Datasheet

APPLICATION INFORMATION
TYPICAL APPLICATION CIRCUIT
L2
EN_DCDC1
VCC
FB_DCDC
2
PGND2
AGND
EN_LDO1
EN_DCDC2
VLDO2
200mA LDO
VLDO2
VLDO3
DCDC1(I/O)
STEP- DOWN
CONVERTER
1 A
VINDCDC1/2
L1
FB_DCDC1
PGND1
DCDC2(core)
STEP- DOWN
CONVERTER
600mA
VLDO1
400mA LDO
VLDO3
200mA LDO
VDCDC1
VIN_LDO1
VIN_LDO2/3
Vbat
2.2 Hm
10 Fm
2.2 Fm
1 Fm
1W
TPS 65053
EN_LDO2
EN_LDO3
FB2
MODE
THRESHOLD
RESET
Reset
Cff
Cff
R 1
R 2
R 3
R 4
R7
R 8
R19
I/Ovoltage
4.7 Fm
R 5
R 6
VLDO1
FB1
Vbat
Vbat
2.8 V
1.8 V
1.6 V
1.3 V
3.3 V
VDCDC1
R 9
R10
Vbat
2.2 Fm
10 Fm
22 Fm
2.2 Hm
Output Voltage Setting
V
OUT
+ V
REF
ǒ
1 )
R1
R2
Ǔ
(4)
R1 + R2
ǒ
V
OUT
V
FB_DCDC1
Ǔ
* R2
(5)
TPS65053
TPS650531
TPS650532
SLVS754C – MARCH 2007 – REVISED SEPTEMBER 2009 ............................................................................................................................................. www.ti.com
The output voltage of the DCDC converters can be set by an external resistor network and can be calculated to:
with an internal reference voltage V
ref
, 0.6 V (typical).
It is recommended to set the total resistance of R1 + R2 to less than 1M Ω . The resistor network connects to the
input of the feedback amplifier; therefore, need some small feedforward capacitor in parallel to R1. A typical
value of 47pF is sufficient.
16 Submit Documentation Feedback Copyright © 2007 – 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS65053 TPS650531 TPS650532