Voltage Regulators AN8016NSH Single-channel 1.8-volt step-up DC-DC converter control IC n Overview Unit: mm The AN8016NSH is a single-channel PWM DC-DC converter control IC that supports low-voltage operation. 1 10 This IC allows a stepped-up voltage output to be pro- vided with a minimal number of external components. It 5 6 features a low minimum operating voltage of 1.8 V, and due to being provided in a 10-pin surface mount package with a 0.5 mm lead pitch, is optimal for use in miniature high-efficiency power supplies for portable equipment. 0.5 0.2 n Features 4.3 0.30 Wide operating supply voltage range: 1.8 V to 14 V 6.3 0.30 High-precision reference voltage circuit: 1.27 V (allow- ance: 3%) SSOP010-P-0225 Supports control over a wide output frequency range: 20 kHz to 1 MHz Provides a fixed output current with minimal supply voltage fluctuations by using an external resistor to set the output current with a totem pole structure in the output block. Large maximum output current of 50 mA Timer latch short-circuit protection circuit (charge current: 1.3 m A typical) Low input voltage malfunction prevention circuit (U.V.L.O.) (circuit operation start voltage: 1.6 V typical) On/off control function (active-high, standby current: 5 m A maximum) Fixed maximum duty ratio with small sample-to-sample variations (80% 5%) Adjustable soft start time provided by using separate DTC and S.C.P. pins. Adopts a 0.5 mm lead pitch 10 pin SO flat package (SSONF-10D) Adopts techniques for reducing noise, increasing the light load efficiency, and suppressing the maximum base current when turning on the npn transistor used as the external switching element. n Applications LCD displays, digital still cameras, PDAs 1 0.1 0.1 0.5 +0.1 0.15 0.05 0.625 0.10 0.625 0.10 0.2 0.1 1.5 0.2 3.0 0.30AN8016NSH Voltage Regulators n Block Diagram Active-high 0.7 V 4 Reference On/off Triangular wave Off voltage supply V CC control generator 0.2 V 1.27 V 8 10 RB SS pin FB U.V.L.O. PWM Error amp. 1 IN- 6 Out V CC 1.27 V 0.6 V Latch 1 m A R Low level detector Q comp. Low level S 30 kW V CC clamp High level detector comp. 5 m A 0.23 V 1.27 V Unlatch comp. Low level clamp 7 GND 0.23 V S.C.P. 1.27 V comp. n Pin Descriptions Pin No. Symbol Description 1IN- Error amplifier inverting input 2 S.C.P. Time constant capacitor connection for short-circuit protection 3 SS Soft-start time-constant capacitor connection 4 Off On/off control 5V Supply voltage CC 6 Out Push-pull output 7 GND Ground 8 RB Output-current setting resistor connection pin 9 OSC Oscillator circuit timing resistor/capacitor connection pin 10 FB Error amplifier output 3 2 5 S.C.P. V CC 9 OSC 3 SS