UC2577-ADJ Status: ACTIVE

Simple Step-Up Voltage Regulator

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Datasheet

UC2577-ADJ: Simple Step-Up Voltage Regulators (Rev. A) (PDF 655 KB)
16 May 2003

	UC2577-ADJ
Iout(Max)(A)	3
Iq(Typ)(mA)	45
Vin(Min)(V)	3
Vin(Max)(V)	40
Vout(Min)(V)	5
Vout(Max)(V)	60
Switching Frequency(Max)(kHz)	52
Regulated Outputs(#)	1
Duty Cycle(Max)(%)	100
Operating Temp Range(Celsius)	-40 to 125,-40 to 85
Pin/Package	5DDPAK/TO-263, 5TO-220
Topology	Boost
	Samples
	Inventory

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Product Information

Features

Requires Few External Components
NPN Output Switches 3.0A, 65V(max)
Extended Input Voltage Range: 3.0V to 40V
Current Mode Operation for Improved Transient Response, Line Regulation, and Current Limiting
Soft Start Function Provides Controlled Startup
52kHz Internal Oscillator
Output Switch Protected by Current Limit, Undervoltage Lockout and Thermal Shutdown
Improved Replacement for LM2577-ADJ Series
TYPICAL APPLICATIONS
- Simple Boost and Flyback Converters
- SEPIC Topology Permits Input Voltage to be Higher or Lower than Output Voltage
- Transformer Coupled Forward Regulators
- Multiple Output Designs

Description

The UC2577-ADJ device provides all the active functions necessary to implement step-up (boost), flyback, and forward converter switching regulators. Requiring only a few components, these simple regulators efficiently provide up to 60V as a step-up regulator, and even higher voltages as a flyback or forward converter regulator.

The UC2577-ADJ features a wide input voltage range of 3.0V to 40V and an adjustable output voltage. An on-chip 3.0A NPN switch is included with undervoltage lockout, thermal protection circuitry, and current limiting, as well as soft start mode operation to reduce current during startup. Other features include a 52kHz fixed frequency on-chip oscillator with no external components and current mode control for better line and load regulation.

A standard series of inductors and capacitors are available from several manufacturers optimized for use with these regulators and are listed in this data sheet.

Pricing / Packaging / CAD Design Tools / Samples

				Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Replaced By	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
UC2577T-ADJ	ACTIVE	-40 to 125		8.95 \| 1ku	TO-220 (KC) \| 5	View	50 \| TUBE
UC2577T-ADJG3	ACTIVE	-40 to 125		8.95 \| 1ku	TO-220 (KC) \| 5	View	50 \| TUBE
UC2577TD-ADJ	OBSOLETE	-40 to 125	UC2577TDKTTT-ADJ		DDPAK/TO-263 (KTT) \| 5	View			Replaced by UC2577TDKTTT-ADJ
UC2577TDKTTT-ADJ	ACTIVE	-40 to 85		8.15 \| 1ku	DDPAK/TO-263 (KTT) \| 5	View	50 \| SMALL T&R
UC2577TDKTTT-ADJG3	ACTIVE	-40 to 85		8.15 \| 1ku	DDPAK/TO-263 (KTT) \| 5	View	50 \| SMALL T&R
UC2577TDTR-ADJ	ACTIVE	-40 to 125		8.15 \| 1ku	DDPAK/TO-263 (KTT) \| 5	View	500 \| LARGE T&R		Purchase Samples
UC2577TDTR-ADJG3	ACTIVE	-40 to 125		8.15 \| 1ku	DDPAK/TO-263 (KTT) \| 5	View	500 \| LARGE T&R		Purchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 9:46 AM GMT, 06 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUC2577T-ADJ
Americas	Newark	50
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	130
Worldwide	Mouser Electronics	47
TI Lead Time*: 20 WeeksUC2577T-ADJG3
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	37
TI Lead Time*: 4 WeeksUC2577TDKTTT-ADJ
Americas	Newark	140
Americas	Rochester Electronics	950
Asia	Farnell Asia	187
Worldwide	DigiKey	35
Worldwide	Mouser Electronics	3
TI Lead Time*: 4 WeeksUC2577TDKTTT-ADJG3
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2577TDTR-ADJ
Americas	Rochester Electronics	>1k
TI Lead Time*: 20 WeeksUC2577TDTR-ADJG3
None Reported View Distributors
View all Distributors

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
UC2577T-ADJ	Green (RoHS & no Sb/Br)	CU SN	N/A for Pkg Type	View	View
UC2577T-ADJG3	Green (RoHS & no Sb/Br)	CU SN	N/A for Pkg Type	View	View
UC2577TDKTTT-ADJ	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC2577TDKTTT-ADJG3	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC2577TDTR-ADJ	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC2577TDTR-ADJG3	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for UC2577-ADJ

Datasheet

UC2577-ADJ: Simple Step-Up Voltage Regulators (Rev. A) (PDF, 655 KB)
16 May 2003

Application Notes

DN-49 UC2577 Controls SEPIC Converter for Automotive Applications (HTM, 8 KB) 2384 views
05 Sep 1999 Read Abstract

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TPS55332-Q1	Automotive Catalog 0.5-A, 60-V Step Up DC/DC Converter	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-UP REGULATORS	TI customers also evaluated this product.
TPS61085	18.5V, 2A, 650kHz, 1.2MHz Step-Up DC-DC Converter with Forced PWM Mode	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-UP REGULATORS	TI customers also evaluated this product.
TPS61086	18.5V PFM/PWM Step-Up DC-DC Converter with 2.0 A Switch	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-UP REGULATORS	TI customers also evaluated this product.
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TPS40210	Wide Input Range Current Mode Boost Controller	NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH)	TI customers also evaluated this product.
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UC2577-ADJ Status: ACTIVE

Simple Step-Up Voltage Regulator

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