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Technical content

Features

Input voltage range — 2.3V to 5.5V 1.2A continuous output current 4MHz switching frequency Adjustable Output Voltage 1% output voltage accuracy Adaptive On-Time architecture Up to 100% duty cycle Up to 96% peak efficiency Power Save mode for efficient light load operation >90% efficiency 30mA to 75mA 0.1μA shutdown current 21μA quiescent current Power Good Indicator Pre-bias startup protection Internal soft start 1.5mm x 2mm, 6-Lead MLPD package WEEE and RoHS compliant and halogen-free

Applications

Description

The SC21152 is an ultra high efficiency 1.2A DC/DC buck regulator available in a small MLPD package. These fea - tures make the SC21152 perfect for small form factor con- sumer applications where high efficiency is essential. SC21152 is an Adaptive On-Time 4MHz switching regula - tor at full load conditions. Under light load conditions it transitions into PFM Power Save Mode and reduces switch- ing frequency thus saving energy. High switching fre - quency operation allows the use of a very small 0.47μH inductor along with small input and output capacitors to minimize overall circuit size. The SC21152 is highly configurable with a wide range of factory options including internal soft start time, fixed or adjustable output voltage, automatic output discharge, and switching frequency. The SC21152 is offered in a small 6-Lead 1.5mm x 2mm MLPD package. Adjustable Output Voltage 2.3V-5.5V Supply SC21152 0.47µH 1.2A Output EN VIN LX EN GND FB 10µF4.7µF PG Power Good Fixed Output Voltage 2.3V-5.5V Supply SC21152 0.47µH 1.2A Output EN VIN LX EN GND FB 10µF4.7µF PG Power Good

Ordering Information

Device (1)(2) Options(3) Package Output(3) Soft Start(3) Output Discharge(3) SC21152AULTRC Adjustable 100μs Automatic 1.5mm x 2mm 6-Lead MLPD SC21152EVB Evaluation Board 1.5mm x 2.0mm 6-Lead MLPD Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free packaging only. Device is WEEE and RoHS compliant and halogen-free. (3) For other device options not shown contact Semtech Marketing. The following options can be made available: VOUT options : adustable and fixed output voltage from 0.8V to 3.6V in 50mV increments. Soft Start options: internal 100μs, 200μs, 400μs, or 800μs. Output Discharge options: Automatic Discharge and No Discharge. Frequency: The default operating frequency is 4MHz with options of 2.2MHz, 3MHz, or 6MHz. Pin Configuration Marking Information T O P V IE W 6-Lead M LP D 1.5x2.0 (m m) 1.5x2.0 (m m) 6-Lead M LP D T O P V IE W R C A oyw Pin Assignments 6-Lead MLPD Pin # Name

1 VIN

5 GND

1.5x2.0 (mm) 6-Lead MLPD Marking Diagram RCA = Device Marking Code oyw = Pin 1 Indicator and Date Code

Recommended Operating Conditions Output Voltage Range, Adjustable VOUT (V) . . . 0.8 to VIN Thermal Information Thermal Resistance Junction to Ambient (2) (°C/W ) Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. NOTES: (1) Tested according to JEDEC standard JESD22-A114-B. (2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.

Electrical Characteristics

Parameter Symbol Conditions Min Typ Max Units Input Supply Input Supply Voltage Range VIN 2.3 5.5 V Shutdown Current ISD EN = 0V 0.1 μA Quiescent Current IQ Operating, No Load, Power Save Option 21 μA Under Voltage Lock Out Threshold UVLOrise VIN rising edge 2.05 2.16 2.27 V Under Voltage Lock Out Hysteresis UVLOhyst 85 mV Output Voltage Feedback Voltage VFB Adjustable VOUT Option only 0.80 V Feedback Voltage Tolerance VFBtol PWM operation, 500mA load -2 +/- 1 +2 % Feedback Input Leakage Current IFB Adjustable VOUT Option 1 25 nA Output Voltage Range Vout Adjustable Output Voltage 0.8 VIN V

