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NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input 0.8V-5.5V/8A Output
X7AH-08E Series
* * * * * Non-Isolated Fixed Frequency High Efficiency High Power Density Low Cost
PRELIMINARY
* * * * Remote On/Off Under-voltage Lockout (UVLO) OCP/SCP Wide Trim Range
Description
The Bel X7AH-08E1A0 modules are a series of non-isolated, step down DC/DC converters that operate from 4.5V to14V source. These converters are available in a range of output voltages from 0.8V to 5.5V. It is packaged in a compact, overmolded package rated at 8A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. The output is closely regulated and the efficiency for 5V output is typically 93% at full load.
Part Selection
Output Voltage 0.8V - 3.63V 4.5V - 5.5V Input Voltage 4.5V - 14V 8V - 14V Max. Output Current 8A 8A Max. Output Power 26.4W 44W Typical Efficiency 91% 93% Part Number Surface Mount S7AH-08E1A0 S7AH-08E500 Part Number Vertical Mount V7AH-08E1A0 V7AH-08E500
Note: Add "0" suffix at the end of the model number to indicate "Tube Packaging", and "R" for "Reel Packaging", and "G" for "Tray Packaging".
Absolute Maximum Ratings
Parameter Input Voltage (continuous) Output Enable Terminal Voltage Ambient Temperature Storage Temperature Min -0.3V -0.3V -40C -55C Typ Max 15V 14V 85C 125C Notes
Input Specifications
Parameter Input Voltage Vo=4.5V-5.5V Vo=0.9V-3.63V Input Current (full load) Vo=5.0V VO=3.3V VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Input Current (no load) Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (RMS) 3mA 180mA 50mA 5.4A 6.7A 5.3A 3.2A 3.0A 2.8A 2.0A 100mA 10mA 8.0V 4.5V 14V 14V Min Typ Max Notes
With simulated source impedance of 500nH, 5Hz to 20MHz; use two 47uF/16V low ESR Tantalum capacitors.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input 0.8V-5.5V/8A Output
Input Specifications (continued)
Parameter I2t Inrush Current Transient Turn-on Voltage Threshold Turn-off Voltage Threshold Min Typ 0.04A2s 4.3V 7.5V 4.0V 7.2V Max Notes X7AH-08E1A0 X7AH-08E500 X7AH-08E1A0 X7AH-08E500
Output Specifications
Parameter Output Voltage Set Point Vo=5.0V VO=3.3V VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Line Regulation Vo=5.0V VO=3.3V VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Load Regulation Vo=5.0V VO=3.3V VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Regulation Over Temperature (-40C to 85C) Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (RMS) Ripple and Noise (pk-pk) Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load 100% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time 120mV 50uS 120mV 50uS 180mV 80uS 180mV 80uS di/dt = 0.5A/uS; Vin = 12V; with a 1uF ceramic capacitor and a 10uF/10V Tantalum capacitor at the output. 0A 10A 0uF Min 4.900V 3.234V 2.450V 1.764V 1.470V 1.176V 0.882V Typ 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V 0.9V 15mV 10mV 8mV 5mV 5mV 4mV 4mV 15mV 10mV 8mV 5mV 5mV 4mV 4mV 30mV TBD 15mV 50mV 8mS 0% Max 5.100V 3.366V 2.550V 1.836V 1.530V 1.224V 0.918V 25mV 16.5mV 12.6mV 9mV 9mV 8mV 8mV 25mV 16.5mV 12.5mV 9mV 9mV 8mV 8mV 50mV 8A 20A 30mV 80mV 20mS 3% 3200uF BW = 0-20MHz; with a 1uf ceramic capacitor and a 10uF/10V Tantalum capacitor at the output. Notes
Test condition: Vin=12V, lout=50% full load
All
Note: All specifications are typical at 12V input, full load at 25C unless otherwise stated.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input 0.8V-5.5V/8A Output
General Specifications
Parameter Efficiency Vo=5.0V VO=3.3V VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Switching Frequency Output Trim Range Remote Sense Compensation MTBF Dimensions (surface mount) Inches (L x W x H) Millimeters (L x W x H) Dimensions (vertical) Inches (L x W x H) Millimeters (L x W x H) Weight 89% 87% 86% 84% 82% 81% 76% 90%VO 90%VO 93% 91% 90% 88% 86% 85% 80% 330KHz TBD 0.78 x 0.7 x 0.32 19.81 x 17.78 x 8.13 0.7 x 0.308 x 0.65 17.78 x 7.82 x 16.51 6g 403%VO 110%VO 0.2V Calculated Per Bell Core TR-332 (IO = Nominal; Ta = 25C) X7AH-08E1A01 X7AH-08E5002 Min Typ Max Notes
Measured at Vin=12V, full load
Notes: All specifications are typical at 25C unless otherwise stated. 1. The output voltage is 0.9V at trim pin is open. 2. The output voltage is 5.0V at trim pin is open.
