STOD1317BTPUR

STOD1317B 170 mA 13 V, high efficiency boost converter + LDO Datasheet - production data Description DFN12L (3 x 3 mm) Features  Operating input voltage range from 2.6 V to 4.8 V  ±1% output voltage tolerance  Low output ripple  True-shutdown  Short-circuit protection The STOD1317B is a fixed frequency, high efficiency, boost DC-DC converter with cascaded LDO able to provide output voltages ranging from 6 V to 13 V starting with an input voltage from 2.6 V to 4.8 V. The device is designed to supply loads that are very sensitive to output ripple such as AMOLED display panels. A dedicated LDO is able to suppress any ripple and noise coming out from the DC-DC converter. The LDO works with a constant drop in order to maintain high efficiency in the whole operating range. The low RDSon Nchannel and P-channel MOSFET switches are integrated and contribute to achieving high efficiency. The true-shutdown feature allows physical disconnection of the battery from the load when the device is in shutdown mode. The control technique is able to maintain efficiency higher than 85% at light loads and higher than 80% at full load. The device includes soft-start control, inrush current limiter, thermal shutdown and inductor peak current limit. The STOD1317B is packaged in DFN12L (3 x 3 x 0.8 mm) height.  Digital low power function  Very high efficiency at light load thanks to pulse skipping operation  Very fast line and load transients  1.2 MHz switching frequency  1 µA max. quiescent current  DFN12L (3 x 3 x 0.8 mm) Applications  Single rail AMOLED display  Cellular phones  Battery powered equipment Table 1. Device summary Order code Marking Package Packaging STOD1317BTPUR 1317B DFN12L (3 x 3 mm) 3000 parts per reel April 2013 This is information on a product in full production. DocID022607 Rev 2 1/22 www.st.com 22 Contents STOD1317B Contents 1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1 7 BOOST multiple mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.1.1 Pulse skipping operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1.2 Discontinuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1.3 Continuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.2 Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.3 Soft-start and inrush current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.4 Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.5 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.6 Digital low power function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1 7.2 External passive components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1.1 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1.2 Input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 DocID022607 Rev 2 STOD1317B 1 Schematic Schematic Figure 1. Application schematic Table 2. Typical external components Comp. Manufacturer Part number Value Ratings Size CIN MURATA Taiyo Yuden TDK GRM219R61A106KE44 LMK212BJ106KD-T C1608X5R0J106 10µF ±10%, X5R, 10V ±10%, X5R, 10V ±10%, X5R, 6.3V 0805 0805 0603 CMID MURATA TDK GRM219R61C475KE15 C2012X5R1C475 4.7µF ±10%, X5R, 16V ±10%, X5R, 16V 0805 0805 COUT MURATA TDK GRM219R61C475KE15 C2012X5R1C475 4.7µF ±10%, X5R, 16V ±10%, X5R, 16V 0805 0805 L (1) CoilCraft TDK DASTEK LPS4012-472ML VLS252012T-4R7MR81 PNL3008-4R7M 4.7µH ±20%, curr. 1.7A, resist. 0.175 ±20%, curr. 1.3A, resist. 0.338 ±20%, curr. 0.9A, resist. 0.280 4.0 x 4.0 x 1.2 2.5 x 2.0 x 1.2 3.1 x 3.1 x 0.8 R1 k 0402 R2 k 0402 1. Inductor used for the typical application conditions. Inductance values ranging from 3.3 µH to 6.8 µH can be used together with the STOD1317B. A minimum saturation current of 1.2 A must be ensured to support 170 mA at 2.6 V in full range. Note: All the above components refer to a typical application. Operation of the device is not limited to the choice of these external components. DocID022607 Rev 2 3/22 Schematic STOD1317B Figure 2. Block schematic LX VMID s SCP s M1 M2 s M3 PGND VOUT GND VO_SET DMD M0 s OTA PGND + FB PWM LOGIC CONTROL & DRIVER OVP SOFT START + RING KILLER OCP VREF EA COMP + - VIN + 4/22 OSC SHUT DOWN NC EN DocID022607 Rev 2 OTP STOD1317B 2 Pin configuration Pin configuration Figure 3. Pin configuration (top view) VMID LX VOUT LX VO_SET PGND AGND GND PGND FB VIN EN NC Table 3. Pin description Pin name Pin number VMID 1 Step-up output voltage VOUT 2 LDO output voltage VO_SET 3 LDO output voltage set GND 4 Analog ground FB 5 Feedback voltage EN 6 Enable pin. Connect this pin to GND or a voltage lower than 0.4V to shut down the IC. A voltage higher than 1.2V is required to enable the IC NC 7 Not connected VIN 8 Supply voltage PGND 9, 10 Power ground LX 11, 12 Switch pin. Inductor connection to the internal switches Exposed PAD Description Internally connected to PGND DocID022607 Rev 2 5/22 Maximum ratings 3 STOD1317B Maximum ratings Table 4. Absolute maximum ratings Symbol Value Unit VIN Supply voltage -0.3 to +7.0 V LX Switching node -0.3 to +16 V 16 V Output voltage -0.3 to +16 V EN Logic pin -0.3 to 4.6 V FB Feedback pin -0.3 to +2.5 V Machine model ±200 V Human body model ±2000 V -40 to 85 °C +150 °C -65 to 150 °C VOUT_SET VOUT ESD TAMB TJ TSTG Note: Parameter LDO output voltage set Operating ambient temperature Maximum operating junction temperature Storage temperature Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Table 5. Thermal data Symbol 6/22 Parameter Value Unit RthJA Thermal resistance junction-ambient 49.1 °C/W RthJC Thermal resistance junction-case (FR-4 PCB) 4.216 °C/W DocID022607 Rev 2 STOD1317B 4 Electrical characteristics Electrical characteristics TJ = 25 °C, VIN = 3.7 V, VOUT = 10 V, CIN = 2 x 10 µF, CMID = 2 x 4.7 µF, COUT = 2 x 4.7 µF, L = 4.7 µH, VEN = 2 V, unless otherwise specified. Table 6. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit 2.6 3.7 4.8 V 0.5 1 µA 1 1.5 mA 2.4 2.5 General section VIN Operating power input voltage range Shutdown mode Shutdown mode, VEN=GND No switching VEN=VIN=3.7V, VFB=1.3V VUVLO Undervoltage lockout threshold VIN rising fSW Switching frequency IPK Switch current limitation Iq VIN falling V 2.1 2.2 1 1.2 1.35 MHz 1.6 2 2.4 A 1.2 1.32 V 1.38 V 10 13 V 30 40 mV 30 mV 16 V 1 µA VOUT + 0.7 V 0.4 V Output voltage (VOUT) Feedback voltage TA=25°C 1.08 ∆VFB Accuracy -40°C