AT1799S AIMTRON [Aimtron Technology], AT1799S Datasheet

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AT1799S

Manufacturer Part Number
AT1799S
Description
2A Step-Down Voltage Regulator
Manufacturer
AIMTRON [Aimtron Technology]
Datasheet

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Feature
Application
Block Diagram
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
8/23/2006 REV:1.1
Aimtron reserves the right without notice to change this circuitry and specifications.
4.75V to 16V Supply Voltage Operating
Range.
380KHz ±15% Fixed Switching Frequency.
Voltage-Mode PWM Step-Down Regulator.
Built-in Power MOSFET, Rds(on)≒100mΩ.
2A Output Current, Up to 91.9% Efficiency
1.215V±1.5% Internal Reference
Shutdown Current less than 20uA.
Thermal-Shutdown and Built-in Soft-Start.
Cycle-by-Cycle Current-Limit Protection.
Short Circuitry Protection.
Under-Voltage Lockout Protection.
Output Voltage Adjustable From 1.215V to
16V.
SOP-8 Package.
Distributed Power Systems
Battery Charger.
Palmtop Computers, PDAs.
DSL Modems
Fax: 886-3-563-0879
1
Description
AT1799 is a voltage-mode PWM step-down
DC-DC converter capable of driving up to 2A
loads over a wide input supply range with excellent
line and load regulation characteristics. High
efficiency is obtained through the use of a low
Rds(on) P-channel power switch.
It uses a fixed switching frequency up to 380KHz
thus allowing smaller sized components. The
output voltage level is user-programmable via an
external resistive voltage divider. The built-in
soft-start can reduce inrush current on the input
source at turn on.
The device also has built-in cycle-by-cycle
current-limit, thermal shutdown, under-voltage
lockout and an ON/OFF logic-control that can
power down the regulator to a shutdown mode. In
shutdown mode the regulator draws less than 20uA
of supply current. When a short circuit is detected
on the output , the device immediately change
switching frequency to 42 KHz and duty cycle is
limited to 5% to protect IC from damage.
AT1799 is available in SOP-8 package.
2A Step-Down Voltage Regulator
WWW:
Email:
http://www.aimtron.com.tw
service@aimtron.com.tw
AT1799

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AT1799S Summary of contents

Page 1

Feature ‧ 4.75V to 16V Supply Voltage Operating Range. ‧ 380KHz ±15% Fixed Switching Frequency. ‧ Voltage-Mode PWM Step-Down Regulator. ‧ Built-in Power MOSFET, Rds(on)≒100mΩ. ‧ 2A Output Current 91.9% Efficiency ‧ 1.215V±1.5% Internal Reference ‧ Shutdown Current ...

Page 2

... Pin Configuration Ordering Information Part number AT1799S AT1799S_GRE SOP-8,Green : Date Code * For more marking information, contact out sales representative directly Pin Descriptions Pin N0. Symbol Power Input. IN supplies power to the IC and Step-down converter switch. IN must be bypassed with a low-ESR capacitor. ...

Page 3

Absolute Maximum Ratings *1 Parameter voltage SW voltage FB, COMP voltage Quiescent current Thermal Resistance (Junction to ambient θ Junction Temperature (Tj) Lead Temperature (Soldering 10 sec) Storage Temperature ESD Susceptibility*3 1. Stresses beyond those listed under ...

Page 4

Electrical Characteristics Parameter Input operating voltage Input under-voltage lockout threshold UVLO hysteresis Quiescent Current Shutdown Current Oscillator Frequency Short-Circuit Frequency Feedback Regulation voltage FB Input Bias Current Current limit Maximum Duty Cycle Minimum Duty Cycle SW Switch On-Resistance SW Leakage ...

Page 5

Typical characteristics E ffic rre lta VIN=10V ...

Page 6

VIN=12V, Vout=5.0V, L=22uH, Iout=500mA to 2.0A Ch2:Vout, Ch4:Iout, Time:1ms/div VIN=7V to 14V, Vout=5.0V, L=22uH, Iout=200mA Ch2:Vout, Ch3:VIN, Time:0.5s/div 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator Load ...

Page 7

Typical Application Circuit 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator http://www.aimtron.com.tw WWW: service@aimtron.com.tw Email: 7 AT1799 ...

Page 8

General Description The AT1799 features a PWM step-down converter operating with a fixed switching frequency of 380 KHz and uses internal power MOSFET to provide maximum efficiency. The output voltage of the converter can be set as low as 1.215V ...

Page 9

Cycle-by-Cycle Over-Current Protection The AT1799 provides cycle-by-cycle over-current protection. Current limit is accomplished using a separate dedicated comparator. If the current sense amplifier output voltage is larger than current-limited threshold level, it will be immediately turned off power MOS. The ...

Page 10

Applications Information External components of step-down converter can be designed by performing simple calculations. It must be to follow regulation by the output voltage and the maximum load current, as well as maximum and minimum input voltages. Begin by selecting ...

Page 11

Feedback Resistor Network An external resistor divider is required to divide the output voltage down to the nominal reference voltage. Current drawn by the resistor network should be limited to maintain the overall converter efficiency. The maximum ...

Page 12

In the case of low-ESR electrolytic capacitors, Output ripple voltage drop caused by the switching current through the ESR of the output capacitor. The output ripple is estimated as: ≅ ∆ × ...

Page 13

No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 8/23/2006 REV:1.1 2A Step-Down Voltage Regulator http://www.aimtron.com.tw WWW: service@aimtron.com.tw Email: 13 AT1799 ...

Page 14

Outline 8-pin SOP INCHES SYMBOL MIN A 0.188 B 0.149 C 0.228 D 0.050 E 0.013 F 0.004 H 0.053 J 0.011 K 0.007 M 0.016 α 2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, ...

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