Datasheet Linear Technology LT1961

Manufacturer	Linear Technology
Series	LT1961

1.5A, 1.25MHz Step-Up Switching Regulator

Datasheets

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PDF, 163 Kb, Revision: A, File uploaded: Jul 31, 2016, Pages: 16
1.5A, 1.25MHz Step-Up Switching Regulator

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Packaging

	LT1961EMS8E#PBF	LT1961EMS8E#TRPBF	LT1961IMS8E#PBF	LT1961IMS8E#TRPBF
N	1	2	3	4
Package	MS-8E Package Outline Drawing	MS-8E Package Outline Drawing	MS-8E Package Outline Drawing	MS-8E Package Outline Drawing
Package Code	MS8E	MS8E	MS8E	MS8E
Package Index	05-08-1662	05-08-1662	05-08-1662	05-08-1662
Pin Count	8	8	8	8

Parametrics

Parameters / Models	LT1961EMS8E#PBF	LT1961EMS8E#TRPBF	LT1961IMS8E#PBF	LT1961IMS8E#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC433A	DC433A	DC433A	DC433A
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no	no
Features	External Synchronization	External Synchronization	External Synchronization	External Synchronization
Frequency, kHz	1250	1250	1250	1250
Frequency Sync Range	1.5MHz - 2MHz	1.5MHz - 2MHz	1.5MHz - 2MHz	1.5MHz - 2MHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	6	6	6	6
Isupply, mA	0.9	0.9	0.9	0.9
Monolithic	yes	yes	yes	yes
Number of Outputs	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Polyphase	no	no	no	no
Switch Current, A	2	2	2	2
Synchronous	no	no	no	no
Topology	Boost, Sepic, Flyback	Boost, Sepic, Flyback	Boost, Sepic, Flyback	Boost, Sepic, Flyback
Vin Max, V	25	25	25	25
Vin Min, V	3	3	3	3
Vin Min Startup, V	3	3	3	3
Vout Max, V	35	35	35	35
Vout Min, V	1.2	1.2	1.2	1.2
Vswitch Max, V	35	35	35	35

Eco Plan

	LT1961EMS8E#PBF	LT1961EMS8E#TRPBF	LT1961IMS8E#PBF	LT1961IMS8E#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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Boost Regulator Makes Low Profile SEPIC with Both Step-Up and Step-Down Capability &mdash DN317
PDF, 75 Kb, File published: Aug 1, 2003
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advertisement Boost Regulator Makes Low Profile SEPIC with Both Step-Up
and Step-Down Capability вЂ“ Design Note 317
Keith Szolusha 3V to 20V Input, 5V Output, 3mm Maximum
Height SEPIC
Figure 1 shows a 3V to 20V input, 5V output 3mm maximum height SEPIC using the LTВ®1961, a 1.25MHz, current mode, monolithic, 1.5A peak switch current, boost
converter. The output current capability of this circuit
varies with input voltage (see Figure 3). At 3V input, the
converter can supply up to 410mA of load current and
as high as 830mA of load current at 20V input. The tiny
coupling capacitor used here is large enough to handle
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
08/03/317_conv VIN
3V TO 20V IL1 CIN
2.2ОјF
25V
CERAMIC
X5R CCOUP
1ОјF 25V
CERAMIC X5R CATCH DIODE
UPS140
VOUT …

Articles

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Tiny 1.25MHz Monolithic Boost Regulator Has 1.5A Switch and Wide Input Voltage Range &mdash LT Journal
PDF, 159 Kb, File published: Dec 1, 2002
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DESIGN FEATURES Tiny 1.25MHz Monolithic Boost
Regulator Has 1.5A Switch and
Wide Input Voltage Range by Keith Szolusha
Introduction
The LT1961 is a monolithic, currentmode, boost converter with a very
high switching frequency and an onboard monolithic, high-current power
switch. Because the power switch is
included in the tiny MSOP 8-pin exposed leadframe package, layout and
board space shrink dramatically for
most designs. The high 1.25MHz
switching frequency further reduces
the size requirement for the surrounding inductors and capacitors, by
allowing the use of chip inductors
and low profile capacitors and inductors. It operates within a 3V to 25V
input voltage range and can be synchronized up to 2MHz. The built in
0.2в„¦, 35V switch allows up to 1.5A
switch current at high efficiency. In
battery-powered applications the extremely low 6ВµA shutdown current
maintains high efficiency and long
battery life. The shutdown pin also
provides an undervoltage lockout
option to limit battery source current
when low on charge. …

Model Line

Series: LT1961 (4)

LT1961EMS8E#PBF LT1961EMS8E#TRPBF LT1961IMS8E#PBF LT1961IMS8E#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > SEPIC Regulators
Power Management > Switching Regulator > Step-Up (Boost) Regulators > Internal Power Switch Boost

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