper foil ratio 60 FR4
Recommended Operating Conditions at Ta = 25C
Parameter Input voltage range Symbol VIN Conditions Ratings 4.5 to 28 Unit V
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N1306 MS PC 20060411-S00008 No.A0498-1/4
LA5779MP
Electrical Characteristics at Ta = 25C, VO = 3.3V
Parameter Reference voltage Efficiency Switching frequency Switching frequency when short-circuit protection is active Line regulation Load regulation Output voltage temperature coefficient Ripple attenuation factor Output leak current Current limiter operating voltage Operating current Standby current ENA pin LOW voltage range ENA pin HIGH voltage range Thermal shutdown operating temperature Thermal shutdown Hysteresis width * Design target value: No measurement made. TSD Designed target value. * 15 C RREJ IOleak IS IVIN ISTBY VENAL VENAH TSD Designed target value. * 2.4 165 f = 100 to 120Hz VIN = 15V, SWOUT = -0.4V VIN = 15V VIN = 15V VIN = 15V, ENA = 5V 3.1 5.6 50 100 0.6 VIN 45 50 dB A A mA A V V C VOLINE VOLOAD VO/Ta VIN = 8 to 20V, IO = 1.0A VIN = 15V, IO = 0.5 to 1.5A Designed target value. * 40 10 0.5 100 30 mV mV mV/C Symbol VOS f fshort Conditions VIN = 15V, IO = 1.0A VIN = 15V, IO = 1.0A, Set VO = 5V VIN = 15V, IO = 1.0A VIN = 15V, VOS = 0V 128 15 Ratings min 1.20 typ 1.23 84 160 30 192 45 max 1.26 Unit V % kHz kHz
Package Dimensions
unit : mm (typ) 3275
4.5
Pd max - Ta
1.2
10.0
4.5
Allowable power dissipation, Pd max - W
1.3
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
SANYO : SMP5
1.5
0.2 2.7
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) ENA
No.A0498-2/4
LA5779MP
Block Diagram
VIN 1 Reg. OCP
2 SWOUT
OSC
Reset
Drive
Comp.
THD 4 VOS VREF
Amp.
5 ENA
3 GND
Application Circuit Example
L1 47H
VIN
SWOUT
LA5779MP
C1 470F /50V D1 SBD C2 390F
VOS ENA GND
R2 R1
No.A0498-3/4
LA5779MP
Description of Functional Settings
Calculation equation to set the output voltage This IC controls the switching output so that the VOS pin voltage becomes 1.23V (typ). The equation to set the output voltage is as follows:
R2 VO = 1+ x 1.23V(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.
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This catalog provides information as of November, 2006. Specifications and information herein are subject to change without notice. PS No.A0498-4/4

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