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NON-ISOLATED DC/DC CONVERTERS
3.3V Input 0.9V-2.5V/3A Output
x7AH-03C1A0 Series
* * * * * Non-Isolated High Efficiency Low Cost Excellent Thermal Performance Input Under Voltage Lockout * * * * OCP/SCP Wide Range Trim Remote On/Off Industrial Temperature Range
Description
The Bel x7AH-03C1A0 modules are a series of non-isolated, step down DC/DC converters that operate from a nominal 3.3V source. These converters are available in a range of output voltages from 0.9V to 2.5V. It is packaged in a compact, overmolded package rated at 3A. 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 2.5V output is typically 93% at full load. Typical features include remote on/off, input under voltage lockout, over current protection and short circuit protection.
Part Selection
Output Voltage 0.9-2.5V 2.5V 1.8V 1.5V 1.2V 0.9 V Input Voltage 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V Max. Output Current 3A 3A 3A 3A 3A 3A Max. Output Power 7.5W 7.5W 5.4W 4.5W 3.6W 2.7W Typical Efficiency 93% 93% 89% 87% 84% 81% Part Number Surface Mount S7AH-03C1A0 S7AH-03C250 S7AH-03C180 S7AH-03C150 S7AH-03C120 S7AH-03C090 Part Number Vertical Mount V7AH-03C1A0 V7AH-03C250 V7AH-03C180 V7AH-03C150 V7AH-03C120 V7AH-03C090
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 6V 6V 85C 125C Notes
Input Specifications
Parameter Input Voltage Input Current (no load) Input Current (full load) VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Remote Off Input Current 7mA 3.1A 2.3A 1.9A 1.6A 1.2A 14mA Min 3V Typ Max 3.6V 110mA 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
3.3V Input 0.9V-2.5V/3A Output
Input Specifications (continued)
Parameter Input Reflected Ripple Current (pk-pk) Min Typ 50mA Max 100mA Notes With simulated source impedance of 500nH, 5Hz to 20MHz; use a 270uF/6.3V capacitor with ESR=0.03 ohm max, at 100KHz.
Input Reflected Ripple Current (RMS) I t Inrush Current Transient Turn on Voltage Threshold Turn off Voltage Threshold
2
-
15mA 0.01A s 2.7V 2.4V
2
25mA 0.02A s 2
Note: All specifications are typical at 25C unless otherwise stated.
Output Specifications
Parameter Output Voltage Set Point VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Line Regulation VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Load Regulation VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Regulation Over Temperature (-40C to +85C) VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Output Current Current Limit Threshold Short Circuit Surge Transient VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V 1mV 1mV 1mV 1mV 1mV 5mV 5mV 5mV 5mV 5mV 1mV 1mV 1mV 1mV 1mV 5mV 5mV 5mV 5mV 5mV 2.450V 1.764V 1.470V 1.176V 0.882V 2.5V 1.8V 1.5V 1.2V 0.9V 2.550V 1.836V 1.530V 1.224V 0.918V Test conditions: Vin=3.3V, Io= full load Min Typ Max Notes
0A 5A
10mV 10mV 10mV 10mV 10mV 0.04A s 2 0.04A s 0.04A2s 2 0.04A s 2 0.04A s
2
20mV 20mV 20mV 20mV 20mV 3A 9A 0.08A s 2 0.08A s 0.08A2s 2 0.08A s 2 0.08A s
2
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
3.3V Input 0.9V-2.5V/3A Output
Output Specifications (continued)
Parameter Ripple and Noise (RMS) VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Ripple and Noise (pk-pk) VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time VO=0.9V VO=1.2V VO=1.5V VO=1.8V VO=2.5V 100mV 30uS 100mV 30uS 100mV 30uS 100mV 30uS 90mV 30uS 90mV 30uS 90mV 30uS 90mV 30uS 90mV 30uS 90mV 30uS 130mV 60uS 130mV 60uS 130mV 60uS 130mV 60uS 120mV 60uS 120mV 60uS 120mV 60uS 120mV 60uS 120mV 60uS 120mV 60uS Test conditions: di/dt=0.5A/us, Vin=3.3V, without any external capacitor at the output. 0uF 45mV 45mV 45mV 45mV 45mV 7mS 0% 70mV 70mV 70mV 70mV 70mV 15mS 1% 1200uF 10mV 10mV 10mV 10mV 10mV 20mV 20mV 20mV 20mV 20mV Min Typ Max Notes
Test conditions: 0-20MHz BW; 0.1uF ceramic capacitor and 10uF tantalum capacitor at the output.
