UP1734

UP1734 UPI | Alldatasheet

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Features

Note: (1) Please check the sample/production availability with uPI representatives. (2) uPI products are compatible with the current IPC/ JEDEC J-STD-020 requirement. They are halogen-free, RoHS compliant and 100% matte tin (Sn) plating that are suitable for use in SnPb or Pb-free soldering processes. The uP1734 is a high efficiency synchronous-rectified buck converter with internal power switches. Fixed 1.0MHz PWM operation allows possible smallest output ripple and external component size. With high conversion efficiency and small package, the uP1734 is ideally suitable for portable devices and USB/PCIE-based interface cards, where PCB area is especially concerned. With internal low RDS(ON) switches, the uP1734 is capable of delivering peak 5.0A output current over a wide input voltage range from 2.6V to 5.5V. The output voltage is adjustable from 0.6V to VIN by a voltage divider. Other features include internal soft-start, chip enable, over- voltage, under-voltage, over-temperature and over-current protections. The uP1734 is available in space-saving WDFN3x3-10L and PSOP-8L packages. Pin Configuration VDD VIN NC NC LX POK GND WDFN3x3-10L EN 5 FB6 GNDNC VIN VDD FB LX POK EN GND PSOP-8L LX VIN (uP1734P) VDD VIN NC LX LX POK GND WDFN3x3-10L EN 5 FB6 LX VIN (uP1734Q)

2 uP1734-DS-F0100, Sep. 2014 www.upi-semi.com Typical Application Circuit V N I V T U O LC T U O 2R1 R3 C V5V 1H u 0 .1F u 2 2 x2K 43K 15F p 2 2 V5V 8 .1H u 2 .2F u 0 1 x2K 5 01K 15F p 2 2 V5V 5 .2H u 2 .2F u 2 2 x2K 2 61K 15F p 2 2 V5V 3 .3H u 2 .2F u 2 2 x2K 2 32K 15F p 2 2 LXVIN POKVDD EN VIN GND Active High 22uF 1uF L VOUT C OUTC3R3 100k FB POK

3uP1734-DS-F0100, Sep. 2014 www.upi-semi.com e m a N n iPn o i t c n u F n i P X L . t u p t u Os e h c t i w S l a n r e t n I . r o t c u d n i t u p t u o e h t o t s n i p e s e h t t c e n n o C K O P . n o i t a c i d n I K O r e w o P . s r u c c o t l u a f o n d n a d n e t r a t s t f o s r e t f a e c n a d e p m i h g i h t e s si n i p s i h T N E . ) h g i H e v i t c A ( e l b a n E p i h C. g n i t a o l f o N . r e t r e v n o c e h t n w o d s t u h s w o l c i g o L B F . t u p n I k c a b d e e F tu p t u o r e h c t i w s e h t s e s n e s B F . r e i f i l p m a r o r r e e h t f o t u p n i g ni t r e v n i e h t s i n i p s i h T . k r o w t e n r e d i v i d r o t s i s e r l a n r e t x e n a h g u o r h t C N . d e t c e n n o C y l l a n r e t n I t o N D D V . y l p p u S s a i B re t l i f s s a p w o l a i v r e w o p t u p n i o t t c e n n o C . y r t i u c r i c l a n r e t ni e h t r o f r e w o p s e i l p p u S . D N Go t g n i l p u o c e d h t i w N I V . t u p n I y l p p u S r e w o P ni p s i h t e l p u o c e D . e g a t l o v t u p t u o e h t o t t n e r r u c s e i l p p u s t a ht e g a t l o v t u p n I . r o t i c a p a c c i m a r e c R 7 X r o R 5 X F u 0 1 t s a e l t a h t i wD N Go t d a P d e s o p x E. d n u o r G ro f e n a l p d n u o r g o t d e t c e n n o c d n a B C P o t d e r e d l o s e b t s u mD N Gd a p d e s o p x e e h T . e c n a m r o f r e p l a m i t p o Functional Pin Description Functional Block Diagram Control Logic Driver Current Sense Current Limit Detector Over/Under Voltage Protection Slope Comp. OSC & Shutdown Control 0.6V VREF LX FB EN VINVDD 0.93V 0.54V 0.26V POK POKGND OVP POK UVP

