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PT1101 Datasheet

PWM/VFM Step-down DC-DC Controller

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PT1101
PWM/VFM Step-Down DC/DC Controller
GENERAL DESCRIPTION
The PT1101 Series are CMOS-based PWM step-down DC/DC Controllers with low supply current. A low
ripple, high efficiency step-down DC/DC converter can be easily composed of with additional several external
components such as a power-transistor, an inductor, a diode and capacitors. Output voltage is fixed or can be
adjusted with external resisters. (PWM/VFM alternative circuit is disabled in adjustable types)
The PT1101 Series consist of a PWM control circuit, a high precision band-gap voltage reference, a soft-start
circuit, a protection circuit, a PWM/VFM alternative circuit, an oscillator, an error amplifier with internal
compensation network and input/output voltage detection circuits.
With its internal state-of-art control algorithm, the PT1101 Series based DC/DC converter can achieve high
performance while maintaining stability. For example, with its PWM/VFM alternative circuit, when the load current
is small, the operation is automatically switched into the VFM mode to improve the efficiency. Further, if the term of
maximum duty cycle keeps on a certain time, the embedded protection circuits restart the operation with soft-start
and repeat until the maximum duty cycle condition is released. Finally, built-in UVLO function blocks potentially
unstable output when the input voltage is equal or less than UVLO threshold and makes this IC standby for low
power consumption.
FEATURES
z Wide Range Of Input Voltage: 2.5V~18V
z Built-in Soft-start and Protection Function
z High Efficiency: Typ. 90%
z Oscillation Frequency: 500kHz
z High Accuracy Output Voltage: ±2%
z Low Temperature Coefficient of Output Voltage:
Typ. ±100ppm/
z Standby Current: Typ. 0.1µA
z Output Voltage: Stepwise Setting with a step
of 0.1V in the range of 1.2V to 6.0V as fixed
voltage type. Reference Voltage of Adjustable
type is 1.0V.
z Small Package: SOT-23-5
z CMOS Output Capability
APPLICATION
z Hand-held communication equipment, cameras, video instruments such as VCRs, camcorders
z Battery-powered equipment
z Household electrical appliances
BLOCK DIAGRAM
PWM
Ramp
errAmp
Vref
Vref
PWM
Ramp
errAmp
Vref
Vref
Fixed Output Voltage Type
China Resources Powtech (Shanghai) Limited
PT1101_DS Rev EN_2.0
Adjustable Output Voltage Type
WWW.CRPOWTECH.COM
Page 1




PowTech

PT1101 Datasheet Preview

PT1101 Datasheet

PWM/VFM Step-down DC-DC Controller

No Preview Available !

PT1101
PWM/VFM Step-Down DC/DC Controller
ORDERING INFORMATION
In PT1101 series, the output voltage can be identified from its part number as shown below:
PT1101E23E-xx
xx stands for output voltage
Note: As for adjustable output voltage type, xx equals to 10.
Package
Temperature
R
Part Number
PT1101E23E-10
SOT-23-5
-40to 125
PT1101E23E-18
PT1101E23E-33
PT1101E23E-50
Contents
Adjustable Output Voltage
Without PWM/VFM alternative
1.8V Fixed Output Voltage
With PWM/VFM alternative circuit
3.3V Fixed Output Voltage
With PWM/VFM alternative circuit
5.0V Fixed Output Voltage
With PWM/VFM alternative circuit
Transport Media
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
PIN CONFIGURATION
PIN DESCRIPTIONS
Names
CE
GND
VOUT / (VFB)
EXT
VIN
Pin No.
1
2
3
4
5
Description
Chip Enable. Active with “H”
Ground
Output Voltage (Feedback Voltage for adjustable output voltage type)
External Transistor Driver Pin (CMOS output)
Power Supply
China Resources Powtech (Shanghai) Limited
PT1101_DS Rev EN_2.0
WWW.CRPOWTECH.COM
Page 2


Part Number PT1101
Description PWM/VFM Step-down DC-DC Controller
Maker PowTech
Total Page 11 Pages
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