The JTMA8811 JTMA8812 integrates dual step-down, constant-on(3)

single point grounding. The best tie-point between the signal ground and the power ground is at the negative
side of the output capacitor on each channel, where there is less noise. Noisy traces beneath the IC are not
recommended. Below is a checklist for your layout:
Layout Consideration (Cont.)
Keep the switching nodes (UGATEx, LGATEx, BOOTx,and PHASEx) away from sensitive small signal nodes
(REF, ILIMx, and FBx) since these nodes are fast mov-ing signals. Therefore, keep traces to these nodes as
short as possible and there should be no other weak signal traces in parallel with theses traces on any layer.
The signals going through theses traces have both high dv/dt and high di/dt, with high peak charging and
discharging current. The traces from the gate driversto the MOSFETs (UGATEx and LGATEx) should be short
and wide.
Place the source of the high-side MOSFET and the drain of the low-side MOSFET as close as possible.

Minimizing the impedance with wide layout plane be-tween the two pads reduces the voltage bounce of

the node.
Decoupling capacitor, the resistor dividers, boot capacitors, and current-limit stetting resistor should
be close to their pins. (For example, place the decoupling ceramic capacitor near the drain of the
high-side MOSFET as close as possible. The bulk capacitors are also placednear the drain.)
The input capacitor should be near the drain of the upper MOSFET; the high quality ceramic decoupling
capacitor can be put close to the VCC and GND pins;
the output capacitor should be near the loads. The input capacitor GND should be close to the output ca-
pacitor GND and the lower MOSFET GND.
The drain of the MOSFETs (VIN and PHASEx nodes) should be a large plane for heat sinking. And PHASEx
pin traces are also the return path for UGATEx. Con-nect these pins to the respective converter’s upper
MOSFET source.
The controller used ripple mode control. Build the re-sistor divider close to the FB1 pin so that the high
impedance trace is shorter when the output voltage is in adjustable mode. And the FB1 pin traces can’t be
close to the switching signal traces (UGATEx, LGATEx,BOOTx, and PHASEx).
The PGND trace should be a separate trace, and in-dependently go to the source of the low-side MOSFETs
for current-limit accuracy.
八,相关产品

