Datasheet

VIN
LMR70503
GND
SW
VOUT
VIN
EN
Cin Cout1
D
VOUT
L
FB
VREF
Rb
Rt
Cff
Cout2
Ren2
Ren1
LMR70503
SNVS850A –JUNE 2012–REVISED APRIL 2013 www.ti.com
LMR70503 Typical Application Circuit
LMR70503 Application Circuit Bill of Materials
V
IN
= 2.8 V to 5.5 V, V
OUT
has options of -0.9 V, -1.5 V, -2.5 V, -3.3 V and -5.0 V. Optimized for minimum solution
size.
Table 1. Bill of Materials
Designator Description Case Size Manufacturer Manufacturer P/N
U1 Inverting Buck-Boost 8-bump thin DSBGA Texas Instruments LMR70503TM NOPB
Ceramic 10 µF 10 V X5R
C
IN
0603 TDK C1608X5R1A106M
0603
Ceramic 22 µF 6.3 V X5R
C
OUT1
, C
OUT2
0603 TDK C1608X5R0J226M
0603
CAP CER 10PF 50V 5%
C
ff
0402 Murata GRM1555C1H100JZ01D
NP0 0402
D Schottky 30 V 500 mA SOD882 NXP Semi PMEG3005EL
L 6.8 µH, 0.76 A 362 mΩ 2.0*2.0*1.2mm TDK VLS2012ET-6R8M
RES, 100k ohm, 1%,
R
T
0402 Vishay Dale CRCW0402100KFKED
0.063W, 0402
422 kΩ For Vout = -5.0V 0402 Vishay Dale CRCW0402422KFKED
274 kΩ For Vout = -3.3V 0402 Vishay Dale CRCW0402274KFKED
R
B
(1)
210 kΩ For Vout = -2.5V 0402 Vishay Dale CRCW0402210KFKED
127 kΩ For Vout = -1.5V 0402 Vishay Dale CRCW0402127KFKED
75 kΩ For Vout = -0.9V 0402 Vishay Dale CRCW040275K0FKED
RES, 20k ohm, 5%,
R
EN1
, R
EN2
0402 Vishay Dale CRCW040220K0JNED
0.063W, 0402
(1) R
B
is represented by R1 in Figure 39.
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