MP3438GTL-P

MP3438 2A, 16V, High-Efficiency, Fully Integrated, Synchronous Boost Converter DESCRIPTION FEATURES The MP3438 is a highly integrated boost converter with a 1.2MHz fixed frequency and a wide input voltage (V IN) range. The MP3438 starts up from a VIN as low as 2.7V, and can support up to a 2A switching current limit with integrated, low RDS(ON) power MOSFETs. • • • • • • • The MP3438 adopts constant-off-time (COT) control to provide fast transient response. The cycle-by-cycle current limit on the low-side MOSFET (LS-FET) prevents current runaway, and the high-side MOSFET (HS-FET) eliminates the need for an external Schottky diode. The MP3438 supports an automatic pass-through function when VIN exceeds the set output voltage (VOUT-SET). This function supports high efficiency, even when the input exceeds the regulated output. • • • • • • Full protection features include configurable VIN under-voltage lockout (UVLO) and overtemperature protection (OTP). The MP3438 is available in an SOT583 (1.6mmx2.1mm) package. 2.7V to 16V Start-Up Input Voltage (VST) 0.8V to 16V Operating Input Voltage (VIN) Up to 16V Output Voltage (VOUT) 2A Switching Current Limit >91% Efficiency for 3.3V VIN to 12V/0.3A 1.2MHz Fixed Switching Frequency (fSW) Adaptive Constant-Off-Time (COT) Control for Fast Transient Response Power-Save Mode (PSM) under Light Loads Automatic Pass-Through Mode when VIN > Set Output Voltage (VOUT-SET) Internal Soft Start and Compensation Configurable Under-Voltage Lockout (UVLO) and Hysteresis Over-Temperature Protection (OTP) and Over-Voltage Protection (OVP) Available in an SOT583 (1.6mmx2.1mm) Package Optimized Performance with MPS Inductor MPL-AL4020 Series APPLICATIONS • • • • • LCD Bias Supplies ADSLs/DSLs Electronic Cigarettes Instrumentation Equipment Portable Applications All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are trademarks of Monolithic Power Systems, Inc. or its subsidiaries. TYPICAL APPLICATION L1 C4 0.1µF MPL-AL4020-3R3 SW VIN C1 4.7µF On / off EN VOUT 12V 100 VOUT MP3438 VCC GND 95 R1 750kΩ FB C3 1µF Efficiency vs. Load Current BST R2 68kΩ C2 10µF EFFICIENCY (%) VIN 90 85 VIN=3V VIN=3.3V VIN=4.2V VIN=6V VIN=6.6V VIN=8.4V 80 75 70 65 60 1 MP3438 Rev. 1.0 3/23/2022 10 100 1000 LOAD CURRENT (mA) MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 1 MP3438 – 2A, 16V, HIGH-EFFICIENCY SYNCHRONOUS BOOST CONVERTER ORDERING INFORMATION Part Number Package Top Marking MSL Rating MP3438GTL* SOT583 See Below 1 * For Tape & Reel, add suffix -Z (e.g. MP3438GTL-Z). TOP MARKING BRU: Product code Y: Year code LLL: Lot number PACKAGE REFERENCE TOP VIEW BST 1 8 VIN 6 EN 7 VOUT 2 1 SW 3 6 VCC GND 4 5 FB SOT583 MP3438 Rev. 1.0 3/23/2022 MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2022 MPS. All Rights Reserved. 2 MP3438 – 2A, 16V, HIGH-EFFICIENCY SYNCHRONOUS BOOST CONVERTER PIN FUNCTIONS Pin # Name 1 BST 2 VOUT 3 SW 4 5 GND FB 6 VCC 7 EN 8 VIN Description Bootstrap. A capacitor between the BST and SW pins powers the synchronous high-side MOSFET (HS-FET). Output. The VOUT pin is connected to the drain of the HS-FET. VOUT powers VCC when VOUT exceeds VIN, and when VIN is below 3.4V. Converter switch. The SW pin is connected to the drain of the internal low-side MOSFET (LS-FET) and the source of the internal HS-FET. Connect the power inductor to the SW pin. Power ground. Feedback input. Connect a resistor divider from VOUT to the FB pin. Internal bias supply. Decouple the VCC pin with a 1μF ceramic capacitor, placed as close to this pin as possible. When VIN exceeds 3.4V, VCC is powered by VIN. Otherwise, VCC is powered by the greater voltage between VIN and VOUT. If the biased voltage connected to VCC exceeds 3.4V, the regulators from VIN and VOUT are disabled. If EN is high, the VCC regulator starts to operate when VIN exceeds 0.9V. To provide VCC with a sufficient power voltage during VIN start-up, supply the VIN pin with a power source exceeding 2.7V. Chip enable control. Connect the EN pin to VIN for automatic start-up. EN can configure the VIN under-voltage lockout (UVLO) threshold. Do not float the EN pin. It must be externally pulled up or down. Input supply. The VIN pin must be bypassed locally. To provide VCC with a sufficient power voltage during VIN start-up, supply VIN with a power source exceeding 2.7V. ABSOLUTE MAXIMUM RATINGS (1) SW………………………………………………….. ..-0.3V (-2V for