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MAX17634CATP+T
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Analog Devices Inc Maxim Integrated DC-DC Converters, TQFN-20(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
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PCB Footprint
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Datasheet
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README
markdownMAX17634CATP+T
Analog Devices Inc Maxim Integrated · DC-DC Converters · TQFN-20(4x4)
MAX17634CATP+T from Analog Devices Inc Maxim Integrated, in a TQFN-20(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PGND | power_in | Power ground pin of the converter that must be connected externally to the power ground plane. |
| 2 | IN | power_in | Power-supply input pin with a 4.5V to 36V input supply range, to be decoupled to PGND with a minimum of 4.7µF placed close to the IN and PGND pins. |
| 3 | IN | power_in | Power-supply input pin with a 4.5V to 36V input supply range, to be decoupled to PGND with a minimum of 4.7µF placed close to the IN and PGND pins. |
| 4 | EN/UVLO | input | Enable/undervoltage-lockout pin that enables the output when driven above VENR, disables the device when pulled below VENF, and sets the turn-on input voltage through a resistor divider between IN and SGND. |
| 5 | RESET | output | Open-drain reset output that is driven low when FB drops below 92% of its set value and goes high 1024 cycles after FB rises above 95% of its set value. |
| 6 | INTVCC | power_out | 5V LDO output that must be bypassed to SGND with a 2.2µF ceramic capacitor, and the LDO does not support external loading. |
| 7 | SGND | power_in | Analog ground pin of the device, which the exposed pad must be connected to. |
| 8 | SS | passive | Soft-start input where a capacitor connected from SS to SGND sets the soft-start time. |
| 9 | FB | input | Feedback input that connects to VOUT for the MAX17634A and MAX17634B, or to the center of an external resistor divider from the output to SGND for the MAX17634C. |
| 10 | RT | input | Programmable switching-frequency input where a resistor from RT to SGND sets the frequency between 400kHz and 2.2MHz, and leaving RT open selects the default 500kHz. |
| 11 | MODE/SYNC | input | Mode-selection pin that selects PWM operation when connected to SGND, DCM when connected to INTVCC, and PFM when left open, and that can also accept an external clock for synchronization. |
| 12 | EXTVCC | power_in | External power supply input that reduces internal LDO loss and should be connected to the buck output only when programmed to 5V, otherwise connected to SGND. |
| 13 | NC | unconnected | No connection. |
| 14 | IN | power_in | Power-supply input pin with a 4.5V to 36V input supply range, to be decoupled to PGND with a minimum of 4.7µF placed close to the IN and PGND pins. |
| 15 | PGND | power_in | Power ground pin of the converter that must be connected externally to the power ground plane. |
| 16 | NC | unconnected | No connection. |
| 17 | LX | output | Switching node pin that connects to the switching side of the inductor. |
| 18 | LX | output | Switching node pin that connects to the switching side of the inductor. |
| 19 | LX | output | Switching node pin that connects to the switching side of the inductor. |
| 20 | BST | passive | Boost flying capacitor pin where a 0.1µF ceramic capacitor is connected between BST and LX. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc Maxim Integrated |
| Package | TQFN-20(4x4) |
| Category | Power Management (PMIC) |
| Pins | 21 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| IN to PGND | -0.3 | 40 | V | 2 | |||
| EXTVCC to SGND | -5.5 | 6.5 | V | 2 | |||
| BST to PGND | -0.3 | 46.5 | V | 2 | |||
| BST to LX | -0.3 | 6.5 | V | 2 | |||
| BST to INTVCC | -0.3 | 40 | V | 2 | |||
| FB to SGND (MAX17634C) | -0.3 | 6.5 | V | 2 | |||
| SS, MODE/SYNC, RESET, INTVCC, RT to SGND | -0.3 | 6.5 | V | 2 | |||
| PGND to SGND | -0.3 | 0.3 | V | 2 | |||
| LX Total RMS Current | -4.7 | 4.7 | A | 2 | |||
| Operating Temperature Range | -40 | 125 | °C | 2 | |||
| Junction Temperature | -40 | 150 | °C | 2 | |||
| Input Voltage Range | VIN | 4.5 | 36 | V | 3 | ||
| Input Shutdown Current | IIN-SH | 2.8 | 4.5 | μA | VEN/UVLO = 0V (Shutdown mode) | 3 | |
