? semiconductor components industries, llc, 2002 may, 2002 rev. 0 1 publication order number: ncp1530/d ncp1530 product preview 600 ma pwm/pfm step-down converter with external synchronization pin the ncp1530 is a pwm/pfm nonsynchronous stepdown (buck) dc/dc converter for usage in systems supplied from 1cell liion, 2 and more cells alkaline/nicd/nimh batteries. it can operate in constantfrequency pwm mode or pwm/pfm mode in which the controller will automatically switches to pfm mode operation at low output loads for higher efficiency. the switching frequency can also be synchronized to external clock between 600 khz and 1200 khz. a maximum output current is up to 600 ma. applying an external synchronizing signal to syn pin can supersede the pwm operation. the ncp1530 consumes only 47 a (typ.) of supply current (v out = 3.0 v, no switching) and can be forced to shutdown mode by bringing the enable input (en) low. in shutdown mode, the regulator is disabled and the supply current is reduced to 0.5 a (max) while v out is internally pulled to ground with output capacitor discharged. other features include builtin undervoltage lockout, internal thermal shutdown, an externally programmable soft start time and output current limit protection. the ncp1530 operates from a maximum input voltage of 5.5 v and is available in a space saving, low profile micro8 package. features ? high conversion efficiency, up to 92% at v in = 4.0 v, v out = 3.3 v, i out = 500 ma ? currentmode pwm control ? automatic pwm/pfm mode for current saving at low output loads ? internal switching transistor support 600 ma output current (v in = 5.0 v, v out = 3.3 v) ? high switching frequency (600 khz) support small inductor and capacitor size ? synchronizable to external clock signal up to 1.2 mhz ? 100% duty cycle for maximum utilization of the supply source ? programmable softstart time through external chip capacitor ? output current limit protection ? builtin input undervoltage lockout ? power saving shutdown mode ? automatic output capacitor discharge while in shutdown mode ? space saving, low profile micro8 package typical applications ? pdas ? digital still camera ? cellular phone and radios ? portable test equipment ? portable scanners ? portable audio systems this document contains information on a product under development. on semiconductor reserves the right to change or discontinue this product without notice. micro8 dm suffix case 846a 1 8 pin connections http://onsemi.com a = assembly location l = wafer lot y = year w = work week marking diagram tbd alyw 8 7 6 5 1 2 3 4 vin syn ss gnd lx vref vout en (top view) see detailed ordering and shipping information in the package dimensions section on page 5 of this data sheet. ordering information
ncp1530 http://onsemi.com 2 figure 1. typical stepdown converter application vin syn ss gnd v in = 2.8 v to 5.5 v *c ss c in 22 f ncp1530 lx vout vref en d1 mbrm120et3 c out 22 f *c vref 1.0 f l1 10 h v out = 2.5 v *optional component figure 2. representative block diagram en detection tsd uvlo en sync detection and timing block syn mode selection master en mode drv control logic ov + mode + + master en ota + fb soft start ss gnd isen ilim vin vref vout lx fb
ncp1530 http://onsemi.com 3 pin function descriptions pin symbol description 1 vin unregulated supply input. 2 syn oscillator synchronization and mode selection input. sync = gnd (automatic pwm/pfm mode) the converter operates at 600 khz fixedfrequency pwm mode primarily, and automatically switches to variablefrequency pfm mode at small output loads for current saving. sync = vin (constantfrequency pwm mode) the converter operates at 600 khz fixedfrequency pwm mode always. sync = external clock signal between 600 to 1200 khz. the converter will be synchronized with the external clock signal. the sync pin is internally pulled to gnd. 3 ss softstart input. an external softstart capacitor is connected to this pin if extended softstart is required. a 50 na current will be sourced from this pin to charge up the capacitor during startup and gently ramps the device into service to prevent output voltage overshoot. builtin 200 s (typ.) softstart can be activated if the pin is floated. 4 gnd ground terminal. 5 en activehigh enable input. active to enable the device. bring this pin to gnd, output capacitor will be discharged to ground and the quiescent current is reduced to less than 0.5 a. this pin is internally pulled to vin. 6 vout feedback terminal. the output voltage is sensed by this pin and regulated. the output capacitor connected to this pin will be discharged by internal switch to ground when the converter is in shutdown mode. 7 vref connected to voltage reference decoupling capacitor. for noise nonsensitive applications, the internal voltage reference can operate without decoupling capacitor. 8 lx inductor terminal. this pin is connected to the drains of the internal pchannel switching transistors. the inductor must be connected between this pin and the output terminal. maximum ratings rating symbol value unit power supply (pin 1) v in 0.3 to 6 v input/output pins pins 24 & pins 78 v io 0.3 to 6 v thermal characteristics micro8 plastic package thermal resistance, junctiontoair r q ja 240 c/w operating junction temperature range t j 40 to +150 c operating ambient temperature range t a 40 to +85 c storage temperature range t stg 55 to +150 c 1. this device series contains esd protection and exceeds the following tests: human body model (hbm) 2.0 kv per jedec standard: jesd22a114. machine model (mm) 200 v per jedec standard: jesd22a115. 2. latchup current maximum rating: 150 ma per jedec standard: jesd78. 3. moisture sensitivity level (msl): 1 per ipc/jedec standard: jstd020a.
