UC2845D8TR

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Texas Instruments

SINGLE ENDED 500KHZ CURRENT MODE PWM CONTROLLER WITH 8.4V/7.6V UVLO 50% DUTY CYCLE, -40C TO 85C 8-SOIC -40 TO 85

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DocumentsUnderstanding Boost Power Stages In Switchmode Power Supplies DN-65 Considerations in Powering BiCMOS ICs +13

UC2845D8TR

Active

Texas Instruments

SINGLE ENDED 500KHZ CURRENT MODE PWM CONTROLLER WITH 8.4V/7.6V UVLO 50% DUTY CYCLE, -40C TO 85C 8-SOIC -40 TO 85

Deep-Dive with AI

DocumentsUnderstanding Boost Power Stages In Switchmode Power Supplies DN-65 Considerations in Powering BiCMOS ICs +13

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics commom to parts in this series

Specification	UC2845D8TR	UC2845 Series

Applications	PWM Controller	PWM Controller
Clock Sync	-	False
Control Features	-	Frequency Control
Current - Supply	11 mA	11 mA
Duty Cycle (Max)	-	48 %
Function	-	Step-Down, Step-Up/Step-Down, Step-Up
Mounting Type	Surface Mount	Surface Mount, Through Hole
Number of Outputs	-	1
Operating Temperature [Max]	85 °C	85 - 125 °C
Operating Temperature [Min]	-40 °C	-40 °C
Output Configuration	-	Positive, Isolation Capable
Output Phases	-	1
Output Type	-	Transistor Driver
Package / Case	3.9 mm	0.3 - 3.9 mm
Package / Case	8-SOIC	8-SOIC, 16-SOIC, 14-SOIC, 8-DIP
Package / Case	-	3.9 mm
Package / Case	-	0.154 - 7.62 in
Supplier Device Package	8-SOIC	8-SOIC, 16-SOIC, 8-PDIP
Synchronous Rectifier	-	False
Topology	-	Buck, Forward, Boost, Flyback
Voltage - Input [Max]	6.3 V	6.3 V
Voltage - Input [Min]	-3 V	-3 V
Voltage - Supply (Vcc/Vdd)	-	12 V
Voltage - Supply (Vcc/Vdd)	-	28 V
Voltage - Supply [Max]	28 V	28 - 30 V
Voltage - Supply [Min]	12 V	7.6 - 12 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Chip One Stop	N/A	1	$ 0.45
		10	$ 0.44
		50	$ 0.44
		200	$ 0.44
		500	$ 0.43
		1000	$ 0.43
		2000	$ 0.43
DigiKey	N/A	1	$ 0.72
		10	$ 0.51
		25	$ 0.46
		100	$ 0.40
		250	$ 0.37
		500	$ 0.36
		1000	$ 0.34
		2500	$ 0.33
		5000	$ 0.32
		7500	$ 0.32
		12500	$ 0.31
		17500	$ 0.31
		25000	$ 0.31
Digikey	Cut Tape (CT)	1	$ 1.12
		10	$ 1.00
		25	$ 0.95
		100	$ 0.78
		250	$ 0.73
		500	$ 0.65
		1000	$ 0.51
	Digi-Reel®	1	$ 1.12
		10	$ 1.00
		25	$ 0.95
		100	$ 0.78
		250	$ 0.73
		500	$ 0.65
		1000	$ 0.51
	Tape & Reel (TR)	2500	$ 0.48
		5000	$ 0.45
		12500	$ 0.43
LCSC	N/A	1	$ 0.50
		10	$ 0.40
		30	$ 0.35
		100	$ 0.31
		500	$ 0.28
		1000	$ 0.26
Mouser Electronics	N/A	1	$ 0.72
		10	$ 0.46
		100	$ 0.42
		500	$ 0.41
		2500	$ 0.33
		5000	$ 0.32
		10000	$ 0.31
		25000	$ 0.31
Rochester Electronics	N/A	1	$ 0.32
		25	$ 0.31
		100	$ 0.30
		500	$ 0.29
		1000	$ 0.27
Texas Instruments	LARGE T&R	1	$ 0.57
		100	$ 0.44
		250	$ 0.32
		1000	$ 0.23
Win Source Electronics	N/A	105	$ 0.49
		250	$ 0.40
		390	$ 0.39
		535	$ 0.38
		690	$ 0.36
		920	$ 0.33

