SC196A 1.5A Synchronous Buck Converter with Integrated Power Devices POWER MANAGEMENT Description Features The SC196A is a synchronous step-down converter with Up to 93% ef ciency integrated power devices. The SC196A is designed for 1.00V/1.05V/1.20V/1.80V selectable output voltage single-cell Li-Ion battery applications but can also be used Output current 1.5A in xed 3.3V or 5V applications. The switching frequency Quiescent current 17A is nominally set to 1MHz, allowing the use of small Input range 2.7V to 5.5V inductors and capacitors. The maximum current rating of Dynamic voltage positioning capability the internal MOSFET switches allows a DC output current Fixed 1MHz frequency or 750kHz to 1.25MHz of 1.5A. synchronized operation PSAVE operation to maximize ef ciency at light loads Minimal external components Four programable output voltages 1.00V/1.05V/1.20V/ Fast transient response 1.80V are available. See SC196 with external feedback 100% duty cycle in dropout for other output voltage settings. Soft-start Over-temperature and short-circuit protection The SC196A has a exible clocking methodology that Space-saving lead-free package MLP-10, 3 x 3mm allows it to be synchronized to an external oscillator or controlled by the internal oscillator. The device can operate in either forced PWM mode or in PSAVE mode. If Applications PSAVE mode is enabled, the part will automatically enter PFM at light loads to maintain maximum ef ciency across Cell phones the full load range. Wireless communication chipset power Personal media player For noise sensitive applications, PSAVE mode can be Notebook and sub-notebook computers PDAs and mobile communicators disabled by synchronizing to an external oscillator or WLAN peripherals pulling the SYNC/PWM pin high. Shutdown turns off all the control circuitry to achieve a typical shutdown current of 0.1 A. Typical Application Circuit L1 SC196A V OUT VIN LX V 1.05V IN EN 4.7 H 2.7V to 5.5V 1.5A SYNC/PWM VOUT C C IN OUT VID0 VID1 PGND 10 F 10 F MODE GND July 14, 2008 www.semtech.com 1SC196A PRELIMINARY POWER MANAGEMENT Absolute Maximum Ratings 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 (SYNC/PWM, EN, MODE, VID0, VID1) Output Voltage V -0.3 to V +0.3, 7V Max V OUT IN LX Voltage V -1 to V +1, -2V(100ns Max),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 -60 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 Note: (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, EN = V , SYNC/PWM = V , MODE = V , T = -40 to 85C. Typical values are at T = 25C. IN IN IN IN A A Parameter Symbol Conditions Min Typ Max Units Input Voltage Range V 2.7 5.5 V IN VOUT Accuracy V I = 0.75A, T = 25C 1 % OUT OUT A VOUT Temperature Accuracy V I = 0.75A, T = -40 to 85C 0.3 0.7 % OUT(T) OUT A V = 2.7V to 5.5V, V = 1.8V, IN OUT Line Regulation V 0.4 0.65 % OUT LINE I = 0.75A, T = -40 to 85C OUT A Load Regulation (PWM) V I = 0A to 1.5A, T = -40 to 85C 0.3 0.65 % OUT LOAD OUT A +1.3 +1.6 PSAVE Regulation V SYNC/PWM =GND, C =22 F % OUT PSAVE OUT -0.3 -0.6 P-Channel On Resistance R I = 100mA 0.275 DSP LX N-Channel On Resistance R I = 100mA 0.165 DSN LX Start-Up Time T 5ms START P-Channel Current Limit I 1.9 2.63 A LIM(P) 2008 Semtech Corp. www.semtech.com 2