HT2596S-ADJ

HT2596 3.0 A, Step-Down Switching Regulator Description HT2596, HT2596-3.3, HT2596-5.0, HT2596-12 - are monolithic ICs of a step-down DC-DC con- verters. The principle of operation of ICs is based on control of build-in power NPN tran- sistor, quantity of energy transferred to load is regulated by means of pulse-width modula- tion. So ouput voltage practically do not depends from load. ICs are purposed for applica- tion inside power supply units of consumer & industrial devices. Family consist of: - HT2596 - PWM voltage regulator with adjustable output voltage; - HT2596-3.3 - PWM voltage regulator with fixed output voltage 3,3V; - HT2596-5.0 - PWM voltage regulator with fixed output voltage 5,0V; - HT2596-12 - PWM voltage regulator with fixed output voltage 12,0V; Features: -Output voltage: 3.3V, 5V, 12V and adjustable output version; - Adjustable version output voltage range, 1.23V to 37V+4%; - Oscilator with build-in capacity for 150Khz switching frequency; - PWM contro circuit of output voltage; - Overheating and current-limit protection ; - Switch on/off control circuit; - Up to 40V operating voltage - Output load current: 3A - Standby mode with low power consumption - Built-in switching transistor on chip IC realized in 5-pin plastic package TO220AB/5 and TO263. TO-220B-5L HT2596Q TO-220-5L HT2596T TO-263-5L HT2596S 1 5 WSOP24 HT2596M 24 1 Rev. 00 HT2596 Pin Description Table Pin number Symbol 01 02 03 04 05 VIN Output GND FB SD Purpose description Input (operating voltage) Output Common pin Feedback control pin Switching on/off pin Connection Diagrams (XX indicates output voltage option.) HT2596Q HT2596T HT2596Q HT2596S HT2596M *No Internal Connection Rev. 00 HT2596 Block diagramm SD 05 Reference Current Source Reference voltage 1,235 V Regulator 2,5 V 01 VIN GB1 GB2 Start up unit R3 A3 + - A4 + + R1 - FB R2 A1 Frequency compensation - A2 VT1 Driver + VT2 2 Oscilator 150 kHz Overheating protection unit 3 Output GND A1 - amplifier; A2 – A4 – comparators; GB1 – battery 200 mV; GB2 – battery 220 mV; R1 - R3 –resistors; VT1, VT2 - transistors Rev. 00 HT2596 Recommended mode and Absolute Maximum Ratings Recommended Parameter, unit Symbol mode min max V IN Input (operating) voltage, V 4,5 40 VOUT Output voltage relative to GND, V VSD CD pin input voltage, V V FB Feedback control voltage, V Storage temperature, oC Junction temperature, oC Thermal resistance junction-case, o C/W Thermal resistance junction-ambient, o C/W Thermal resistance junction-ambient (with heat sink), oC/W Absolute Maximum Ratings min max 45 -1,0 -0,3 25 -0,3 25 Tstg Tj Rth j-c -40* - 125 2,5*** -60 -40* - 150 150 2,5*** Rth j-a - 65** - 65** Rth j-a - 28** - 28** * Ambient temperature is indicated ** Rth j-a – Thermal resistance junction-ambient (for IC without additional heat sink is equal 65 o C/W, for IC with copper radiator 19 sm2 the value of parameter is estimated as 28 oC/W). Thermal resistance junction-ambient Rth