Inductor and boot capacitor integration
The TLVM236x5 is a 1.5A or 2.5A, 36V input synchronous step-down DC/DC power module that combines flip chip on lead (FCOL) packaging, power MOSFETs, integrated inductor and boot capacitor in a compact and easy-to-use 3.5mm × 4.5mm × 2mm, 11-pin QFN package. The small HotRod™ QFN package technology enhances the thermal performance, ensuring high ambient temperature operation. devices can be configured for 1V up to 6V output with a resistor feedback divider.
The TLVM236x5 is specifically designed to meet low standby power requirements for always on, industrial applications. Auto mode enables frequency fold back when operating at light loads, allowing a no load current consumption of 1.5µA at 13.5V VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with low MOSFET on resistances provide exceptional efficiency across the entire load range.
The TLVM236x5 uses peak current mode architecture with internal compensation to maintain stable operation with minimal output capacitance. The RT pin can be used to set the frequency between 200kHz and 2.2MHz to avoid noise sensitive frequency bands.
PART NUMBER | PACKAGE (1) | PACKAGE SIZE(2) |
---|---|---|
TLVM23615 | RDN (QFN-FCMOD, 11) | 3.50mm × 4.50mm |
TLVM23625 |
DEVICE | ORDERABLE PART NUMBER (1) | FSW | OUTPUT VOLTAGE | OUTPUT CURRENT | EXTERNAL SYNC (MODE Configuration) |
SPREAD SPECTRUM |
---|---|---|---|---|---|---|
TLVM23615 | TLVM23615RDNR | Adjustable with RT resistor |
Adjustable (1 V to 6 V) |
1.5 A | No (Default PFM at light load) |
No |
TLVM23625 | TLVM23625RDNR | Adjustable with RT resistor |
Adjustable (1 V to 6 V) |
2.5 A | No (Default PFM at light load) |
No |
PIN | TYPE | DESCRIPTION | ||
---|---|---|---|---|
NO. | NAME | |||
1 | PGOOD | A | Power-good monitor. Open-drain
output that asserts low if the feedback voltage is not within the specified window
thresholds. A 10-kΩ to 100-kΩ pullup resistor is required to a suitable pullup
voltage. If not used, this pin can be left open or connected to GND. High = power OK, Low = power bad. PGOOD pin goes low when EN = Low. |
|
2 | EN | A | Precision enable input pin. High = ON, Low = OFF. Can be connected to VIN. Precision enable allows the pin to be used as an adjustable UVLO. Can be connected directly to VIN. The module can be turned off by using an open-drain or collector device to connect this pin to GND. An external voltage divider can be placed between this pin, GND, and VIN to create an external UVLO.Do not float this pin. | |
3 | VIN | P | Input supply voltage. Connect the input supply to these pins. Connect a high-quality bypass capacitor or capacitors directly to this pin and GND in close proximity to the module. Refer to Section 8.5.2 for input capacitor placement example. | |
4 | VOUT | P | Output voltage. The pin is connected to the internal output inductor.
Connect the pin to the output load and connect external output capacitors between
the pin and GND. |
|
5, 6 | SW | P | Power module switch node. Do not place any external component on this pin or connect to any signal. The amount of copper placed on these pins must be kept to a minimum to prevent issues with noise and EMI. | |
7 | BOOT | P | Bootstrap pin for internal high-side driver circuitry. A 100-nF bootstrap capacitor is internally connected from this pin to SW within the module to provide the bootstrap voltage. | |
8 | VCC | P | Internal LDO output. Used as supply to internal control circuits. Do not connect to external loads. Can be used as logic supply for power-good flag. Connect a high-quality 1-µF capacitor from this pin to GND. | |
9 | FB |
A | Feedback input. For the adjustable
output, connect the mid-point of the feedback resistor divider to this pin. Connect
the upper resistor (RFBT) of the feedback divider to VOUT at the desired
point of regulation. Connect the lower resistor (RFBB) of the feedback
divider to GND. When connecting with feedback resistor divider, keep this FB trace
short and as small as possible to avoid noise coupling. See Section 8.5.2 for a feedback
resistor placement. |
|
10 | GND | G | Power ground terminal. Connect to system ground. Connect to CIN with short, wide traces. | |
11 | RT | A | When the part is configured as
the RT pin variant, the switching frequency in the part can be adjusted from 200
kHz to 2.2 MHz based on the resistor value connected between RT and GND. |
|
A = Analog, P = Power, G = Ground |