SC196 1.5A Synchronous Buck Converter with Integrated Power Devices POWER MANAGEMENT Description Features The SC196 is a synchronous step-down converter with Up to 95% ef ciency integrated power devices designed for use in applications V adjustable from less than 0.8V to V OUT IN using a single-cell Li-ion battery. Its wide input voltage Output current 1.5A range also makes it suitable for use in systems with xed Input range 2.5V to 5.5V 3.3V or 5V supply rails available. The switching frequency is Quiescent current 17A nominally set to 1MHz, allowing the use of small inductors Fixed 1MHz frequency or 750kHz to 1.25MHz and capacitors. The current rating of the internal MOSFET synchronized operation switches allows a DC output current of 1.5A. PSAVE operation to maximize ef ciency at light loads Shutdown current <1A The output voltage is set by connecting a resistor divider Fast transient response from the lter inductor to the feedback pin. See the 100% duty cycle in dropout SC196A for pin-programmable output voltages. Soft-start Over-temperature and short-circuit protection The SC196 has a exible clocking methodology that Lead-free package MLPD10-UT, 3 x 3 x 0.6 mm allows it to be synchronized to an external oscillator or controlled by the internal oscillator. The device operates in either forced PWM mode or in PSAVE mode. If PSAVE Applications mode is enabled, the part will automatically enter PFM at Cell phones light loads to maintain maximum ef ciency across the full Wireless communication chipset power load range. Personal media players Microprocessor/DSP core/IO power For noise sensitive applications, PSAVE mode can be PDAs and handheld computers disabled by synchronizing to an external oscillator or WLAN peripherals pulling the SYNC/PWM pin high. Shutdown turns off all USB powered modems the control circuitry to achieve a typical shutdown current 1 Li-Ion or 3 NiMH/NiCd powered devices of 0.1 A. Typical Application Circuit V OUT L1 V IN <0.8V to V IN 4.7 H 2.5V to 5.5V 1.5A SC196 VIN LX C FB1 VOUT C PVIN IN R 10pF FB1 10 F MODE ADJ C OUT R FB2 EN 22 F SYNC/PWM PGND GND February 8, 2007 www.semtech.com 1SC196 POWER MANAGEMENT PRELIMINARY Absolute Maximum Rating Exceeding the speci cations below may result in permanent damage to the device or device malfunction. Operation outside of the parameters speci ed in the Electrical Characteristics section is not recommended. Parameter Symbol Maximum Units Input Supply Voltage V -0.3 to 7 V IN Logic Inputs V -0.3 to V +0.3, 7V Max V N IN (N=SYNC/PWM, EN, MODE) Output Voltage V -0.3 to V +0.3, 7V Max V OUT IN ADJ Input V -0.3 to V +0.3, 7V Max V ADJ IN LX Voltage V -1 to V +1, 7V Max V LX IN (1) Thermal Impedance Junction to Ambient 40 C/W JA VOUT Short-Circuit to GND t Continuous s SC Operating Ambient Temperature Range T -40 to +85 C A Storage Temperature T -65 to +150 C S Junction Temperature T -40 to +150 C J Peak IR Re ow Temperature T 260 C PKG (2) ESD Protection Level V 2kV ESD Notes: (1) Calculated from package in still air, mounted to 3 x 4.5, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. (2) Tested according to JEDEC standard JESD22-A114-B. Electrical Characteristics Unless otherwise noted: V = 3.6V, V = 1.8V, EN = V , SYNC/PWM = V , MODE = V , T = -40 to 85C. Typical values are at T = 25C. IN OUT IN IN IN A A Parameter Symbol Conditions Min Typ Max Units Input Voltage Range V 2.5 5.5 V IN UVLO Threshold (upper) V 2.18 2.3 2.45 V UVL UVLO Hysteresis V 150 mV UVLHYS Output Voltage Range V 0.8 V V OUT IN FB Voltage Tolerance V V = 2.5V to 5.5V, I = 0mA to 1.5A 0.485 0.5 0.515 V FB IN OUT Load Regulation (PWM) V I = 0mA to 1.5A 0.5 1 % OUT LOAD OUT SYNC/PWM=GND,C = 22 F, OUT PSAVE Regulation V 2 3 % OUT PSAVE V = 2.5V to 5.5V, I = 0mA to 1.5A IN OUT P-Channel Current Limit I V =2.5V to 5.5V 1.96 2.8 3.57 A LIM(P) IN SYNC/PWM = GND, I = 0A, OUT Quiescent Current I 17 28 A Q V = 1.04 x V OUT OUT(Programmed) Shutdown Current I EN = GND, LX = OPEN 0.1 1 A SD 2007 Semtech Corp. www.semtech.com 2