UC3750G-XX-AF5-R UTC [Unisonic Technologies], UC3750G-XX-AF5-R Datasheet

UC3750G-XX-AF5-R

Manufacturer Part Number

UC3750G-XX-AF5-R

Description

600kHZ PWM/PFM STEP-DOWN DC-DC CONTROLLER

Manufacturer

UTC [Unisonic Technologies]

Datasheet

1.UC3750G-XX-AF5-R.pdf (9 pages)

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UC3750

600kHZ PWM/PFM STEP-DOWN

DC-DC CONTROLLER

step-down DC-DC controller IC and is designed for battery operated

hand-held electronic products. It can provide up to 2.0A loading

current with conversion efficiency by connection of appropriate

external P-type MOSFET. It also can be applied to operate for voltage

regulation with minimum external components and board space.

(Pulse Width Modulation) mode that provide low output ripple noise in

the normal operation and will automatically switch to PFM(Pulse

Frequency Modulation) mode at low output loads for higher efficiency.

Moreover, it is ideal for portable applications profited from Chip

Enable (CE) to reduce IC off-stage current and integrated feedback

resistor network.

camcorders and digital still camera, hand-held instrument, distributed

power system, computer peripheral, conversion from four NiMH or

NiCd or one Lithium-ion cells to 3.3V/1.8V.

* High efficiency: 92% (Typ.)

* Low quiescent bias current :50μA

* Low shutdown current:0.3μA (Typ.)

* Output voltage:1.8V~3.3V ±2.0%

* Low output voltage ripple:50mV (Typ.)

* Built-in soft-start (SS)

* Pulse Width Modulation (PWM)switching frequency:600kHz

* Automatic PWM/PFM switchover under light load condition

* Very low dropout operation, 100% max. duty cycle

* Chip enable(CE) pin with on-chip 150nA pull-up current source

* Input voltage：2.45V- 5.5V

* Internal under-voltage lockout (UVLO) protection

* Low profile and minimum external components

* Halogen free

www.unisonic.com.tw

Note: xx: Output Voltage, refer to Marking Information.

The UTC UC3750 is a high frequency, micropower, voltage mode

The UTC UC3750 can operate in the constant -frequency PWM

The UTC UC3750 is suitable for applications, such as PDA,

DESCRIPTION

FEATURES

ORDERING INFORMATION

UC3750G-xx-AF5-R

Ordering Number

UNISONIC TECHNOLOGIES CO., LTD

Preliminary

Package

SOT-25

Tape Reel

Packing

QW-R502-360.a

CMOS IC

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UC3750G-XX-AF5-R Summary of contents

Page 1

... Chip enable(CE) pin with on-chip 150nA pull-up current source * Input voltage：2.45V- 5.5V * Internal under-voltage lockout (UVLO) protection * Low profile and minimum external components * Halogen free ORDERING INFORMATION Ordering Number UC3750G-xx-AF5-R Note: xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2009 Unisonic Technologies Co., Ltd Preliminary Package SOT-25 ...

Page 2

UC3750 MARKING INFORMATION PACKAGE VOLTAGE CODE 27: 2.7V SOT-25 33: 3.3V PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME Chip Enable pin, active high (internal pull-up current source). By connecting this pin GND, the switching operation of ...

Page 3

UC3750 BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Preliminary CMOS QW-R502-360.a ...

Page 4

UC3750 ABSOLUTE MAXIMUM RATING PARAMETER Device Power Supply Input Voltage (CE) Output Voltage (V ) OUT Output Voltage (EXT) Junction Temperature Operating Temperature Storage Temperature Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. ...

Page 5

UC3750 ELECTRICAL CHARACTERISTICS UC3750-33(3.3V) PARAMETER TOTAL DEVICE Input Voltage Output Voltage Input Current into V Pin OUT Operating Current Off-State Current OSCILLATOR Frequency Maximum Duty Cycle Switchover ON Time Threshold (Note) Soft-Start Delay Time (Note) Protection Delay Time OUTPUT DRIVE ...

Page 6

UC3750 DESCRIPTION INFORMATION 1. Detailed Operating Description The UTC UC3750 is a step-down DC−DC controllers designed specially in portable applications powered by battery cells. The UTC UC3750 combines the advantages of Pulse frequency modulation (PFM) and Constant-frequency pulse width modulation ...

Page 7

UC3750 DESCRIPTION INFORMATION(Cont.) 8. Inductor Value Calculation Selecting the proper inductance must take an inductor’s physical size, transient respond and power conversion requirements into consideration. The fact is that lower inductor value can make the cost, PC board space smaller ...

Page 8

UC3750 DESCRIPTION INFORMATION(Cont.) 12. PCB Layout Recommendations Good PCB layout is important in switching mode power conversion. Careful PCB layout can minimize ground bounce, EMI noise and unwanted feedbacks that can affect the converter performance. 13. Grounding The output power ...

Page 9

UC3750 TYPICAL APPLICATION CIRCUIT GND UTC 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 ...

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