Parameter Symbol Conditions Min Typ Max Units Output Voltage (continued) Output Voltage Line Regulation dVline 5.5V > VIN > (Vout +1), PWM operation 0.17 %/V Output Voltage Load Regulation dVload 500mA < ILOAD < 1.2A -0.13 %/A Maximum Output Current IOUT Continuous current 1.2 A Soft Start(1) Soft Start Time (1) TSS FB: from rising edge to 95% of final value 100 μs LX Switching Node On Resistance High-side Rdson_hs FB = 0V; ILX = 500mA 180 mΩ On Resistance Low-side Rdson_ls FB = VIN; ILX = 500mA 140 mΩ LX Leakage Current High Side ILX_hs VIN = 5.5V; FB = VIN; VLX = 0V -1.5 -0.1 μA LX Leakage Current Low Side ILX_ls FB = 0V; VLX = VIN; Vout Automatic Discharge disabled 0.1 1 μA LX Pulldown Current(1) ILX_pd EN = 0V; VLX = 1V; Vout Automatic Discharge enabled 20 mA Switching Frequency(1) Fsw 4MHz PWM operation, 500mA load, adjustable output, VOUT = 2.5V 3.6 4.0 4.4 MHz Current Sense High Side Current Limit ILIMhs Current from VIN to LX 1.5 2.2 3.0 A Low Side Current Limit ILIMls Current from LX to GND -0.8 A Zero Cross Detector Threshold Ithzcpfm Power Save Mode and DC Test condition 0 mA Thermal Protection Over-Temperature Shutdown Tts_rise Rising temperature 160 °C Over-Temperature Hysteresis Tts_hyst 10 °C EN Input EN Input High Threshold VIHen 1.2 V EN Input Low Threshold VILen 0.4 V EN Input High Current IIHen VEN = VIN -1 μA EN Input Low Current IILen VEN = 0V 1 μA Electrical Characteristics (continued)

Electrical Characteristics (continued) Parameter Symbol Conditions Min Typ Max Units Power Good Output(1) PG Low Voltage VLOpg IPG = 5mA 0.4 V PG Open Leakage Current IOHpg VPG = VIN 1 μA Power Good Threshold PGth FB rising edge, percentage of FB final value 95 % Power Good Threshold Hysteresis PGthhy percentage of FB final value (rising to falling edge) 3 % Power Good Assert Time PGtdr from FB = Power Good Threshold to PG open drain 75 μs Power Good Deassert Time PGtdf from falling edge of FB to PG pulled to GND 13 μs Notes: (1) The SC21152 can be configured with a range of options as shown. Contact Semtech Marketing for more information. VOUT options: adjustable or fixed output voltage. For fixed VOUT, the voltage can be specified from 0.8V to 3.6V in 50mV increments. Soft Start options: Fixed 100μs with options of 200μs, 400μs, and 800μs. Frequency options: Operating frequency is 4MHz with options of 2.2MHz, 3MHz, or 6MHz. Output Discharge options: VOUT Automatic Discharge or No Discharge.