4 uP1734-DS-F0100, Sep. 2014 www.upi-semi.com The uP1734 is a high efficiency synchronous-rectified buck converter with internal power switches. Fixed 1.0MHz PWM operation allows possible smallest output ripple and external component size. With high conversion efficiency and a small package size, the uP1734 is ideally suitable for portable devices and USB/PCIE-based interface cards where PCB area is especially concerned. With internal low RDS(ON) switches, the uP1734 is capable of delivering peak 5A output current over a wide input voltage range from 2.6V to 5.5V. The output voltage is adjustable from 0.6V to VIN by a voltage divider. Other features include internal soft-start, chip enable, over voltage, under voltage, over temperature and over current protections. The uP1734 is available in space-saving WDFN3x3-10L and PSOP-8L packages. Input Supply Voltages, VIN & VDD The uP1734 features separate power supply and ground pins for power stages and control circuit, isolating the control circuit from noise associated with the power MOSFET switching. The VIN pins provide current to the power stage. The supply voltage range is from 2.6V to 5.5V. The uP1734 draws pulsed current with sharp edges from VIN each time the upper switch turns on, resulting in voltage ripples and spikes at supply input. A minimum 10uF ceramic capacitor with the shortest PCB trace is highly recommended for bypassing the supply input. The VDD pin provides currents for the internal control circuit. A power on reset (POR) continuously monitors the input supply voltage. The POR level is typically 2.4V at VDD rising. Use low pass filter R4 and C3 as shown in the Typical Application Circuit to filter the input noise associated with the power switching. Chip Enable/Disable and Soft-Start The uP1734 features an EN pin for enable/disable control of the output voltage. Pulling the EN pin lower than 0.4V shuts down the uP1734 and reduces its quiescent current lower than 1uA. In the shutdown mode, both upper and lower switches are turned off. Pulling EN pin higher than 1.5V enables the uP1734. Once the chip is enabled, the VDD POR is granted. The internal soft-start capacitor becomes charged and generates a linear ramping up voltage across the capacitor. This voltage clamps the voltage at the FB pin causing PWM pulse width to increase slowly and in turn reduces the output surge current. The internal 0.6V reference takes over the loop control once the internal ramping-up voltage becomes higher than 0.6V. PWM Operation The uP1734 adopts slope-compensated, current mode PWM control capable of achieving 100% duty cycle. During normal operation, the uP1734 operates at PWM mode to regulate output voltage by transferring the power to the output voltage cycle by cycle at a constant 1.0MHz Functional Description frequency. The uP1734 turns on the upper switch at each rising edge of the internal oscillator allowing the inductor current to ramp up linearly. The switch remains on until either the current limit is tripped or the PWM comparator turns off the switch for regulating output voltage. The upper switch current is sensed, slope compensated and compared with the error amplifier output COMP to determine the adequate duty cycle. The FB pin senses output feedback voltage from an external resistive divider. When the load current increases, it causes a slight decrease in the feedback voltage relative to the 0.6V reference, which in turn, causes the error amplifier output voltage to increase until the average inductor current matches the new load current. Low Dropout Mode The uP1734 increases duty cycle to maintain output voltage within its regulation as the supply input drops gradually in the battery-powered applications. The uP1734 operates with 100% duty cycle and enters low dropout mode as the supply input approaches the output voltage. This maximizes the battery life. Output Voltage Setting and Feedback Network The output voltage can be set from VREF to VIN by a voltage divider as: RE FOUT V1 R

2 R1 RV ×+=

The internal VREF is 0.6V with 1% accuracy. In real applications, a 22pF feed-forward ceramic capacitor is recommended in parallel with R2 for better transient response. Current Limit Function The uP1734 continuously monitors the inductor current for current limit by sensing the voltage drop across the upper switch when it turns on. When the inductor current is higher than current limit threshold (6A typical), the current limit function activates and forces the upper switch to turn off to limit inductor current cycle by cycle. If the load continuously demands more current than what uP1734 could provide, uP1734 cannot regulate the output voltage. Eventually under voltage protection will be triggered and shuts down the uP1734 if VFB is too low. Under Voltage Protection (UVP) Under voltage protection is triggered if the FB voltage is lower than 0.26V. Once UVP is triggered, the uP1734 turns off high-side and low-side MOSFET. The under voltage protection is latch-off function and can only be reset by toggling EN threshold or re-POR.

5uP1734-DS-F0100, Sep. 2014 www.upi-semi.com Functional Description Over Voltage Protection (OVP) Over voltage protection is triggered if the FB voltage is higher than 0.93V. Once OVP is triggered, the uP1734 turns on low-side MOSFET and turns off high-side MOSFET. The over voltage protection is latch-off function and can only be reset by toggling EN threshold or re-POR. Over Temperature Protection (OTP) The OTP is triggered and shuts down the uP1734 if the junction temperature is higher than 150O C. The OTP is a non-latch type protection. The uP1734 automatically initiates another soft start cycle if the junction temperature drops below 130O C.