UC2845 Series

IC REG CTRLR MULT TOPOLOGY 8SOIC

Part	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case	Current - Supply	Supplier Device Package	Voltage - Input [Min]	Voltage - Input [Max]	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Applications	Package / Case	Package / Case	Function	Control Features	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Number of Outputs	Topology	Duty Cycle (Max) [Max]	Output Phases	Output Type
Texas Instruments UC2845D8G4	85 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	12 V	28 V	Surface Mount	PWM Controller
Texas Instruments UC2845ADW	85 °C	-40 °C		16-SOIC	11 mA	16-SOIC	-3 V	6.3 V	7.6 V	30 VDC	Surface Mount	PWM Controller
Texas Instruments UC2845D	85 °C	-40 °C		14-SOIC	11 mA		-3 V	6.3 V	12 V	28 V	Surface Mount	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2845ADTR	85 °C	-40 °C		14-SOIC	11 mA		-3 V	6.3 V	7.6 V	30 VDC	Surface Mount	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2845AQD8R	125 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	7.9 V	30 VDC	Surface Mount	PWM Controller
Texas Instruments UC2845AQD	125 °C	-40 °C		14-SOIC	11 mA		-3 V	6.3 V	7.9 V	30 VDC	Surface Mount	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2845AD8TRG4	85 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	7.6 V	30 VDC	Surface Mount	PWM Controller
Texas Instruments UC2845DTRG4	85 °C	-40 °C		14-SOIC	11 mA		-3 V	6.3 V	12 V	28 V	Surface Mount	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2845D8TR	85 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	12 V	28 V	Surface Mount	PWM Controller
Texas Instruments UC2845AQDR	125 °C	-40 °C		14-SOIC	11 mA		-3 V	6.3 V	7.9 V	30 VDC	Surface Mount	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2845P	85 °C	-40 °C	0.3 in	8-DIP		8-PDIP					Through Hole			7.62 mm	Step-Down, Step-Up, Step-Up/Step-Down	Frequency Control	12 V	28 V	Isolation Capable, Positive	1	Boost, Buck, Flyback, Forward	48 %	1	Transistor Driver
Texas Instruments UC2845AD8	85 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	7.6 V	30 VDC	Surface Mount	PWM Controller
Texas Instruments UC2845AD8G4	85 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	7.6 V	30 VDC	Surface Mount	PWM Controller
Texas Instruments UC2845AD	85 °C	-40 °C		14-SOIC	11 mA		-3 V	6.3 V	7.6 V	30 VDC	Surface Mount	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2845D8TRG4	85 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	12 V	28 V	Surface Mount	PWM Controller
Texas Instruments UC2845ANG4	85 °C	-40 °C	0.3 in	8-DIP	11 mA	8-PDIP	-3 V	6.3 V	7.6 V	30 VDC	Through Hole	PWM Controller		7.62 mm
Texas Instruments UC2845N	85 °C	-40 °C	0.3 in	8-DIP	11 mA	8-PDIP	-3 V	6.3 V	12 V	28 V	Through Hole	PWM Controller		7.62 mm
Texas Instruments UC2845D8	85 °C	-40 °C	3.9 mm	8-SOIC	11 mA	8-SOIC	-3 V	6.3 V	12 V	28 V	Surface Mount	PWM Controller
Texas Instruments UC2845NG4	85 °C	-40 °C	0.3 in	8-DIP	11 mA	8-PDIP	-3 V	6.3 V	12 V	28 V	Through Hole	PWM Controller		7.62 mm

Description

General part information

UC2845 Series

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.