dip-8 sop 7 2018/2/14 5:53 2018/2/13 1:00 st5602 · st5602 v 2.0 1 of 8 30v, 2.4a synchronous buck...

ST5602

http://www.stcomponent.com V 2.0 1 of 8

30V, 2.4A SYNCHRONOUS BUCK CONTROLLER

DESCRIPTION

The STComponent ST5602 is a synchronous step down regulator from a high voltage input supply. Operating with an input voltage range from 8V to 30V, the ST5602 achieves 2.4A continuous output current with excellent load and line regulation. The switching frequency is programmable from 135kHz to 500kHz and the synchronous architecture provides for highly efficient designs. Current mode operation provides fast transient response and eases loop stabilization. The ST5602 requires a minimum number of readily available standard external components. Other features include cable compensation, programmable current limit, thermal shutdown and output short protection. TYPICAL APPLICATION CIRCUIT

VIN

GND

SW

COUT

+

-

Current Limit Bandgap

Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

VOUT VIN ST5602

4

7,8

5,6

RT

FB

2

1

R2 = 390kΩ

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

47µF CIN

+

L = 33µH

200pF

R1 = 120kΩ

+

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

100µF

8V ~ 30V

VOUT = 1.21V × ( 1 + R2 R1 )

5V

ILIM 3

C1 (Optional)

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

+

-


Reference Voltage

Err Amp.

R1 R2

RILIM

68kΩ

RT

Figure 1: ST5602 Typical Application Circuit

FEATURES

n Wide Input Voltage Range: 8V ~ 30V n 2.4A Output Current n Up to 93% Efficiency n Programmable Switching Frequency Up to

500kHz n No Loop Compensation Required n Programmable Current Limit n Thermal Shutdown n Output Short Protection

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DEVICE SUMMARY

Ordering Code Package Type Package Material Marking (1) Shipping

ST5602A SOP-8 Lead free

3

Figure 1: Internal Schematic Diagram

TO-220

5602 YM

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Category :MOSFET Number of pins :8 Pitch :0.0

Size :[X] 5.0 [Y] 3.9 [Z] 1.7 Body :Multi FTP origin :None

Product available? :Yes Supplier :Manufacturer � �

Description of part :

Rohm SOP8(Tr)

External links * You will move to an external web site

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close

1

8

4

5

3 2

6 7

SOP-8

Taping reel

ST5602AG SOP-8 Halogen free Taping reel

Note 1: Y: Year code; M: Month code.

INTERNAL SCHEMATIC DIAGRAM

+

-

+

-

+

+

-

+

-

-

VREF 1.21V

+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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R1 R2

Oscillator

Integrator

SW

5

SW

6

SW

SW

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GN

D

2

GN

D

1

GN

D

3

Driv

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Driv

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SW

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V CC

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6

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3

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Driv

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Sam

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VCC UVLO

Thermal Shutdown

VT

DRV

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-


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+

-


Reference Voltage

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-


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Current Limit Comparator

Synchronous Detect

DRVP

DRVN LOGIC

AMP

Bias Regulator

Vbias 1.21V

VDD

VCC

DRV

+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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+

-


Reference Voltage

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+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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R1 R2

+

-


Reference Voltage

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R1 R2

VCC

VCC

VDD IREF

VIN 4

GND 8

SW

SW 6

5

GND 7

RT 2

FB 1

ILIM 3

ST5602


PIN DESCRIPTION

PAD No. PIN NAME Description

1 FB Feedback pin. Receive the feedback voltage from an external resistive divider across the output. In the adjustable version, the output voltage is fixed. The output voltage is set by R1 and R2: VOUT = 1.21V � [1 + (R2/R1)].

2 RT The internal oscillator is set with a single resistor between this pin and GND.

3 ILIM Monitors current through the high-side switch and triggers current limit operation if the inductor valley current exceeds a user defined value that is set by RILIM and the sense current sourced out of this pin during operation.

4 VIN Power Supply. Bypass a capacitor between VIN and GND, with a 47F or greater ceramic capacitor to prevent large voltage spikes of input terminal.

5, 6 SW Switch node connection to inductor.

7, 8 GND Ground Terminals.

ABSOLUTE MAXIMUM RATINGS

(2)

TA = 25°C, All voltage respect to GND unless otherwise specified.

