Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UD05201
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CMOS IC
1.2MHZ, 2A SYNCHRONOUS
STEP-DOWN CONVERTER

DESCRIPTION
The UTC UD05201 is a 1.2MHz constant frequency current mode
PWM step-down converter. It is ideal for portable equipment
requiring very high current up to 2A from single-cell Lithium-ion
batteries while still achieving over 90% efficiency during peak load
conditions. The UTC UD05201 also can run at 100% duty cycle for
low dropout operation, extending battery life in portable systems
while light load operation provides very low output ripple for noise
sensitive applications. The UTC UD05201 can supply up to 2A
output load current from a 2.6V to 5.5V input voltage and the output
voltage can be regulated as low as 0.6V. The high switching
frequency minimizes the size of external components while keeping
switching losses low. The internal slope compensation setting allows
the device to operate with smaller inductor values to optimize size
and provide efficient operation. The UTC UD05201 is available in
adjustable (0.6V to VIN) output voltage.

SOP-8
FEATURES
* 2.6V~5.5V Input Voltage Range
* Output Voltages from 0.6V to VIN
* High Efficiency: Up to 96%
* 1.2MHz Constant Frequency Operation
* Up to 2A Output Current
* No Schottky Diode Required
* Low RDS(ON) Internal Switches: 0.15Ω
* Current Mode Operation for Excellent Line and Load Transient
Response
* Current limit, Enable function
* Short Circuit Protect (SCP)
* Build-in Soft Start function
* ≤ 1µA Shutdown Current

ORDERING INFORMATION
Ordering Number
UD05201G-S08-A-R
UD05201G-S08-B-R
UD05201G-S08-C-R
UD05201G-S08-A-R
Package
SOP-8
SOP-8
SOP-8
(1)Packing Type
(1) R: Tape Reel
(2)Pin Code
(2) Refer to PIN CONFIGURATION
(3)Package Type
(3) S08: SOP-8
(4)Green Package
(4) G: Halogen Free and Lead Free
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Packing
Tape Reel
Tape Reel
Tape Reel
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UD05201
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
MARKING

PIN CONFIGURATION
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PIN DESCRIPTION
A
PIN NO.
B
C
1
4
5
EN
2
3
4, 6
5
8
1
3, 5
2
8
1
3
4
PVIN
SVIN
SGND
FB
7
7
7
LX
8
-
6
-
6
2
PGND
NC
PIN NAME
DESCRIPTION
Enable pin H: normal operation
L: Shutdown
Power Supply Input Pin
Signal Supply Input Pin
Signal Ground Pin
Output Feedback pin
Switch output pin. Connect external inductor here. Minimize trace area at
this pin to reduce EMI.
Power Ground Pin
No connect pin
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
CMOS IC
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UD05201
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CMOS IC
BLOCK DIAGRAM
OSC
SVIN
SLOPE
COMP
+
Isense
REF
PVIN
-
AMP
0.6V
SET
Soft-Star
+
FB
-
ICOMP
+
RESET
PWM
LOGIC
NONOVERLAP
CONTROL
LX
+
Izero
-
COMP
SGND
Over-Temperature and
Short-Circuit Protection
Enable Logic
PGND
EN
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
PVIN, SVIN Pin Voltage
VIN
VSS -0.3 to VSS+ 6
V
Feedback Pin Voltage
VFB
VSS -0.3 to VIN+ 0.3
V
EN Pin Voltage
VEN
VSS -0.3 to VIN+ 0.3
V
Switch Pin Voltage
VLX
VSS -0.3 to VIN+ 0.3
V
Power Dissipation
PD
mW
Junction Temperature
TJ
+125
°C
Operating Temperature Range
TOPR
-40~+85
°C
Storage Temperature Range
TSTG
-40~+150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL RESISTANCES CHARACTERISTICS
PARAMETER
SYMBOL
RATING
Junction to Ambient
θJA
120
Junction to Case
θJC
40
2
Note: θJA is measured with the PCB copper area of approximately 1 in (Multi-layer). That need connect to
Exposed pad of the UTC UD05201.

UNIT
°C/W
°C/W
LX pin or
ELECTRICAL CHARACTERISTICS (VIN=VEN=3.6V, TA=25°C, unless otherwise specified)
PARAMETER
Supply Voltage Range
SYMBOL
VIN
Feedback Voltage
VFB
Feedback Bias Current
Quiescent Current
Shutdown Supply Current
Switching Current Limit
Line Regulation
Load Regulation
Oscillation Frequency
RDS(ON) of P-CH MOSFET
RDS(ON) of N-CH MOSFET
EN Pin Logic Input
Threshold Voltage
IFB
ICCQ
ISD
EN Pin Input Current
Efficiency
Thermal Shutdown
Thermal Shutdown Hysteresis
TEST CONDITIONS
TA=+25°C
TA=0°C ≤TA≤85°C
TA=-40°C ≤TA ≤85°C
VFB=0.65V
VFB=0.8V
VEN=0V
ILIMIT
△VOUT / VOUT
△VOUT / VOUT
FOSC
RDSON
RDSON
VENL
VENH
IEN
EFFI
TSD
TSH
VIN=2.6V~5.5V
IOUT= 0.01~2A
LX pin
VFB=0V,IOUT=1A
Guaranteed by design
VIN=5V, VOUT=3.3V,IOUT=1.5A
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
TYP
MAX
2.6
5.5
0.5880 0.6000 0.6120
0.5865 0.6000 0.6135
0.5820 0.6000 0.6180
±30
250
400
0.1
1
2.2
2.5
0.04
0.4
0.5
1
1
1.2
1.4
0.15
0.25
0.11
0.20
0.4
1.5
±0.1
±1
91
140
30
UNIT
V
V
V
V
nA
uA
uA
A
%/V
%
MHz
Ω
Ω
V
uA
%
°C
°C
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CMOS IC
FUNCTION DESCRIPTIONS
Operation
UTC UD05201A/B/C is a monolithic switching mode Step-Down DC-DC converter. It utilizes internal MOSFETs to
achieve high efficiency and can generate very low output voltage by using internal reference at 0.6V. It operates at a
fixed switching frequency, and uses the slope compensated current mode architecture. This Step-Down DC-DC
Converter supplies 2000mA output current at input voltage range from 2.6V to 5.5V.
Current Mode PWM Control
Slope compensated current mode PWM control provides stable switching and cycle-by-cycle current limit for
excellent load and line responses and protection of the internal main switch (P-CH MOSFET) and synchronous
rectifier (N-CH MOSFET). During normal operation, the internal P-CH MOSFET is turned on for a certain time to
ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor
current is above the error voltage. The current comparator, ICOMP limits the peak inductor current. When the main
switch is off, the synchronous rectifier will be turned on immediately and stay on until either the inductor current
starts to reverse, as indicated by the current reversal comparator, IZERO, or the beginning of the next clock cycle.

TYPICAL APPLICATION CIRCUIT
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 in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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