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PT1102 Datasheet

Step-down DC-DC Converter

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PT1102
Step-down DC-DC Converter
GENERAL DESCRIPTION
The PT1102 is a CMOS-based fixed frequency step-down DC/DC converter with a built-in internal power MOSFET. It
achieves 1A continuous output current over a wide input supply range with excellent load and line regulation. It requires a
minimum number of readily available external components to complete a 1A step down DC to DC converter solution with
low ripple and high efficiency. The output voltage can be adjusted with external resisters.
With the enhanced voltage mode operation, the PT1102 achieves good loop stability with wide operating range. Under light
load conditions, the PT1102 automatically switches to a VFM mode to improve efficiency. Fault condition protection
includes current limiting and thermal shutdown. Furthermore, the PT1102 has a built-in UVLO function that prevents the
output from being unstable when the input voltage becomes too low.
The PT1102 is available in SOP8 packages.
FEATURES
z Wide Range Of Input Voltage: 2.5V~18V
z Oscillation Frequency: 500kHz
z Standby Current: Typical 0.1µA
z High Efficiency: Typical 88%
z Low Temp. Coefficient of Feedback Voltage:
Typical ±100ppm/
z Built-in Soft-start and UVLO
z Thermal Shutdown
z Package: SOP-8
APPLICATIONS
z Distributed Power Systems
z Battery Chargers
z Pre-regulator for linear Regulators
TYPICAL APPLICATION CIRCUIT
L: CR105-270MC (Sumida, 27µH) or Equivalent
SD: RB063L-30(Rohm) or Equivalent
C1: 4.7µF, Ceramic Type
R1: 10k
R2: 40k(For 5V Output)
C2: 1nF, Ceramic Type
C3: 47µF, Tantalum Type
KEY PERFORMANCE CHART
Efficiency vs. Output Current
100
90
80
70
60
50
40
30
20
10
0
1
Vin=6.5V, Vout=3.3V
Vin=10V, Vout=6V
Vin=15V, Vout=9V
Out1p0ut Current 1(0m0 A)
500
ORDERING INFORMATION
Package
SOP8
Temperature
-40to 85
Part Number
PT1102ESOH
Transport Media
Tape and Reel
China Resources Powtech (Shanghai) Limited
PT1102_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 1




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PT1102 Datasheet Preview

PT1102 Datasheet

Step-down DC-DC Converter

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PACKAGES
PT1102
Step-down DC-DC Converter
PIN DESCRIPTIONS
Names
CE
VIN
LX
GND
FB
N.C
Pin No.
1
3
6
7
8
2, 4, 5
Description
Chip Enable. Active with “H”
Power Supply
Output of Internal Power Switch
Ground
Feedback Voltage
Not Connected
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED
OPERATING
(Note 1)
Symbol
VIN
VLX
VCE
VFB
ILX
TOPT
TSTG
Parameter
VIN Supply Voltage
LX Pin Output Voltage
CE Pin Input Voltage
VFB PIN Input Voltage
LX Pin Output Current
Operation Temperature
Range
Storage Temperature
Range
Value
20V
-0.3~VIN +0.3V
-0.3~VIN +0.3V
-0.3~6V
1.5A
-40~85
-55~125
RANGE(Note 2)
Symbol
VIN
VLX
VCE
VFB
ILX
Parameter
VIN Supply Voltage
LX Pin Output Voltage
CE Pin Input Voltage
VFB PIN
Voltage
Input
LX Pin Output Current
Value
5~18V
-0.3~VIN +0.3V
-0.3~VIN +0.3V
-0.3~5.5V
1.5A
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Recommended operating Range indicates conditions for which the device is functional, but does not guarantee specific
performance limits.
China Resources Powtech (Shanghai) Limited
PT1102_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 2


Part Number PT1102
Description Step-down DC-DC Converter
Maker PowTech
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