PARAMETER SYMBOL RATINGS UNIT

Input Supply Voltage VIN -0.3 ~ 35 V

FB, ILIM & RT Pins Voltage VFB, VILIM, VRT -0.3 ~ 6 V

SW Pin Voltage VSW -0.3 ~ (VIN +1) V

Operating Temperature Range (3) Topr -40 ~ +85 °C

Power Dissipation PD Internal limited

Thermal Resistance, Junction-to-Ambient RθJA 410 °C/W

Thermal Resistance, Junction-to-Case RθJC 42 °C/W

Maximum Junction Temperature TJMAX +150 °C

Storage Temperature Range Tstg -65 ~ +150 °C

Soldering Temperature & Time (10 Seconds) Tsolder +260 °C Note 2: Absolute Maximum Ratings are those values beyond which the device could be permanently damaged. Exposure to

absolute-maximum-rated conditions for extended periods may affect device reliability. Note 3: The ST5602 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the -40°C to +85°C

operating temperature range are assured by design, characterization and correlation with statistical process controls.

ST5602


ELECTRICAL CHARACTERISTICS TA = 25°C, Test circuit refers to Figure 1. All voltage respect to GND unless otherwise noted.

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Quiescent Current IQ No loading 15 20 25 mA

VIN Operating Voltage VIN 8 30 V

VIN UVLO Threshold VUVLO 4.3 4.5 V

UVLO Hysteresis ΔVUVLO 50 100 mV

Current Limit Sense Pin Source Current IILIM_TH 8.5 10 11.5 µA

Feedback Pin Input Current IFB 0.05 µA

Regulated Voltage VFB 1.19 1.21 1.23 V

Oscillator Frequency fOSC RT floating 120 135 150 kHz

Maximum Oscillator Frequency fOSC_MAX 100 500 kHz

Maximum Duty Cycle DC 100 %

PMOS Turn-On Resistance RPFET 65 mΩ

NMOS Turn-On Resistance RNFET 30 mΩ

Thermal Shutdown TSD Temperature rising 160 °C

Thermal Shutdown Hysteresis ΔTSD 30 °C

APPLICATION INFORMATION

Introduction The ST5602 operates by a constant frequency, current mode architecture. The output voltage is set by an external divider and returns to the FB pin. An error amplifier compares the divided output voltage with a reference voltage of 1.21V and adjusts the peak inductor current accordingly. Thermal Protection The total power dissipation in ST5602 is limited by a thermal protection circuit. When the device temperature rises to approximately 160°C, this circuit turns off the output, allowing the IC to cool. The thermal protection circuit can protect the device from being damaged by overheating in the event of fault conditions. Continuously running the ST5602 into thermal shutdown degrades device reliability.

ST5602


Current Limit Current limit detection occurs during the on-time by monitoring the current through the high-side PMOS. The current limit value is defined by RILIM. If during the on-time the current in the high-side PMOS exceeds the user defined current limit value, the next on-time cycle immediately terminated. Current sensing is achieved by comparing the voltage across the high-side FET with the voltage across the current limit set resistor RILIM. The current limit value rises when the set resistor RILIM rises. For example, when RILIM is 39kΩ, 68kΩ and 100kΩ, the corresponding IMAX are 1.8A, 2.6A and 3.5A respectively. Oscillator Frequency The ST5602 oscillator frequency is set by a single external resistor connected between the RT and GND. The resistor should be located very close to the device and connected directly to the pins of the IC (RT and GND). The oscillator frequency rises when the resistor RT falls. In general, it is recommended that the user set the oscillation frequency to within 200kHz. (The reference is as follows: when RT is 100kΩ, 200kΩ and 500kΩ, the corresponding frequency is 460kHz, 360kHz and 250kHz respectively.) Setting Output Voltage The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to use divider resistors with 1% tolerance or better. To improve efficiency at very light loads consider using larger value resistors. If the values are too high the regulator is more susceptible to noise and voltage errors from the FB input current are noticeable. For most applications, a resistor in the 10kΩ to 1MΩ range is suggested for R1. R2 is then giving by:

R2 = R1 � [(VOUT / 1.21) - 1] Output Cable Resistance Compensation To compensate for resistive voltage drop across the charger’s output cable, the ST5602 integrates a simple, user-programmable cable voltage drop compensation using the impedance at the FB pin. Choose the proper feedback resistance values for cable compensation. The delta VOUT voltage rises when the feedback resistance R1 value rises, use the equation below:

ΔVOUT (V) = R1 (kΩ) � IOUT (A)/1100 Inductor Selection For most applications, the value of the inductor will fall in the range of 4.7µH to 47µH. Its value is chosen based on the desired ripple current. Large value inductors lower ripple current and small value inductors result in higher ripple currents. Higher VIN or VOUT also increase the ripple current as shown in equation. A reasonable starting point for setting ripple current is ΔIL = 1.04A (40% of 2.6A).

