TS1537A/B/C Dual 1A Low Dropout Positive Voltage Regulator Pin assignment: 1. Input 2 2. Input 1 3. Ground 4. Output 1 (3.3V/2.5V) 5. Output 2 (2.5V/1.8V) Dual Output for 3.3V, 2.5V or 1.8V Low Dropout Voltage 1.3V max. General Description The TS1537A, TS1537B & TS1537C are low dropout positive voltage regulators with minimum of 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V/2.5V (TS1537A) or 3.3V/1.8V(TS1537B) or 2.5V/1.8V(TS1537C) logic supply. This series are guaranteed to have less 1.4V dropout at full load current making it ideal to provide well regulated outputs dual channels with up to 12V input supply. This series is offered in 5-pin TO-263-5L package. Features Low dropout performance 1.3V max. Build-in thermal shutdown each channel Full current rating over line and temperature. Output current limiting for each channel Fast transient response Good noise rejection ±2%Total output regulation over line, load and Channel 1=3.3V (TS1537A/B) or 2.5V (TS1537C) temperature Block Diagram (each channel) Channel 2=2.5V (TS1537A) or 1.8V (TS1537B/C) Ordering Information Operating Temp. Part No. (Ambient) Package TS1537ACM5 -0 ~ +85 oC TS1537BCM5 TO-263-5L TS1537CCM5 Note: TS1537A is ch1=3.3V, ch2=2.5V, TS1537B is ch1=3.3V, ch2=1.8V. TS1537C is ch1=2.5V, ch2=1.8V. Absolute Maximum Rating Input Supply Voltage Vin 12 V Vin (operate) 10 V Power Dissipation PD Internally Limited W Operating Junction Temperature Range TJ 0 ~ +150 o C -65 ~ +150 o C Operation Input Supply Voltage Storage Temperature Range TSTG Lead Soldering Temperature (260 oC) TS1537A/B/C 10 1-5 S 2003/12 rev. B Electrical Characteristics Ta = 25 oC, unless otherwise specified. Parameter Output Voltage Conditions Typ Max Unit V TS1537A/B-Vout 1 4.8V ≤ Vin ≤ 7V, Io=10mA 3.267 3.3 3.366 TS1537A/C-Vout 2/1 4V ≤ Vin ≤ 7V, Io=10mA 2.475 2.5 2.550 TS1537B/C-Vout 2 4V ≤ Vin ≤ 7V, Io=10mA 1.782 1.8 1.836 -- -- 10 V -- 0.015 0.2 % -- 0.5 1.0 % Input Supply Voltage Vout+1.5V ≤ Vin ≤ 7V, Io=10mA Line Regulation Load Min Regulation (note 1,2) Vout 1 Vin=5V, 10mA ≤ Io ≤ 1A Vout 2 Vin=4V, 10mA ≤ Io ≤ 1A V Dropout Voltage Io=1A, ∆Vout=0.1%Vout -- 1.3 1.4 V Minimum Load Current 0 oC ≤ Tj ≤ 125 oC, (note 3) -- 8 10 mA Thermal Regulation Ta=25 oC, 30mS pulse -- 0.008 0.04 uA Current Limit Vin - Vout=3V 1.1 -- -- A Temperature Stability Io=10mA -- 0.5 -- % -- 60 70 dB Ripple Rejection F = 120Hz, Io=1A Cout=25uF, Vin=Vout + 3V Thermal Performance Condition Package type Typ TO-263-5L 85 Thermal Resistance Junction to Ambient Unit o C/W Note 1: See thermal regulation specification for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the package. Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the input / output voltage difference and the output current. Guaranteed maximum power dissipation will not be available over the full input / output voltage range. Note 3: Quiescent current is defined as the minimum output current required to maintain the regulation. TS1537A/B/C 2-5 2003/12 rev. B Typical Application Circuit “A” version “B” version “C” version TS1537A/B/C 3-5 2003/12 rev. B Electrical Characteristics Curve (each channel) Figure 1: dropout voltage v.s. output current Figure 2: load regulation v.s. temp. Figure 3: output change v.s. temp. Figure 4: line regulation Figure 5: line transient response Figure 6: load transient response TS1537A/B/C 4-5 2003/12 rev. B TO-263-5L Mechanical Drawing A E F J B I C G D TS1537A/B/C H 5-5 DIM A B C D E F G H I J TO-263-5L DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 10.220 14.600 0.750 1.573 4.560 1.240 2.280 0.280 8.240 1.540 10.260 15.870 0.770 1.827 4.570 1.270 2.790 0.320 8.280 1.800 0.402 0.575 0.030 0.062 0.179 0.049 0.090 0.011 0.324 0.060 2003/12 rev. B 0.404 0.625 0.030 0.072 0.180 0.050 0.110 0.013 0.326 0.071