SNVSCI2B February 2023 – February 2024 TLVM23615 , TLVM23625
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Device Comparison Table
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Input Voltage Range
- 7.3.2 Output Voltage Selection
- 7.3.3 Input Capacitors
- 7.3.4 Output Capacitors
- 7.3.5 Enable, Start-Up, and Shutdown
- 7.3.6 Switching Frequency (RT)
- 7.3.7 Power-Good Output Operation
- 7.3.8 Internal LDO, VCC and VOUT/FB Input
- 7.3.9 Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
- 7.3.10 Soft Start and Recovery from Dropout
- 7.3.11 Overcurrent Protection (Hiccup Mode)
- 7.3.12 Thermal Shutdown
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Custom Design With WEBENCH® Tools
- 8.2.2.2 Choosing the Switching Frequency
- 8.2.2.3 Setting the Output Voltage
- 8.2.2.4 Input Capacitor Selection
- 8.2.2.5 Output Capacitor Selection
- 8.2.2.6 VCC
- 8.2.2.7 CFF Selection
- 8.2.2.8 Power-Good Signal
- 8.2.2.9 Maximum Ambient Temperature
- 8.2.2.10 Other Connections
- 8.2.3 Application Curves
- 8.3 Best Design Practices
- 8.4 Power Supply Recommendations
- 8.5 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
- RDN|11
Thermal pad, mechanical data (Package|Pins)
Orderable Information
7.3.6 Switching Frequency (RT)
The select orderables in the TLVM236x5 family with the RT pin allow power designers to set any desired
operating frequency between 200 kHz and 2.2 MHz in their applications. See Figure 7-6 to determine the
resistor value needed for the desired switching frequency or simply select from
Table 7-5. The RT pin
and the
MODE/SYNC pin variants share the same pin
location. The power supply designer can either use the RT pin variant and adjust
the switching frequency of operation as warranted by the application or use the
MODE/SYNC variant and synchronize to an external clock signal. See Table 7-4 for selection on
programming the RT pin.
| RT INPUT | SWITCHING FREQUENCY |
|---|---|
| VCC | 1 MHz |
| GND | 2.2 MHz |
| RT to GND | Adjustable according to Figure 7-6 |
| Float (Not Recommended) | No Switching |
where
- RT is the frequency setting resistor value (kΩ).
- FSW is the switching frequency (kHz).
Figure 7-6 RT Values
vs FrequencyThe switching frequency must be selected based on the output voltage setting of the device. See Table 7-5 for RRT resistor values and the allowable output voltage range for a given switching frequency for common input voltages.
| FSW (kHz) | RRT (kΩ) | VIN = 5 V | VIN = 12 V | VIN = 24 V | VIN = 36 V | ||||
|---|---|---|---|---|---|---|---|---|---|
| VOUT RANGE (V) | VOUT RANGE (V) | VOUT RANGE (V) | VOUT RANGE (V) | ||||||
| MIN | MAX | MIN | MAX | MIN | MAX | MIN | MAX | ||
| 200 | 81.6 | 1 | 1.75 | 1 | 1.5 | 1 | 1.25 | 1 | 1.25 |
| 400 | 40.2 | 1 | 2 | 1 | 4 | 1 | 3 | 1.25 | 2.5 |
| 600 | 26.7 | 1 | 2.5 | 1 | 5 | 1.25 | 5 | 2 | 4 |
| 800 | 19.8 | 1 | 3 | 1 | 5.5 | 1.5 | 6 | 2.25 | 6 |
| 1000 | 15.8 | 1 | 3.5 | 1 | 6 | 2 | 6 | 2.5 | 6 |
| 1200 | 13.2 | 1 | 3.5 | 1.5 | 6 | 2.5 | 6 | 3 | 6 |
| 1400 | 11.3 | 1 | 3.5 | 1.5 | 6 | 3 | 6 | 3.5 | 6 |
| 1600 | 9.76 | 1 | 3.5 | 1.5 | 6 | 3 | 6 | 4 | 6 |
| 1800 | 8.66 | 1 | 3 | 1.5 | 6 | 3.5 | 6 | 5 | 6 |
| 2000 | 7.77 | 1 | 3 | 1.5 | 6 | 3.5 | 6 | 5.5 | 6 |
| 2200 | 7.06 | 1 | 3 | 1.5 | 6 | 4.5 | 6 | 6 | 6 |