Efficiency vs. Load - 5VIN 100 0.01 0.10 1.00 Efficiency (%) Load (A) 0.8V 1.0V 1.2V 1.5V 1.8V 2.2V 2.5V 3.3V Efficiency vs. Load - 4.2VIN 100 0.01 0.10 1.00 Efficiency (%) Load (A) 0.8V 1.0V 1.2V 1.5V 1.8V 2.2V 2.5V 3.3V Efficiency vs. Load - 3.3VIN 100 0.01 0.10 1.00 Efficiency (%) Load (A) 0.8V 1.0V 1.2V 1.5V 1.8V 2.2V 2.5V Efficiency vs. Load - 2.3VIN 100 0.01 0.10 1.00 Efficiency (%) Load (A) 0.8V 1.0V 1.2V 1.5V Efficiency vs. Load - VOUT 1.0V 100 0.01 0.10 1.00 Efficiency (%) Load (A) 2.3VIN 3.3VIN 4.2VIN 5.0VIN VIN = 5.0V, VOUT as shown, Load = 0 to 1.2A VIN = 4.2V, VOUT as shown, Load = 0 to 1.2A VIN = 3.3V, VOUT as shown, Load = 0 to 1.2A VIN = 2.3V, VOUT as shown, Load = 0 to 1.2A Efficiency vs. Load - VOUT 1.8V 100 0.01 0.10 1.00 Efficiency (%) Load (A) 2.3VIN 3.3VIN 4.2VIN 5.0VIN VIN as shown, VOUT = 1.0V, Load = 0 to 1.2A VIN as shown, VOUT = 1.8V, Load = 0 to 1.2A

Frequency vs load - 5VIN, PWM operation 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 Frequency (MHz) Load (A) 0.8V 1.0V 1.2V 1.5V 1.8V 2.2V 2.5V 3.3V Frequency vs load - 3.3VIN, PWM operation 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 Frequency (MHz) Load (A) Frequency vs load - 2.3VIN, PWM operation 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 Frequency (MHz) Load (A) 0.8V 1.0V Quiescent Current vs Output Voltage Quiescent Current (uA) VOUT (V) 2.3V 3.3V 4.2V 5.0V RDSON vs. Input Voltage 120 160 200 240 280 320 360 RDSON (mŸ) VIN (V) High-side Low-side VIN = 2.3V, VOUT as shown, Load = 0.5A to 1.2A VIN as shown, VOUT as shown, no load, Rbot = 100kΩ RDSON vs. Temperature 100 120 140 160 180 200 220 240 260 280 -40 -25 -10 5 20 35 50 65 80 95 110 125 RDSON (mŸ) Junction Temperature (°C) High-side Low-side

Typical Characteristics (continued) Power Save Operation — no load Time (4ms/div) VIN = 5V, VOUT = 1.5V, 0mA load VOUT (20mV/div) LX (5V/div) Startup - VIN ramp Time (100µs/div) VIN = EN = ramp to 2.3V , VOUT = 1.5V, 0mA load VOUT (0.5V/div) LX (5V/div) Power Save Operation — 50mA load Time (2μs/div) VIN = 5V, VOUT = 1.5V, 50mA load VOUT (20mV/div) LX (5V/div) Startup - EN control Time (100µs/div) VOUT (0.5V/div) LX (5V/div) VIN = 5V, VOUT = 1.5V, 0mA load PWM Operation — 1.2A Time (200ns/div) VOUT (20mV/div) LX (5V/div) VIN = 5V, VOUT = 1.5V, 1.2A load Startup - 1.2A load Time (100µs/div) VOUT (2V/div) LX (5V/div) VIN = 5V, VOUT = 3.3V, 1.2A Load PG (2V/div) VIN, EN (2V/div) EN (5V/div) PG (5V/div) EN (5V/div) PG (5V/div)

Typical Characteristics (continued) Load Transient - Power Save PFM to PWM Time (100μs/div) VIN = 5V, VOUT = 1.0V, Load 0A to 1.2A to 0A VOUT (50mV/div) LX (5V/div) Load Transient - Power Save PFM to PWM Time (100µs/div) VIN = 5V, VOUT = 3.3V, Load 0A to 1.2A to 0A VOUT (0.1V/div) LX (5V/div) Load Transient - PWM to PWM Time (100μs/div) VIN = 5V, VOUT = 1.0V, Load 0.5A to 1.2A to 0.5A VOUT (50mV/div) LX (5V/div) Load Transient - PWM to PWM Time (100µs/div) LOAD (1A/div) LX (5V/div) VIN = 5V, VOUT = 3.3V, Load 0.5A to 1.2A to 0.5A PWM Minimum Off Operation Time (2µs/div) VOUT (50mV/div) LX (5V/div) VIN = 3.6V, VOUT = 3.3V, 500mA Load Overcurrent Shutdown and Recovery Time (2ms/div) VOUT (1V/div) LX (5V/div) VIN = 5V, VOUT = 1.0V, Load 0A to 2.0A to 0A LOAD (1A/div) VOUT (0.1V/div) LOAD (1A/div) LOAD (1A/div) LOAD (1A/div)

