Products Description

The H-Series Half-Brick Isolated Power Converter redefines miniaturization with its industry-smallest 61.0×57.9×12.7mm footprint, delivering 800W output at 94% peak efficiency. Engineered for space-critical applications, this DC-DC converter features 2250Vdc reinforced isolation and integrated protection circuits, making it the optimal solution for portable medical devices, IoT edge nodes, and drone avionics where every cubic millimeter counts.

World Record: 800W in 7.2cm³ volume • 16-40V wide input • -55°C to 105°C operation • 220g ultralight design

Products Specification

Model number	Input range Vdc	Output voltage Vdc	Output Current @Full Load A	Efficiency %	Ripple and noise mV p-p	Maximum capacitor load uF
LM28S5H400-NTMG	16-40	5.0	80	90.5	30	100000
LM28S12H800-NMMG	16-40	12	66.7	92	30	8000
LM28S28H800-NMMG	16-40	28	28.6	94	50	4000
LM28S24H800-NMMG	16-40	24	33.4	92	80	4000
LM28S48H600-NTMG	16-40	48	12.5	93	150	1000

Parameter	Min	Typical	Max	Unit	Conditions
Input voltage range	16	28	40	Vdc	All models
Isolation voltage	-	-	2250	Vdc	Input-output/case
Switching frequency	-	330	-	kHz	Nominal input
Operating temperature	-55	-	105	°C	H.Ex. external temperature
MTBF	2	-	-	Mhrs	MIL-HDBK-217F
Weight	-	140	-	g	-

Design Details

Mechanical Dimensions:60.7(L) × 57.9(W) × 12.7(H) mm (industry-standard 1/2-brick)

product-600-364

Pin Configuration:

Pin	Designation	Function
1	Vin+	Positive input voltage
2	ON/OFF	Remote control terminal
3	Vin-	Negative input voltage
4	Vout-	Negative output voltage
A	I share	current-share bus
5	Sense-	Remote voltage sensing negative
6	Trim	Output voltage adjustment
7	Sense+	Remote voltage sensing positive
8	Vout+	Positive output voltage

Thermal Innovation: Aluminum alloy baseplate with 10°C/W thermal resistance (natural convection)

Mounting: Standard through-hole soldering with 1.5mm pin diameter

Products features

Ultra-Miniaturized

800W power in 60.7×25.7×12.7mm (1/2-brick) footprint

Intelligent Protection

Input undervoltage lockout (13.0V cutoff), output short-circuit auto-recovery

Precision Control

±1% voltage regulation from -55°C to 105°C

Wide Logic Compatibility

ON/OFF pin supports 2.4V-25V control signals

Remote Management

Sense+/- pins enable ±2% load regulation at 1m distance

Thermal Resilience

Operates at 105°C baseplate temperature (derated)

Advantages

Passed 1500Vdc isolation test per IEC 62368-1
94% efficiency verified at 28V/28.6A output (LM28S28PH800-NMMG)
ISO 7637-2 compliant automotive transients survival
500hr operation at 95% RH/60°C

500 thermal cycles (-55°C⇄125°C)

"0.1% output deviation during 50g vibration tests" - SGS Report