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NON-ISOLATED DC/DC CONVERTERS
3.0 V-5.5 V Input 0.9 V-3.3 V/3 A Output
x7AH-03F1A0
* * * * Non-Isolated High Efficiency Fixed Frequency (300 kHz) Low Cost * * * * Remote On/Off Input Under Voltage Lockout OCP/SCP Wide Range Trim
Description
The Bel x7AH-03F1A0 module is a non-isolated, step down dc/dc converter that operates from 3.0 V to 5.5 V source. This converter is available in a range of output voltages from 0.9 V to 3.3 V. It is packaged in a compact, overmolded package rated at 3 A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. The efficiency of 3.3 V module is typically 92% at 5 V input at full load. Typical features include remote on/off, input under voltage lockout, over current protection and short circuit protection.
Part Selection
Output Voltage 0.9 V - 3.3 V Input Voltage 3.0 V - 5.5 V Max. Output Current 3A Max. Output Power 10 W Typical Efficiency 92% Part Number Surface Mount S7AH-03F1A0 Part Number Vertical Mount V7AH-03F1A0
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 -0.3 V -0.3 V -40 C -40 C Typ Max 6V 6V 85 C 125 C Notes
Input Specifications
Parameter Input Voltage VO=3.3 V VO=2.5 V VO=0.9 V-1.8 V Input Current (no load) Input Current (full load) VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V Vo=0.9 V Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (rms) 4.5 V 3.6 V 3.0 V 5 mA 75 mA 25 mA 5.5 V 5.5 V 5.5 V 70 mA 2.5 A 2.4 A 2.2 A 1.9 A 1.6 A 1.3 A 10 mA Tested with simulated source impedance of 500 nH, 5 Hz to 20 MHz and two 270 uF/16 V Oscon caps with ESR=0.018 ohm max at 100 kHz 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
3.0 V-5.5 V Input 0.9 V-3.3 V/3 A Output
Input Specifications (continued)
Parameter 2 I t Inrush Current Transient Turn on Voltage Threshold Turn off Voltage Threshold Min 2.2 V Typ 2 0.004 A s 2.4 V Max 2 0.008 A s 2.9 V Notes Only for 0.9 V-1.8 V output modules.
Note: All specifications are typical at nominal input (5 V), full load at 25 C unless otherwise stated.
Output Specifications
Parameter Output Voltage Set Point VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Line Regulation VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Load Regulation VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Regulation Over Temperature(-40 C to +85 C) VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (rms) VO=1.2 V-3.3 V VO=0.9 V Ripple and Noise (pk-pk) VO=1.2 V-3.3 V VO=0.9 V Turn on Time Overshoot at Turn on Output Capacitance Transient Response Overshoot 50% ~ 100% Max Load Settling Time All Overshoot 100% ~ 50% Max Load Settling Time 0A 5A 0 uF 17 mV 13 mV 9 mV 8mV 6 mV 5 mV 72 mV 54 mV 39 mV 32 mV 26 mV 19 mV 2 0.022 A s 15 mV 10 mV 50 mV 40 mV 7 mS 0% 150 mV 20 uS 150 mV 20 uS 33 mV 25 mV 18 mV 15 mV 12 mV 9 mV 97 mV 72 mV 52 mV 43 mV 40 mV 40 mV 3A 12 A 2 0.044 A s 25 mV 20 mV 70 mV 60 mV 12 mS 3% 1200 uF 200 mV 40 uS 200 mV 40 uS Test conditions: di/dt = 0.5 A/uS; Vin = 5V Test condition: 0-20 MHz BW 10 mV 8 mV 6 mV 5 mV 4 mV 3 mV 20 mV 16 mV 12 mV 10 mV 8 mV 6 mV Min 3.217 V 2.437 V 1.755 V 1.462 V 1.170 V 0.877 V Typ 3.3 V 2.5 V 1.8 V 1.5 V 1.2 V 0.9 V Max 3.383 V 2.563 V 1.845 V 1.538 V 1.230 V 0.923 V Notes Test conditions: Vin=5 V, Io=50% full load
Note: All specifications are typical at nominal input, full load at 25 C 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
3.0 V-5.5 V Input 0.9 V-3.3 V/3 A Output
General Specifications
Parameter Efficiency VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V Vo=0.9 V Switching Frequency Output Trim Range (wide trim) Output Trim Range (narrow trim) VO=1.2 V-3.3 V VO=0.9 V 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 88% 86% 83% 80% 77% 75% 250 kHz 90% Vo 92% 90% 87% 84% 81% 79% 300 kHz 7,800,000 hours 0.78 x 0.70 x 0.32 19.81 x 17.78 x 8.13 0.70 x 0.308 x 0.65 17.78 x 7.82 x 16.51 5g 360 kHz 403% Vo 110% Vo 110% Vo Calculated Per Bell Core TR-332 (Vin= 5 V; Vo=3.3 V; IO = 2.4 A; Ta = 25 C) Vo=0.9 V Measured at Vin=5 V, full load and Ta=25 C Min Typ Max Notes
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) Min -0.3 V 2.8 V Typ Max 0.8 V 6V Notes
Remote on/off pin open, unit on.
Output Trim Equations
Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vo) are shown below. 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- up =
3.712 -1 Vadj - Vo
Module
Trim Rtrim-up GND
Note: Output voltage Vo=0.902V when Ttrim-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
3.0 V-5.5 V Input 0.9 V-3.3 V/3 A Output
Efficiency Data
MODULE 3.3V 100.0% EFFICIENCY 95.0% 90.0% 85.0% 80.0% 75.0% 0.30 4.5V 5.0V 5.5V
0.75
1.50
2.25
3.00
OUTPUT CURRENT (A)
MODULE 1.8V 95.0% 90.0% EFFICIENCY 85.0% 80.0% 75.0% 70.0% 65.0% 0.30 0.75 1.50 2.25 3.00 OUTPUT CURRENT (A) 3.0V 3.3V 5.0V 5.5V
MODULE 0.9V 90.0% EFFICIENCY 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.30 0.75 1.50 2.25 3.00 OUTPUT CURRENT (A) 3.0V 3.3V 5.0V 5.5V
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
3.0 V-5.5 V Input 0.9 V-3.3 V/3 A Output
Thermal Derating Curve
x7AH-03F1A0
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
3.0 V-5.5 V Input 0.9 V-3.3 V/3 A Output
S7AH-03F1A0
bel
Pin Connections
Pin 1 2 3 4 5 6 7 Function Remote On/Off Vin Ground Vout Trim N/A N/A
V7AH-03F1A0
bel
bel
Pin Connections
Pin 1 2 3 4 5 Function Remote On/Off Vin Ground Vout Trim
2005 Bel Fuse Inc. Specifications subject to change without notice. 040605
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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