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PDF AS1346-49 Data sheet ( Hoja de datos )
| Número de pieza | AS1346-49 | |
| Descripción | Dual Step-Down Converter | |
| Fabricantes | ams | |
| Logotipo |  |
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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
EN2
POK Function
LBO
LBI AGND
PGND
www.ams.com/DC-DC_Step-Down
Revision 1.10
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1 page  
AS1346-49
Datasheet - Electrical Characteristics
Table 4. Electrical Characteristics
Symbol
Parameter
RDSON2(P)
Pin-Pin Resistance for PMOS2
RDSON2(N)
Enable
Pin-Pin Resistance for NMOS2
VIH,EN
Logic high input threshold
VIH,EN
Logic low input threshold
Low Battery & Power-OK
VLBI LBI Threshold
LBI Hysteresis
LBI Leakage Current
LBO Voltage Low2
LBO Leakage Current
Power-OK Threshold
Conditions
VDD = 5.0V, ISW = 200mA
VDD = 5.0V, ISW = 200mA
Falling Edge
LBI = 5V, TA = 25°C
ILBO = 0.1mA
LBO = 5V, TA = 25°C
LBI = 0V, Falling Edge
Min Typ Max Units
150 m
250 m
1.2 V
0.5V V
1.16 1.2 1.24
V
10 mV
1 nA
0.05 V
1 nA
85 88 90 %
1. The dynamic supply current is higher due to the gate charge delivered at the switching frequency. The Quiescent Current is measured
while the DC-DC Converter is not switching.
2. LBO goes low in startup mode as well as during normal operation if,
1) The voltage at the LBI pin is higher than LBI threshold.
2) The voltage at the LBI pin is below 0.1V (connected to GND) and VOUT1 is below 92.5% of its nominal value.
www.ams.com/DC-DC_Step-Down
Revision 1.10
5 - 16
5 Page 
AS1346-49
Datasheet - Detailed Description
Figure 18. Typical Application Diagram with Adjustable Battery Monitoring
VIN
4.5V to 5.5V
CIN
R1
R2
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
R3
EN2 LBO
LBI AGND
PGND
8.5 Thermal Shutdown
Due to its high-efficiency design, the AS1346 will not dissipate much heat in most applications. However, in applications where the AS1346 is
running at high ambient temperature, uses a low supply voltage, and runs with high duty cycles (such as in dropout) the heat dissipated may
exceed the maximum junction temperature of the device.
As soon as the junction temperature reaches approximately 150ºC the AS1346 goes in thermal shutdown. In this mode the internal PMOS &
NMOS switch are turned off. The device will power up again, as soon as the temperature falls below +140ºC again.
www.ams.com/DC-DC_Step-Down
Revision 1.10
11 - 16
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