Detailed Application Circuits Adjustable Output Voltage 2.3V-5.5V Supply SC21152 0.47µH 1.2A Output EN VIN LX EN GND FB 10µF4.7µF PG Power Good Fixed Output Voltage 2.3V-5.5V Supply SC21152 0.47µH 1.2A Output EN VIN LX EN GND FB 10µF4.7µF PG Power Good Rbot Rtop Ctop VOUT L CIN COUT Rtop Ctop Rbot 0.8V 0.47uH Current rating 1.2A minimum Murata LQM21PNR47MGH 2x1mm, 40mΩ Wurth 74479876147 2x1mm, 40mΩ 4.7uF 0402 X5R 10uF 0402 X5R zero n/a n/a 1.0V 24.9kΩ 22pF 100kΩ 1.2V 49.9kΩ 100kΩ 1.5V 88.7kΩ 100kΩ 1.8V 124kΩ 100kΩ 2.2V 24.9kΩ 100kΩ 2.5V 174Ω 100kΩ 2.8V 249kΩ 100kΩ 3.3V 316kΩ 100kΩ

Pin Descriptions - 1.5x2mm 6-lead MLPD Pin # Pin Name Pin Description 1 VIN Input Supply Voltage for the device and sense point for the input Under Voltage Lock Out. 2 PG Power Good Output. Open-drain Power Good indicator. An open indicates that the output voltage is in regulation. The Power Good pin requires an external pullup. 3 EN Enable input. Connect to logic high or VIN to enable the device. Connect to logic low or GND to dis- able the device. 4 FB Feedback input (output voltage sense). For adjustable VOUT options, connect to the midpoint of a resistor divider between the output capacitor and GND. For fixed VOUT options connect to the output capacitor. 5 GND Ground connection. 6 LX Switching node connection to inductor. PAD PAD Thernal ground for heatsinking. Connect to GND with multiple vias. Block Diagram P W M/P ow er S ave C ontroller G N D V IN G ain A m p LX E N P M O S N M O S R am p G en IC O M PP W M C om p G ate D rive IC O M P R ef F ixed / A djustable V out S elect D evice E nable and U V LO P G P ow er G ood F B P A DP A DF B

