LM3691_15 Datasheet, PDF (1/29 Pages) Texas Instruments – LM3691 High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications

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LM3691
SNVS506J – MAY 2008 – REVISED DECEMBER 2015
LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter
for Portable Applications
1 Features
•1 Input Voltage: 2.3 V to 5.5 V
• Output Voltage: 0.75 V to 3.3 V
• ±1% DC Output Voltage Precision
• 4-MHz Switching Frequency
• 64-μA (typical) Quiescent Current in ECO Mode
• 1-A Maximum Load Capability
• Automatic ECO/PWM Mode Switching
• MODE Pin to Select ECO/Forced PWM Mode
• Current Overload and Thermal Shutdown
Protections
• Only Three Tiny Surface-Mount External
Components Required (Solution Size Less Than
15 mm²)
2 Applications
• Mobile Phones
• Hand-Held Radios
• MP3 Players
• Portable Hard Disk Drives
Typical Application Circuit
V_IN
2.3 V to 5.5 V
CIN
IN _A2
B2
SW
EN _{A1 LM3691 C1} FB
V_OUT
C_OUT
GND _C2
B1 ^MODE
3 Description
The LM3691 step-down DC-DC converter is
optimized for powering ultra-low-voltage circuits from
a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It
provides up to 1-A load current over an input voltage
range from 2.3 V to 5.5 V. There are several different
fixed voltage output options available.
The LM3691 has a mode-control pin that allows the
user to select Forced PWM mode or ECO mode that
changes modes between gated PWM mode and
PWM automatically, depending on the load. In ECO
mode, the device offers superior efficiency and very
low I_Q under light load conditions. ECO mode extends
the battery life through reduction of the quiescent
current during light load conditions and system
standby.
The LM3691 is available in a 6-pin DSBGA package.
Only three external surface-mount components, a
1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF
output capacitor, are required.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3691
DSBGA (6)
1.59 mm × 1.295 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs. Output Current
(V_OUT = 1.8 V, ECO Mode)
100
80
60
V_IN = 2.3V
V_IN = 3.6V
40
V_IN = 4.2V
20
0
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.