j-a , oC/W for ICs with additional heat sink is calculated by formula: Rth j-a = Rth j-c + Rth c-a , (1) ***Rth jc - thermal resistance junction case, oC /W. (the value of parameter is estimated as 2,5 o C/W); Rth c-a - thermal resistance case ambient Heat sink, application mode (power consumption) and ambient temperature have to provide junction temperature Tj  125 C. Maximum dissipation power, Ptot, W, is calculated by formula Ptot = (125 – TA)  Rth j-a , (2) 125 – maximum permissible junction temperature , oC TA – ambient temperature, C; Rth(j-a) – thermal resistance junction-ambient, oC/W. Rev. 00 HT2596 Electric parameters IC Parameter, unit HT2596 Feedback bias current , nA Oscilator frequency, kHz Symbol Test condition min - max 60 100 173 173 1,4 1,5 o Current limit, A ICL 3,6 3,6 5,5 6,5 Output leakage current, mA IL(0) - -0,2 IL(-1) - -60 IQ - 10 ISTBY - 250 300 - 0,6 2,0 - - 25 VFB = 1,3 V; VIN = 12 V VIN = 12 V VIN = 40 V VFB = 0 V; VIN = 12 V; IOUT = -3 A no external circuit VFB = 0 V; VIN = 12 V; -3 A  IOUT  -7 A no external circuit VFB = 12 V; VIN = 40 V; VOUT = 0 V no external circuit VFB = 12 V; VIN = 40 V; VOUT = -1 V VFB = 12 V; VIN = 12 V VFB = 0 V; VIN = 40 V; VSD = 5 V VIN = 12 V; VSD from 2,5 to 0,5V VFB = 0 V; VIN = 12 V; VSD from 0,5 to 2,5 V VIN = 12 V; VSD = 2,5 V - 5,0 VIN = 12 V; VSD = 0,5 V 1,193 1,18 1,267 1,28 Saturation voltage V Quiescent current, mA Standby mode Quiescent current, uA SD pin low level input voltage (switching on), V SD pin high level input voltage (switching off), V SD pin high level input current (switching off), uA SD pin low level input current (switching on), uA Feedback voltage, V IB fOSC VSAT VIL 127 110 - VIH IH IL VFB TA, 4,5 В VIN  40 V; -0,2  IOUT  -3 A; VOUT programmed on 3 V C 2510 125* -40 2510 2510 125* -40 2510 2510 125* -40 Rev. 00 HT2596 Electric parameters (continued) IC Parameter, unit HT259633 Symb ol Oscilator frequency, kHz fOSC Saturation voltage V VSAT Test condition min 127 110 - max 173 173 1,4 1,5 o VIN = 12 V VIN = 40 V VFB = 0 V; VIN = 12 V; IOUT = -3 A no external circuit VFB = 0 V; VIN = 12 V; -3 A  IOUT  -7 A no external circuit VFB = 12 V; VIN = 40 V; VOUT = 0 V no external circuit VFB = 12 V; VIN = 40 V; VOUT = -1 V VFB = 12 V; VIN = 12 V VIN = 40 V; VSD = 5 V Current limit, A ICL 3,6 3,6 5,5 6,5 Output leakage current, mA IL(0) - -0,2 IL(-1) - -60 Quiescent current, mA IQ - 10 Standby mode Quiescent current, uA ISTBY - 250 300 - 0,6 2,0 - - 25 VIN = 12 V; VSD =2,5 V VIN = 12 V; VSD = 0,5 V VIN = 12 V; VSD = 2,5 V - 5,0 VIN = 12 V; VSD = 0,5 V VIL SD pin low level input voltage (switching on), V VIH SD pin high level input voltage (switching off), V IIH SD pin high level input current (switching off), uA IIL SD pin low level input current (switching on), uA VOUT Output voltage, V 3,168 3,432 3,135 3,465 TA, 4,75 V VIN  40 V; -0,2  IOUT  -3 A; C 2510 125* -40 2510 2510 125* -40 2510 2510 125* -40 Rev. 00 HT2596 Electric