Sanyo LA7995M Specifications

Ordering number : EN5920A

Monolithic Linear IC

LA7995M

Charge Pump Type DC-DC Converter

Overview

This DC-DC converter IC supplies 30V from a VCC of 5V. Possible applications include use as a power supply for tuner circuitry on a PC video board. Conventional DC-DC converters utilize the counterelectromotive force in a coil to step up the voltage. This method suffers from high-frequency noise caused by sharp pulses. The so-called charge pump principle adopted in the LA7995M chip results in much lower noise and also has the advantage of using only capacitors, reducing the cost for peripheral components.

Package Dimensions

unit:mm

3111-MFP14S

[LA7955M]

14	8	0.625
	4.4	5.15	6.4

1	7	1.8max	0.15
8.0
		1.5
0.35	1.0 1.0	0.1

SANYO:MFP14S

Specifications

Maximum Ratings at Ta = 25°C

Parameter	Symbol	Conditions	Ratings	Unit
Maximum supply voltage	VCCmax		7	V
Allowable power dissipation	Pd max	Ta 65°C*	380	mW
Operating temperature	Topr		–10 to +65	°C
Storage temperature	Tstg		–55 to +150	°C

Note: *Includes substrate (phenol) 144.3 x 76.1 x 1.6 mm

Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability such as life-support systems aircraft’s control systems or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that exceed even momentarily rated values (such as maximum ratings operating condition ranges or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

SANYO Electric Co., Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

71598RM(KI) No. 5920-1/5

LA7995M

Operating Conditions at Ta = 25°C

	Parameter	Symbol	Conditions		Ratings		Unit
	Recommended supply voltage	VCC				5	V
	Operating supply voltage range	VCCop			4.75 to 5.25		V
Operating Characteristics at Ta = 25°C
	Parameter	Symbol	Conditions		Ratings		Unit
				min	typ	max
	Current drain	IIN	IO=1 mA, VCC=5V	19	24	29	mA
	Output voltage	VOUT	IO=1 mA, VCC=5V	29	30.7	32	V
	Output voltage fluctuation	VOUT	IO=1 mA, VIN=4.75 to 5.25V		1.0	1.5	V
	Output current	IOUT	VO=29V	1.5	1.7		mA
	Oscillation frequency	f	COSC=150pF	35	50	65	KHz

Note: The above specifications are measured with external capacitance provided by three 0.33 F chip capacitors(C1, C2, C3).

Charge Pump Principle

Figure 1 shows a charge pump circuit. Driving S1 and S2 with opposite phase produces a doubled voltage

VOUT 2VCC

S1

VCC

S2

A11009

Figrue 1 Chrage pump circuit

In order to supply 30V from 5V, the LA7995M uses three charge pump circuits in series to produce a step-up factor of 2 x 2 x 2 = 8.

71598RM(KI) No. 5920-2/5