User’s Guide May 2003 Power Management Products Low Power SLVU064A
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
DYNAMIC WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 1.8 – 3.3 V and the output current range of 0 mA to10 mA. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Preface About This Manual This user’s guide describes the TPS79733EVM LDO regulator evaluation module. Each EVM contains an SLVP199 test board with a TPS79733DCK regulator as well as supporting passive components. The EVM provides a convenient method of evaluating the performance of the TPS797xx linear regulator family as well as other SC–70/SOT–323 packaged linear regulators with the similar pin-out.
vi
Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 TPS797xx Family of LDO Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 EVM Design Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Schematic . . . . . . . . . . . . . . . . . . . . . .
viii
Chapter 1 Introduction This user’s guide describes the TPS79733EVM LDO regulator evaluation module. Each EVM package contains an SLVP199 test board with a TPS79733DCK low dropout linear regulator as well as supporting passive components. Topic Page 1.1 TPS797xx Family of LDO Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2 1.2 EVM Design Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2 1.3 Schematic . . . . . . . . . . . . . . . .
TPS797xx Family of LDO Regulators 1.1 TPS797xx Family of LDO Regulators The TPS797xx family of LDO regulators consists of small SOT–323/PICO packaged regulators capable of delivering 10 mA of output current. Features of the part include: - 10-mA low dropout regulator - Ultralow 1.2-µA quiescent current at 10 mA - 5-pin SC–70/SOT–323 (DCK) package - Integrated power good output - Stable with any capacitor (>0.
Schematic 1.3 Schematic Figure 1–1 shows the SLVP199 PCB schematic diagram, which is used in the TPS79733EVM. Figure 1–1. TPS79733EVM Schematic Diagram J4 R1 PG 100kΩ C2 1 µF TPS79733DCK 1 NC PG J2 2 GND 3 OUT J3 5 VO GND NC IN J1 4 VI C1 0.1 µF 1.4 Bill of Materials Table 1–1 lists materials required for the TPS79733 EVMs. Table 1–1. TPS79733EVM Bill of Materials Qty Ref Des Description Size MFR Part Number 1 C1 Capacitor, ceramic, 0.1-µF, 6.
Board Layout 1.5 Board Layout Figures 1–2 and 1-3 show the board layout of the SLVP199 PCB used for the TPS79733EVM. Figure 1–2. Top Layer Figure 1–3.
Board Layout Figure 1–4.
1-6 Introduction
Chapter 2 EVM Test Setup This chapter provides recommended test equipment and procedure for performing evaluations using the TPS79733EVM. Figure 2–1 shows the test setup. Figure 2–1.
The settings for the test equipment shown in Figure 2–1 are described below: - Function generator is set to output a 5.5-V square wave with rise and fall times of 2 ms, top width of 5 ms, and a period of 1 ms. - Power amplifier is set to a gain of 1 dB and a minimum slew rate of 2500 V/µs. - Power supply capable of ±10-V swing and a 0.5-A current limit to power the power amplifier.
Chapter 3 Test Results This chapter gives laboratory test results of the TPS79733EVM obtained for the recommended test procedures in Chapter 2. Figure 3–1 shows the input voltage ramp from 0 to 5.5 V (CH1), the 3.3-V regulated output voltage (CH2), the PG signal (CH3), and 10-mA output current (CH4). The scale on CH4 is 10 mA/div. Figure 3–1.
3-2 Test Results