Part_No	Package & Pins	Topology	Architecture	Phase	No. of PWM Outputs	Output Current (max)(A)	Input Voltage (V)		Reference Voltage(V)	Bias Voltage (typ) (V)	Quiescent Current (typ)(uA)
Part_No	Package & Pins	Topology	Architecture	Phase	No. of PWM Outputs	Output Current (max)(A)	min	max	Reference Voltage(V)	Bias Voltage (typ) (V)	Quiescent Current (typ)(uA)
JTMA7068	SOP-14	Buck	VM	1	1	30	2.9	13.2	0.9	12	8000
	QSOP-16
	QFN4x4-16
JTMA7065	SOP-8	Buck	VM	1	1	20	2.9	13.2	0.8	12	5000
JTMA7065C	SOP-8	Buck	VM	1	1	20	2.9	13.2	0.8	12	5000
JTMA7098	QFN4x4-24	Multiphase	VM	2	1	60	3.1	13.2	0.6	12	5000
JTMA7120	SOP-8	Buck	VM	1	1	20	2.2	13.2	0.8	5月12日	2100
JTMA7120A	SOP-8	Buck	VM	1	1	20	2.2	13.2	0.8	5月12日	2100
JTMA7037/A/B	SOP-8	Buck	VM	1	1	5	5	13.2	1.25 / 0.8	5月12日	3000
JTMA7037/A/B	TSSOP-8	Buck	VM	1	1	5	5	13.2	1.25 / 0.8	5月12日	3000
JTMA7057	SOP-8	Buck	VM	1	1	10	3.3	5.5	0.8	5	2100
JTMA7062B	SOP-14	Buck	VM	1	1	10	5	13.2	0.8	12	2000
JTMA7066	TSSOP-24	Buck	VM	1	2	20	5	13.2	0.6	5月12日	4000
JTMA7066	QFN5x5-32	Buck	VM	1	2	20	5	13.2	0.6	5月12日	4000
JTMA7067N	SOP-14	Buck	VM	1	1	30	2.9	13.2	0.9	12	4000
	QSOP-16
	QFN-16
JTMA7073	SOP-14	Buck	VM	1	1	30	2.2	13.2	0.6	12	5000
JTMA7073A	SOP-14	Buck	VM	1	1	30	2.2	13.2	0.6	12	5000
JTMA7074	SOP-14	Buck	VM	1	1	25	2.2	13.2	0.8	12	5000
JTMA7095/A	LQFP7x7-48	Buck	VM	1	6	0.015	1.4	6.5	-	5	1800
	TQFN7x7-48	Boost
		Flyback
JTMA7116	TSSOP-24P	Buck	VM	1	2	20	2.97	5.5	0.8	5月12日	5000
JTMA7063	SOP-14	Buck	VM	1	1	10	5	13.2	0.8	12	3000
JTMA7064	SOP-8-P	Buck	VM	1	1	30	2.9	13.2	1.2	12	3000
JTMA7064	DIP-8	Buck	VM	1	1	30	2.9	13.2	1.2	12	3000
JTMA7108	SSOP-28	Buck	VM	1	2	20	5	24	0.9	5	1200
JTMA7108	QFN4x4-24	Buck	VM	1	2	20	5	24	0.9	5	1200
JTMA7158	SOP-20	Buck	VM	1	2	20	2.2	13.2	0.6	5月12日	4000
JTMA7181	SOP-8		VM	1	2	-	-	-	-	5月12日	550
JTMA7181	DFN3x3-10		VM	1	2	-	-	-	-	5月12日	550
JTMA38HC/42/3/4/5A	DIP-8	Buck	VM	1	1	1	1.2	9	24	5	9 ~ 24
	SOP-8	Boost
		Flyback
		Forward
JTMA7138	SSOP-16	Buck	VM	1	1	25	3	25	0.6	5	1700
	QFN4x4-16
	TQFN3x3-16
JTMA7199	TDFN3x3-10	Buck	COT	1	1	25	3	25	0.5	5	350
JTMA8700	QFN4x4-24	Buck	CM	2	1	40	4.5	13.2	0.6	5月12日	4000
JTMA8720B	SOP8-P	Buck	VM	1	1	20	3	13.2	0.8	5月12日	2500
JTMA8720B	TDFN3x3-10	Buck	VM	1	1	20	3	13.2	0.8	5月12日	2500
JTMA8722A/B/C/D	SOP8-P	Buck	VM	1	1	25	3	13.2	0.6 /0.8	5月12日	1200
JTMA8723	TDFN3x3-10	Buck	VM	1	1	25	4	13.2	0.8	5月12日	2000
JTMA8724	TDFN3x3-10	Buck	COT	1	1	25	4.5	25	0.6	5月12日	80
JTMA8725/A	SOP-8P	Buck	VM	1	1	25	4.5	13.2	0.8	5月12日	16000
JTMA8726	TQFN3x3-10	Buck	VM	1	1	25	4.5	13.2	0.6	5月12日	2500
JTMA8727/L	TDFN3x3-10	Buck	COT	1	1	30	3	25	0.8	5月12日	2000
JTMA8728	TQFN3x3-16	Buck	COT	1	1	30	1.8	28	0.6	5	600
JTMA8732	QFN4x4-24	Buck	VM	2	1	50	4.5	13.2	0.6	5月12日	5000
JTMA8811	TQFN4x4-24	Buck	COT	1	2	15	6	25	2	N	550
JTMA8812	TQFN4x4-24	Buck	COT	1	2	15	6	25	2	N	550
JTMA8813/A	TQFN4x4-24	Buck	COT	1	2	20	3	28	0.75	5	800
JTMA8813/A	TQFN3x3-20	Buck	COT	1	2	20	3	28	0.75	5	800
JTMA8814	TQFN3x3-16	Buck	COT	1	1	20	1.8	28	0.75	5	400
JTMA8815	QFN3.5x3.5-14	Buck	COT	1	1	20	1.8	28	0.75	5	400
JTMA8815	TQFN3x3-16	Buck	COT	1	1	20	1.8	28	0.75	5	400
JTMA8816	TQFN3x3-16	Buck	COT	1	2	20	1.8	28	0.75	5	400
JTMA8819	QFN3x3-20	Buck	COT	1	2	20	3	28	1.8 /1.5 /0.5	5	740
JTMA8819	TQFN3x3-16	Buck	COT	1	2	20	3	28	1.8 /1.5 /0.5	5	740
JTMA8820	TQFN4x4-24	Buck	CM	1	2	15	5	28	0.5	N	3000
JTMA8820	QFN3x3-20	Buck	CM	1	2	15	5	28	0.5	N	3000
JTMA8821	TDFN3x3-10	Buck	COT	1	1	20	1.8	28	0.5	5	250
JTMA8822/C	TQFN3x3-20	Buck	COT	1	2	15	6	25	2	N	550
JTMA8823A/B	TQFN3x3-20	Buck	COT	1	2	15	5.5	25	0.6	N	50
JTMA8868	TQFN3x3-20	Buck	COT	1	2	20	3	28	0.75	5	180
JTMA7088	QFN4x4-24	Multiphase	VM	2	1	60	3.1	13.2	0.85	12	5000
JTMA7165A/B/C	SOP-8P	Buck	VM	1	1	20	2.9	13.2	0.8	12	16000
JTMA7159A	SOP-20	Buck	VM	2	2	30	10	13.2	1	12	5000
JTMA8828	TDFN3x3-10	Buck	COT	1	1	25	1.8	28	0.7	5	250
JTMA8728	TQFN 3x3 16	Buck	COT	1	1	30	1.8	28	0.6	5	600

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