Datasheet Linear Technology LT1521

Manufacturer	Linear Technology
Series	LT1521

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

Datasheets

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PDF, 210 Kb, Language: en, File uploaded: Sep 2, 2017, Pages: 16
300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

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Prices

Packaging

	LT1521CMS8#PBF	LT1521CMS8-3#PBF	LT1521CMS8-3#TRPBF	LT1521CMS8-3.3#PBF	LT1521CMS8-3.3#TRPBF	LT1521CMS8-5#PBF	LT1521CS8#PBF	LT1521CS8#TRPBF	LT1521CS8-3#PBF	LT1521CS8-3#TRPBF	LT1521CS8-3.3#PBF	LT1521CS8-3.3#TRPBF	LT1521CS8-5#PBF	LT1521CS8-5#TRPBF	LT1521CST-3#PBF	LT1521CST-3#TRPBF	LT1521CST-3.3#PBF	LT1521CST-3.3#TRPBF	LT1521CST-5#PBF	LT1521CST-5#TRPBF	LT1521IS8#PBF	LT1521IS8#TRPBF	LT1521IS8-3#PBF	LT1521IS8-3#TRPBF	LT1521IS8-3.3#PBF	LT1521IS8-3.3#TRPBF	LT1521IS8-5#PBF	LT1521IS8-5#TRPBF	LT1521IST-3#PBF	LT1521IST-3#TRPBF	LT1521IST-3.3#PBF	LT1521IST-3.3#TRPBF	LT1521IST-5#PBF	LT1521IST-5#TRPBF
N	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34
Package	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SO-8 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing	SOT-223 Package Outline Drawing
Package Code	MS8	MS8	MS8	MS8	MS8	MS8	S8	S8	S8	S8	S8	S8	S8	S8	ST	ST	ST	ST	ST	ST	S8	S8	S8	S8	S8	S8	S8	S8	ST	ST	ST	ST	ST	ST
Package Index	05-08-1660	05-08-1660	05-08-1660	05-08-1660	05-08-1660	05-08-1660	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1630	05-08-1630	05-08-1630	05-08-1630	05-08-1630	05-08-1630	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1630	05-08-1630	05-08-1630	05-08-1630	05-08-1630	05-08-1630
Pin Count	8	8	8	8	8	8	8	8	8	8	8	8	8	8	3	3	3	3	3	3	8	8	8	8	8	8	8	8	3	3	3	3	3	3

Parametrics

Parameters / Models	LT1521CMS8#PBF	LT1521CMS8-3#PBF	LT1521CMS8-3#TRPBF	LT1521CMS8-3.3#PBF	LT1521CMS8-3.3#TRPBF	LT1521CMS8-5#PBF	LT1521CS8#PBF	LT1521CS8#TRPBF	LT1521CS8-3#PBF	LT1521CS8-3#TRPBF	LT1521CS8-3.3#PBF	LT1521CS8-3.3#TRPBF	LT1521CS8-5#PBF	LT1521CS8-5#TRPBF	LT1521CST-3#PBF	LT1521CST-3#TRPBF	LT1521CST-3.3#PBF	LT1521CST-3.3#TRPBF	LT1521CST-5#PBF	LT1521CST-5#TRPBF	LT1521IS8#PBF	LT1521IS8#TRPBF	LT1521IS8-3#PBF	LT1521IS8-3#TRPBF	LT1521IS8-3.3#PBF	LT1521IS8-3.3#TRPBF	LT1521IS8-5#PBF	LT1521IS8-5#TRPBF	LT1521IST-3#PBF	LT1521IST-3#TRPBF	LT1521IST-3.3#PBF	LT1521IST-3.3#TRPBF	LT1521IST-5#PBF	LT1521IST-5#TRPBF
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File
Discrete Pass Element	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no
Dropout Voltage, V	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Export Control	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no
Features	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown
Ishutdown, µA	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Isupply, mA	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012	0.012
Max Junction Temp, Deg	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125
Number of Outputs	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
Operating Temperature Range, °C	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Output Current, A	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3
Output Voltage	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5	Adj, 3, 3.3, 5
Theta JA	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)	125В°C/W (MS8), 70В°C/W (S8), 50В°C/W (ST)
Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Vin Max, V	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20
Vin Min, V	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3
Vout Max, V	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20
Vout Min, V	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8

Eco Plan

	LT1521CMS8#PBF	LT1521CMS8-3#PBF	LT1521CMS8-3#TRPBF	LT1521CMS8-3.3#PBF	LT1521CMS8-3.3#TRPBF	LT1521CMS8-5#PBF	LT1521CS8#PBF	LT1521CS8#TRPBF	LT1521CS8-3#PBF	LT1521CS8-3#TRPBF	LT1521CS8-3.3#PBF	LT1521CS8-3.3#TRPBF	LT1521CS8-5#PBF	LT1521CS8-5#TRPBF	LT1521CST-3#PBF	LT1521CST-3#TRPBF	LT1521CST-3.3#PBF	LT1521CST-3.3#TRPBF	LT1521CST-5#PBF	LT1521CST-5#TRPBF	LT1521IS8#PBF	LT1521IS8#TRPBF	LT1521IS8-3#PBF	LT1521IS8-3#TRPBF	LT1521IS8-3.3#PBF	LT1521IS8-3.3#TRPBF	LT1521IS8-5#PBF	LT1521IS8-5#TRPBF	LT1521IST-3#PBF	LT1521IST-3#TRPBF	LT1521IST-3.3#PBF	LT1521IST-3.3#TRPBF	LT1521IST-5#PBF	LT1521IST-5#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Application Notes

Download
A Monolithic Switching Regulator with 100ВµV Output Noise &mdash AN70
PDF, 1.7 Mb, Language: en, File published: Oct 1, 1997
This publication details circuitry and applications considerations for the LT1533 low noise switching regulator. Eleven DC/DC converter circuits are presented, some offering <100µV output noise in a 100MHz bandwidth. Tutorial sections detail low noise DC/DC design, measurement, probing and layout techniques, and magnetics selection.
Extract from the document
Application Note 70
October 1997
A Monolithic Switching Regulator with 100ВµV Output Noise
вЂњSilence is the perfectest herald of joy .вЂќ
Jim Williams INTRODUCTION
Size, output flexibility and efficiency advantages have
made switching regulators common in electronic apparatus. The continued emphasis on these attributes has
resulted in circuitry with 95% efficiency that requires
minimal board area. Although these advantages are welcome, they necessitate compromising other parameters. back to the driving source (вЂњreflectedвЂќ noise) and it is
radiated. The multiple transmission paths combine with
the high frequency content to make noise suppression
difficult. Unconscionable amounts of bypass capacitors,
ferrite beads, shields, Mu-metal and aspirin have been
expended in attempts to ameliorate noise-induced effects. Switching Regulator вЂњNoiseвЂќ
Something commonly referred to as вЂњnoiseвЂќ is a primary
concern. The switched mode power delivery that permits
the aforementioned advantages also creates wideband
harmonic energy. This undesirable energy appears as
radiated and conducted components commonly labeled
as вЂњnoise.вЂќ Actually, switching regulator output вЂњnoiseвЂќ is
not really noise at all, but coherent, high frequency residue
directly related to the regulatorвЂ^TMs switching.1 Figure 1
shows typical switching regulator output noise. Two distinct characteristics are present. The slow, ramping output …

Design Notes

Download
New Micropower, Low Dropout Regulators Ease Battery Supply Designs &mdash DN121
PDF, 85 Kb, File published: Jan 5, 1996
Extract from the document
New Micropower, Low Dropout Regulators Ease Battery
Supply Designs вЂ“ Design Note 121
Mitchell Lee and John Seago
Three new linear regulators simplify the design of
battery-operated equipment. The LTВ®1521 is a 300mA,
positive low dropout regulator with micropower quiescent current and shutdown. The LT1175 is a 500mA
negative complement with adjustable current limit. A
third product, the LT1118, has the unique capability of
maintaining output regulation while sourcing or sinking
load current.
The LT1521 contains all of the features associated
with battery-operated applications. In designs where
memory must be powered continuously, the LT1521вЂ™s
12ОјA quiescent current eliminates the need for a
separate micropower backup supply. In shutdown the
quiescent current drops to 6ОјA. Figure 1 shows an
example application using the LTC В®1477 as a means
of disconnecting all circuitry except for memory and
ON/OFF control logic. The LTC1477 protected high
side switch draws only 10nA in shutdown, eliminating
itself as well as its load as a factor in battery shelf life.
In battery-backed memory applications, the output of
the LT1521 can be held up by the backup battery while …

Model Line

Series: LT1521 (34)

LT1521CMS8#PBF LT1521CMS8-3#PBF LT1521CMS8-3#TRPBF LT1521CMS8-3.3#PBF LT1521CMS8-3.3#TRPBF LT1521CMS8-5#PBF LT1521CS8#PBF LT1521CS8#TRPBF LT1521CS8-3#PBF LT1521CS8-3#TRPBF LT1521CS8-3.3#PBF LT1521CS8-3.3#TRPBF LT1521CS8-5#PBF LT1521CS8-5#TRPBF LT1521CST-3#PBF LT1521CST-3#TRPBF LT1521CST-3.3#PBF LT1521CST-3.3#TRPBF LT1521CST-5#PBF LT1521CST-5#TRPBF LT1521IS8#PBF LT1521IS8#TRPBF LT1521IS8-3#PBF LT1521IS8-3#TRPBF LT1521IS8-3.3#PBF LT1521IS8-3.3#TRPBF LT1521IS8-5#PBF LT1521IS8-5#TRPBF LT1521IST-3#PBF LT1521IST-3#TRPBF LT1521IST-3.3#PBF LT1521IST-3.3#TRPBF LT1521IST-5#PBF LT1521IST-5#TRPBF

Manufacturer's Classification

Power Management > LDO Linear Regulators > Positive Linear Regulators (LDO)