LMZ14202_15 Datasheet, PDF (15/31 Pages) Texas Instruments – SIMPLE SWITCHER 6V to 42V, 2A Power Module in Leaded SMT-TO Package

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VOUT (V)
5
3.3
2.5
1.8
1.5
1.2
0.8
LMZ14202
SNVS648J – JANUARY 2010 – REVISED OCTOBER 2015
Table 1. Component Value Combinations
R_FBT (kΩ)
R_FBB (kΩ)
R_DS(on) (kΩ)
MIN
5.62
100
7.5
3.32
1.07
61.9
2.26
47.5
1.87
1.5
32.4
6
1
1.13
28
4.22
8.45
22.6
0
39.2
24.9
VIN (V)
MAX
42
42
30
25
21
19
18
REF DES
U1
C_IN1
C_IN2
C_O1
C_O2
R_FBT
R_FBB
R_DS(on)
R_ENT
R_ENB
C_FF
C_SS
Table 2. List of Materials
DESCRIPTION
SIMPLE SWITCHER
1 µF, 50 V, X7R
10 µF, 50 V, X7R
1 µF, 50 V, X7R
100 µF, 6.3 V, X7R
3.32 kΩ
1.07 kΩ
61.9 kΩ
68.1 kΩ
11.8 kΩ
22 nF, ±10%, X7R, 16 V
22 nF, ±10%, X7R, 16 V
SIZE
PFM-7
1206
1210
1206
1210
0603
0603
0603
0603
0603
0603
0603
MANUFACTURER
Texas Instruments
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Vishay Dale
Vishay Dale
Vishay Dale
Vishay Dale
Vishay Dale
TDK
TDK
PART NUMBER
LMZ14202TZ
UMK316B7105KL-T
UMK325BJ106MM-T
UMK316B7105KL-T
JMK325BJ107MM-T
CRCW06033K32FKEA
CRCW06031K07FKEA
CRCW060361k9FKEA
CRCW060368k1FKEA
CRCW060311k8FKEA
C1608X7R1H223K
C1608X7R1H223K
8.2.2 Detailed Design Procedure
8.2.2.1 Design Steps for the LMZ14202 Application
The LMZ14202 is fully supported by WEBENCH and offers the following: Component selection, electrical and
thermal simulations as well as the build-it board for a reduction in design time. The following list of steps can be
used to manually design the LMZ14202 application.
1. Select minimum operating V_IN with enable divider resistors
2. Program V_O with divider resistor selection
3. Program turnon time with soft-start capacitor selection
4. Select C_O
5. Select C_IN
6. Set operating frequency with R_DS(on)
7. Determine module dissipation
8. Carefully consider thermal performance required when designing the PCB layout
8.2.2.1.1 Enable Divider, R_ENT and R_ENB Selection
The enable input provides a precise, 1.18-V band-gap rising threshold to allow direct logic drive or connection to
a voltage divider from a higher enable voltage such as V_IN. The enable input also incorporates 90 mV (typical) of
hysteresis resulting in a falling threshold of 1.09 V. The maximum recommended voltage into the EN pin is 6.5 V.
For applications where the midpoint of the enable divider exceeds 6.5 V, a small Zener diode can be added to
limit this voltage.
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