UNISONIC TECHNOLOGIES CO., LTD
UC3750
Preliminary
CMOS IC
600kHZ PWM/PFM STEP-DOWN
DC-DC CONTROLLER
DESCRIPTION
The UTC UC3750 is a high frequency, micropower, voltage
mode 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.
The UTC UC3750 can operate in the constant -frequency PWM
(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.
The UTC UC3750 is suitable for applications, such as PDA,
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.
FEATURES
* High efficiency: 92% (Typ.)
* Automatic PWM/PFM switchover under light load
* 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)
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
* Pulse Width Modulation (PWM)switching
frequency:600kHz
* Internal under-voltage lockout (UVLO) protection
* Low profile and minimum external components
ORDERING INFORMATION
Ordering Number
Lead Free
Package
SOT-25
Packing
Halogen Free
UC3750G-xx-AF5-R
UC3750L-xx-AF5-R
Tape Reel
Note: xx: Output Voltage, refer to Marking Information.
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