AS1335 Datasheet, PDF (1/18 Pages) ams AG – 1.5A, 1.5MHz, Synchronous DC/DC Step-Down Converter

Datasheet
AS1335
1.5A, 1.5MHz, Synchronous DC/DC Step-Down Converter
1 General Description
The AS1335 is a high-efficiency, constant-frequency
synchronous buck converter available in a fixed or an
adjustable output voltage version. The wide input volt-
age range (2.6V to 5.25V), the high output current (up to
1.5A) and minimal external component requirements
make the AS1335 perfect for any single Li-Ion battery-
powered application.
Typical supply current with no load is 400µA and
decreases to ≤1µA in shutdown mode. The highly effi-
cient duty cycle (100%) provides low dropout operation,
prolonging battery life in portable systems.
The device also offers a power-ok signal with a 215ms
delay, which can be reseted or delayed further via the
RSI pin.
An internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. The
internally fixed switching frequency (1.5MHz) allows for
the use of small surface mount external components.
The AS1335 is available in a 10-pin TDFN 3x3mm pack-
age.
2 Key Features
! High Efficiency: Up to 96%
! Output Current: 1.5A
! Input Voltage Range: 2.6V to 5.25V
! Output Voltage Range: 0.6V to VIN
! Constant Frequency Operation: 1.5MHz
! No Schottky Diode Required
! Power OK with 215ms delay
! Low Dropout Operation: 100% Duty Cycle
! Low Quiescent Supply Current: 400µA
! Shutdown Mode Supply Current: ≤1µA
! Current Mode Operation for Excellent Line/Load
Transient Response
! Thermal Protection
! 10-pin TDFN 3x3mm Package
Figure 1. AS1335 - Typical Application Diagram
3 Applications
The device is ideal for mobile communication devices,
laptops and PDAs, ultra-low-power systems, threshold
detectors/discriminators, telemetry and remote systems,
medical instruments, or any other space-limited applica-
tion with low power-consumption requirements.
VIN
2.6V to 5.25V
CIN
22µF
VIN
NC
EN
POK
GND
AS1335
2.2µH
SW
PGND
GND
FB
RSI
COUT
22µF
VOUT
1.0V, 1.5A
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