UC3552

DESCRIPTION

The UTC UC3552 is a step-up PWM DC-DC converter with a

internal switch which is 1.6A, 0.23Ω. UTC UC3552 offers users

flexibility in determining loop dynamics and adjusting operating

frequency cause it’s equipped with an external compensation

pin ,and it also allows the use of small, low equivalent resistance

(ESR) ceramic output capacitors. UTC UC3552 is capable of

converting a standard input of 3.3V to multiple outputs of 8V, − 8V ,

and 23V. Otherwise, filtering and loop performance are enhanced

and facilitated by a high switching frequency of either 640 kHz

or1.3MHz.

As a power-smart design in shutdown mode a soft-start with an

external capacitor that sets the input current ramp rate, reduces the

current consumption to 0.1μA. A mere 2.6V input yields an

impressive output voltage to 12V when operating.

FEATURES

* 1.6A, 0.23Ω, internal switch

* High efficiency: 90%

* Adjustable output: V DD  to 12V

* Adjustable frequency: 640kHz or 1.3MHz

* Wide input range: +2.6V ~ +5.5V

* Low shutdown current: 0.1μA

* Programmable soft-start

规格书UC3552