Note: All specifications are typical at nominal 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
3.3V Input 0.9V-2.5V/3A Output
General Specifications
Parameter Efficiency VO=2.5V VO=1.8V VO=1.5V VO=1.2V VO=0.9V Switching Frequency Output Trim Range (wide trim) Output Trim Range (narrow trim) Vo=1.2V-2.5V Vo=0.9V 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 90% 86% 84% 81% 78% 250KHz 0 90%Vo 93% 89% 87% 84% 81% 300KHz 3,131,719 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 340KHz 292%VO 110%Vo 110%Vo Calculated Per Bell Core TR-332 (IO = Nominal; Ta = 25C) Vo=0.9V Measured at Vin=3.3V, full load and Ta=25C Min Typ Max Notes
Note: All specifications are typical at 25C unless otherwise stated.
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) -0.3V 1.8V 0.3V 3.6V Min Typ Max Notes
Remote on/off pin open, unit on.
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
3.3V Input 0.9V-2.5V/3A Output
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 (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.
Rtrimdown
A = -B Vnom - Vadj
Vout Rtrimdown Module Trim GND
C Rtrimup = -D Vadj - Vnom
Vout Module Trim Rtrimup GND
Vnom 0.9 - 2.5 2.5 1.8 1.5 1.2 0.9
A N/A 7.9117 4.6538 3.2633 1.8699 N/A
B N/A 16.14 20.84 16.14 11.45 N/A
C 3.712 3.712 3.712 3.712 3.712 3.712
D 1.54 11.5 16.2 11.5 6.81 33.2
Notes Vo=0.9V when Rtrim is open Vo=2.505V when Rtrim is open Vo=1.803V when Rtrim is open Vo=1.503V when Rtrim is open Vo=1.203V when Rtrim is open Vo=0.903V when Rtrim is open
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
3.3V Input 0.9V-2.5V/3A Output
Efficiency Data
MODULE 2.5V EFFICIENCY
EFFICIENCY
MODULE 1.8V 100% 90% 80% 70% 60% 0.3 0.75 1.5 2.25 3 3.0V 3.3V 3.6V
100% 90% 80% 70% 60% 0.3 0.75 1.5 2.25 OUTPUT CURRENT 3 3.0V 3.3V 3.6V
OUTPUT CURRENT
MODULE 1.5V 100% 90% 80% 70% 60% 50% 0.3 0.75 1.5 2.25 3 OUTPUT CURRETN
MODULE 1.2V 100% 90% 80% 70% 60% 50% 0.3 0.75 1.5 2.25 3 OUTPUT CURRENT EFFICIENCY
EFFICIENCY
3.0V 3.3V 3.6V
3.0V 3.3V 3.6V
MODULE 0.9V EFFICIENCY 100% 80% 60% 40% 0.3 0.75 1.5 2.25 3 OUTPUT CURRENT 3.0V 3.3V 3.6V
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
3.3V Input 0.9V-2.5V/3A Output
Thermal Derating Curve
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
3.3V Input 0.9V-2.5V/3A Output
S7AH-03C1A0
bel
Pin Connections
Pin 1 2 3 4 5 6 7 Function Remote On/Off (option) Vin Ground Vout Trim (option) N/A N/A
V7AH-03C1A0
bel
bel
Pin Connections
Pin Function Remote On/Off (option) Vin Ground Vout Trim (option)
bel
1 2 3 4 5
2005 Bel Fuse Inc. Specifications subject to change without notice. 011705
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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