LMZ36002_15 Datasheet, PDF (15/33 Pages) Texas Instruments – SIMPLE SWITCHER® 4.5-V to 60-V Input, 2-A Power Module in QFN Package

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LMZ36002
SNVSA92A – SEPTEMBER 2015 – REVISED SEPTEMBER 2015
7.3.4 Synchronization (CLK)
The LMZ36002 switching frequency can also be synchronized to an external clock from 200 kHz to 1 MHz. Not
all PV_IN, V_OUT, and I_OUT conditions can be set to all of the frequencies in this range. See Recommended
Operating Range for the allowable operating ranges.
To implement the synchronization feature, connect a clock signal to the CLK pin with a duty cycle between 10%
and 90%. The clock signal amplitude must transition lower than 0.4 V and higher than 2.0 V. The start of the
switching cycle is synchronized to the rising edge of CLK pin. Before the external clock is present the device
operates in RT mode and the switching frequency is set by R_RT resistor. Select R_RT to set the frequency close to
the external synchronization frequency. When the external clock is present, the CLK mode overrides the RT
mode. If the external clock is removed or fails at logic high or low, the LMZ36002 will switch at the frequency
programmed by the R_RT resistor after a time-out period. Connect the CLK pin (pin 8) to AGND if not used.
7.3.5 Output Capacitor Selection
The minimum required and maximum output capacitance of the LMZ36002 is a function of the output voltage as
shown in Table 6. Additionally, the output voltage will determine the Versa-Comp configuration (see VERSA-
COMP Pin Configurations), which is also included in Table 6. The capacitance values listed in Table 6 are the
specified capacitance values. The effects of DC bias and temperature variation must be considered when using
ceramic capacitance. For ceramic capacitors, package size, voltage rating, and dielectric material will contribute
to differences between the specified value and the actual effective value of the capacitance. C_OUT(min) must be
comprised of ceramic type capacitors. Additional capacitance, not exceeding C_OUT(max), may be ceramic type,
low-ESR polymer type, or a combination of the two. See Table 7 for a preferred list of output capacitors by
vendor.
Table 6. Required Output Capacitance
V_OUT (V)
2.5
3.3
5.0
6.0
7.5
MINIMUM REQUIRED
C_OUT (µF) ^{(1) (2)}
64
64
64
64
100
MAXIMUM C_OUT (µF) ⁽²⁾
350
350
350
200
200
Versa-Comp
Connection
Leave OPEN
Connect to VADJ
Connect to VADJ
Connect to VADJ
Connect to VADJ
(1) Minimum required output capacitance must be comprised of ceramic capacitance.
(2) C_OUT values represent specified capacitance values.
Table 7. Recommended Output Capacitors⁽¹⁾
VENDOR
TDK
Murata
TDK
Murata
TDK
Murata
TDK
Murata
Murata
Kemet
Panasonic
Panasonic
SERIES
X5R
X5R
X5R
X5R
X5R
X5R
X5R
X5R
X5R
X5R
POSCAP
POSCAP
PART NUMBER
C3225X5R1C106K
GRM32ER61C106K
C3225X5R1C226M
GRM32ER61C226K
C3225X5R1A476M
GRM32ER61C476K
C3225X5R0J107M
GRM32ER60J107M
GRM32ER61A107M
C1210C107M4PAC7800
6TPE100MI
6TPF220M9L
CAPACITOR CHARACTERISTICS
WORKING
VOLTAGE (V)
CAPACITANCE ⁽²⁾
(µF)
ESR ⁽³⁾
(mΩ)
16
10
2
16
10
2
16
22
2
16
22
2
10
47
2
16
47
3
6.3
100
2
6.3
100
2
10
100
2
16
100
2
6.3
100
18
6.3
220
9
(1) Capacitor Supplier Verification, RoHS, Lead-free and Material Details
Consult capacitor suppliers regarding availability, material composition, RoHS and lead-free status, and manufacturing process
requirements for any capacitors identified in this table.
(2) Specified capacitance values.
(3) Maximum ESR @ 100kHz, 25°C.
Copyright © 2015, Texas Instruments Incorporated
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