6 uP1734-DS-F0100, Sep. 2014 www.upi-semi.com r e t e m a r aPl o b m ySs n o i t i d n o C t s eTn iMp yTx a M st i n U t n e r r u C y l p p u S e g n a Re g a t l o V y l p p uSV N I V N I V =D D 6 .2- -5 .5V t u o k c o L e g a t l o V r e d nUV O L V U V D D V , g n i s i RN E V =D D 5 .2- -- -V V D D V g n i l l a FN E V =D D --- -8 .1V t n e r r u C t n e c s e i uQI Q V B F I , V 8 . 0 =T U O A m 0=- -0 01- -A u t n e r r u C n w o d t u hSI N D H SV N E V 0=- -1 0 .01 A u e c n e r e f e R e g a t l o V e c n e r e f eRV F E RI T U O A m 0=4 9 5 .00 6 .06 0 6 .0V n o i t a l u g e R e n i L e g a t l o V t u p t u O∆ V T U O I , V 5 . 5 o t V 6 . 2 = N I VT U O A 0=- -3 .0- -V / % n o i t a l u g e R d a o L e g a t l o V t u p t u O∆ V T U OI T U O ) k a e p ( A 5 ~ A 0=1 -- -1 +% (Note 1) LX Pin Voltage ESD Rating (Note 2) (Note 4) (VIN = 5V, TA = 25O C, unless otherwise specified) Absolute Maximum Rating Thermal Information Recommended Operation Conditions

Electrical Characteristics

Package Thermal Resistance (Note 3) Power Dissipation, PD @ TA = 25°C

7uP1734-DS-F0100, Sep. 2014 www.upi-semi.com Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 4. The device is not guaranteed to function outside its operating conditions. r e t e m a r aPl o b m ySs n o i t i d n o C t s eTn iMp yTx a M st i n U r o t a l l i c s O y c n e u q e r F g n i h c t i wSf C S O --1 - -z H M e l c y C y t u Dm u m i x aMC DV N I V =T U OV ,B F V 5 5 . 0=0 01- -- -% s e h c t i w S r e w o P R ) N O ( S D h c t i w S r e p p U foR T E F _ PV N I I , V 6 . 3 =X L A m 0 0 1=- -0 7- -m Ω R ) N O ( S D h c t i w S r e w o L foR T E F _ NV N I I , V 6 . 3 =X L A m 0 0 1 -=- -0 5- -m Ω t u p n I c i g o L d l o h s e r h T w o L c i g o L NEV L I V N I n w o d t u h S , V 5 . 5 o t V 6 . 2=- -- -4 .0V d l o h s e r h T h g i H c i g o L NEV H I V N I e l b a n E , V 5 . 5 o t V 6 . 2=5 .1- -- -V e c n a t s i s e Rw o L l l u PNER N E --0 05- -k Ω t u p t u OK O r e w o P t n e r r u C e g a k a e L h g i H c i g oLI K O PV K O PV =D D V 5=- -- -1 A u e g a t l o Vw o L c i g oLV K O PI K O P A m 1=- -- -2 .0V d l o h s e r h T h g i H t u p t u OK O P V o t t c e p s e R h t i wB F d e r u s a e MF E R 580 9- -% s i s e r e t s y HK O P --5- -% F F O / N O r e w o P e m i T t r a t S - t f oST S S 8 .04 .10 .2s m V T U O e c n a t s i s e R e g r a h c s i D --0 01- - Ω n o i t c e t o r P V T U O n o i t c e t o r P e g a t l o V r e d n U ) f f O - h c t a L ( --4 40 5% V T U O n o i t c e t o r P e g a t l o V r e v O ) s u 0 1 = e m i T y a l e D , f f O - h c t a L (0 515 51- -% t i m i L t n e r r u C T E F S O M -PI M I L P 56 - -A e r u t a r e p m e T n w o d t u h S l a m r e hTT N D H S n g i s e d yB- -0 51- - O C s i s e r e t s y H n w o d t u h S l a m r e h T∆ T N D H S n g i s e d yB- -0 2- - O C

