Datasheet

LM3243
SNVS782B –OCTOBER 2010–REVISED FEBRUARY 2013 www.ti.com
SYSTEM CHARACTERISTICS (continued)
The following spec table entries are specified by design and verifications providing the component values in the Typical
Application Circuit are used (L = 1.5 µH, DCR = 120 mΩ, TOKO DFE201610C-1R5N, C
IN
= 10 µF, 6.3V, 0402, Samsung
CL05A106MQ5NUN, C
OUT
= 10 µF + 4.7 µF + 3 x 1.0 µF + 3300 pF: 6.3V, 0402, Samsung CL05A106MQ5NUN,
CL05A475MQNRN; 6.3V, 0201 Samsung CL03A105MQ3CSN; 6.3V, 01005 Murata GRM022R60J332K). These parameters
are not verified by production testing. Min and Max values are specified over the ambient temperature range T
A
= −30°C
to 90°C. Typical values are specified at PVIN = VDD = EN = 3.8V, BP = 0V and T
A
= 25°C unless otherwise stated.
Symbol Parameter Conditions Min Typ Max Units
V
IN
= 3.8V, V
OUT
= 1.8V,
I
OUT
= 10 mA 79 82
MODE = HIGH (PFM)
V
IN
= 3.8V, V
OUT
= 0.5V,
I
OUT
= 5 mA 58 60
MODE = HIGH (PFM)
V
IN
= 3.8V, V
OUT
= 3.5V,
I
OUT
= 1900 mA 89 92
MODE = LOW (PWM)
η Efficiency %
V
IN
= 3.8V, V
OUT
= 2.5V,
I
OUT
= 250 mA 90 93
MODE = LOW (PWM)
V
IN
= 3.8V, V
OUT
= 1.6V,
I
OUT
= 130 mA 83 86
MODE = LOW (PWM)
V
IN
= 3.8V, V
OUT
= 1.0V,
I
OUT
= 400 mA 81 84
MODE = LOW (PWM)
V
IN
= 0.4V to 3.6V, V
OUT
= 0.4V to
Ripple voltage at no pulse
3.6V, R
OUT
= 1.9Ω
(3)
1 3
skipping condition
MODE = LOW
Ripple voltage at pulse V
IN
= 5.5V to dropout, V
OUT
= 3.6V,
8
skipping condition R
OUT
= 1.9Ω
(3)
V
RIPPLE
mVpp
V
IN
= 3.2V, V
OUT
< 1.125V,
50
I
OUT
=10 mA, MODE = HIGH
PFM Ripple Voltage
V
IN
= 3.2V, V
OUT
≤ 0.5V,
50
I
OUT
= 5mA, MODE = HIGH
V
IN
= 3.6V to 4.2V, T
R
= T
F
= 10 µs,
Line_tr Line transient response V
OUT
= 1V, I
OUT
= 600 mA 50 mVpk
MODE = LOW
V
OUT
= 3.0V, T
R
= T
F
= 10 µs,
Load_tr Load transient response I
OUT
= 0A to 1.2A 40 mVpk
MODE = LOW
Max Duty cycle Maximum duty cycle MODE = LOW 100 %
V
IN
= 3.2V, V
OUT
= 1.0V, I
OUT
= 10
mA 100 160
MODE = HIGH
PFM_Freq Minimum PFM Frequency kHz
V
IN
= 3.2V, V
OUT
= 0.5V, I
OUT
= 5mA
34 55
MODE = HIGH
(3) Ripple voltage should be measured at C
OUT
electrode on a well-designed PC board and using the suggested inductor and capacitors.
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