Datasheet

LM3208
SNVS404B –APRIL 2006–REVISED MARCH 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
(1)(2)(3)
Limits in standard typeface are for T
A
= T
J
= 25°C. Limits in boldface type apply over the full operating ambient temperature
range (−30°C ≤ T
A
= T
J
≤ +85°C). Unless otherwise noted, all specifications apply to the LM3208 with: PV
IN
= V
DD
= EN =
3.6V.
Symbol Parameter Conditions Min Typ Max Units
V
FB, MIN
Feedback Voltage at minimum V
CON
= 0.32V
(3)
0.75 0.80 0.85 V
setting
V
FB, MAX
Feedback Voltage at maximum V
CON
= 1.44V, V
IN
= 4.2V
(3)
3.537 3.600 3.683 V
setting
I
SHDN
Shutdown supply current EN = SW = V
CON
= 0V,
(4)
0.01 2 µA
I
Q
DC bias current into V
DD
V
CON
= 0V, FB = 0V,
0.6 0.7 mA
No Switching
(5)
R
DSON(P)
Pin-pin resistance for Large PFET I
SW
= 200mA, V
CON
= 0.5V 180
140 mΩ
210
R
DSON(P)
Pin-pin resistance for Small PFET I
SW
= 200mA, V
CON
= 0.32V 960 mΩ
R
DSON(N)
Pin-pin resistance for NFET I
SW
= –200mA, V
CON
= 0.5V 375
300 mΩ
450
I
LIM
Large PFET (L) Switch peak current V
CON
= 0.5V
(6)
985 1100 1200 mA
(L_PFET) limit
I
LIM
Small PFET (S) Switch peak current V
CON
= 0.32V
(6)
650 800 900 mA
(S_PFET) limit
F
OSC
Internal oscillator frequency 1.8 2.0 2.2 MHz
V
IH,EN
Logic high input threshold 1.2 V
V
IL,EN
Logic low input threshold 0.5 V
I
PIN,EN
EN pin pull down current 5 10 µA
V
CON,ON
V
CON
Threshold for turning on
0.15 V
switches
I
CON
V
CON
pin leakage current V
CON
= 1.0V ±1 µA
Gain V
CON
to V
OUT
Gain 0.32V ≤ V
CON
≤ 1.44V 2.5 V/V
(1) All voltages are with respect to the potential at the GND pins. The LM3208 is designed for mobile phone applications where turn-on after
power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal
Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin low until the input voltage exceeds
2.7V.
(2) Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not specified, but do represent the most
likely norm. Due to the pulsed nature of the testing T
A
= T
J
for the electrical characteristics table.
(3) The parameters in the electrical characteristics table are tested under open loop conditions at PV
IN
= V
DD
= 3.6V unless otherwise
specified. For performance over the input voltage range and closed-loop results, refer to the datasheet curves.
(4) Shutdown current includes leakage current of PFET.
(5) I
Q
specified here is when the part is not switching. For operating quiescent current at no load, refer to datasheet curves.
(6) Current limit is built-in, fixed, and not adjustable. Electrical Characteristic table reflects open loop data (FB = 0V and current drawn from
SW pin ramped up until cycle by cycle limit is activated). Refer to SYSTEM CHARACTERISTICS table for maximum output current.
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