| Input Quiescent Current, DCM Mode | IQ_DCM | 1.2 | 1.8 | mA | DCM Mode, VLX = 0.1V | 3 | |
| EN Threshold rising | VENR | 1.19 | 1.215 | 1.26 | V | VEN/UVLO rising | 3 |
| EN Threshold falling | VENF | 1.068 | 1.09 | 1.131 | V | VEN/UVLO falling | 3 |
| EN Input Leakage Current | IEN | -50 | 0 | 50 | nA | VEN/UVLO = 0V, TA = +25°C | 3 |
| INTVCC Output Voltage Range | VINTVCC | 4.75 | 5 | 5.25 | V | 1mA ≤ IINTVCC ≤ 25mA | 3 |
| INTVCC Current Limit | IINTVCC-MAX | 30 | mA | VINTVCC = 4.5V, VIN = 7.5V | 3 | ||
| INTVCC Dropout | VINTVCC-DO | 0.3 | V | VIN = 4.5V, IINTVCC = 10mA | 3 | ||
| INTVCC UVLO rising | VINTVCC_UVR | 4.05 | 4.2 | 4.3 | V | VINTVCC rising | 3 |
| INTVCC UVLO falling | VINTVCC_UVF | 3.65 | 3.8 | 3.9 | V | VINTVCC falling | 3 |
| EXTVCC Switchover Threshold rising | VEXTVCC | 4.56 | 4.7 | 4.84 | V | VEXTVCC rising | 3 |
| EXTVCC Switchover Threshold falling | VEXTVCC | 4.3 | 4.43 | 4.6 | V | VEXTVCC falling | 3 |
| High-Side nMOS On-Resistance | RDS-ONH | 60 | 115 | mΩ | ILX = 0.3A, sourcing | 3 | |
| Low-Side nMOS On-Resistance | RDS-ONL | 37 | 73 | mΩ | ILX = 0.3A, sinking | 3 | |
| LX Leakage Current | ILX_LKG | -2 | 3 | μA | VLX = (VPGND+1) V to (VIN -1) V, TA = +25°C | 3 | |
| Soft-Start Charging Current | ISS | 4.7 | 5 | 5.3 | μA | 3 | |
| FB Regulation Voltage (MAX17634C) | VFB-REG | 0.888 | 0.9 | 0.912 | V | MODE/SYNC = SGND or MODE/SYNC = INTVCC, for MAX17634C | 4 |
| FB Regulation Voltage (MAX17634C) | VFB-REG | 0.889 | 0.915 | 0.938 | V | MODE/SYNC = OPEN, for MAX17634C | 4 |
| FB Input Bias Current (MAX17634C) | IFB | -50 | 50 | nA | For MAX17634C, TA = +25°C | 4 | |
| MODE Threshold PWM | VM-PWM | 0.75 | V | MODE/SYNC = SGND (PWM mode) | 4 | ||
| SYNC Frequency Capture Range | FSYNC | 1.1 | 1.4 | x fSW | fSW set by RRT | 4 | |
| SYNC Pulse Width | 50 | ns | 4 | ||||
| SYNC Threshold VIH | VIH | 2.1 | V | 4 | |||
| SYNC Threshold VIL | VIL | 0.8 | V | 4 | |||
| Peak Current-Limit Threshold | IPEAK-LIMIT | 5.7 | 6.7 | 7.7 | A | 4 | |
| Runaway Current-Limit Threshold | IRUNAWAY-LIMIT | 6.7 | 7.8 | 9 | A | 4 | |
| Valley Current-Limit Threshold | IVALLEY-LIMIT | -0.28 | 0 | 0.28 | A | MODE/SYNC = OPEN or MODE/SYNC = INTVCC | 4 |
| Valley Current-Limit Threshold | IVALLEY-LIMIT | 2.5 | A | MODE/SYNC = SGND | 4 | ||
| Switching Frequency | fSW | 380 | 400 | 420 | kHz | RRT = 50.8kΩ | 5 |
| Switching Frequency | fSW | 475 | 500 | 525 | kHz | RRT = 40.2kΩ | 5 |
| Switching Frequency | fSW | 460 | 500 | 540 | kHz | RRT = OPEN | 5 |
| Switching Frequency | fSW | 1950 | 2200 | 2450 | kHz | RRT = 8.06kΩ | 5 |
| VFB Undervoltage Trip Level to Cause Hiccup (MAX17634C) | VFB-HICF | 0.55 | 0.58 | 0.605 | V | For MAX17634C | 5 |
| Minimum On-Time | tON-MIN | 52 | 80 | ns | 5 | ||
| Minimum Off-Time | tOFF-MIN | 140 | 160 | ns | 5 | ||
| RESET Output Level Low | VRESETL | 400 | mV | IRESET = 10mA | 5 | ||
| RESET Output Leakage Current | IRESETLKG | -100 | 100 | nA | TA = TJ = 25°C, VRESET = 5.5V | 5 | |
| FB Threshold for RESET Deassertion | VFB-OKR | 93.8 | 95 | 97.8 | % | VFB Rising, % of VFB-REG | 5 |
| FB Threshold for RESET Assertion | VFB-OKF | 90.5 | 92 | 94.6 | % | VFB Falling, % of VFB-REG | 5 |
| Input Quiescent Current, PFM Mode | IQ_PFM | 96 | μA | MODE/SYNC = OPEN, VEXTVCC = 5V | 3 | ||
| Input Quiescent Current, PFM Mode (RT = 40.2kΩ) | IQ_PFM | 106 | μA | RT = 40.2kΩ, MODE/SYNC = OPEN, VEXTVCC = 5V | 3 | ||
| Input Quiescent Current, PWM Mode | IQ_PWM | 11 | mA | Normal switching mode; VEXTVCC = 5V | 3 | ||
| PFM Current-Limit Threshold | IPFM | 1.6 | A | MODE/SYNC = OPEN | 3 | ||
| Thermal Shutdown Threshold | 165 | °C | Temperature rising | 5 | |||
| Junction to Ambient (θJA) | θJA | 26 | °C/W | Four-layer board, no airflow | 2 | ||
| Junction to Case (θJC) | θJC | 2 | °C/W | 2 |
CAD (KiCad official)
- Symbol:
MAX17634CATP+T - Footprint:
Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm - 3D model: TQFN-20(4x4) (KiCad packages3D, STEP)
- 3D model files:
max17634catp-t-etched.step/max17634catp-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);max17634catp-t.step/max17634catp-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices Inc Maxim Integrated datasheet (22 pp, sha256
77bf297752a23d9c, retrieved 2026-10-20, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).