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LT1308ACS8#TRPBF

1-10V 1A boost DC/DC, 600kHz, 2A switch, 100uA Iq, Burst Mode, SOIC-8, Li-Ion to 5V

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Manufacturer Part：

LT1308ACS8#TRPBF

Package：

SOIC-8 Narrow (4.90 x 3.91 x 1.50 mm)

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Description

Product Overview

The LT1308ACS8#TRPBF from Analog Devices (Linear Technology) is a single-cell, high-current, micropower 600kHz boost DC/DC converter. It delivers 5V at 1A from a single Li-Ion cell or 3.3V at 300mA from a single NiCd cell, operating from inputs as low as 1V in an 8-lead SOIC package.

Key Specifications

Topology Boost (Step-Up)
Input Voltage 1.0 V to 10 V
Output Current 1 A (5V from Li-Ion)
Switch Current Limit 2 A
Switch VCESAT 300 mV @ 2A
Switching Frequency 600 kHz (fixed)
Quiescent Current 100 uA (no load)
Shutdown Current <5 uA
Reference Voltage 1.22 V (feedback)
Low-Battery Detector 200 mV reference
Control Mode Current Mode PWM
Burst Mode Automatic at light load
Operating Temperature 0°C to +70°C (C grade)
Package SOIC-8 (Narrow)

Features

  • Operates from inputs as low as 1V for single-cell battery applications
  • 5V at 1A from a single Li-Ion cell with automatic Burst Mode at light load
  • Low 300mV switch saturation at 2A for high efficiency boost conversion
  • 600kHz fixed frequency enables small external inductors and capacitors
  • Low-battery detector with 200mV reference for battery monitoring

Applications

  • GSM/CDMA phone and digital camera boost power from single Li-Ion cell
  • GPS receiver and handheld computer 3.3V/5V power supply
  • Battery backup supplies and DECT phone boost converters

The LT1308ACS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency boost DC/DC converter that operates from an input voltage as low as 1V. The device is capable of delivering 5V at 1A from a single Li-Ion cell or 3.3V at 300mA from a single NiCd cell. The current-mode PWM architecture provides fast transient response and low output ripple. At light loads, automatic Burst Mode operation reduces the effective switching frequency, maintaining high efficiency across the 1mA to 1A load range. The internal NPN power switch handles 2A with only 300mV saturation voltage. A low-battery detector with 200mV reference provides battery monitoring capability. The shutdown pin reduces quiescent current to less than 5uA. The CS8 suffix denotes commercial temperature grade (0-70C) in 8-lead SOIC. The #TRPBF suffix indicates tape and reel packaging with lead-free finish. Note: LT1308 is not recommended for new designs; LT1308A/B are recommended replacements.

The LT1308ACS8#TRPBF uses a current-mode boost converter topology. (1) Boost Operation: The internal NPN power switch connects the inductor to ground during the on-time, causing inductor current to ramp up. When the switch turns off, the inductor voltage reverses and the current flows through the external Schottky diode to the output capacitor and load. The output voltage is higher than the input voltage by the ratio VOUT = VIN / (1-D), where D is the duty cycle. (2) Current-Mode Control: The error amplifier compares the FB pin voltage with the 1.22V internal reference. The error amplifier output (VC pin) sets the peak switch current for each cycle. When the peak current is reached, the switch turns off. This provides cycle-by-cycle current limiting and fast transient response. (3) Burst Mode: At light loads, the LT1308 automatically enters Burst Mode, where the converter delivers energy in bursts separated by idle periods. This reduces effective switching frequency and eliminates switching losses during idle, maintaining high efficiency at light loads. (4) Low-Battery Detector: The LBI pin is compared with a 200mV internal reference. When LBI drops below 200mV, the LBO open-collector output goes low, indicating a low battery condition.

Pin Name Function
1 VC Error amp compensation (47k + 100pF to GND)
2 FB Feedback input (VREF = 1.22V)
3 SHDN Shutdown (GND = off, >1V = on)
4 GND Ground
5 SW Switch output (to inductor/diode)
6 VIN Input supply (1-10V)
7 LBI Low-battery detector input (200mV ref)
8 LBO Low-battery detector output (open collector)
  • Single Li-Ion to 5V/1A boost for GSM phones and digital cameras
  • GPS and handheld computer 3.3V/5V supply from 1-2 cell batteries
  • DECT phone and battery backup boost converters with low-battery detect
Manufacturer Part Number Package Notes
ADI LT1308ACS8-#TRPBF SOIC-8 Burst Mode, improved (recommended)
ADI LT1308BCS8#TRPBF SOIC-8 No Burst Mode, continuous switching
TI TPS61030RSAR QFN-10 1A boost, 1.8-5.5V input
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