AS1346 Datasheet, PDF (1/16 Pages) ams AG – Dual Step-Down Converter with Battery Monitoring

AS1346-49
Dual Step-Down Converter with Battery Monitoring
1 General Description
The AS1346, AS1347, AS1348, AS1349 family is a high-efficiency,
constant-frequency dual buck converter available with fixed voltage
versions. The device provides two independent DC/DC Converters
with output currents between 0.5A and 1.2A. The wide input voltage
range (2.7V to 5.5V), automatic powersave mode and minimal
external component requirements make the AS134x family perfect
for SSD and many other battery-powered applications.
In shutdown mode the typical supply current decreases to ≤1μA.
The highly efficient duty cycle (100%) provides low dropout
operation, prolonging battery life in portable systems.
An internal synchronous switching scheme increases efficiency and
eliminates the need for an external Schottky diode. The fixed
switching frequency (2.0MHz) allows the use of small surface mount
inductors.
The integrated monitoring function can be configured that either the
output voltage (Power Okay function ) or the input voltage (Battery
Monitoring Function) can be supervised.
Table 1. Available Products
Devices
IOUT1
IOUT2
AS1346
1.2A
0.5A
AS1347
0.5A
0.5A
AS1348
0.5A
0.95A
AS1349
1.2A
1.2A
The AS1346-49 is available in a 12-Pin TDFN 3x3mm package.
Figure 1. AS1346 - Typical Application Diagram with POK Function
2 Key Features
High Efficiency: Up to 95%
Output Current: see Table 1
Input Voltage Range: 2.7V to 5.5V
Output Voltage Range: 1.2V to 3.6V (available in 100mV steps)
Constant Frequency Operation: 2.0MHz
180º Out of Phase Operation
Low Battery Detection
Low Dropout Operation: 100% Duty Cycle
Shutdown Mode Supply Current: 1μA
No Schottky Diode Required
Output Disconnect in Shutdown
Non standard variants available within two weeks
12-Pin TDFN 3x3mm Package
3 Applications
The device is ideal for SSD applications, mobile communication
devices, laptops and PDAs, ultra-low-power systems, threshold
detectors/discriminators, telemetry and remote systems, medical
instruments, or any other space-limited application with low power-
consumption requirements.
VIN
2.7V to 5.5V
CIN
PVIN
PVIN
AS1346
VDD
EN1
L1 = 3.3μH
SW1
FB1 _{L2 = 3.3μH}
SW2
FB2
VOUT1
3.3V 1200mA
COUT1
VOUT2
1.8V 500mA
COUT2
POK Function
EN2
LBO
LBI
AGND
PGND
www.ams.com/DC-DC_Step-Down
Revision 1.10
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