TPS62730_12 Datasheet, PDF (4/28 Pages) Texas Instruments – Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications

TPS62732, TPS62733
TPS62730
SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
V_IN = 3.0V, V_OUT = 2.1V, ON/BYP = V_IN, T_A = –40°C to 85°C typical values are at T_A = 25°C (unless otherwise noted), C_IN =
2.2μF, L = 2.2μH, C_OUT = 2.2μF, see parameter measurement information
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
STAT Status Output (Open Drain)
V_TSTAT Threshold level for STAT OUTPUT in % from V_OUT
ON/BYP = high and regulator is ready, V_IN
falling
ON/BYP = high and regulator is ready, V_IN
rising ⁽²⁾
95
%
98
V_OL
Output Low Voltage
V_OH
Output High Voltage
I_LKG
Leakage into STAT pin
REGULATOR
Current into STAT pin I = 500μA, V_IN = 2.3V
Open drain output, external pull up resistor
ON/BYP = GND, V_IN = V_OUT = 3V
0.4
V
V_IN
0 50 nA
t_ONmin
t_OFFmin
t_Start
Minimum ON time
Minimum OFF time
Regulator start up time from transition ON/BYP = high
to STAT = low
V_IN = 3.0V, V_OUT = 2.1V, I_OUT = 0 mA
V_IN = 2.3V
V_IN = 3.0V, V_OUT = 3.0V
180
ns
50
ns
50
μs
OUTPUT
V_REF
V_VOUT
Internal Reference Voltage
VOUT Feedback Voltage Comparator Threshold
Accuracy
DC output voltage load regulation
V_IN = 3.0V
T_A = 25°C
T_A = –40°C to 85°C
I_OUT = 1mA to 50mA V_IN = 3.0V, V_OUT = 2.1
V
0.70
–1.5
0
–2.5
0
-0.01
V
1.5 %
2.5
%/mA
DC output voltage line regulation
I_{LK_SW} Leakage current into SW pin
I_OUT = 20 mA, 2.4V ≤ V_IN ≤ 3.9V
V_IN = V_OUT = V_SW = 3.0 V, ON/Byp= GND
(3)
0.01
%/V
0.0 100 nA
(2) The STAT output comparator is enabled once the rising input voltage exceeds the minimum input voltage V_IN min of 1.9V. In case of the
1.9V output voltage option, the STAT output is active once the rising input voltage V_IN exceeds 1.9V.
(3) The internal resistor divider network is disconnected from VOUT pin.
STAT
VOUT
ON/BYP
PIN
NAME
NO
VIN
3
GND
4
ON/BYP
5
SW
2
VOUT
6
PIN FUNCTIONS
I/O
DESCRIPTION
PWR
PWR
IN
OUT
IN
V_IN power supply pin. Connect this pin close to the VIN terminal of the input capacitor. A ceramic capacitor
of 2.2µF is required.
GND supply pin. Connect this pin close to the GND terminal of the input and output capacitor.
This is the mode selection pin of the device. Pulling this pin to low forces the device into ultra low power
bypass mode. The output of the DC/DC converter is connected to VIN via an internal bypass switch.
Pulling this pin to high enables the DC/DC converter operation. This pin must be terminated and is
controlled by the system. In case of CC2540, connect this to the power down signal which is output on one
of the P1.x ports (see CC2540 user guide).
This is the switch pin and is connected to the internal MOSFET switches. Connect the inductor to this
terminal.
Feedback Pin for the internal feedback divider network and regulation loop. The internal bypass switch is
connected between this pin and VIN. Connect this pin directly to the output capacitor with short trace.
4
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