parameters (continued) IC Parameter, unit HT259650 Symbol Oscilator frequency, kHz fOSC Saturation voltage V VSAT Test condition min 127 110 - max 173 173 1,4 1,5 o Current limit, A ICL 3,6 3,6 5,5 6,5 Output leakage current, mA IL(0) - -0,2 IL(-1) - -60 IQ - 10 Standby mode Quiescent current, uA SD pin low level input voltage (switching on), V ISTBY - 250 300 - 0,6 SD pin high level input voltage (switching off), V VIH 2,0 - SD pin high level input current (switching off), uA SD pin low level input current (switching on), uA Output voltage, V IH - 25 VIN = 12 V VIN = 40 V VFB = 0 V; VIN = 12 V; IOUT = -3 A no external circuit VFB = 0 V; VIN = 12 V; -3 A  IOUT  -7 A no external circuit VFB = 12 V; VIN = 40 V; VOUT = 0 V no external circuit VFB = 12 V; VIN = 40 V; VOUT = -1 V VFB = 12 V; VIN = 12 V VFB = 0 V; VIN = 40 V; VSD = 5 V VFB = 0 V; VIN = 12 V; VSD from 2,5 to 0,5 V VIN = 12 V; VSD from 0,5 to 2,5 V VIN = 12 V; VSD = 2,5 V - 5,0 VIN = 12 V; VSD = 0,5 V 4,8 4,75 5,2 5,25 7,0 V VIN  40 V; -0,2  IOUT  -3 A Quiescent current, mA VIL IL VOUT TA, C 2510 125* -40 2510 2510 125* -40 2510 2510 125* -40 Rev. 00 HT2596 Electric parameters (continued) IC HT259612 Parameter, unit Symbol Oscilator frequency, kHz fOSC Saturation voltage V VSAT Test condition min 127 110 - max 173 173 1,4 1,5 o VIN = 24 V VIN = 40 V VFB = 0 V; VIN = 24 V; IOUT = -3 A no external circuit VFB = 0 V; VIN = 24 V; -3 A  IOUT  -7 A no external circuit VFB = 15 V; VIN = 40 V; VOUT = 0 V no external circuit VFB = 15 V; VIN = 40 V; VOUT = -1 V VFB = 15 V; VIN = 24 V VIN = 40 V; VSD = 5 V Current limit, A ICL 3,6 3,6 5,5 6,5 Output leakage current, mA IL(0) - 0,2 IL(-1) - 60 IQ - 10 Standby mode Quiescent current, uA SD pin low level input voltage (switching on), V ISTBY - 250 300 0,6 - SD pin high level input voltage (switching off), V VIH - 2,0 SD pin high level input current (switching off), uA SD pin low level input current (switching on), uA Output voltage, V IH - 25 VIN = 24 V; VSD from 2,5 to 0,5 V VIN = 24 V; VSD from 0,5 to 2,5 V VIN = 24 V; VSD = 2,5 V 5,0 VIN = 24 V; VSD = 0,5 V Quiescent current, mA VIL IL VOUT 11,52 12,48 11,4 12,6 TA, 15 V VIN  40 V; -0,2  IOUT  -3 A C 2510 125* -40 2510 2510 125* -40 2510 2510 125* -40 * Junction temperature. Because of measurements of electric parameters are executed in pulse mode, junction temperature is equal to ambient. Rev. 00 HT2596 Typical Electric Parameters Parameter, unit Efficiency, % - HT2596 - HT2596-33 - HT2596-50 - HT2596-12 Max. Duty Cycle(ON), % Max. Duty Cycle(OFF),% Overheating protection operation threshold, C Symbol  Typ. 73 73 80 90 100 0 160* DCmax DCmin Th Test condition VIN = 12 V; IOUT = 3 А Note 1 VIN = 15 V; IOUT = -3 A VFB = 0 V VFB = 12 V 2 3 Application diagramm FB from 4,5 to 40 V VIN L1 Output 01 HT2596 3A 02 VD1 + C1 05 SD C1, C2 – electrolytic capacitors L1 – inductor; VD1 – diode + 03 GND C2 HT2596 TO-220SD-5L (Bent Staggered) Rev. 00 HT2596 TO-263-5L Rev. 00