The LM5100A/B/C and LM5101A/B/C high-voltage gate drivers are designed to drive both the high-side and the low-side N-Channel MOSFETs in a synchronous buck or a half-bridge configuration. The floating high-side driver is capable of operating with supply voltages up to 100 V. The A versions provide a full 3-A of gate drive, while the B and C versions provide 2 A and 1 A, respectively. The outputs are independently controlled with CMOS input thresholds (LM5100A/B/C) or TTL input thresholds
(LM5101A/B/C).
An integrated high-voltage diode is provided to charge the high-side gate drive bootstrap capacitor. A robust level shifter operates at high speed while consuming low power and providing clean level transitions from the control logic to the high-side gate driver. Undervoltage lockout is provided on both the low-side and the high-side power rails. These devices are available in the standard SOIC-8 pin, SO PowerPAD-8 pin, and the WSON-10 pin packages. The LM5100C and LM5101C are also available in MSOP-PowerPAD-8 package. The LM5101A is also available in WSON-8 pin package.
PART NUMBER | INPUT THRESHOLD | PEAK OUTPUT CURRENT |
---|---|---|
LM5100A | CMOS | 3 A |
LM5101A | TTL | 3 A |
LM5100B | CMOS | 2 A |
LM5101B | TTL | 2 A |
LM5100C | CMOS | 1 A |
LM5101C | TTL | 1 A |
Changes from P Revision (March 2013) to Q Revision
Changes from O Revision (March 2013) to P Revision
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM5100A, LM5100C | WSON (10) | 4.00 mm × 4.00 mm |
SO PowerPAD™ (8) | 3.90 mm × 4.89 mm | |
SOIC (8) | 3.91 mm × 4.90 mm | |
LM5100B, LM5101B | WSON (10) | 4.00 mm × 4.00 mm |
SOIC (8) | 3.91 mm × 4.90 mm | |
LM5101A | WSON (8) | 4.00 mm × 4.00 mm |
WSON (10) | 4 .00mm × 4.00 mm | |
SO PowerPAD (8) | 3.90 mm × 4.89 mm | |
SOIC (8) | 3.91 mm × 4.90 mm | |
LM5101C | MSOP PowerPAD (8) | 3.00 mm × 3.00 mm |
WSON (10) | 4.00 mm × 4.00 mm | |
SOIC (8) | 3.91 mm × 4.90 mm |
PIN | I/O | DESCRIPTION | ||||
---|---|---|---|---|---|---|
NAME | 8 PINS | 10 PINS(1) | ||||
HB | 2 | 2 | I | High-side gate driver bootstrap supply. Connect the positive terminal of the bootstrap capacitor to HB and the negative terminal to HS. The bootstrap capacitor should be placed as close to the IC as possible. | ||
HI | 5 | 7 | I | High-side driver control input. The LM5100A/B/C inputs have CMOS type thresholds. The LM5101A/B/C inputs have TTL type thresholds. Unused inputs should be tied to ground and not left open. | ||
HO | 3 | 3 | O | High-side gate driver output. Connect to the gate of high-side MOSFET with a short, low inductance path. | ||
HS | 4 | 4 | — | High-side MOSFET source connection. Connect to the bootstrap capacitor negative terminal and the source of the high-side MOSFET. | ||
LI | 6 | 8 | I | Low-side driver control input. The LM5100A/B/C inputs have CMOS type thresholds. The LM5101A/B/C inputs have TTL type thresholds. Unused inputs should be tied to ground and not left open. | ||
LO | 8 | 10 | O | Low-side gate driver output. Connect to the gate of the low-side MOSFET with a short, low inductance path. | ||
VDD | 1 | 1 | I | Positive gate drive supply . Locally decouple to VSS using low ESR/ESL capacitor located as close to the IC as possible. | ||
VSS | 7 | 9 | — | Ground return. All signals are referenced to this ground. | ||
EP(2) | — | TI recommends that the exposed pad on the bottom of the package is soldered to ground plane on the PC board, and that ground plane should extend out from beneath the IC to help dissipate heat. |