Synchronous Buck Converter The SC21152 is a synchronous buck regulator that employs an adaptive on-time architecture to provide fast transient response and very small circuit area. The SC21152 oper- ates over an input voltage range of 2.3 to 5.5V. Operating Modes The SC21152 operates in one of four different modes depending on the status of VIN, VOUT, and load. PWM Adaptive On-time operation (AOT) PWM Minimum Off-time operation (Min Off ) PFM (Pulse Frequency Modulation for Power Saving) Drop-Out operation (LDO mode) PWM AOT Mode Operation During PWM AOT operation the controller uses adaptive on-time control. The FB ripple signal is routed to a gain stage and then to the internal comparator and reference which trigger the high-side pulses. The reference includes a compensation ramp which emulates the inductor current to provide stable switching. AOT operation is used when the low-side pulse-width (off- time) is greater than the minimum 60nsec. A switching cycle in AOT mode is as follows: On-time: the cycle starts with the high-side mosfet turn-on. The pulse width is set by the following formula where fsw is 4MHz: 6:,10$; 287 97 u Off-time: after the high-side on-time is com - pleted, the low-side mosfet turns on to begin the off-time. The off-time pulse width is set by the internal compensation ramp and under static conditions results in typically 4MHz switch- ing frequency. Note that the SC21152 enters AOT operation if VIN is less than VOUT/0.88. PWM Min Off Operation The device will enter Minimum Off-time operation (Min Off ) when VIN, VOUT, and load conditions force the off- time (time between high-side pulses) to the minimum value, typically 60nsec. This indicates that the controller has reached maximum duty cycle for AOT operation and longer duty cycles are needed. In Min Off operation the SC21152 uses constant off-time control. As in AOT operation, the FB ripple signal is routed to a gain stage and then to the internal AOT comparator and reference. In Min Off mode, the FB ripple triggers the low-side turn-on. Min Off switching cycle operation is as follows: Off-time: The low-side mosfet is on for a fixed Minimum Off time of 60nsec. This draws current from the output capacitor through the inductor via the LX pin and causes the output to fall. On-time: after the Min Off time of 60nsec has elapsed, the high-side mosfet turns on. This helps recharge the output capacitor and bring the output voltage up. The on-time pulse width is determined by the internal compensation ramp. Drop-out Operation When operating in Min Off mode, the off-time is constant and the high-side on-time varies in order to regulate the output. For cases where VIN is near VOUT, the high-side will remain on continually with 100% duty cycle. The output voltage will then be limited by the input voltage, high-side RDS ON and inductor DCR as shown in the fol - lowing equation: '&5 Note that RDS ON is a function of input voltage and tem - perature. Inductor DC resistance also increases with temperature. Power Save (PFM) Operation In PFM operation, the FB ripple signal is routed to a gain stage and compared to an internal reference. A switch - ing cycle is as follows. Applications Information

Applications Information (continued) On-time: The high-side mosfet turns on, as trig- gered by the FB signal falling to the internal ref- erence. The high-side stays on for a predetermined time based on VIN and VOUT, then turns off. Off-time: the low-side mosfet turns on. Inductor current is monitored via the low-side switch. When the current falls to zero, the low-side mosfet turns off. Dead-time: both mosfets are off. If the FB signal is higher than the internal reference, both mosfets remain off. During the dead-time the load current is supplied by the output capacitor, causing the output and the FB signal to fall. When the FB signal falls to the 800mV threshold, the next high-side pulse begins. As load current increases, the dead-time between pulses reduces. On any cycle, if the minimum off-time (60nsec) has elapsed and the FB signal is calling for another high- side on-time, the controller exits PFM and enters PWM operation. Once the controller is in PWM operation, the inductor current must go below zero (go negative) for 16 switch - ing cycles before the controller will return to PFM operation. Soft start The SC21152 contains an internal soft start to reduce inrush current during start-up. During start-up, the FB signal is compared to an internal ramp, providing a gradual ramp on VOUT. The timing to move VOUT from 0V to 95% of final value is typically 100usec. Optional soft start times of 200usec, 400usec, and 800usec can be provided. Pre-bias Start-up During start-up, the low-side mosfet turns off if the induc- tor current falls negative (into the LX pin) on any cycle. This prevents discharge of the output capacitor during the soft-start cycle. Note that if the output is loaded during a Pre-Bias start-up, the output voltage may fall until the internal Soft-start ramp rises above the voltage seen at the FB pin. Power Good Indicator The SC21152 includes a open-drain Power Good (PG) indicator. The PG output is in a logic high (open) state when the FB pin is above 95% of the final value (above 760mV). The PG threshold has 3% hysteresis to prevent chattering. During a start-up cycle, the PG output is pulled low typi - cally 30usec before the start of mosfet switching. The PG output stays low until the FB pin exceeds 95% of the final, which begins the PG Assert Time delay of 75μsec. After the Assert Time has passed, the PG output will drive high (open circuit). If the FB signal falls to the falling edge PG threshold, a Deassert Time delay of 13μsec must elapse before the PG output will change to logic low. The PG pin requires a pull-up resistor to provide a logic high to a microcontroller. If the PG signal is not used at the system level, the pull-up resistor can be omitted. Note that the PG output is high (open) when the EN pin is low. This prevents power loss in the PG pull-up resistor when the device is disabled. VIN Under-Voltage Lockout The SC21152 includes an under-voltage lockout (UVLO) to inhibit switching until the input voltage exceeds 2.16V. The VIN UVLO threshold has 85mV hysteresis to prevent chatter during start-up. EN Input The EN input is a logic level input. When EN is set to logic high, the SC21152 goes through an internal reset to prepare for operation. The soft-start ramp and mosfet switching begin typically 50μsec after EN is driven high. When EN is low (grounded), the SC21152 is off and in its lowest power state. The power mosfets are off and the PG output is high (open). The automatic discharge mosfet on LX is on to discharge the output before the next start- up cycle. Automatic Discharge When the EN pin is pulled low (grounded), the power mosfets are tri-stated and the LX pin is connected to GND through an internal mosfet to discharge the output capacitors. Typical mosfet RDS ON is 40 ohms at 5V and