ΔIL = (1/f � L) � VOUT � (1 – VOUT/VIN)

The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation. Thus, a 3.64A rated inductor should be enough for most applications (2.6A + 1.04A). For better efficiency, choose a low DC-resistance inductor. Different core materials and shapes will change the size/current and price/current relationship of an inductor. The choice of which style inductor to use often depends more on the price vs. size requirements and any radiated field/EMI requirements than on what the ST5602 requires to operate.

ST5602


Output and Input Capacitor Selection In continuous mode, the source current of the top MOSFET is a square wave of duty cycle VOUT/VIN. To prevent large voltage transients, a low ESR input capacitor sized for the maximum RMS current must be used. The maximum RMS capacitor current is given by:

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US $0.1-0.2 / Piece


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Original TNY379PN


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US $0.001-4 / Piece


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US $0.0058-0.29 / Piece


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chip DIP-7--YXDS3

US $0.100-2.00 / Piece


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Efficient, Low Power

US $0.02-0.05 / Piece


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VIPER17L Power IC

US $0.1-1 / Piece


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US $0.001-10 / Piece


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US $0.01-9.9 / Piece


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US $0.01-0.1 / Piece


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US $0.37-0.74 / Piece


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US $0.32-1.5 / Piece


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US $0.01-100 / Piece


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US $0.5-1 / Piece


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Regulator ICs A6069H


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CIN required IRMS � IOMAX [VOUT (VIN ��OUT)]½

VIN

The formula has a maximum at VIN = 2 � VOUT, where IRMS = IOUT/2. This simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. Note that the capacitor manufacture’s ripple current ratings are often based on 2000 hours of life. This makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required. Always consult the manufacturer if there is any question. The selection of COUT is driven by the required effective series resistance (ESR). Typically, once the ESR requirement for COUT has been met, the RMS current rating generally far exceeds the IRIPPLE(P-P) requirement. The output ripple ΔVOUT is determined by:

ΔVOUT = ΔIL � {ESR + [1/(8 � f � COUT)]}

Where f = operating frequency, COUT = output capacitance and ΔIL = ripple current in the inductor. For a fixed output voltage, the output ripple is highest at maximum input voltage since ΔIL increases with input voltage. Aluminum electrolytic and dry tantalum capacitors are both available in surface mount configurations. In the case of tantalum, it is critical that the capacitors are surge tested for use in switching power supplies. An excellent choice is the AVX TPS series of surface mount tantalum. These are specially constructed and tested for low ESR so they give the lowest ESR for a given volume. Board layout Suggestions When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the ST5602. Check the following in your layout. n The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short,

direct and wide. n Put the input capacitor as close as possible to the device pins (VIN and GND). n SW node is with high frequency voltage swing and should be kept small area. Keep analog

components away from SW node to prevent stray capacitive noise pick-up. n Connect all analog grounds to a command node and then connect the command node to the power

ground behind the output capacitors.

ST5602


PACKAGE DIMENSION SOP-8

D

A2 A

A1

E1 E

b e

L

L1

c

SYMBOL Dimensions in Millimeters Dimensions in Inches

MIN MAX MIN MAX A 1.750 0.069

A1 0.050 0.230 0.002 0.090 A2 1.300 1.500 0.051 0.059 b 0.350 0.450 0.014 0.018 c 0.180 0.250 0.007 0.010 D 4.700 5.100 0.185 0.201 E 5.800 6.200 0.228 0.244

E1 3.700 4.100 0.146 0.161 e 1.270 (BSC) 0.050 (BSC) L 0.400 0.800 0.016 0.031

L1 1.050 (BSC) 0.041 (BSC)

ST5602


NOTICE Information furnished by STComponent is believed to be accurate and reliable. However, no responsibility is assumed for its use. Customers are responsible for their products and applications using STComponent components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. STComponent reserves the right to make changes to their products or specification without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete.

dip-8 sop 7 2018/2/14 5:53 2018/2/13 1:00 st5602 · st5602 v 2.0 1 of 8 30v, 2.4a synchronous buck...

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