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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

UCD3138ARGCT

Texas Instruments · Monitors & Reset Circuits · VQFN-64-EP(9x9)

UCD3138ARGCT from Texas Instruments, in a VQFN-64-EP(9x9). 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	AGND	power_in	Analog ground;
2	AD13	input	12-bit ADC channel 13, also connected to comparator E and the I-share DAC output.
3	AD12	input	12-bit ADC channel 12.
4	AD10	input	12-bit ADC channel 10.
5	AD07	input	12-bit ADC channel 7, connected to comparator F and to the reference DAC output for comparator G.
6	AD06	input	12-bit ADC channel 6, connected to comparator F and the DAC output.
7	AD04	input	12-bit ADC channel 4, connected to comparator D and the DAC output.
8	AD03	input	12-bit ADC channel 3, connected to comparators B and C to help simple OVP and UVP connections.
9	V33DIO	power_in	Digital I/O 3.3 V core supply; recommended range 3 V to 3.6 V.
10	DGND	power_in	Digital ground.
11	RESET	input	Device reset input, active low.
12	ADC_EXT_TRIG	input	ADC conversion external trigger input; alternate functions are TCAP, SYNC and PWM0, and the pin can be used as GPIO.
13	SCI_RX0	input	SCI receive 0; can be used as GPIO when the peripheral is not being used.
14	SCI_TX0	output	SCI transmit 0; can be used as GPIO when the peripheral is not being used.
15	PMBUS_CLK	bidirectional	PMBus clock, open drain; alternate function is SCI_TX0.
16	PMBUS_DATA	bidirectional	PMBus data, open drain; alternate function is SCI_RX0.
17	DPWM0A	output	DPWM 0A high-resolution output.
18	DPWM0B	output	DPWM 0B high-resolution output.
19	DPWM1A	output	DPWM 1A high-resolution output.
20	DPWM1B	output	DPWM 1B high-resolution output.
21	DPWM2A	output	DPWM 2A high-resolution output.
22	DPWM2B	output	DPWM 2B high-resolution output.
23	DPWM3A	output	DPWM 3A high-resolution output.
24	DPWM3B	output	DPWM 3B high-resolution output.
25	DGND	power_in	Digital ground.
26	SYNC	bidirectional	DPWM synchronize pin; alternate functions are TCAP, ADC_EXT_TRIG, PWM0 and DTC1.
27	PMBUS_ALERT	bidirectional	PMBus alert, open drain.
28	PMBUS_CTRL	bidirectional	PMBus control, open drain.
29	SCI_TX1	output	SCI transmit 1; alternate function is PMBUS_ALERT.
30	SCI_RX1	input	SCI receive 1; alternate function is PMBUS_CTRL.
31	PWM0	bidirectional	General-purpose PWM 0.
32	PWM1	bidirectional	General-purpose PWM 1.
33	DGND	power_in	Digital ground.
34	INT_EXT	input	External interrupt input.
35	FAULT0	input	External fault input 0.
36	FAULT1	input	External fault input 1.
37	TCK	input	JTAG TCK; alternate functions are TCAP, SYNC, PWM0 and DTC0.
38	TDO	output	JTAG TDO; alternate functions are SCI_TX0, PMBUS_ALERT, FAULT0 and DTC1.
39	TDI	input	JTAG TDI; alternate functions are SCI_RX0, PMBUS_CTRL, FAULT1 and DTC0.
40	TMS	input	JTAG TMS.
41	TCAP	input	Timer capture input.
42	FAULT2	input	External fault input 2.
43	FAULT3	input	External fault input 3.
44	DGND	power_in	Digital ground.
45	V33DIO	power_in	Digital I/O 3.3 V core supply; recommended range 3 V to 3.6 V.
46	BP18	power_in	1.8 V digital power bypass; recommended range 1.6 V to 2 V with 1.8 V nominal.
47	V33D	power_in	Digital 3.3 V core supply; recommended range 3 V to 3.6 V.
48	AGND	power_in	Substrate analog ground.
49	AGND	power_in	Analog ground.
50	EAP0	input	Channel 0 differential analog voltage positive input for the EADC.
51	EAN0	input	Channel 0 differential analog voltage negative input for the EADC.
52	EAP1	input	Channel 1 differential analog voltage positive input for the EADC.
53	EAN1	input	Channel 1 differential analog voltage negative input for the EADC.
54	EAP2	input	Channel 2 differential analog voltage positive input; recommended for peak current mode control.
55	EAN2	input	Channel 2 differential analog voltage negative input.
56	AGND	power_in	Analog ground.
57	V33A	power_in	Analog 3.3 V supply; recommended range 3 V to 3.6 V.
58	AD00	input	12-bit ADC channel 0, connected to a current source used for PMBus address detection.
59	AD01	input	12-bit ADC channel 1, connected to a current source used for PMBus address detection.
60	AD02	input	12-bit ADC channel 2, connected to comparator A and used for current sharing.
61	AD05	input	12-bit ADC channel 5.
62	AD08	input	12-bit ADC channel 8.
63	AD09	input	12-bit ADC channel 9.
64	AD11	input	12-bit ADC channel 11.
65	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	VQFN-64-EP(9x9)
Category	Power Supply Chip
Pins	65

CAD (KiCad official)

Symbol: UCD3138ARGCT
Footprint: Package_DFN_QFN:QFN-64-1EP_9x9mm_P0.5mm_EP6x6mm
3D model: VQFN-64-EP(9x9) (KiCad packages3D, STEP)
3D model files: ucd3138argct-etched.step / ucd3138argct-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ucd3138argct.step / ucd3138argct.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (85 pp, sha256 d8c76afb06ae469a, retrieved 2026-10-11, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF