SC4524DSETRT Semtech, SC4524DSETRT Datasheet
SC4524DSETRT
Specifications of SC4524DSETRT
Related parts for SC4524DSETRT
SC4524DSETRT Summary of contents
Page 1
POWER MANAGEMENT Features Wide input range 18V 2A Output Current 200kHz to 2MHz Programmable Frequency Precision 1V Feedback Voltage Peak Current-Mode Control Cycle-by-Cycle Current Limiting Hiccup Overload Protection with Frequency Foldback ...
Page 2
... GND Pin SOIC - EDP) Marking Information yyww=Date code (Example: 0752) xxxxx=Semtech Lot No. (Example: E9010) Ordering Information Device SC4524DSETRT BST SC4524DEVB FB Notes: COMP (1) Available in tape and reel only. A reel contains 2,500 devices. (2) Available in lead-free package only. Device is fully WEEE and RoHS SS/EN compliant and halogen-free ...
Page 3
Absolute Maximum Ratings V Supply Voltage ……………………………… -0.3 to 24V IN BST Voltage ……………………………………………… 40V BST Voltage above SW …………………………………… 36V SS Voltage ……………………………………………-0 Voltage …………………………………………… -0 Voltage ………………………………………… -0 Transient ...
Page 4
Electrical Characteristics (Cont.) Unless otherwise noted 12V 15V BST Parameter Minimum Switch On-time Minimum Switch Off-time Switch Leakage Current Minimum Bootstrap Voltage BST Pin Current Oscillator Switching Frequency Foldback Frequency Soft Start and Overload ...
Page 5
Pin Descriptions SO-8 Pin Name Pin Function Emitter of the internal NPN power transistor. Connect this pin to the inductor, the freewheeling diode and the 1 SW bootstrap capacitor. Power supply to the regulator also the collector of ...
Page 6
Block Diagram COMP FREQUENCY FOLDBACK ROSC SS/ REFERENCE & THERMAL SHUTDOWN 2.4 A SS/EN ...
Page 7
Typical Characteristics SC4524A/B Efficiency =3. =2. =1. 1MHz, V =12V Curve =20BQ030 0.5 1 ...
Page 8
Curve 11 Typical Characteristics (Cont.) SS270 REV 6-7 V Thresholds vs Temperature IN 3.0 2.9 Start 2.8 2.7 2.6 Curve 14 UVLO 2.5 2.4 -50 - 100 125 o Temperature ( C) SS270 REV 6-7 V ...
Page 9
Applications Information Operation The SC4524D is a constant-frequency, peak current- mode, step-down switching regulator with an integrated 18V, 2.6A power NPN transistor. Programmable switching frequency makes the regulator design more flexible. With the peak current-mode control, the double reactive poles ...
Page 10
Applications Information (Cont.) becomes armed. As the load draws more current from the regulator, the current-limit comparator ILIM (Figure 2) will eventually limit the switch current on a cycle-by- cycle basis. The over-current signal OC goes high, setting the latch ...
Page 11
Applications Information (Cont.) Closed-loop measurement shows that the SC4524D minimum on time is about 120ns at room temperature (Figure 4). If the required switch on time is shorter than the minimum on time, the regulator will either skip cycles or ...
Page 12
Applications Information (Cont.) inductor current of a buck converter directly feeds C resulting in very low ripple current. Avoid using Z5U and Y5V ceramic capacitors for output filtering because these types of capacitors have high temperature and high voltage coefficients. ...
Page 13
Applications Information (Cont BST V V − − − − ...
Page 14
Applications Information (Cont.) integrator pole (-90deg) and the dominant pole (-90deg). The high frequency pole nulls the ESR zero and attenuates high frequency noise Fz1 Fz1 -30 -30 -60 -60 ...
Page 15
NPN transistor (see Table 4). Table 4. Typical switching time Load Current Input Voltage 1A 12V 12.5ns + + addition, the quiescent current loss is BST BST ...
Page 16
Recommended Component Parameters in Typical Applications Table 5 lists the recommended inductance (L voltages. The inductance is determined by assuming that the ripple current is 35% of load current I parameters are calculated by assuming a 22mF low ESR ceramic ...
Page 17
Typical Application Schematics 4 10nF Figure 10. 1MHz 5V to 3.3V/2A Step-down Converter 4 10nF Figure 11. 500kHz 10V-16V to 1.5V/2A Step-down Converter BST IN SW SC4524D SS/EN FB ...
Page 18
Typical Performance Characteristics (For A 12V to 5V/2A Step-down Converter with 1MHz Switching Frequency) SS270 REV 6-7 Load Characteristic 0.5 1 1.5 Load Current (A) Figure 12(a). Load Characteristic 5V Output Response ...
Page 19
Outline Drawing - SOIC-8 EDP 2X E/2 ccc C 2X N/2 TIPS aaa C SEATING PLANE C EXPOSED PAD NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND 3. DIMENSIONS "E1" AND "D" DO NOT ...
Page 20
Land Pattern - SOIC-8 EDP (C) F THERMAL VIA P Ø 0.36mm NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. ...
Page 21
... PLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, em- ployees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. ...