25°C. Note that RDS ON is a function of both VIN and temperature. The automatic discharge feature can optionally be dis - abled from the device. Over-current Protection The SC21152 provides overload protection through pulse by pulse current limiting. During the high-side on-time, the high-side switches off if the inductor current exceeds 2.2A typically. The low-side turns on briefly, followed by the next high-side on-time. Switching continues while the output overload exists. When the overload is removed, the SC21152 will resume normal operation. If the over - load causes high junction temperature, the SC21152 will go into Over-temperature protection. Over-temperature Protection The SC21152 will shut down if the junction temperature exceeds typically 160 °C. The device will automatically restart after the junction temperature has dropped typi - cally 10 °C. Component Selection The SC21152 is optimized for use with components as shown in the Detailed Applications Circuit on page 10. Inductor: the inductor should be 0.47uH and capable of supporting a minimum current of 1.2A. Input capacitor: ceramic capacitor, minimum 4.7uF, X5R or X7R or better dielectric. Output capacitor: ceramic capacitor, minimum 10uF, X5R or X7R or better dielectric. Note when operating in Min Off mode, higher output capacitance may needed to reduce output ripple when VIN approaches VOUT. The FB components provide output voltage sensing and feedback compensation to regulate the output. The output voltage is programmed using two resistor along with a compensation capacitor. Applications Information (continued) R top To FB pin R bot V O U T C topTo FB pin The FB regulation setpoint is 800mV. The output voltage can be calculated as shown. § u 5ERW 5WRS9287 The FB resistor values can be calculated as shown. It is recommended to use 100kΩ for Rbot to minimize power loss in the FB network. 5ERW9 92875WRS u The optimum value for Ctop is 22pF.

An optimum layout for the SC21152 is shown below. When doing the PCB layout the following guidelines should be used: The input capacitor must be located as close as possible to the IC and directly connected to pin 1 (VIN), pin 5 (GND), and PAD (GND). The LX trace from pin 6 to the inductor should be as short as possible, and wide to reduce IR loss and improve heat dissipation. PCB Layout - Adjustable VOUT The output capacitor should be close to the inductor. The feedback components (Rtop, Ctop, Rbot, for adjustable VOUT) should be located as close as possible to the FB pin. For fixed VOUT, the output capacitor connects directly to the FB pin. The FB trace should be short and not routed near noise signals. Do not route the FB trace under the inductor; the high impedance of the FB circuit can pick up noise from the inductor’s magnetic field. CIN L1COUT VOUT VIN SC21152 GND GND LX FB PG EN VOUT sense trace CIN L1COUT VOUT VIN SC21152 Rbot Rtop Ctop GND GND LX FB PG EN VOUT sense trace PCB Layout - Fixed VOUT

Outline Drawing — 1.5 x 2mm 6-lead MLPD

Land Pattern — 1.5x2mm 6-lead MLPD

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