AATIAN70 Datasheet, PDF (2/10 Pages) SiGe Semiconductor, Inc. – CMOS Low Voltage LDO Linear Regulator

EV-137
AAT3244 EVAL: 300mA Adjustable Dual
CMOS Low Voltage LDO Linear Regulator
V_OUT (V)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
R2 = 59kΩ
R1(kΩ)
19.6
29.4
39.2
49.9
59.0
68.1
78.7
R2 = 221kΩ
R1(kΩ)
75
113
150
187
221
261
301
V_OUT (V)
1.5
1.8
1.85
2.0
2.5
3.3
3.6
R2 = 59kΩ
R1(kΩ)
88.7
118
124
137
187
267
295
Table 2: AAT3244 Adjustable Resistor Values For LDO Regulator.
R2 = 221kΩ
R1(kΩ)
332
442
464
523
715
1000
1105
Test Equipment
1. Unit under test (UUT) is the AAT3244 Evaluation Board.
2. One (1) Keithley 2430 3A source meter or equivalent.
3. Two (2) XT30-2 power supplies or equivalent.
4. Two (2) 10Ω, 100W variable resistors, or two DC electronic loads.
5. Two (2) Fluke 189 DC voltmeters or equivalent. Set to DCV setting.
6. A HP33120A 15MHz function/ arbitrary waveform generator. Set to PWM setting.
7. Oscilloscope: Tektronix TDS3054B or equivalent, three (3) Tek P6139A oscilloscope voltage probes or
equivalent, and one Tektronix TCP202 300V 15A peak current probe.
8. Miscellaneous test leads (banana plug to clip lead type is recommended).
Setup and Test
Test: Line-Load Regulation
1. Configure the specified test equipment as shown in Figure 2.
2. Enable dual LDO by JP1 and JP3 to the ‘ON’ position, as shown in Figure 2. Connect both inputs of UUT
to VCC by JP2 and JP4 as shown in Figure 2.
3. Turn on the input power supply and set to desired input voltage based on the DC voltmeter.
4. Vary the output load from 0 to 300mA and vary the input voltage from 1.8V to 5.5V while monitoring the
output voltage.
2
EV-137.2007.08.1.0