ncp1530 http://onsemi.com 4 electrical characteristics (v in = 1.2 x v r , t a = 25 c for typical value, 40 c t a 85 c for min/max values unless otherwise noted.) *v r is the factoryprogrammed output voltage setting. test circuit, refer to figure 1. characteristic symbol min typ max unit output voltage v out v r 1.5 % v input v oltage v in 1.1 v r 5.5 v maximum output current (v out = 3.0 v) i out (max) 600 ma supply current (v in = v r x 1.2, no load, v out = 3.0 v) i in 48 a shutdown supply current (no load, v en = 0 v) i shdn 0.1 6.0 a l x pin leakage current (no load, v en = 0 v) i lx 1.0 a l x pin on resistance (v in = v r x 1.2, i l = 150 ma) r dson(lx) 0.3 w oscillator frequency (sync pin pulled to gnd internally) f osc 600 khz maximum pwm duty cycle d maxpwm 100 % loading current for pfm to pwm (v in = v r x 1.2, v out = 3.0 v, l = 10 h, c out = 22 f) i pfmpwm 110 ma loading current for pwm to pfm (v in = v r x 1.2, v out = 3.0 v, l = 10 h, c out = 22 f) i pwmpfm 60 ma efficiency (v in = v r x 1.2, iload = 100 ma) h 92 % undervoltage lockout threshold v uvlo 1.8 2.0 v reference voltage (c vref = 1.0 f, t a = 25 c, v in = 3.5 v) v ref 1.173 1.18 1.187 v reference voltage temperature coefficient (c vref = 1.0 f, v in = 3.5 v) tc vref 0.03 mv/ c reference voltage load current (c vref = 1.0 f, v in = 3.5 v) (note 4) i vref 2.0 ma shutdown input logic high threshold voltage (v in = 3.5 v, v out = 0 v) v ih 1.75 v shutdown input logic low threshold voltage (v in = 3.5 v, v out = 0 v) v il 0.45 v pwm minimum ontime t pwmon 100 nsec pwm ov protection level %v ov 3.5 6.0 % pwm cyclebycycle current limit i lim 1.5 a builtin softstart time (v out = 3.0 v, ss pin floated) t ss 200 sec thermal shutdown threshold (v in = 3.5 v) th shd 145 c thermal shutdown hysteresis (v in = 3.5 v) th hsys 15 c 4. *loading capability decreases with v out .
ncp1530 http://onsemi.com 5 ordering information device output voltage frequency device marking package shipping ncp1530dm25r2 2.5 v tbd ncp1530dm27r2 2.7 v 600 khz tbd micro8 4000 units ncp1530dm30r2 3.0 v 600 khz tbd micro8 4000 units per 7 inch reel ncp1530dm33r2 3.3 v tbd
ncp1530 http://onsemi.com 6 package dimensions micro8 dm suffix case 846a02 issue e s b m 0.08 (0.003) a s t dim min max min max inches millimeters a 2.90 3.10 0.114 0.122 b 2.90 3.10 0.114 0.122 c --- 1.10 --- 0.043 d 0.25 0.40 0.010 0.016 g 0.65 bsc 0.026 bsc h 0.05 0.15 0.002 0.006 j 0.13 0.23 0.005 0.009 k 4.75 5.05 0.187 0.199 l 0.40 0.70 0.016 0.028 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 (0.006) per side. 4. dimension b does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 (0.010) per side. b a d k g pin 1 id 8 pl 0.038 (0.0015) t seating plane c h j l
ncp1530 http://onsemi.com 7 notes
ncp1530 http://onsemi.com 8 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and s pecifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provid ed in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into t he body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indem nify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized u se, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employ er. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. ncp1530/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada
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