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) -0.3V 2.4V 0.8V 14V Remote on/off pin open, unit on. Min Typ Max Notes
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input 0.8V-5.5V/8A Output
Output Trim Equations
1) X7AH-08E1A0 Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the resistors should be used for any given application.
Vout
Rtrim - down
1.076 = - 5.631 Vo - Vadj
Rtrim-down Module Trim
GND
Rtrim-up
3.759 = - 0.261 Vadj - Vo
Vout Module Trim Rtrim-up GND
Note: Output voltage Vo=0.9V when Rtrim_up is not connected.
2) X7AH-08E500 Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the resistors should be used for any given application.
Vout
Rtrim- down =
23.099 - 5.631 Vo - Vadj
Rtrim-down Module Trim
GND
Vout
Rtrim-up
3.759 = - 0.261 Vadj - Vo
Module
Trim Rtrim-up GND
Note: Output voltage Vo=5V when Rtrim_up is not connected.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input 0.8V-5.5V/8A Output
Efficiency Data
MODULE 3.3V 100.0% 95.0% 90.0% 85.0% 80.0% 75.0% 0.8 2 4 6 8 OUTPUT CURRENT(A)
105.0%
MODULE 2.5V
EFFICIENCY
4.5V 8.0V 12.0V 14.0V
EFFICIENCY
95.0% 85.0% 75.0% 65.0% 0.8 2 4 6 8 OUTPUT CURRENT(A)
4.5V 8.0V 12.0V 14.0V
MODULE 1.8V 105.0%
MODULE 1.5V 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 0.8 2 4 6 8 OUTPUT CURRENT(A)
EFFICIENCY
EFFICIENCY
95.0% 85.0% 75.0% 65.0% 0.8 2 4 6 8 OUTPUT CURRENT(A)
4.5V 8.0V 12.0V 14.0V
4.5V 8.0V 12.0V 14.0V
MODULE 1.2V 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 0.8 2 4 6 8 OUTPUT CURRENT(A)
100.0%
MODULE 0.9V
EFFICIENCY
4.5V 8.0V 12.0V 14.0V
EFFICIENCY
90.0% 80.0% 70.0% 60.0% 0.8 2 4 6 8 OUTPUT CURRENT(A)
4.5V 8.0V 12.0V 14.0V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input 0.8V-5.5V/8A Output
Thermal Derating Curves
Vo=0.9V
Vo=1.8V
Vo=3.3V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5V-14V Input 0.8V-5.5V/8A Output
S7AH-08E
bel
Pin Connections
Pin 1 2 3 4 5 6 7 Function Remote On/Off (option) Vin Ground Vout Trim (option) Remote Sense (option) N/A
V7AH-08E
Pin Connections
bel
Pin
Function Remote On/Off (option) Vin Ground Vout Trim (option)
bel
1 2 3 4 5
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 030405
CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
FAR EAST Bel Fuse Ltd. 8F/ 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com
EUROPE Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com

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