LP2203 POWER | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 8

Technical content

Features

‹ Wide Operating Voltage Ranges : 2.5V to 5.5V  ‹ Low-Noise for RF Application ‹ High PSRR 65dB at 1kHz ‹ No Noise Bypass Capacitor Required  ‹ Fast Response in Line/Load Transient ‹ TTL-Logic-Controlled Shutdown Input ‹ Dual LDO Outputs (200mA/200mA) ‹ High Output Accuracy 2% ‹ Ultra-low Quiescent Current 27uA ‹ Thermal Shutdown Protection ‹ Tiny USP-6 Package ‹ RoHS Compliant and 100% Lead (Pb)-Free

Applications

— CDMA/GSM Cellul ar Handsets — Smart mobile phone — Battery-Powered Equipment — DSC Sensor — Wireless Card Pin Configurations Marking Information Please see website. USP-6(Top View)

Preliminary Datasheet LP2203 L P 2 2 0 3 – 0 1 V e r . 1 . 1 D a t a s h e e t F e b . - 2 0 0 8 P a g e 2 o f 8 Functional Pin Description Pin No. Pin Name Pin Function

1 EN2 Chip Enable2 (Active High)

2 VIN Supply Input

3 EN1 Chip Enable1 (Active High)

4 GND Common Ground

5 VOUT1 Channel 1 Output Voltage

6 VOUT2 Channel2 Output Voltage

Preliminary Datasheet LP2203 L P 2 2 0 3 – 0 1 V e r . 1 . 1 D a t a s h e e t F e b . - 2 0 0 8 P a g e 3 o f 8 Absolute Maximum Ratings Power Dissipation, PD @ TA = 25°C Package Thermal Resistance ESD Susceptibility Recommended Operating Conditions

Electrical Characteristics

(VIN = VOUT + 1V, CIN = COUT = 1µF, TA = 25° C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units Output Voltage Accuracy ΔVOUT IOUT = 1mA −2 -- +2 % Maximum output Current Imax Continuous 200 250 mA Current Limit ILIM RLOAD = 1Ω 360 400 700 mA Quiescent Current IQ VEN ≥ 1.2V, IOUT = 0mA 75 110 μA I O U T = 3 0 m A , V O U T > 2.8V 30 45 Dropout Voltage VDROP IOUT = 150mA, VOUT > 2.8V 80 150 mV Line Regulation ΔVLINE VIN = (VOUT + 1V) to 5.5V, IOUT = 1mA 0.3 % Load Regulation ΔLOAD 1mA < IOUT < 300mA 0.6 % Standby Current ISTBY VEN = GND, Shutdown 0.01 1 μA EN Input Bias Current IIBSD VEN = GND or VIN 0 100 nA Logic-Low Voltage VIL VIN = 3V to 5.5V, Shutdown 0.4 EN Threshold Logic-High Voltage VIH VIN = 3V to 5.5V, Start-Up 1.2 V Output Noise Voltage 10Hz to 100kHz, IOUT = 200mA COUT = 1µF 100 uVRMS Power Supply f = 100Hz PSRR −75 Rejection Rate f = 10kHz COUT = 1µF, I O U T = 1 0 m A −65 dB Thermal Shutdown Temperature TSD 165 °C

Preliminary Datasheet LP2203 L P 2 2 0 3 – 0 1 V e r . 1 . 1 D a t a s h e e t F e b . - 2 0 0 8 P a g e 4 o f 8 Typical Operating Characteristics

Preliminary Datasheet LP2203 L P 2 2 0 3 – 0 1 V e r . 1 . 1 D a t a s h e e t F e b . - 2 0 0 8 P a g e 5 o f 8

Preliminary Datasheet LP2203 LP2203 – 01 Ver. 1.1 Datasheet F e b . - 2 0 0 8 P a g e 6 o f 8 Applications Information Like any low-dropout regulator, the external capacitors used with the LP2203 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1µF on the LP2203 input and the amount of capacitance can be increased without limit. The input capacitor must be located a distance of not more than 0.5 inch from the input pin of the IC and returned to a clean analog ground. Any good quality ceramic or tantalum can be used for this capacitor. The capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-transient response. The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs application. The LP2203 is designed specifically to work with low ESR ceramic output capacitor in space-saving and performance consideration. Using a ceramic capacitor whose value is at least 1µF with ESR is > 25mΩ on the LP2203 output ensures stability. The LP2203 still works well with output capacitor of other types due to the wide stable ESR range. Figure 1 shows the curves of allowable ESR range as a function of load current for various output capacitor values. Output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and PSRR. The output capacitor should be located not more than 0.5 inch from the VOUT pin of the LP2203 and returned to a clean analog ground. Start-up Function Enable Function The LP2203 features an LDO regulator enable/disable function. To assure the LDO re gulator will switch on, the EN turn on control level must be greater than 1.2 volts. The LDO regulator will go into the shutdown mode when the voltage on the EN pin falls below 0.4 volts. For to protecting the system, the LP2203 have a quick-discharge function. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. Thermal Considerations Thermal protection limits power dissipation in LP2203. When the operation junction temperature exceeds 165°C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turn on again after the junction temperature cools by 30°C. For continue operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is : PD = (VIN−VOUT) x IOUT + VIN x IQ The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : PD(MAX) = ( TJ(MA X) − TA ) /θJA Where TJ(MAX) is the maximum operation junction

Preliminary Datasheet LP2203 LP2203 – 01 Ver. 1.1 Datasheet F e b . - 2 0 0 8 P a g e 7 o f 8 temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of LP2203, where TJ(MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θJA is layout dependent) for USP-6 package is 250°C/W. PD(MAX) = (125°C−25°C) / 250 = 400mW (USP-6) PD(MAX) = (125°C−25°C) / 165 = 606mW The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA.

Preliminary Datasheet LP2203 L P 2 2 0 3 – 0 1 V e r . 1 . 1 D a t a s h e e t F e b . - 2 0 0 8 P a g e 8 o f 8 Packaging Information