8 uP1734-DS-F0100, Sep. 2014 www.upi-semi.com LX 5V/Div VOUT 50mV/Div ILX 2A/Div LX 5V/Div VOUT 50mV/Div ILX 2A/Div EN 5V/Div LX 5V/Div VOUT 1V/Div POK 5V/Div EN 5V/Div LX 5V/Div VOUT 1V/Div POK 5V/Div VIN 2V/Div LX 5V/Div VOUT 500mV/Div POK 5V/Div VIN 2V/Div LX 5V/Div VOUT 500mV/Div POK 5V/Div Typical Operation Characteristics Power Off from VIN Time (4ms/Div) VIN = 5V, VOUT = 1.05V, IOUT = 3A Power On from VIN Time (2ms/Div) VIN = 5V, VOUT = 1.05V, IOUT = 3A EN Turn On Time (400us/Div) VIN = 5.0V, VOUT = 1.8V, IOUT = 3A EN Turn Off Time (10us/Div) VIN = 5.0V, VOUT = 1.8V, IOUT = 3A Load Transient Time (100us/Div) VIN = 5.0V, VOUT = 1.8V, IOUT = 0A ~ 3A Load Transient Time (100us/Div) VIN = 5.0V, VOUT = 1.8V, IOUT = 1.5A ~ 3A

9uP1734-DS-F0100, Sep. 2014 www.upi-semi.com POK 5V/Div LX 2V/Div VOUT 1V/Div POK 5V/Div LX 5V/Div VOUT 1V/Div ILX 5A/Div 100 VIN = 2.6V VIN = 3.3V VIN = 5.0V LX 2V/Div VOUT 1V/Div POK 5V/Div LX 2V/Div VOUT 10mV/Div ILX 2A/Div LX 2V/Div VOUT 10mV/Div ILX 2A/Div Typical Operation Characteristics Switching Time (2us/Div) VIN = 5.0V, VOUT = 1.8V, IOUT = 3A Switching Time (2us/Div) VIN = 5.0V, VOUT = 1.8V, IOUT = 1.5A Over Current Protection Time (4us/Div) VIN = 5.0V, VOUT = 1.8V Under Voltage Protection Time (4us/Div) VIN = 5.0V, VOUT = 1.8V Over Voltage Protection Time (10us/Div) VIN = 5.0V, VOUT = 1.8V Efficiency vs. Output Current Output Current (A) VOUT = 1.05V Efficiency (%)

10 uP1734-DS-F0100, Sep. 2014 www.upi-semi.com 100 VIN = 5.0V Efficiency vs. Output Current Output Current (A) VOUT = 1.8V Efficiency (%) Efficiency vs. Output Current Output Current (A) VOUT = 3.3V Efficiency (%) Typical Operation Characteristics 100 VIN = 2.6V VIN = 3.3V VIN = 5.0V

11uP1734-DS-F0100, Sep. 2014 www.upi-semi.com

Package Information

1.Package Outline Unit Description: BSC: Basic. Represents theoretical exact dimension or dimension target MIN: Minimum dimension specified. MAX: Maximum dimension specified. REF: Reference. Represents dimension for reference use only. This value is not a device specification. TYP. Typical. Provided as a general value. This value is not a device specification. 2.Dimensions in Millimeters. 3.Drawing not to scale. 4.These dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.15mm. WDFN3x3-10L 6 10 0.18 - 0.300.50 BSC 2.90 - 3.10 2.90 - 3.10 1.40 - 1.80 0.00 - 0.050.20 REF 0.70 - 0.80

12 uP1734-DS-F0100, Sep. 2014 www.upi-semi.com 1.Package Outline Unit Description: BSC: Basic. Represents theoretical exact dimension or dimension target MIN: Minimum dimension specified. MAX: Maximum dimension specified. REF: Reference. Represents dimension for reference use only. This value is not a device specification. TYP. Typical. Provided as a general value. This value is not a device specification. 2.Dimensions in Millimeters. 3.Drawing not to scale. 4.These dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.15mm. PSOP-8L 0.31 - 0.51 4.80 - 5.00 5.79 - 6.20 0.10 - 0.25 0.40 - 1.27

1.27 BSC

3.80 - 4.00 1.90 - 2.55 2.60 - 3.40 0.00 - 0.15

1.70 MAX

13uP1734-DS-F0100, Sep. 2014 www.upi-semi.com Important Notice uPI and its subsidiaries reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. uPI products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment. However, no responsibility is assumed by uPI or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of uPI or its subsidiaries. COPYRIGHT ( C ) 2011, UPI SEMICONDUCTOR CORP. uPI Semiconductor Corp. Headquarter 9F.,No.5, Taiyuan 1st St. Zhubei City, Hsinchu Taiwan, R.O.C. uPI Semiconductor Corp. Sales Branch Office 12F-5, No. 408, Ruiguang Rd. Neihu District, Taipei Taiwan, R.O.C.