Document
UNISONIC TECHNOLOGIES CO., LTD
UC3383
PFM CONTROLLED, STEP-UP DC/DC CONVERTERS (VARIABLE DUTY RATIO)
DESCRIPTION
The UTC UC3383 Series are PFM step-up DC/DC switching converter. The UTC UC3383 can support both large and small currents. It automatically switches duty ratio (45%/75%) when it senses changes in load.
Both built-in and external transistor types include 5-pin and 3-pin packages, which are provided with either a CE (chip enable) function that reduces power consumption during shut-down mode, or a VDD pin function (separated power and voltage detect pins). FEATURES
* Output Voltage Range: 2.0V~7.0V in 0.1V Increments * Operating (Start-up) Voltage Range: 0.9V~10V * Highly Accurate: Set-up Voltage ±2.5% * Maximum Oscillator Frequency (Max Fosc1): 180kHz (±15%) * Variable Duty Ratio: 45%/75% (±5%) * Both Switching Transistor Built-in and External Types are Available * 5-Lead Package Offer Chip Enable or Independent VOUT Pin Option.
CMOS IC
4 5
3 12
SOT-25
1 SOT-89
RDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
Package
UC3383L-xx-AB3-R UC3383G-xx-AB3-R
SOT-89
UC3383L-xx-AF5-R UC3383G-xx-AF5-R
SOT-25
Note: Pin Assignment: NC: No Connection CE: Chip Enable
xx: Output Voltage, refer to Marking Information.
Pin Assignment
1234
VSS VOUT Lx
-
CE VOUT NC VSS
5 Lx
Packing
Tape Reel Tape Reel
UC3383G-xx-AB3-R
(1)Packing Type (2)Package Type (3)Output Voltage Code (4)Green Package
(1) R: Tape Reel (2) AB3: SOT-89, AF5: SOT-25 (3) xx: refer to Marking Information (4) G: Halogen Free and Lead Free, L: Lead Free
www.unisonic.com.tw Copyright © 2019 Unisonic Technologies Co., Ltd.
1 of 14
QW-R502-032.M
UC3383
MARKING INFORMATION
PACKAGE SOT-25
SOT-89
VOLTAGE CODE 20:2.0V 25:2.5V 26:2.6V 27:2.7V 28:2.8V 30:3.0V 31:3.1V 32:3.2V 33:3.3V 36:3.6V 37:3.7V 40:4.0V 45:4.5V 50:5.0V
PIN DESCRIPTION
PIN NO. SOT-25 SOT-89
122 341 53
PIN NAME
CE VOUT NC VSS
Lx
CMOS IC
MARKING
54
H3 1 23
Voltage Code L: Lead Free G: Halogen Free
Date Code
XX UC3383
123
Voltage Code
L: Lead Free G: Halogen Free
FUNCTION
Chip Enable Output voltage monitor, IC internal power supply No Connection Ground Switch
BLOCK DIAGRAM
UTC UC3383 VDD is internally connected to the VOUT pin. VDD
Lx
VLx limiter
VREF
2 step PFM Control
+
VSS
OSC 100/180kHz
-
Chip Enable
+ ~5mV -
VOUT
CE Note: The CE pin is only used with the 5-Lead Package.
UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw
2 of 14
QW-R502-032.M
UC3383
CMOS IC
ABSOLUTE MAXIMUM RATINGS (TA=25°С, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
VOUT Input Voltage
VOUT 12 V
Lx pin Voltage
VLx 12 V
CE Input Voltage
VCE 12 V
VDD Input Voltage
VDD 12 V
Lx pin Current
ILX 400 mA
Power Dissipation
SOT-89 SOT-25
PD
500 mW 250 mW
Operating Junction Temperature
TJ
+125
°C
Ambient Operating Temperature
TOPR
-30 ~ +80
°C
Storage Temperature
TSTG
-40 ~ +125
°C
Note Absolute maximum ratings are those values beyond which the device.