Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- RECOMMENDED OPERATING CONDITIONS
- THERMAL INFORMATION
- PACKAGE SPECIFICATIONS
- ELECTRICAL CHARACTERISTICS
- DEVICE INFORMATION
- TYPICAL CHARACTERISTICS (PVIN = VIN = 12 V) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to devices soldered directly to a 100 mm × 100 mm six-layer PCB with 1 oz. copper. Applies to , , and .
- TYPICAL CHARACTERISTICS (PVIN = VIN = 5 V) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to devices soldered directly to a 100 mm × 100 mm six-layer PCB with 1 oz. copper. Applies to , , and .
- APPLICATION INFORMATION
- ADJUSTING THE OUTPUT VOLTAGE
- Frequency Select
- CAPACITOR RECOMMENDATIONS FOR THE LMZ31530 POWER SUPPLY
- Transient Response
- Transient Waveforms Device configured for FCCM mode of operation, (pin 3 connected to pin 19).
- Application Schematics
- VIN and PVIN Input Voltage
- 3.3 V PVIN Operation
- Power Good (PWRGD)
- Slow Start (SS_SEL)
- Auto-Skip Eco-Mode / Forced Continuous Conduction Mode
- Power-Up Characteristics
- Pre-Biased Start-Up
- Remote Sense
- Output On/Off Inhibit (INH)
- Overcurrent Protection
- Current Limit (ILIM) Adjust
- Thermal Shutdown
- Layout Considerations
- EMI
- Revision History
LMZ31530
www.ti.com
SLVSBC7B –OCTOBER 2013–REVISED DECEMBER 2013
PIN DESCRIPTIONS (continued)
TERMINAL
DESCRIPTION
NAME NO.
11
22
23
24
Phase switch node. Do not place any external component on these pins or tie them to a pin of another
PH 25
function. Connect these pins using a copper area beneath pad 71.
26
27
28
71
42
43
PVIN 44 Input switching voltage pin. This pin supplies voltage to the power switches of the converter.
66
69
Power Good flag pin. This open drain output asserts low if the output voltage is more than approximately
PWRGD 19
±6% out of regulation.
Power Good pull-up pin. This pin is connected to a 100kΩ resistor which is tied to the PWRGD pin internally.
PWRGD_PU 18
Connect this pin to V5V or to any voltage between 1.3V and 6.5V.
Remote sense connection. Connect this pin to VOUT at the load for improved regulation. This pin must be
SENSE+ 14
connected to VOUT at the load, or at the module pins.
Slow-start select pin. Connect a resistor between this pin and PWRGD (or PGND) to select the slow-start
time. See the SS_SEL section of the datasheet for slow-start times and corresponding resistor values.
SS_SEL 3
Connect the SS_SEL pin to PGND to select Auto-skip Eco-mode or to the PWRGD pin (pin 19) to select
FCCM.
V5V 61 5V regulator pin. This regulator supplies the internal circuitry.
VADJ 13 Output voltage adjust pin. Connecting a resistor between this pin and AGND sets the output voltage.
2
VIN Input bias voltage pins. Supplies the control circuitry of the power converter.
15
10
52
53
54
55
Output voltage. These pins are connected to the internal output inductor. Connect these pins to the output
VOUT 56
load and connect external bypass capacitors between these pins and PGND.
57
58
59
60
68
Copyright © 2013, Texas Instruments Incorporated 7
Product Folder Links: LMZ31530